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cups/scheduler/client.c

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/*
* Client routines for the CUPS scheduler.
*
* Copyright © 2021-2023 by OpenPrinting.
* Copyright © 2007-2021 by Apple Inc.
* Copyright © 1997-2007 by Easy Software Products, all rights reserved.
*
* This file contains Kerberos support code, copyright 2006 by
* Jelmer Vernooij.
*
* Licensed under Apache License v2.0. See the file "LICENSE" for more
* information.
*/
/*
* Include necessary headers...
*/
#define _CUPS_NO_DEPRECATED
#define _HTTP_NO_PRIVATE
#include "cupsd.h"
#ifdef __APPLE__
# include <libproc.h>
#endif /* __APPLE__ */
#ifdef HAVE_TCPD_H
# include <tcpd.h>
#endif /* HAVE_TCPD_H */
/*
* Local functions...
*/
static int check_if_modified(cupsd_client_t *con,
struct stat *filestats);
static int compare_clients(cupsd_client_t *a, cupsd_client_t *b,
void *data);
#ifdef HAVE_TLS
static int cupsd_start_tls(cupsd_client_t *con, http_encryption_t e);
#endif /* HAVE_TLS */
static char *get_file(cupsd_client_t *con, struct stat *filestats,
char *filename, size_t len);
static http_status_t install_cupsd_conf(cupsd_client_t *con);
static int is_cgi(cupsd_client_t *con, const char *filename,
struct stat *filestats, mime_type_t *type);
static int is_path_absolute(const char *path);
static int pipe_command(cupsd_client_t *con, int infile, int *outfile,
char *command, char *options, int root);
static int valid_host(cupsd_client_t *con);
static int write_file(cupsd_client_t *con, http_status_t code,
char *filename, char *type,
struct stat *filestats);
static void write_pipe(cupsd_client_t *con);
/*
* 'cupsdAcceptClient()' - Accept a new client.
*/
void
cupsdAcceptClient(cupsd_listener_t *lis)/* I - Listener socket */
{
const char *hostname; /* Hostname of client */
char name[256]; /* Hostname of client */
int count; /* Count of connections on a host */
cupsd_client_t *con, /* New client pointer */
*tempcon; /* Temporary client pointer */
socklen_t addrlen; /* Length of address */
http_addr_t temp; /* Temporary address variable */
static time_t last_dos = 0; /* Time of last DoS attack */
#ifdef HAVE_TCPD_H
struct request_info wrap_req; /* TCP wrappers request information */
#endif /* HAVE_TCPD_H */
cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdAcceptClient(lis=%p(%d)) Clients=%d", lis, lis->fd, cupsArrayCount(Clients));
/*
* Make sure we don't have a full set of clients already...
*/
if (cupsArrayCount(Clients) == MaxClients)
return;
cupsdSetBusyState(1);
/*
* Get a pointer to the next available client...
*/
if (!Clients)
Clients = cupsArrayNew(NULL, NULL);
if (!Clients)
{
cupsdLogMessage(CUPSD_LOG_ERROR,
"Unable to allocate memory for clients array!");
cupsdPauseListening();
return;
}
if (!ActiveClients)
ActiveClients = cupsArrayNew((cups_array_func_t)compare_clients, NULL);
if (!ActiveClients)
{
cupsdLogMessage(CUPSD_LOG_ERROR,
"Unable to allocate memory for active clients array!");
cupsdPauseListening();
return;
}
if ((con = calloc(1, sizeof(cupsd_client_t))) == NULL)
{
cupsdLogMessage(CUPSD_LOG_ERROR, "Unable to allocate memory for client!");
cupsdPauseListening();
return;
}
/*
* Accept the client and get the remote address...
*/
con->number = ++ LastClientNumber;
con->file = -1;
if ((con->http = httpAcceptConnection(lis->fd, 0)) == NULL)
{
if (errno == ENFILE || errno == EMFILE)
cupsdPauseListening();
cupsdLogMessage(CUPSD_LOG_ERROR, "Unable to accept client connection - %s.",
strerror(errno));
free(con);
return;
}
/*
* Save the connected address and port number...
*/
addrlen = sizeof(con->clientaddr);
if (getsockname(httpGetFd(con->http), (struct sockaddr *)&con->clientaddr, &addrlen) || addrlen == 0)
con->clientaddr = lis->address;
cupsdLogClient(con, CUPSD_LOG_DEBUG, "Server address is \"%s\".", httpAddrString(&con->clientaddr, name, sizeof(name)));
/*
* Check the number of clients on the same address...
*/
for (count = 0, tempcon = (cupsd_client_t *)cupsArrayFirst(Clients);
tempcon;
tempcon = (cupsd_client_t *)cupsArrayNext(Clients))
if (httpAddrEqual(httpGetAddress(tempcon->http), httpGetAddress(con->http)))
{
count ++;
if (count >= MaxClientsPerHost)
break;
}
if (count >= MaxClientsPerHost)
{
if ((time(NULL) - last_dos) >= 60)
{
last_dos = time(NULL);
cupsdLogMessage(CUPSD_LOG_WARN,
"Possible DoS attack - more than %d clients connecting "
"from %s.",
MaxClientsPerHost,
httpGetHostname(con->http, name, sizeof(name)));
}
httpClose(con->http);
free(con);
return;
}
/*
* Get the hostname or format the IP address as needed...
*/
if (HostNameLookups)
hostname = httpResolveHostname(con->http, NULL, 0);
else
hostname = httpGetHostname(con->http, NULL, 0);
if (hostname == NULL && HostNameLookups == 2)
{
/*
* Can't have an unresolved IP address with double-lookups enabled...
*/
cupsdLogClient(con, CUPSD_LOG_WARN,
"Name lookup failed - closing connection from %s!",
httpGetHostname(con->http, NULL, 0));
httpClose(con->http);
free(con);
return;
}
if (HostNameLookups == 2)
{
/*
* Do double lookups as needed...
*/
http_addrlist_t *addrlist, /* List of addresses */
*addr; /* Current address */
if ((addrlist = httpAddrGetList(hostname, AF_UNSPEC, NULL)) != NULL)
{
/*
* See if the hostname maps to the same IP address...
*/
for (addr = addrlist; addr; addr = addr->next)
if (httpAddrEqual(httpGetAddress(con->http), &(addr->addr)))
break;
}
else
addr = NULL;
httpAddrFreeList(addrlist);
if (!addr)
{
/*
* Can't have a hostname that doesn't resolve to the same IP address
* with double-lookups enabled...
*/
cupsdLogClient(con, CUPSD_LOG_WARN,
"IP lookup failed - closing connection from %s!",
httpGetHostname(con->http, NULL, 0));
httpClose(con->http);
free(con);
return;
}
}
#ifdef HAVE_TCPD_H
/*
* See if the connection is denied by TCP wrappers...
*/
request_init(&wrap_req, RQ_DAEMON, "cupsd", RQ_FILE, httpGetFd(con->http),
NULL);
fromhost(&wrap_req);
if (!hosts_access(&wrap_req))
{
cupsdLogClient(con, CUPSD_LOG_WARN,
"Connection from %s refused by /etc/hosts.allow and "
"/etc/hosts.deny rules.", httpGetHostname(con->http, NULL, 0));
httpClose(con->http);
free(con);
return;
}
#endif /* HAVE_TCPD_H */
#ifdef AF_LOCAL
if (httpAddrFamily(httpGetAddress(con->http)) == AF_LOCAL)
{
# ifdef __APPLE__
socklen_t peersize; /* Size of peer credentials */
pid_t peerpid; /* Peer process ID */
char peername[256]; /* Name of process */
peersize = sizeof(peerpid);
if (!getsockopt(httpGetFd(con->http), SOL_LOCAL, LOCAL_PEERPID, &peerpid,
&peersize))
{
if (!proc_name((int)peerpid, peername, sizeof(peername)))
cupsdLogClient(con, CUPSD_LOG_DEBUG,
"Accepted from %s (Domain ???[%d])",
httpGetHostname(con->http, NULL, 0), (int)peerpid);
else
cupsdLogClient(con, CUPSD_LOG_DEBUG,
"Accepted from %s (Domain %s[%d])",
httpGetHostname(con->http, NULL, 0), peername, (int)peerpid);
}
else
# endif /* __APPLE__ */
cupsdLogClient(con, CUPSD_LOG_DEBUG, "Accepted from %s (Domain)",
httpGetHostname(con->http, NULL, 0));
}
else
#endif /* AF_LOCAL */
cupsdLogClient(con, CUPSD_LOG_DEBUG, "Accepted from %s:%d (IPv%d)",
httpGetHostname(con->http, NULL, 0),
httpAddrPort(httpGetAddress(con->http)),
httpAddrFamily(httpGetAddress(con->http)) == AF_INET ? 4 : 6);
/*
* Get the local address the client connected to...
*/
addrlen = sizeof(temp);
if (getsockname(httpGetFd(con->http), (struct sockaddr *)&temp, &addrlen))
{
cupsdLogClient(con, CUPSD_LOG_ERROR, "Unable to get local address - %s",
strerror(errno));
strlcpy(con->servername, "localhost", sizeof(con->servername));
con->serverport = LocalPort;
}
#ifdef AF_LOCAL
else if (httpAddrFamily(&temp) == AF_LOCAL)
{
strlcpy(con->servername, "localhost", sizeof(con->servername));
con->serverport = LocalPort;
}
#endif /* AF_LOCAL */
else
{
if (httpAddrLocalhost(&temp))
strlcpy(con->servername, "localhost", sizeof(con->servername));
else if (HostNameLookups)
httpAddrLookup(&temp, con->servername, sizeof(con->servername));
else
httpAddrString(&temp, con->servername, sizeof(con->servername));
con->serverport = httpAddrPort(&(lis->address));
}
/*
* Add the connection to the array of active clients...
*/
cupsArrayAdd(Clients, con);
/*
* Add the socket to the server select.
*/
cupsdAddSelect(httpGetFd(con->http), (cupsd_selfunc_t)cupsdReadClient, NULL,
con);
cupsdLogClient(con, CUPSD_LOG_DEBUG, "Waiting for request.");
/*
* Temporarily suspend accept()'s until we lose a client...
*/
if (cupsArrayCount(Clients) == MaxClients)
cupsdPauseListening();
#ifdef HAVE_TLS
/*
* See if we are connecting on a secure port...
*/
if (lis->encryption == HTTP_ENCRYPTION_ALWAYS)
{
/*
* https connection; go secure...
*/
if (cupsd_start_tls(con, HTTP_ENCRYPTION_ALWAYS))
cupsdCloseClient(con);
}
else
con->auto_ssl = 1;
#endif /* HAVE_TLS */
}
/*
* 'cupsdCloseAllClients()' - Close all remote clients immediately.
*/
void
cupsdCloseAllClients(void)
{
cupsd_client_t *con; /* Current client */
cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdCloseAllClients() Clients=%d", cupsArrayCount(Clients));
for (con = (cupsd_client_t *)cupsArrayFirst(Clients);
con;
con = (cupsd_client_t *)cupsArrayNext(Clients))
if (cupsdCloseClient(con))
cupsdCloseClient(con);
}
/*
* 'cupsdCloseClient()' - Close a remote client.
*/
int /* O - 1 if partial close, 0 if fully closed */
cupsdCloseClient(cupsd_client_t *con) /* I - Client to close */
{
int partial; /* Do partial close for SSL? */
cupsdLogClient(con, CUPSD_LOG_DEBUG, "Closing connection.");
/*
* Flush pending writes before closing...
*/
httpFlushWrite(con->http);
partial = 0;
if (con->pipe_pid != 0)
{
/*
* Stop any CGI process...
*/
cupsdEndProcess(con->pipe_pid, 1);
con->pipe_pid = 0;
}
if (con->file >= 0)
{
cupsdRemoveSelect(con->file);
close(con->file);
con->file = -1;
}
/*
* Close the socket and clear the file from the input set for select()...
*/
if (httpGetFd(con->http) >= 0)
{
cupsArrayRemove(ActiveClients, con);
cupsdSetBusyState(0);
#ifdef HAVE_TLS
/*
* Shutdown encryption as needed...
*/
if (httpIsEncrypted(con->http))
partial = 1;
#endif /* HAVE_TLS */
if (partial)
{
/*
* Only do a partial close so that the encrypted client gets everything.
*/
httpShutdown(con->http);
cupsdAddSelect(httpGetFd(con->http), (cupsd_selfunc_t)cupsdReadClient,
NULL, con);
cupsdLogClient(con, CUPSD_LOG_DEBUG, "Waiting for socket close.");
}
else
{
/*
* Shut the socket down fully...
*/
cupsdRemoveSelect(httpGetFd(con->http));
httpClose(con->http);
con->http = NULL;
}
}
if (!partial)
{
/*
* Free memory...
*/
cupsdRemoveSelect(httpGetFd(con->http));
httpClose(con->http);
if (con->filename)
{
unlink(con->filename);
cupsdClearString(&con->filename);
}
cupsdClearString(&con->command);
cupsdClearString(&con->options);
cupsdClearString(&con->query_string);
if (con->request)
{
ippDelete(con->request);
con->request = NULL;
}
if (con->response)
{
ippDelete(con->response);
con->response = NULL;
}
if (con->language)
{
cupsLangFree(con->language);
con->language = NULL;
}
#ifdef HAVE_AUTHORIZATION_H
if (con->authref)
{
AuthorizationFree(con->authref, kAuthorizationFlagDefaults);
con->authref = NULL;
}
#endif /* HAVE_AUTHORIZATION_H */
/*
* Re-enable new client connections if we are going back under the
* limit...
*/
if (cupsArrayCount(Clients) == MaxClients)
cupsdResumeListening();
/*
* Compact the list of clients as necessary...
*/
cupsArrayRemove(Clients, con);
free(con);
}
return (partial);
}
/*
* 'cupsdReadClient()' - Read data from a client.
*/
void
cupsdReadClient(cupsd_client_t *con) /* I - Client to read from */
{
char line[32768], /* Line from client... */
locale[64], /* Locale */
*ptr; /* Pointer into strings */
http_status_t status; /* Transfer status */
ipp_state_t ipp_state; /* State of IPP transfer */
int bytes; /* Number of bytes to POST */
char *filename; /* Name of file for GET/HEAD */
char buf[1024]; /* Buffer for real filename */
struct stat filestats; /* File information */
mime_type_t *type; /* MIME type of file */
static unsigned request_id = 0; /* Request ID for temp files */
status = HTTP_STATUS_CONTINUE;
cupsdLogClient(con, CUPSD_LOG_DEBUG2, "cupsdReadClient: error=%d, used=%d, state=%s, data_encoding=HTTP_ENCODING_%s, data_remaining=" CUPS_LLFMT ", request=%p(%s), file=%d", httpError(con->http), (int)httpGetReady(con->http), httpStateString(httpGetState(con->http)), httpIsChunked(con->http) ? "CHUNKED" : "LENGTH", CUPS_LLCAST httpGetRemaining(con->http), con->request, con->request ? ippStateString(ippGetState(con->request)) : "", con->file);
if (httpError(con->http) == EPIPE && !httpGetReady(con->http) && recv(httpGetFd(con->http), buf, 1, MSG_PEEK) < 1)
{
/*
* Connection closed...
*/
cupsdLogClient(con, CUPSD_LOG_DEBUG, "Closing on EOF.");
cupsdCloseClient(con);
return;
}
if (httpGetState(con->http) == HTTP_STATE_GET_SEND ||
httpGetState(con->http) == HTTP_STATE_POST_SEND ||
httpGetState(con->http) == HTTP_STATE_STATUS)
{
/*
* If we get called in the wrong state, then something went wrong with the
* connection and we need to shut it down...
*/
cupsdLogClient(con, CUPSD_LOG_DEBUG, "Closing on unexpected HTTP read state %s.", httpStateString(httpGetState(con->http)));
cupsdCloseClient(con);
return;
}
#ifdef HAVE_TLS
if (con->auto_ssl)
{
/*
* Automatically check for a SSL/TLS handshake...
*/
con->auto_ssl = 0;
if (recv(httpGetFd(con->http), buf, 1, MSG_PEEK) == 1 &&
(!buf[0] || !strchr("DGHOPT", buf[0])))
{
/*
* Encrypt this connection...
*/
cupsdLogClient(con, CUPSD_LOG_DEBUG2, "Saw first byte %02X, auto-negotiating SSL/TLS session.", buf[0] & 255);
if (cupsd_start_tls(con, HTTP_ENCRYPTION_ALWAYS))
cupsdCloseClient(con);
return;
}
}
#endif /* HAVE_TLS */
switch (httpGetState(con->http))
{
case HTTP_STATE_WAITING :
/*
* See if we've received a request line...
*/
con->operation = httpReadRequest(con->http, con->uri, sizeof(con->uri));
if (con->operation == HTTP_STATE_ERROR ||
con->operation == HTTP_STATE_UNKNOWN_METHOD ||
con->operation == HTTP_STATE_UNKNOWN_VERSION)
{
if (httpError(con->http))
cupsdLogClient(con, CUPSD_LOG_DEBUG,
"HTTP_STATE_WAITING Closing for error %d (%s)",
httpError(con->http), strerror(httpError(con->http)));
else
cupsdLogClient(con, CUPSD_LOG_DEBUG,
"HTTP_STATE_WAITING Closing on error: %s",
cupsLastErrorString());
cupsdCloseClient(con);
return;
}
/*
* Ignore blank request lines...
*/
if (con->operation == HTTP_STATE_WAITING)
break;
/*
* Clear other state variables...
*/
con->bytes = 0;
con->file = -1;
con->file_ready = 0;
con->pipe_pid = 0;
con->username[0] = '\0';
con->password[0] = '\0';
cupsdClearString(&con->command);
cupsdClearString(&con->options);
cupsdClearString(&con->query_string);
if (con->request)
{
ippDelete(con->request);
con->request = NULL;
}
if (con->response)
{
ippDelete(con->response);
con->response = NULL;
}
if (con->language)
{
cupsLangFree(con->language);
con->language = NULL;
}
#ifdef HAVE_GSSAPI
con->have_gss = 0;
con->gss_uid = 0;
#endif /* HAVE_GSSAPI */
/*
* Handle full URLs in the request line...
*/
if (strcmp(con->uri, "*"))
{
char scheme[HTTP_MAX_URI], /* Method/scheme */
userpass[HTTP_MAX_URI], /* Username:password */
hostname[HTTP_MAX_URI], /* Hostname */
resource[HTTP_MAX_URI]; /* Resource path */
int port; /* Port number */
/*
* Separate the URI into its components...
*/
if (httpSeparateURI(HTTP_URI_CODING_MOST, con->uri,
scheme, sizeof(scheme),
userpass, sizeof(userpass),
hostname, sizeof(hostname), &port,
resource, sizeof(resource)) < HTTP_URI_STATUS_OK)
{
cupsdLogClient(con, CUPSD_LOG_ERROR, "Bad URI \"%s\" in request.",
con->uri);
cupsdSendError(con, HTTP_STATUS_METHOD_NOT_ALLOWED, CUPSD_AUTH_NONE);
cupsdCloseClient(con);
return;
}
/*
* Only allow URIs with the servername, localhost, or an IP
* address...
*/
if (strcmp(scheme, "file") &&
_cups_strcasecmp(hostname, ServerName) &&
_cups_strcasecmp(hostname, "localhost") &&
!cupsArrayFind(ServerAlias, hostname) &&
!isdigit(hostname[0]) && hostname[0] != '[')
{
/*
* Nope, we don't do proxies...
*/
cupsdLogClient(con, CUPSD_LOG_ERROR, "Bad URI \"%s\" in request.",
con->uri);
cupsdSendError(con, HTTP_STATUS_METHOD_NOT_ALLOWED, CUPSD_AUTH_NONE);
cupsdCloseClient(con);
return;
}
/*
* Copy the resource portion back into the URI; both resource and
* con->uri are HTTP_MAX_URI bytes in size...
*/
strlcpy(con->uri, resource, sizeof(con->uri));
}
/*
* Process the request...
*/
gettimeofday(&(con->start), NULL);
cupsdLogClient(con, CUPSD_LOG_DEBUG, "%s %s HTTP/%d.%d",
httpStateString(con->operation) + 11, con->uri,
httpGetVersion(con->http) / 100,
httpGetVersion(con->http) % 100);
if (!cupsArrayFind(ActiveClients, con))
{
cupsArrayAdd(ActiveClients, con);
cupsdSetBusyState(0);
}
case HTTP_STATE_OPTIONS :
case HTTP_STATE_DELETE :
case HTTP_STATE_GET :
case HTTP_STATE_HEAD :
case HTTP_STATE_POST :
case HTTP_STATE_PUT :
case HTTP_STATE_TRACE :
/*
* Parse incoming parameters until the status changes...
*/
while ((status = httpUpdate(con->http)) == HTTP_STATUS_CONTINUE)
if (!httpGetReady(con->http))
break;
if (status != HTTP_STATUS_OK && status != HTTP_STATUS_CONTINUE)
{
if (httpError(con->http) && httpError(con->http) != EPIPE)
cupsdLogClient(con, CUPSD_LOG_DEBUG,
"Closing for error %d (%s) while reading headers.",
httpError(con->http), strerror(httpError(con->http)));
else
cupsdLogClient(con, CUPSD_LOG_DEBUG,
"Closing on EOF while reading headers.");
cupsdSendError(con, HTTP_STATUS_BAD_REQUEST, CUPSD_AUTH_NONE);
cupsdCloseClient(con);
return;
}
break;
default :
if (!httpGetReady(con->http) && recv(httpGetFd(con->http), buf, 1, MSG_PEEK) < 1)
{
/*
* Connection closed...
*/
cupsdLogClient(con, CUPSD_LOG_DEBUG, "Closing on EOF.");
cupsdCloseClient(con);
return;
}
break; /* Anti-compiler-warning-code */
}
/*
* Handle new transfers...
*/
cupsdLogClient(con, CUPSD_LOG_DEBUG, "Read: status=%d, state=%d", status, httpGetState(con->http));
if (status == HTTP_STATUS_OK)
{
/*
* Record whether the client is a web browser. "Mozilla" was the original
* and it seems that every web browser in existence now uses that as the
* prefix with additional information identifying *which* browser.
*
* Chrome (at least) has problems with multiple WWW-Authenticate values in
* a single header, so we only report Basic or Negotiate to web browsers and
* leave the multiple choices to the native CUPS client...
*/
con->is_browser = !strncmp(httpGetField(con->http, HTTP_FIELD_USER_AGENT), "Mozilla/", 8);
if (httpGetField(con->http, HTTP_FIELD_ACCEPT_LANGUAGE)[0])
{
/*
* Figure out the locale from the Accept-Language and Content-Type
* fields...
*/
if ((ptr = strchr(httpGetField(con->http, HTTP_FIELD_ACCEPT_LANGUAGE),
',')) != NULL)
*ptr = '\0';
if ((ptr = strchr(httpGetField(con->http, HTTP_FIELD_ACCEPT_LANGUAGE),
';')) != NULL)
*ptr = '\0';
if ((ptr = strstr(httpGetField(con->http, HTTP_FIELD_CONTENT_TYPE),
"charset=")) != NULL)
{
/*
* Combine language and charset, and trim any extra params in the
* content-type.
*/
snprintf(locale, sizeof(locale), "%s.%s",
httpGetField(con->http, HTTP_FIELD_ACCEPT_LANGUAGE), ptr + 8);
if ((ptr = strchr(locale, ',')) != NULL)
*ptr = '\0';
}
else
snprintf(locale, sizeof(locale), "%s.UTF-8",
httpGetField(con->http, HTTP_FIELD_ACCEPT_LANGUAGE));
con->language = cupsLangGet(locale);
}
else
con->language = cupsLangGet(DefaultLocale);
cupsdAuthorize(con);
if (!_cups_strncasecmp(httpGetField(con->http, HTTP_FIELD_CONNECTION),
"Keep-Alive", 10) && KeepAlive)
httpSetKeepAlive(con->http, HTTP_KEEPALIVE_ON);
else if (!_cups_strncasecmp(httpGetField(con->http, HTTP_FIELD_CONNECTION),
"close", 5))
httpSetKeepAlive(con->http, HTTP_KEEPALIVE_OFF);
if (!httpGetField(con->http, HTTP_FIELD_HOST)[0] &&
httpGetVersion(con->http) >= HTTP_VERSION_1_1)
{
/*
* HTTP/1.1 and higher require the "Host:" field...
*/
if (!cupsdSendError(con, HTTP_STATUS_BAD_REQUEST, CUPSD_AUTH_NONE))
{
cupsdLogClient(con, CUPSD_LOG_ERROR, "Missing Host: field in request.");
cupsdCloseClient(con);
return;
}
}
else if (!valid_host(con))
{
/*
* Access to localhost must use "localhost" or the corresponding IPv4
* or IPv6 values in the Host: field.
*/
cupsdLogClient(con, CUPSD_LOG_ERROR,
"Request from \"%s\" using invalid Host: field \"%s\".",
httpGetHostname(con->http, NULL, 0), httpGetField(con->http, HTTP_FIELD_HOST));
if (!cupsdSendError(con, HTTP_STATUS_BAD_REQUEST, CUPSD_AUTH_NONE))
{
cupsdCloseClient(con);
return;
}
}
else if (con->operation == HTTP_STATE_OPTIONS)
{
/*
* Do OPTIONS command...
*/
if (con->best && con->best->type != CUPSD_AUTH_NONE)
{
httpClearFields(con->http);
if (!cupsdSendHeader(con, HTTP_STATUS_UNAUTHORIZED, NULL, CUPSD_AUTH_NONE))
{
cupsdCloseClient(con);
return;
}
}
if (!_cups_strcasecmp(httpGetField(con->http, HTTP_FIELD_CONNECTION), "Upgrade") && strstr(httpGetField(con->http, HTTP_FIELD_UPGRADE), "TLS/") != NULL && !httpIsEncrypted(con->http))
{
#ifdef HAVE_TLS
/*
* Do encryption stuff...
*/
httpClearFields(con->http);
if (!cupsdSendHeader(con, HTTP_STATUS_SWITCHING_PROTOCOLS, NULL, CUPSD_AUTH_NONE))
{
cupsdCloseClient(con);
return;
}
if (cupsd_start_tls(con, HTTP_ENCRYPTION_REQUIRED))
{
cupsdCloseClient(con);
return;
}
#else
if (!cupsdSendError(con, HTTP_STATUS_NOT_IMPLEMENTED, CUPSD_AUTH_NONE))
{
cupsdCloseClient(con);
return;
}
#endif /* HAVE_TLS */
}
httpClearFields(con->http);
httpSetField(con->http, HTTP_FIELD_CONTENT_LENGTH, "0");
if (!cupsdSendHeader(con, HTTP_STATUS_OK, NULL, CUPSD_AUTH_NONE))
{
cupsdCloseClient(con);
return;
}
}
else if (!is_path_absolute(con->uri))
{
/*
* Protect against malicious users!
*/
cupsdLogClient(con, CUPSD_LOG_ERROR,
"Request for non-absolute resource \"%s\".", con->uri);
if (!cupsdSendError(con, HTTP_STATUS_FORBIDDEN, CUPSD_AUTH_NONE))
{
cupsdCloseClient(con);
return;
}
}
else
{
if (!_cups_strcasecmp(httpGetField(con->http, HTTP_FIELD_CONNECTION),
"Upgrade") && !httpIsEncrypted(con->http))
{
#ifdef HAVE_TLS
/*
* Do encryption stuff...
*/
httpClearFields(con->http);
if (!cupsdSendHeader(con, HTTP_STATUS_SWITCHING_PROTOCOLS, NULL,
CUPSD_AUTH_NONE))
{
cupsdCloseClient(con);
return;
}
if (cupsd_start_tls(con, HTTP_ENCRYPTION_REQUIRED))
{
cupsdCloseClient(con);
return;
}
#else
if (!cupsdSendError(con, HTTP_STATUS_NOT_IMPLEMENTED, CUPSD_AUTH_NONE))
{
cupsdCloseClient(con);
return;
}
#endif /* HAVE_TLS */
}
if ((status = cupsdIsAuthorized(con, NULL)) != HTTP_STATUS_OK)
{
cupsdSendError(con, status, CUPSD_AUTH_NONE);
cupsdCloseClient(con);
return;
}
if (httpGetExpect(con->http) &&
(con->operation == HTTP_STATE_POST || con->operation == HTTP_STATE_PUT))
{
if (httpGetExpect(con->http) == HTTP_STATUS_CONTINUE)
{
/*
* Send 100-continue header...
*/
if (httpWriteResponse(con->http, HTTP_STATUS_CONTINUE))
{
cupsdCloseClient(con);
return;
}
}
else
{
/*
* Send 417-expectation-failed header...
*/
httpClearFields(con->http);
httpSetField(con->http, HTTP_FIELD_CONTENT_LENGTH, "0");
cupsdSendError(con, HTTP_STATUS_EXPECTATION_FAILED, CUPSD_AUTH_NONE);
cupsdCloseClient(con);
return;
}
}
switch (httpGetState(con->http))
{
case HTTP_STATE_GET_SEND :
cupsdLogClient(con, CUPSD_LOG_DEBUG, "Processing GET %s", con->uri);
if ((filename = get_file(con, &filestats, buf, sizeof(buf))) != NULL)
{
_cupsRWLockRead(&MimeDatabase->lock);
type = mimeFileType(MimeDatabase, filename, NULL, NULL);
_cupsRWUnlock(&MimeDatabase->lock);
cupsdLogClient(con, CUPSD_LOG_DEBUG, "filename=\"%s\", type=%s/%s", filename, type ? type->super : "", type ? type->type : "");
if (is_cgi(con, filename, &filestats, type))
{
/*
* Note: con->command and con->options were set by is_cgi()...
*/
if (!cupsdSendCommand(con, con->command, con->options, 0))
{
if (!cupsdSendError(con, HTTP_STATUS_NOT_FOUND, CUPSD_AUTH_NONE))
{
cupsdCloseClient(con);
return;
}
}
else
cupsdLogRequest(con, HTTP_STATUS_OK);
if (httpGetVersion(con->http) <= HTTP_VERSION_1_0)
httpSetKeepAlive(con->http, HTTP_KEEPALIVE_OFF);
break;
}
if (!check_if_modified(con, &filestats))
{
if (!cupsdSendError(con, HTTP_STATUS_NOT_MODIFIED, CUPSD_AUTH_NONE))
{
cupsdCloseClient(con);
return;
}
}
else
{
if (type == NULL)
strlcpy(line, "text/plain", sizeof(line));
else
snprintf(line, sizeof(line), "%s/%s", type->super, type->type);
if (!write_file(con, HTTP_STATUS_OK, filename, line, &filestats))
{
cupsdCloseClient(con);
return;
}
}
}
else if (!buf[0] && (!strncmp(con->uri, "/admin", 6) || !strncmp(con->uri, "/classes", 8) || !strncmp(con->uri, "/help", 5) || !strncmp(con->uri, "/jobs", 5) || !strncmp(con->uri, "/printers", 9)))
{
if (!WebInterface)
{
/*
* Web interface is disabled. Show an appropriate message...
*/
if (!cupsdSendError(con, HTTP_STATUS_CUPS_WEBIF_DISABLED, CUPSD_AUTH_NONE))
{
cupsdCloseClient(con);
return;
}
break;
}
/*
* Send CGI output...
*/
if (!strncmp(con->uri, "/admin", 6))
{
cupsdSetStringf(&con->command, "%s/cgi-bin/admin.cgi", ServerBin);
cupsdSetString(&con->options, strchr(con->uri + 6, '?'));
}
else if (!strncmp(con->uri, "/classes", 8))
{
cupsdSetStringf(&con->command, "%s/cgi-bin/classes.cgi", ServerBin);
if (con->uri[8] && con->uri[9])
cupsdSetString(&con->options, con->uri + 8);
else
cupsdSetString(&con->options, NULL);
}
else if (!strncmp(con->uri, "/jobs", 5))
{
cupsdSetStringf(&con->command, "%s/cgi-bin/jobs.cgi", ServerBin);
if (con->uri[5] && con->uri[6])
cupsdSetString(&con->options, con->uri + 5);
else
cupsdSetString(&con->options, NULL);
}
else if (!strncmp(con->uri, "/printers", 9))
{
cupsdSetStringf(&con->command, "%s/cgi-bin/printers.cgi", ServerBin);
if (con->uri[9] && con->uri[10])
cupsdSetString(&con->options, con->uri + 9);
else
cupsdSetString(&con->options, NULL);
}
else
{
cupsdSetStringf(&con->command, "%s/cgi-bin/help.cgi", ServerBin);
if (con->uri[5] && con->uri[6])
cupsdSetString(&con->options, con->uri + 5);
else
cupsdSetString(&con->options, NULL);
}
if (!cupsdSendCommand(con, con->command, con->options, 0))
{
if (!cupsdSendError(con, HTTP_STATUS_NOT_FOUND, CUPSD_AUTH_NONE))
{
cupsdCloseClient(con);
return;
}
}
else
cupsdLogRequest(con, HTTP_STATUS_OK);
if (httpGetVersion(con->http) <= HTTP_VERSION_1_0)
httpSetKeepAlive(con->http, HTTP_KEEPALIVE_OFF);
}
else
{
if (!cupsdSendError(con, HTTP_STATUS_NOT_FOUND, CUPSD_AUTH_NONE))
{
cupsdCloseClient(con);
return;
}
}
break;
case HTTP_STATE_POST_RECV :
/*
* See if the POST request includes a Content-Length field, and if
* so check the length against any limits that are set...
*/
if (httpGetField(con->http, HTTP_FIELD_CONTENT_LENGTH)[0] && MaxRequestSize > 0 && httpGetLength2(con->http) > MaxRequestSize)
{
/*
* Request too large...
*/
if (!cupsdSendError(con, HTTP_STATUS_REQUEST_TOO_LARGE, CUPSD_AUTH_NONE))
{
cupsdCloseClient(con);
return;
}
break;
}
else if (httpGetLength2(con->http) < 0)
{
/*
* Negative content lengths are invalid!
*/
if (!cupsdSendError(con, HTTP_STATUS_BAD_REQUEST, CUPSD_AUTH_NONE))
{
cupsdCloseClient(con);
return;
}
break;
}
/*
* See what kind of POST request this is; for IPP requests the
* content-type field will be "application/ipp"...
*/
if (!strcmp(httpGetField(con->http, HTTP_FIELD_CONTENT_TYPE), "application/ipp"))
{
con->request = ippNew();
break;
}
else if (!WebInterface)
{
/*
* Web interface is disabled. Show an appropriate message...
*/
if (!cupsdSendError(con, HTTP_STATUS_CUPS_WEBIF_DISABLED, CUPSD_AUTH_NONE))
{
cupsdCloseClient(con);
return;
}
break;
}
if ((filename = get_file(con, &filestats, buf, sizeof(buf))) != NULL)
{
/*
* POST to a file...
*/
type = mimeFileType(MimeDatabase, filename, NULL, NULL);
if (!is_cgi(con, filename, &filestats, type))
{
/*
* Only POST to CGI's...
*/
if (!cupsdSendError(con, HTTP_STATUS_UNAUTHORIZED, CUPSD_AUTH_NONE))
{
cupsdCloseClient(con);
return;
}
}
}
else if (!strncmp(con->uri, "/admin", 6) || !strncmp(con->uri, "/printers", 9) || !strncmp(con->uri, "/classes", 8) || !strncmp(con->uri, "/help", 5) || !strncmp(con->uri, "/jobs", 5))
{
/*
* CGI request...
*/
if (!strncmp(con->uri, "/admin", 6))
{
cupsdSetStringf(&con->command, "%s/cgi-bin/admin.cgi", ServerBin);
cupsdSetString(&con->options, strchr(con->uri + 6, '?'));
}
else if (!strncmp(con->uri, "/printers", 9))
{
cupsdSetStringf(&con->command, "%s/cgi-bin/printers.cgi", ServerBin);
if (con->uri[9] && con->uri[10])
cupsdSetString(&con->options, con->uri + 9);
else
cupsdSetString(&con->options, NULL);
}
else if (!strncmp(con->uri, "/classes", 8))
{
cupsdSetStringf(&con->command, "%s/cgi-bin/classes.cgi", ServerBin);
if (con->uri[8] && con->uri[9])
cupsdSetString(&con->options, con->uri + 8);
else
cupsdSetString(&con->options, NULL);
}
else if (!strncmp(con->uri, "/jobs", 5))
{
cupsdSetStringf(&con->command, "%s/cgi-bin/jobs.cgi", ServerBin);
if (con->uri[5] && con->uri[6])
cupsdSetString(&con->options, con->uri + 5);
else
cupsdSetString(&con->options, NULL);
}
else
{
cupsdSetStringf(&con->command, "%s/cgi-bin/help.cgi", ServerBin);
if (con->uri[5] && con->uri[6])
cupsdSetString(&con->options, con->uri + 5);
else
cupsdSetString(&con->options, NULL);
}
if (httpGetVersion(con->http) <= HTTP_VERSION_1_0)
httpSetKeepAlive(con->http, HTTP_KEEPALIVE_OFF);
}
else
{
if (!cupsdSendError(con, HTTP_STATUS_NOT_FOUND, CUPSD_AUTH_NONE))
{
cupsdCloseClient(con);
return;
}
}
break;
case HTTP_STATE_PUT_RECV :
/*
* Validate the resource name...
*/
if (strcmp(con->uri, "/admin/conf/cupsd.conf"))
{
/*
* PUT can only be done to the cupsd.conf file...
*/
cupsdLogClient(con, CUPSD_LOG_ERROR, "Disallowed PUT request for \"%s\".", con->uri);
if (!cupsdSendError(con, HTTP_STATUS_FORBIDDEN, CUPSD_AUTH_NONE))
{
cupsdCloseClient(con);
return;
}
break;
}
/*
* See if the PUT request includes a Content-Length field, and if
* so check the length against any limits that are set...
*/
if (httpGetField(con->http, HTTP_FIELD_CONTENT_LENGTH)[0] && MaxRequestSize > 0 && httpGetLength2(con->http) > MaxRequestSize)
{
/*
* Request too large...
*/
if (!cupsdSendError(con, HTTP_STATUS_REQUEST_TOO_LARGE, CUPSD_AUTH_NONE))
{
cupsdCloseClient(con);
return;
}
break;
}
else if (httpGetLength2(con->http) < 0)
{
/*
* Negative content lengths are invalid!
*/
if (!cupsdSendError(con, HTTP_STATUS_BAD_REQUEST, CUPSD_AUTH_NONE))
{
cupsdCloseClient(con);
return;
}
break;
}
/*
* Open a temporary file to hold the request...
*/
cupsdSetStringf(&con->filename, "%s/%08x", RequestRoot, request_id ++);
con->file = open(con->filename, O_WRONLY | O_CREAT | O_TRUNC, 0640);
if (con->file < 0)
{
cupsdLogClient(con, CUPSD_LOG_ERROR, "Unable to create request file \"%s\": %s", con->filename, strerror(errno));
if (!cupsdSendError(con, HTTP_STATUS_REQUEST_TOO_LARGE, CUPSD_AUTH_NONE))
{
cupsdCloseClient(con);
return;
}
}
fchmod(con->file, 0640);
fchown(con->file, RunUser, Group);
fcntl(con->file, F_SETFD, fcntl(con->file, F_GETFD) | FD_CLOEXEC);
break;
case HTTP_STATE_DELETE :
case HTTP_STATE_TRACE :
cupsdSendError(con, HTTP_STATUS_NOT_IMPLEMENTED, CUPSD_AUTH_NONE);
cupsdCloseClient(con);
return;
case HTTP_STATE_HEAD :
if ((filename = get_file(con, &filestats, buf, sizeof(buf))) != NULL)
{
if (!check_if_modified(con, &filestats))
{
if (!cupsdSendError(con, HTTP_STATUS_NOT_MODIFIED, CUPSD_AUTH_NONE))
{
cupsdCloseClient(con);
return;
}
cupsdLogRequest(con, HTTP_STATUS_NOT_MODIFIED);
}
else
{
/*
* Serve a file...
*/
type = mimeFileType(MimeDatabase, filename, NULL, NULL);
if (type == NULL)
strlcpy(line, "text/plain", sizeof(line));
else
snprintf(line, sizeof(line), "%s/%s", type->super, type->type);
httpClearFields(con->http);
httpSetField(con->http, HTTP_FIELD_LAST_MODIFIED, httpGetDateString(filestats.st_mtime));
httpSetLength(con->http, (size_t)filestats.st_size);
if (!cupsdSendHeader(con, HTTP_STATUS_OK, line, CUPSD_AUTH_NONE))
{
cupsdCloseClient(con);
return;
}
cupsdLogRequest(con, HTTP_STATUS_OK);
}
}
else if (!WebInterface)
{
httpClearFields(con->http);
if (!cupsdSendHeader(con, HTTP_STATUS_OK, NULL, CUPSD_AUTH_NONE))
{
cupsdCloseClient(con);
return;
}
cupsdLogRequest(con, HTTP_STATUS_OK);
break;
}
if (!buf[0] && (!strncmp(con->uri, "/admin", 6) || !strncmp(con->uri, "/classes", 8) || !strncmp(con->uri, "/help", 5) || !strncmp(con->uri, "/jobs", 5) || !strncmp(con->uri, "/printers", 9)))
{
/*
* CGI output...
*/
httpClearFields(con->http);
if (!cupsdSendHeader(con, HTTP_STATUS_OK, "text/html", CUPSD_AUTH_NONE))
{
cupsdCloseClient(con);
return;
}
cupsdLogRequest(con, HTTP_STATUS_OK);
}
else
{
httpClearFields(con->http);
if (!cupsdSendHeader(con, HTTP_STATUS_NOT_FOUND, "text/html", CUPSD_AUTH_NONE))
{
cupsdCloseClient(con);
return;
}
cupsdLogRequest(con, HTTP_STATUS_NOT_FOUND);
}
break;
default :
break; /* Anti-compiler-warning-code */
}
}
}
/*
* Handle any incoming data...
*/
switch (httpGetState(con->http))
{
case HTTP_STATE_PUT_RECV :
do
{
if ((bytes = httpRead2(con->http, line, sizeof(line))) < 0)
{
if (httpError(con->http) && httpError(con->http) != EPIPE)
cupsdLogClient(con, CUPSD_LOG_DEBUG,
"HTTP_STATE_PUT_RECV Closing for error %d (%s)",
httpError(con->http), strerror(httpError(con->http)));
else
cupsdLogClient(con, CUPSD_LOG_DEBUG,
"HTTP_STATE_PUT_RECV Closing on EOF.");
cupsdCloseClient(con);
return;
}
else if (bytes > 0)
{
con->bytes += bytes;
if (MaxRequestSize > 0 && con->bytes > MaxRequestSize)
{
close(con->file);
con->file = -1;
unlink(con->filename);
cupsdClearString(&con->filename);
if (!cupsdSendError(con, HTTP_STATUS_REQUEST_TOO_LARGE, CUPSD_AUTH_NONE))
{
cupsdCloseClient(con);
return;
}
}
if (write(con->file, line, (size_t)bytes) < bytes)
{
cupsdLogClient(con, CUPSD_LOG_ERROR,
"Unable to write %d bytes to \"%s\": %s", bytes,
con->filename, strerror(errno));
close(con->file);
con->file = -1;
unlink(con->filename);
cupsdClearString(&con->filename);
if (!cupsdSendError(con, HTTP_STATUS_REQUEST_TOO_LARGE, CUPSD_AUTH_NONE))
{
cupsdCloseClient(con);
return;
}
}
}
else if (httpGetState(con->http) == HTTP_STATE_PUT_RECV)
{
cupsdCloseClient(con);
return;
}
}
while (httpGetState(con->http) == HTTP_STATE_PUT_RECV && httpGetReady(con->http));
if (httpGetState(con->http) == HTTP_STATE_STATUS)
{
/*
* End of file, see how big it is...
*/
fstat(con->file, &filestats);
close(con->file);
con->file = -1;
if (filestats.st_size > MaxRequestSize &&
MaxRequestSize > 0)
{
/*
* Request is too big; remove it and send an error...
*/
unlink(con->filename);
cupsdClearString(&con->filename);
if (!cupsdSendError(con, HTTP_STATUS_REQUEST_TOO_LARGE, CUPSD_AUTH_NONE))
{
cupsdCloseClient(con);
return;
}
}
/*
* Install the configuration file...
*/
status = install_cupsd_conf(con);
/*
* Return the status to the client...
*/
if (!cupsdSendError(con, status, CUPSD_AUTH_NONE))
{
cupsdCloseClient(con);
return;
}
}
break;
case HTTP_STATE_POST_RECV :
do
{
if (con->request && con->file < 0)
{
/*
* Grab any request data from the connection...
*/
if (!httpWait(con->http, 0))
return;
if ((ipp_state = ippRead(con->http, con->request)) == IPP_STATE_ERROR)
{
cupsdLogClient(con, CUPSD_LOG_ERROR, "IPP read error: %s",
cupsLastErrorString());
cupsdSendError(con, HTTP_STATUS_BAD_REQUEST, CUPSD_AUTH_NONE);
cupsdCloseClient(con);
return;
}
else if (ipp_state != IPP_STATE_DATA)
{
if (httpGetState(con->http) == HTTP_STATE_POST_SEND)
{
cupsdSendError(con, HTTP_STATUS_BAD_REQUEST, CUPSD_AUTH_NONE);
cupsdCloseClient(con);
return;
}
if (httpGetReady(con->http))
continue;
break;
}
else
{
cupsdLogClient(con, CUPSD_LOG_DEBUG, "%d.%d %s %d",
con->request->request.op.version[0],
con->request->request.op.version[1],
ippOpString(con->request->request.op.operation_id),
con->request->request.op.request_id);
con->bytes += (off_t)ippLength(con->request);
}
}
if (con->file < 0 && httpGetState(con->http) != HTTP_STATE_POST_SEND)
{
/*
* Create a file as needed for the request data...
*/
cupsdSetStringf(&con->filename, "%s/%08x", RequestRoot,
request_id ++);
con->file = open(con->filename, O_WRONLY | O_CREAT | O_TRUNC, 0640);
if (con->file < 0)
{
cupsdLogClient(con, CUPSD_LOG_ERROR,
"Unable to create request file \"%s\": %s",
con->filename, strerror(errno));
if (!cupsdSendError(con, HTTP_STATUS_REQUEST_TOO_LARGE, CUPSD_AUTH_NONE))
{
cupsdCloseClient(con);
return;
}
}
fchmod(con->file, 0640);
fchown(con->file, RunUser, Group);
fcntl(con->file, F_SETFD, fcntl(con->file, F_GETFD) | FD_CLOEXEC);
}
if (httpGetState(con->http) != HTTP_STATE_POST_SEND)
{
if (!httpWait(con->http, 0))
return;
else if ((bytes = httpRead2(con->http, line, sizeof(line))) < 0)
{
if (httpError(con->http) && httpError(con->http) != EPIPE)
cupsdLogClient(con, CUPSD_LOG_DEBUG,
"HTTP_STATE_POST_SEND Closing for error %d (%s)",
httpError(con->http), strerror(httpError(con->http)));
else
cupsdLogClient(con, CUPSD_LOG_DEBUG,
"HTTP_STATE_POST_SEND Closing on EOF.");
cupsdCloseClient(con);
return;
}
else if (bytes > 0)
{
con->bytes += bytes;
if (MaxRequestSize > 0 && con->bytes > MaxRequestSize)
{
close(con->file);
con->file = -1;
unlink(con->filename);
cupsdClearString(&con->filename);
if (!cupsdSendError(con, HTTP_STATUS_REQUEST_TOO_LARGE, CUPSD_AUTH_NONE))
{
cupsdCloseClient(con);
return;
}
}
if (write(con->file, line, (size_t)bytes) < bytes)
{
cupsdLogClient(con, CUPSD_LOG_ERROR,
"Unable to write %d bytes to \"%s\": %s",
bytes, con->filename, strerror(errno));
close(con->file);
con->file = -1;
unlink(con->filename);
cupsdClearString(&con->filename);
if (!cupsdSendError(con, HTTP_STATUS_REQUEST_TOO_LARGE,
CUPSD_AUTH_NONE))
{
cupsdCloseClient(con);
return;
}
}
}
else if (httpGetState(con->http) == HTTP_STATE_POST_RECV)
return;
else if (httpGetState(con->http) != HTTP_STATE_POST_SEND)
{
cupsdLogClient(con, CUPSD_LOG_DEBUG,
"Closing on unexpected state %s.",
httpStateString(httpGetState(con->http)));
cupsdCloseClient(con);
return;
}
}
}
while (httpGetState(con->http) == HTTP_STATE_POST_RECV && httpGetReady(con->http));
if (httpGetState(con->http) == HTTP_STATE_POST_SEND)
{
if (con->file >= 0)
{
if (fstat(con->file, &filestats))
filestats.st_size = 0;
close(con->file);
con->file = -1;
if (filestats.st_size > MaxRequestSize &&
MaxRequestSize > 0)
{
/*
* Request is too big; remove it and send an error...
*/
unlink(con->filename);
cupsdClearString(&con->filename);
if (con->request)
{
/*
* Delete any IPP request data...
*/
ippDelete(con->request);
con->request = NULL;
}
if (!cupsdSendError(con, HTTP_STATUS_REQUEST_TOO_LARGE, CUPSD_AUTH_NONE))
{
cupsdCloseClient(con);
return;
}
}
else if (filestats.st_size == 0)
{
/*
* Don't allow empty file...
*/
unlink(con->filename);
cupsdClearString(&con->filename);
}
if (con->command)
{
if (!cupsdSendCommand(con, con->command, con->options, 0))
{
if (!cupsdSendError(con, HTTP_STATUS_NOT_FOUND, CUPSD_AUTH_NONE))
{
cupsdCloseClient(con);
return;
}
}
else
cupsdLogRequest(con, HTTP_STATUS_OK);
}
}
if (con->request)
{
cupsdProcessIPPRequest(con);
if (con->filename)
{
unlink(con->filename);
cupsdClearString(&con->filename);
}
return;
}
}
break;
default :
break; /* Anti-compiler-warning-code */
}
if (httpGetState(con->http) == HTTP_STATE_WAITING)
{
if (!httpGetKeepAlive(con->http))
{
cupsdLogClient(con, CUPSD_LOG_DEBUG,
"Closing because Keep-Alive is disabled.");
cupsdCloseClient(con);
}
else
{
cupsArrayRemove(ActiveClients, con);
cupsdSetBusyState(0);
}
}
}
/*
* 'cupsdSendCommand()' - Send output from a command via HTTP.
*/
int /* O - 1 on success, 0 on failure */
cupsdSendCommand(
cupsd_client_t *con, /* I - Client connection */
char *command, /* I - Command to run */
char *options, /* I - Command-line options */
int root) /* I - Run as root? */
{
int fd; /* Standard input file descriptor */
if (con->filename)
{
fd = open(con->filename, O_RDONLY);
if (fd < 0)
{
cupsdLogClient(con, CUPSD_LOG_ERROR,
"Unable to open \"%s\" for reading: %s",
con->filename ? con->filename : "/dev/null",
strerror(errno));
return (0);
}
fcntl(fd, F_SETFD, fcntl(fd, F_GETFD) | FD_CLOEXEC);
}
else
fd = -1;
con->pipe_pid = pipe_command(con, fd, &(con->file), command, options, root);
con->pipe_status = HTTP_STATUS_OK;
httpClearFields(con->http);
if (fd >= 0)
close(fd);
cupsdLogClient(con, CUPSD_LOG_INFO, "Started \"%s\" (pid=%d, file=%d)",
command, con->pipe_pid, con->file);
if (con->pipe_pid == 0)
return (0);
fcntl(con->file, F_SETFD, fcntl(con->file, F_GETFD) | FD_CLOEXEC);
cupsdAddSelect(con->file, (cupsd_selfunc_t)write_pipe, NULL, con);
cupsdLogClient(con, CUPSD_LOG_DEBUG, "Waiting for CGI data.");
con->sent_header = 0;
con->file_ready = 0;
con->got_fields = 0;
con->header_used = 0;
return (1);
}
/*
* 'cupsdSendError()' - Send an error message via HTTP.
*/
int /* O - 1 if successful, 0 otherwise */
cupsdSendError(cupsd_client_t *con, /* I - Connection */
http_status_t code, /* I - Error code */
int auth_type)/* I - Authentication type */
{
char location[HTTP_MAX_VALUE]; /* Location field */
cupsdLogClient(con, CUPSD_LOG_DEBUG2, "cupsdSendError code=%d, auth_type=%d", code, auth_type);
#ifdef HAVE_TLS
/*
* Force client to upgrade for authentication if that is how the
* server is configured...
*/
if (code == HTTP_STATUS_UNAUTHORIZED &&
DefaultEncryption == HTTP_ENCRYPTION_REQUIRED &&
_cups_strcasecmp(httpGetHostname(con->http, NULL, 0), "localhost") &&
!httpIsEncrypted(con->http))
{
code = HTTP_STATUS_UPGRADE_REQUIRED;
}
#endif /* HAVE_TLS */
/*
* Put the request in the access_log file...
*/
cupsdLogRequest(con, code);
/*
* To work around bugs in some proxies, don't use Keep-Alive for some
* error messages...
*
* Kerberos authentication doesn't work without Keep-Alive, so
* never disable it in that case.
*/
strlcpy(location, httpGetField(con->http, HTTP_FIELD_LOCATION), sizeof(location));
httpClearFields(con->http);
httpClearCookie(con->http);
httpSetField(con->http, HTTP_FIELD_LOCATION, location);
if (code >= HTTP_STATUS_BAD_REQUEST && con->type != CUPSD_AUTH_NEGOTIATE)
httpSetKeepAlive(con->http, HTTP_KEEPALIVE_OFF);
if (httpGetVersion(con->http) >= HTTP_VERSION_1_1 &&
httpGetKeepAlive(con->http) == HTTP_KEEPALIVE_OFF)
httpSetField(con->http, HTTP_FIELD_CONNECTION, "close");
if (code >= HTTP_STATUS_BAD_REQUEST)
{
/*
* Send a human-readable error message.
*/
char message[4096], /* Message for user */
urltext[1024], /* URL redirection text */
redirect[1024]; /* Redirection link */
const char *text; /* Status-specific text */
redirect[0] = '\0';
if (code == HTTP_STATUS_UNAUTHORIZED)
{
text = _cupsLangString(con->language,
_("Enter your username and password or the "
"root username and password to access this "
"page. If you are using Kerberos authentication, "
"make sure you have a valid Kerberos ticket."));
}
else if (code == HTTP_STATUS_FORBIDDEN)
{
if (con->username[0])
text = _cupsLangString(con->language, _("Your account does not have the necessary privileges."));
else
text = _cupsLangString(con->language, _("You cannot access this page."));
}
else if (code == HTTP_STATUS_UPGRADE_REQUIRED)
{
text = urltext;
snprintf(urltext, sizeof(urltext), _cupsLangString(con->language, _("You must access this page using the URL https://%s:%d%s.")), con->servername, con->serverport, con->uri);
snprintf(redirect, sizeof(redirect), "<META HTTP-EQUIV=\"Refresh\" CONTENT=\"3;URL=https://%s:%d%s\">\n", con->servername, con->serverport, con->uri);
}
else if (code == HTTP_STATUS_CUPS_WEBIF_DISABLED)
text = _cupsLangString(con->language,
_("The web interface is currently disabled. Run "
"\"cupsctl WebInterface=yes\" to enable it."));
else
text = "";
snprintf(message, sizeof(message),
"<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\" "
"\"http://www.w3.org/TR/html4/loose.dtd\">\n"
"<HTML>\n"
"<HEAD>\n"
"\t<META HTTP-EQUIV=\"Content-Type\" "
"CONTENT=\"text/html; charset=utf-8\">\n"
"\t<TITLE>%s - " CUPS_SVERSION "</TITLE>\n"
"\t<LINK REL=\"STYLESHEET\" TYPE=\"text/css\" "
"HREF=\"/cups.css\">\n"
"%s"
"</HEAD>\n"
"<BODY>\n"
"<H1>%s</H1>\n"
"<P>%s</P>\n"
"</BODY>\n"
"</HTML>\n",
_httpStatus(con->language, code), redirect,
_httpStatus(con->language, code), text);
/*
* Send an error message back to the client. If the error code is a
* 400 or 500 series, make sure the message contains some text, too!
*/
size_t length = strlen(message); /* Length of message */
httpSetLength(con->http, length);
if (!cupsdSendHeader(con, code, "text/html", auth_type))
return (0);
if (httpWrite2(con->http, message, length) < 0)
return (0);
if (httpFlushWrite(con->http) < 0)
return (0);
}
else
{
httpSetField(con->http, HTTP_FIELD_CONTENT_LENGTH, "0");
if (!cupsdSendHeader(con, code, NULL, auth_type))
return (0);
}
return (1);
}
/*
* 'cupsdSendHeader()' - Send an HTTP request.
*/
int /* O - 1 on success, 0 on failure */
cupsdSendHeader(
cupsd_client_t *con, /* I - Client to send to */
http_status_t code, /* I - HTTP status code */
char *type, /* I - MIME type of document */
int auth_type) /* I - Type of authentication */
{
char auth_str[1024]; /* Authorization string */
cupsdLogClient(con, CUPSD_LOG_DEBUG, "cupsdSendHeader: code=%d, type=\"%s\", auth_type=%d", code, type, auth_type);
/*
* Send the HTTP status header...
*/
if (code == HTTP_STATUS_CUPS_WEBIF_DISABLED)
{
/*
* Treat our special "web interface is disabled" status as "200 OK" for web
* browsers.
*/
code = HTTP_STATUS_OK;
}
if (ServerHeader)
httpSetField(con->http, HTTP_FIELD_SERVER, ServerHeader);
if (code == HTTP_STATUS_METHOD_NOT_ALLOWED)
httpSetField(con->http, HTTP_FIELD_ALLOW, "GET, HEAD, OPTIONS, POST, PUT");
if (code == HTTP_STATUS_UNAUTHORIZED)
{
if (auth_type == CUPSD_AUTH_NONE)
{
if (!con->best || con->best->type <= CUPSD_AUTH_NONE)
auth_type = cupsdDefaultAuthType();
else
auth_type = con->best->type;
}
auth_str[0] = '\0';
if (auth_type == CUPSD_AUTH_BASIC)
{
strlcpy(auth_str, "Basic realm=\"CUPS\"", sizeof(auth_str));
}
else if (auth_type == CUPSD_AUTH_NEGOTIATE)
{
strlcpy(auth_str, "Negotiate", sizeof(auth_str));
}
if (con->best && !con->is_browser && !_cups_strcasecmp(httpGetHostname(con->http, NULL, 0), "localhost"))
{
/*
* Add a "trc" (try root certification) parameter for local
* requests when the request requires system group membership - then the
* client knows the root certificate can/should be used.
*
* Also, for macOS we also look for @AUTHKEY and add an "AuthRef key=foo"
* method as needed...
*/
char *name, /* Current user name */
*auth_key; /* Auth key buffer */
size_t auth_size; /* Size of remaining buffer */
int need_local = 1; /* Do we need to list "Local" method? */
auth_key = auth_str + strlen(auth_str);
auth_size = sizeof(auth_str) - (size_t)(auth_key - auth_str);
#if defined(SO_PEERCRED) && defined(AF_LOCAL)
if (httpAddrFamily(httpGetAddress(con->http)) == AF_LOCAL)
{
strlcpy(auth_key, ", PeerCred", auth_size);
auth_key += 10;
auth_size -= 10;
}
#endif /* SO_PEERCRED && AF_LOCAL */
for (name = (char *)cupsArrayFirst(con->best->names);
name;
name = (char *)cupsArrayNext(con->best->names))
{
cupsdLogClient(con, CUPSD_LOG_DEBUG2, "cupsdSendHeader: require \"%s\"", name);
#ifdef HAVE_AUTHORIZATION_H
if (!_cups_strncasecmp(name, "@AUTHKEY(", 9))
{
snprintf(auth_key, auth_size, ", AuthRef key=\"%s\", Local trc=\"y\"", name + 9);
need_local = 0;
/* end parenthesis is stripped in conf.c */
break;
}
else
#endif /* HAVE_AUTHORIZATION_H */
if (!_cups_strcasecmp(name, "@SYSTEM"))
{
#ifdef HAVE_AUTHORIZATION_H
if (SystemGroupAuthKey)
snprintf(auth_key, auth_size, ", AuthRef key=\"%s\", Local trc=\"y\"", SystemGroupAuthKey);
else
#endif /* HAVE_AUTHORIZATION_H */
strlcpy(auth_key, ", Local trc=\"y\"", auth_size);
need_local = 0;
break;
}
}
if (need_local)
strlcat(auth_key, ", Local", auth_size);
}
if (auth_str[0])
{
cupsdLogClient(con, CUPSD_LOG_DEBUG, "WWW-Authenticate: %s", auth_str);
httpSetField(con->http, HTTP_FIELD_WWW_AUTHENTICATE, auth_str);
}
}
if (con->language && strcmp(con->language->language, "C"))
httpSetField(con->http, HTTP_FIELD_CONTENT_LANGUAGE, con->language->language);
if (type)
{
if (!strcmp(type, "text/html"))
httpSetField(con->http, HTTP_FIELD_CONTENT_TYPE, "text/html; charset=utf-8");
else
httpSetField(con->http, HTTP_FIELD_CONTENT_TYPE, type);
}
return (!httpWriteResponse(con->http, code));
}
/*
* 'cupsdUpdateCGI()' - Read status messages from CGI scripts and programs.
*/
void
cupsdUpdateCGI(void)
{
char *ptr, /* Pointer to end of line in buffer */
message[1024]; /* Pointer to message text */
int loglevel; /* Log level for message */
while ((ptr = cupsdStatBufUpdate(CGIStatusBuffer, &loglevel,
message, sizeof(message))) != NULL)
{
if (loglevel == CUPSD_LOG_INFO)
cupsdLogMessage(CUPSD_LOG_INFO, "%s", message);
if (!strchr(CGIStatusBuffer->buffer, '\n'))
break;
}
if (ptr == NULL && !CGIStatusBuffer->bufused)
{
/*
* Fatal error on pipe - should never happen!
*/
cupsdLogMessage(CUPSD_LOG_CRIT,
"cupsdUpdateCGI: error reading from CGI error pipe - %s",
strerror(errno));
}
}
/*
* 'cupsdWriteClient()' - Write data to a client as needed.
*/
void
cupsdWriteClient(cupsd_client_t *con) /* I - Client connection */
{
int bytes, /* Number of bytes written */
field_col; /* Current column */
char *bufptr, /* Pointer into buffer */
*bufend; /* Pointer to end of buffer */
ipp_state_t ipp_state; /* IPP state value */
cupsdLogClient(con, CUPSD_LOG_DEBUG, "con->http=%p", con->http);
cupsdLogClient(con, CUPSD_LOG_DEBUG,
"cupsdWriteClient "
"error=%d, "
"used=%d, "
"state=%s, "
"data_encoding=HTTP_ENCODING_%s, "
"data_remaining=" CUPS_LLFMT ", "
"response=%p(%s), "
"pipe_pid=%d, "
"file=%d",
httpError(con->http), (int)httpGetReady(con->http),
httpStateString(httpGetState(con->http)),
httpIsChunked(con->http) ? "CHUNKED" : "LENGTH",
CUPS_LLCAST httpGetLength2(con->http),
con->response,
con->response ? ippStateString(ippGetState(con->request)) : "",
con->pipe_pid, con->file);
if (httpGetState(con->http) != HTTP_STATE_GET_SEND &&
httpGetState(con->http) != HTTP_STATE_POST_SEND)
{
/*
* If we get called in the wrong state, then something went wrong with the
* connection and we need to shut it down...
*/
cupsdLogClient(con, CUPSD_LOG_DEBUG, "Closing on unexpected HTTP write state %s.",
httpStateString(httpGetState(con->http)));
cupsdCloseClient(con);
return;
}
if (con->pipe_pid)
{
/*
* Make sure we select on the CGI output...
*/
cupsdAddSelect(con->file, (cupsd_selfunc_t)write_pipe, NULL, con);
cupsdLogClient(con, CUPSD_LOG_DEBUG, "Waiting for CGI data.");
if (!con->file_ready)
{
/*
* Try again later when there is CGI output available...
*/
cupsdRemoveSelect(httpGetFd(con->http));
return;
}
con->file_ready = 0;
}
bytes = (ssize_t)(sizeof(con->header) - (size_t)con->header_used);
if (!con->pipe_pid && bytes > (ssize_t)httpGetRemaining(con->http))
{
/*
* Limit GET bytes to original size of file (STR #3265)...
*/
bytes = (ssize_t)httpGetRemaining(con->http);
}
if (con->response && con->response->state != IPP_STATE_DATA)
{
size_t wused = httpGetPending(con->http); /* Previous write buffer use */
do
{
/*
* Write a single attribute or the IPP message header...
*/
ipp_state = ippWrite(con->http, con->response);
/*
* If the write buffer has been flushed, stop buffering up attributes...
*/
if (httpGetPending(con->http) <= wused)
break;
}
while (ipp_state != IPP_STATE_DATA && ipp_state != IPP_STATE_ERROR);
cupsdLogClient(con, CUPSD_LOG_DEBUG,
"Writing IPP response, ipp_state=%s, old "
"wused=" CUPS_LLFMT ", new wused=" CUPS_LLFMT,
ippStateString(ipp_state),
CUPS_LLCAST wused, CUPS_LLCAST httpGetPending(con->http));
if (httpGetPending(con->http) > 0)
httpFlushWrite(con->http);
bytes = ipp_state != IPP_STATE_ERROR &&
(con->file >= 0 || ipp_state != IPP_STATE_DATA);
cupsdLogClient(con, CUPSD_LOG_DEBUG,
"bytes=%d, http_state=%d, data_remaining=" CUPS_LLFMT,
(int)bytes, httpGetState(con->http),
CUPS_LLCAST httpGetLength2(con->http));
}
else if ((bytes = read(con->file, con->header + con->header_used, (size_t)bytes)) > 0)
{
con->header_used += bytes;
if (con->pipe_pid && !con->got_fields)
{
/*
* Inspect the data for Content-Type and other fields.
*/
for (bufptr = con->header, bufend = con->header + con->header_used,
field_col = 0;
!con->got_fields && bufptr < bufend;
bufptr ++)
{
if (*bufptr == '\n')
{
/*
* Send line to client...
*/
if (bufptr > con->header && bufptr[-1] == '\r')
bufptr[-1] = '\0';
*bufptr++ = '\0';
cupsdLogClient(con, CUPSD_LOG_DEBUG, "Script header: %s", con->header);
if (!con->sent_header)
{
/*
* Handle redirection and CGI status codes...
*/
http_field_t field; /* HTTP field */
char *value = strchr(con->header, ':');
/* Value of field */
if (value)
{
*value++ = '\0';
while (isspace(*value & 255))
value ++;
}
field = httpFieldValue(con->header);
if (field != HTTP_FIELD_UNKNOWN && value)
{
httpSetField(con->http, field, value);
if (field == HTTP_FIELD_LOCATION)
{
con->pipe_status = HTTP_STATUS_SEE_OTHER;
con->sent_header = 2;
}
else
con->sent_header = 1;
}
else if (!_cups_strcasecmp(con->header, "Status") && value)
{
con->pipe_status = (http_status_t)atoi(value);
con->sent_header = 2;
}
else if (!_cups_strcasecmp(con->header, "Set-Cookie") && value)
{
httpSetCookie(con->http, value);
con->sent_header = 1;
}
}
/*
* Update buffer...
*/
con->header_used -= bufptr - con->header;
if (con->header_used > 0)
memmove(con->header, bufptr, (size_t)con->header_used);
bufptr = con->header - 1;
/*
* See if the line was empty...
*/
if (field_col == 0)
{
con->got_fields = 1;
if (httpGetVersion(con->http) == HTTP_VERSION_1_1 &&
!httpGetField(con->http, HTTP_FIELD_CONTENT_LENGTH)[0])
httpSetLength(con->http, 0);
cupsdLogClient(con, CUPSD_LOG_DEBUG, "Sending status %d for CGI.", con->pipe_status);
if (con->pipe_status == HTTP_STATUS_OK)
{
if (!cupsdSendHeader(con, con->pipe_status, NULL, CUPSD_AUTH_NONE))
{
cupsdCloseClient(con);
return;
}
}
else
{
if (!cupsdSendError(con, con->pipe_status, CUPSD_AUTH_NONE))
{
cupsdCloseClient(con);
return;
}
}
}
else
field_col = 0;
}
else if (*bufptr != '\r')
field_col ++;
}
if (!con->got_fields)
return;
}
if (con->header_used > 0)
{
if (httpWrite2(con->http, con->header, (size_t)con->header_used) < 0)
{
cupsdLogClient(con, CUPSD_LOG_DEBUG, "Closing for error %d (%s)",
httpError(con->http), strerror(httpError(con->http)));
cupsdCloseClient(con);
return;
}
if (httpIsChunked(con->http))
httpFlushWrite(con->http);
con->bytes += con->header_used;
if (httpGetState(con->http) == HTTP_STATE_WAITING)
bytes = 0;
else
bytes = con->header_used;
con->header_used = 0;
}
}
if (bytes <= 0 ||
(httpGetState(con->http) != HTTP_STATE_GET_SEND &&
httpGetState(con->http) != HTTP_STATE_POST_SEND))
{
if (!con->sent_header && con->pipe_pid)
cupsdSendError(con, HTTP_STATUS_SERVER_ERROR, CUPSD_AUTH_NONE);
else
{
cupsdLogRequest(con, HTTP_STATUS_OK);
if (httpIsChunked(con->http) && (!con->pipe_pid || con->sent_header > 0))
{
cupsdLogClient(con, CUPSD_LOG_DEBUG, "Sending 0-length chunk.");
if (httpWrite2(con->http, "", 0) < 0)
{
cupsdLogClient(con, CUPSD_LOG_DEBUG, "Closing for error %d (%s)",
httpError(con->http), strerror(httpError(con->http)));
cupsdCloseClient(con);
return;
}
}
cupsdLogClient(con, CUPSD_LOG_DEBUG, "Flushing write buffer.");
httpFlushWrite(con->http);
cupsdLogClient(con, CUPSD_LOG_DEBUG, "New state is %s", httpStateString(httpGetState(con->http)));
}
cupsdAddSelect(httpGetFd(con->http), (cupsd_selfunc_t)cupsdReadClient, NULL, con);
cupsdLogClient(con, CUPSD_LOG_DEBUG, "Waiting for request.");
if (con->file >= 0)
{
cupsdRemoveSelect(con->file);
if (con->pipe_pid)
cupsdEndProcess(con->pipe_pid, 0);
close(con->file);
con->file = -1;
con->pipe_pid = 0;
}
if (con->filename)
{
unlink(con->filename);
cupsdClearString(&con->filename);
}
if (con->request)
{
ippDelete(con->request);
con->request = NULL;
}
if (con->response)
{
ippDelete(con->response);
con->response = NULL;
}
cupsdClearString(&con->command);
cupsdClearString(&con->options);
cupsdClearString(&con->query_string);
if (!httpGetKeepAlive(con->http))
{
cupsdLogClient(con, CUPSD_LOG_DEBUG,
"Closing because Keep-Alive is disabled.");
cupsdCloseClient(con);
return;
}
else
{
cupsArrayRemove(ActiveClients, con);
cupsdSetBusyState(0);
}
}
}
/*
* 'check_if_modified()' - Decode an "If-Modified-Since" line.
*/
static int /* O - 1 if modified since */
check_if_modified(
cupsd_client_t *con, /* I - Client connection */
struct stat *filestats) /* I - File information */
{
const char *ptr; /* Pointer into field */
time_t date; /* Time/date value */
off_t size; /* Size/length value */
size = 0;
date = 0;
ptr = httpGetField(con->http, HTTP_FIELD_IF_MODIFIED_SINCE);
if (*ptr == '\0')
return (1);
cupsdLogClient(con, CUPSD_LOG_DEBUG2, "check_if_modified: filestats=%p(" CUPS_LLFMT ", %d)) If-Modified-Since=\"%s\"", filestats, CUPS_LLCAST filestats->st_size, (int)filestats->st_mtime, ptr);
while (*ptr != '\0')
{
while (isspace(*ptr) || *ptr == ';')
ptr ++;
if (_cups_strncasecmp(ptr, "length=", 7) == 0)
{
ptr += 7;
size = strtoll(ptr, NULL, 10);
while (isdigit(*ptr))
ptr ++;
}
else if (isalpha(*ptr))
{
date = httpGetDateTime(ptr);
while (*ptr != '\0' && *ptr != ';')
ptr ++;
}
else
ptr ++;
}
return ((size != filestats->st_size && size != 0) ||
(date < filestats->st_mtime && date != 0) ||
(size == 0 && date == 0));
}
/*
* 'compare_clients()' - Compare two client connections.
*/
static int /* O - Result of comparison */
compare_clients(cupsd_client_t *a, /* I - First client */
cupsd_client_t *b, /* I - Second client */
void *data) /* I - User data (not used) */
{
(void)data;
if (a == b)
return (0);
else if (a < b)
return (-1);
else
return (1);
}
#ifdef HAVE_TLS
/*
* 'cupsd_start_tls()' - Start encryption on a connection.
*/
static int /* O - 0 on success, -1 on error */
cupsd_start_tls(cupsd_client_t *con, /* I - Client connection */
http_encryption_t e) /* I - Encryption mode */
{
if (httpEncryption(con->http, e))
{
cupsdLogClient(con, CUPSD_LOG_ERROR, "Unable to encrypt connection: %s",
cupsLastErrorString());
return (-1);
}
cupsdLogClient(con, CUPSD_LOG_DEBUG, "Connection now encrypted.");
return (0);
}
#endif /* HAVE_TLS */
/*
* 'get_file()' - Get a filename and state info.
*/
static char * /* O - Real filename */
get_file(cupsd_client_t *con, /* I - Client connection */
struct stat *filestats, /* O - File information */
char *filename, /* IO - Filename buffer */
size_t len) /* I - Buffer length */
{
int status; /* Status of filesystem calls */
char *ptr; /* Pointer info filename */
size_t plen; /* Remaining length after pointer */
char language[7], /* Language subdirectory, if any */
dest[1024]; /* Destination name */
int perm_check = 1; /* Do permissions check? */
cupsd_printer_t *p; /* Printer */
/*
* Figure out the real filename...
*/
filename[0] = '\0';
language[0] = '\0';
if (!strncmp(con->uri, "/help", 5) && (con->uri[5] == '/' || !con->uri[5]))
{
/*
* All help files are served by the help.cgi program...
*/
return (NULL);
}
else if ((!strncmp(con->uri, "/ppd/", 5) || !strncmp(con->uri, "/printers/", 10) || !strncmp(con->uri, "/classes/", 9)) && !strcmp(con->uri + strlen(con->uri) - 4, ".ppd"))
{
strlcpy(dest, strchr(con->uri + 1, '/') + 1, sizeof(dest));
dest[strlen(dest) - 4] = '\0'; /* Strip .ppd */
if ((p = cupsdFindDest(dest)) == NULL)
{
strlcpy(filename, "/", len);
cupsdLogClient(con, CUPSD_LOG_INFO, "No destination \"%s\" found.", dest);
return (NULL);
}
if (p->type & CUPS_PRINTER_CLASS)
{
int i; /* Looping var */
for (i = 0; i < p->num_printers; i ++)
{
if (!(p->printers[i]->type & CUPS_PRINTER_CLASS))
{
snprintf(filename, len, "%s/ppd/%s.ppd", ServerRoot, p->printers[i]->name);
if (!access(filename, 0))
{
p = p->printers[i];
break;
}
}
}
if (i >= p->num_printers)
p = NULL;
}
else
snprintf(filename, len, "%s/ppd/%s.ppd", ServerRoot, p->name);
perm_check = 0;
}
else if ((!strncmp(con->uri, "/icons/", 7) || !strncmp(con->uri, "/printers/", 10) || !strncmp(con->uri, "/classes/", 9)) && !strcmp(con->uri + strlen(con->uri) - 4, ".png"))
{
strlcpy(dest, strchr(con->uri + 1, '/') + 1, sizeof(dest));
dest[strlen(dest) - 4] = '\0'; /* Strip .png */
if ((p = cupsdFindDest(dest)) == NULL)
{
strlcpy(filename, "/", len);
cupsdLogClient(con, CUPSD_LOG_INFO, "No destination \"%s\" found.", dest);
return (NULL);
}
if (p->type & CUPS_PRINTER_CLASS)
{
int i; /* Looping var */
for (i = 0; i < p->num_printers; i ++)
{
if (!(p->printers[i]->type & CUPS_PRINTER_CLASS))
{
snprintf(filename, len, "%s/images/%s.png", CacheDir, p->printers[i]->name);
if (!access(filename, 0))
{
p = p->printers[i];
break;
}
}
}
if (i >= p->num_printers)
p = NULL;
}
else
snprintf(filename, len, "%s/images/%s.png", CacheDir, p->name);
if (access(filename, F_OK) < 0)
snprintf(filename, len, "%s/images/generic.png", DocumentRoot);
perm_check = 0;
}
else if (!strcmp(con->uri, "/admin/conf/cupsd.conf"))
{
strlcpy(filename, ConfigurationFile, len);
perm_check = 0;
}
else if (!strncmp(con->uri, "/admin/log/", 11))
{
if (!strncmp(con->uri + 11, "access_log", 10) && AccessLog[0] == '/')
strlcpy(filename, AccessLog, len);
else if (!strncmp(con->uri + 11, "error_log", 9) && ErrorLog[0] == '/')
strlcpy(filename, ErrorLog, len);
else if (!strncmp(con->uri + 11, "page_log", 8) && PageLog[0] == '/')
strlcpy(filename, PageLog, len);
else
return (NULL);
perm_check = 0;
}
else if (!strncmp(con->uri, "/admin", 6) || !strncmp(con->uri, "/classes", 8) || !strncmp(con->uri, "/jobs", 5) || !strncmp(con->uri, "/printers", 9))
{
/*
* Admin/class/job/printer pages are served by CGI...
*/
return (NULL);
}
else if (!strncmp(con->uri, "/rss/", 5) && !strchr(con->uri + 5, '/'))
snprintf(filename, len, "%s/rss/%s", CacheDir, con->uri + 5);
else if (!strncmp(con->uri, "/strings/", 9) && !strcmp(con->uri + strlen(con->uri) - 8, ".strings"))
{
strlcpy(dest, con->uri + 9, sizeof(dest));
dest[strlen(dest) - 8] = '\0';
if ((p = cupsdFindDest(dest)) == NULL)
{
strlcpy(filename, "/", len);
cupsdLogClient(con, CUPSD_LOG_INFO, "No destination \"%s\" found.", dest);
return (NULL);
}
if (!p->strings)
{
strlcpy(filename, "/", len);
cupsdLogClient(con, CUPSD_LOG_INFO, "No strings files for \"%s\".", dest);
return (NULL);
}
strlcpy(filename, p->strings, len);
perm_check = 0;
}
else if (con->language)
{
snprintf(language, sizeof(language), "/%s", con->language->language);
snprintf(filename, len, "%s%s%s", DocumentRoot, language, con->uri);
}
else
snprintf(filename, len, "%s%s", DocumentRoot, con->uri);
if ((ptr = strchr(filename, '?')) != NULL)
*ptr = '\0';
/*
* Grab the status for this language; if there isn't a language-specific file
* then fallback to the default one...
*/
if ((status = lstat(filename, filestats)) != 0 && language[0] &&
strncmp(con->uri, "/icons/", 7) &&
strncmp(con->uri, "/ppd/", 5) &&
strncmp(con->uri, "/rss/", 5) &&
strncmp(con->uri, "/strings/", 9) &&
strncmp(con->uri, "/admin/conf/", 12) &&
strncmp(con->uri, "/admin/log/", 11))
{
/*
* Drop the country code...
*/
language[3] = '\0';
snprintf(filename, len, "%s%s%s", DocumentRoot, language, con->uri);
if ((ptr = strchr(filename, '?')) != NULL)
*ptr = '\0';
if ((status = lstat(filename, filestats)) != 0)
{
/*
* Drop the language prefix and try the root directory...
*/
language[0] = '\0';
snprintf(filename, len, "%s%s", DocumentRoot, con->uri);
if ((ptr = strchr(filename, '?')) != NULL)
*ptr = '\0';
status = lstat(filename, filestats);
}
}
/*
* If we've found a symlink, 404 the sucker to avoid disclosing information.
*/
if (!status && S_ISLNK(filestats->st_mode))
{
cupsdLogClient(con, CUPSD_LOG_INFO, "Symlinks such as \"%s\" are not allowed.", filename);
return (NULL);
}
/*
* Similarly, if the file/directory does not have world read permissions, do
* not allow access...
*/
if (!status && perm_check && !(filestats->st_mode & S_IROTH))
{
cupsdLogClient(con, CUPSD_LOG_INFO, "Files/directories such as \"%s\" must be world-readable.", filename);
return (NULL);
}
/*
* If we've found a directory, get the index.html file instead...
*/
if (!status && S_ISDIR(filestats->st_mode))
{
/*
* Make sure the URI ends with a slash...
*/
if (con->uri[strlen(con->uri) - 1] != '/')
strlcat(con->uri, "/", sizeof(con->uri));
/*
* Find the directory index file, trying every language...
*/
do
{
if (status && language[0])
{
/*
* Try a different language subset...
*/
if (language[3])
language[3] = '\0'; /* Strip country code */
else
language[0] = '\0'; /* Strip language */
}
/*
* Look for the index file...
*/
snprintf(filename, len, "%s%s%s", DocumentRoot, language, con->uri);
if ((ptr = strchr(filename, '?')) != NULL)
*ptr = '\0';
ptr = filename + strlen(filename);
plen = len - (size_t)(ptr - filename);
strlcpy(ptr, "index.html", plen);
status = lstat(filename, filestats);
}
while (status && language[0]);
/*
* If we've found a symlink, 404 the sucker to avoid disclosing information.
*/
if (!status && S_ISLNK(filestats->st_mode))
{
cupsdLogClient(con, CUPSD_LOG_INFO, "Symlinks such as \"%s\" are not allowed.", filename);
return (NULL);
}
/*
* Similarly, if the file/directory does not have world read permissions, do
* not allow access...
*/
if (!status && perm_check && !(filestats->st_mode & S_IROTH))
{
cupsdLogClient(con, CUPSD_LOG_INFO, "Files/directories such as \"%s\" must be world-readable.", filename);
return (NULL);
}
}
cupsdLogClient(con, CUPSD_LOG_DEBUG2, "get_file: filestats=%p, filename=%p, len=" CUPS_LLFMT ", returning \"%s\".", filestats, filename, CUPS_LLCAST len, status ? "(null)" : filename);
if (status)
return (NULL);
else
return (filename);
}
/*
* 'install_cupsd_conf()' - Install a configuration file.
*/
static http_status_t /* O - Status */
install_cupsd_conf(cupsd_client_t *con) /* I - Connection */
{
char filename[1024]; /* Configuration filename */
cups_file_t *in, /* Input file */
*out; /* Output file */
char buffer[16384]; /* Copy buffer */
ssize_t bytes; /* Number of bytes */
/*
* Open the request file...
*/
if ((in = cupsFileOpen(con->filename, "rb")) == NULL)
{
cupsdLogClient(con, CUPSD_LOG_ERROR, "Unable to open request file \"%s\": %s",
con->filename, strerror(errno));
goto server_error;
}
/*
* Open the new config file...
*/
if ((out = cupsdCreateConfFile(ConfigurationFile, ConfigFilePerm)) == NULL)
{
cupsFileClose(in);
goto server_error;
}
cupsdLogClient(con, CUPSD_LOG_INFO, "Installing config file \"%s\"...",
ConfigurationFile);
/*
* Copy from the request to the new config file...
*/
while ((bytes = cupsFileRead(in, buffer, sizeof(buffer))) > 0)
if (cupsFileWrite(out, buffer, (size_t)bytes) < bytes)
{
cupsdLogClient(con, CUPSD_LOG_ERROR,
"Unable to copy to config file \"%s\": %s",
ConfigurationFile, strerror(errno));
cupsFileClose(in);
cupsFileClose(out);
snprintf(filename, sizeof(filename), "%s.N", ConfigurationFile);
cupsdUnlinkOrRemoveFile(filename);
goto server_error;
}
/*
* Close the files...
*/
cupsFileClose(in);
if (cupsdCloseCreatedConfFile(out, ConfigurationFile))
goto server_error;
/*
* Remove the request file...
*/
cupsdUnlinkOrRemoveFile(con->filename);
cupsdClearString(&con->filename);
/*
* Set the NeedReload flag...
*/
NeedReload = RELOAD_CUPSD;
ReloadTime = time(NULL);
/*
* Return that the file was created successfully...
*/
return (HTTP_STATUS_CREATED);
/*
* Common exit for errors...
*/
server_error:
cupsdUnlinkOrRemoveFile(con->filename);
cupsdClearString(&con->filename);
return (HTTP_STATUS_SERVER_ERROR);
}
/*
* 'is_cgi()' - Is the resource a CGI script/program?
*/
static int /* O - 1 = CGI, 0 = file */
is_cgi(cupsd_client_t *con, /* I - Client connection */
const char *filename, /* I - Real filename */
struct stat *filestats, /* I - File information */
mime_type_t *type) /* I - MIME type */
{
const char *options; /* Options on URL */
/*
* Get the options, if any...
*/
if ((options = strchr(con->uri, '?')) != NULL)
{
options ++;
cupsdSetStringf(&(con->query_string), "QUERY_STRING=%s", options);
}
/*
* Check for known types...
*/
if (!type || _cups_strcasecmp(type->super, "application"))
{
cupsdLogClient(con, CUPSD_LOG_DEBUG2, "is_cgi: filename=\"%s\", filestats=%p, type=%s/%s, returning 0.", filename, filestats, type ? type->super : "unknown", type ? type->type : "unknown");
return (0);
}
if (!_cups_strcasecmp(type->type, "x-httpd-cgi") && (filestats->st_mode & 0111) && (getuid() || !(filestats->st_mode & 022)))
{
/*
* "application/x-httpd-cgi" is a CGI script.
*/
cupsdSetString(&con->command, filename);
if (options)
cupsdSetStringf(&con->options, " %s", options);
cupsdLogClient(con, CUPSD_LOG_DEBUG2, "is_cgi: filename=\"%s\", filestats=%p, type=%s/%s, returning 1.", filename, filestats, type->super, type->type);
return (1);
}
cupsdLogClient(con, CUPSD_LOG_DEBUG2, "is_cgi: filename=\"%s\", filestats=%p, type=%s/%s, returning 0.", filename, filestats, type->super, type->type);
return (0);
}
/*
* 'is_path_absolute()' - Is a path absolute and free of relative elements (i.e. "..").
*/
static int /* O - 0 if relative, 1 if absolute */
is_path_absolute(const char *path) /* I - Input path */
{
/*
* Check for a leading slash...
*/
if (path[0] != '/')
return (0);
/*
* Check for "<" or quotes in the path and reject since this is probably
* someone trying to inject HTML...
*/
if (strchr(path, '<') != NULL || strchr(path, '\"') != NULL || strchr(path, '\'') != NULL)
return (0);
/*
* Check for "/.." in the path...
*/
while ((path = strstr(path, "/..")) != NULL)
{
if (!path[3] || path[3] == '/')
return (0);
path ++;
}
/*
* If we haven't found any relative paths, return 1 indicating an
* absolute path...
*/
return (1);
}
/*
* 'pipe_command()' - Pipe the output of a command to the remote client.
*/
static int /* O - Process ID */
pipe_command(cupsd_client_t *con, /* I - Client connection */
int infile, /* I - Standard input for command */
int *outfile, /* O - Standard output for command */
char *command, /* I - Command to run */
char *options, /* I - Options for command */
int root) /* I - Run as root? */
{
int i; /* Looping var */
int pid; /* Process ID */
char *commptr, /* Command string pointer */
commch; /* Command string character */
char *uriptr; /* URI string pointer */
int fds[2]; /* Pipe FDs */
int argc; /* Number of arguments */
int envc; /* Number of environment variables */
char argbuf[10240], /* Argument buffer */
*argv[100], /* Argument strings */
*envp[MAX_ENV + 20]; /* Environment variables */
char auth_type[256], /* AUTH_TYPE environment variable */
content_length[1024], /* CONTENT_LENGTH environment variable */
content_type[1024], /* CONTENT_TYPE environment variable */
http_cookie[32768], /* HTTP_COOKIE environment variable */
http_referer[1024], /* HTTP_REFERER environment variable */
http_user_agent[1024], /* HTTP_USER_AGENT environment variable */
lang[1024], /* LANG environment variable */
path_info[1024], /* PATH_INFO environment variable */
remote_addr[1024], /* REMOTE_ADDR environment variable */
remote_host[1024], /* REMOTE_HOST environment variable */
remote_user[1024], /* REMOTE_USER environment variable */
script_filename[1024], /* SCRIPT_FILENAME environment variable */
script_name[1024], /* SCRIPT_NAME environment variable */
server_name[1024], /* SERVER_NAME environment variable */
server_port[1024]; /* SERVER_PORT environment variable */
ipp_attribute_t *attr; /* attributes-natural-language attribute */
/*
* Parse a copy of the options string, which is of the form:
*
* argument+argument+argument
* ?argument+argument+argument
* param=value&param=value
* ?param=value&param=value
* /name?argument+argument+argument
* /name?param=value&param=value
*
* If the string contains an "=" character after the initial name,
* then we treat it as a HTTP GET form request and make a copy of
* the remaining string for the environment variable.
*
* The string is always parsed out as command-line arguments, to
* be consistent with Apache...
*/
cupsdLogClient(con, CUPSD_LOG_DEBUG2, "pipe_command: infile=%d, outfile=%p, command=\"%s\", options=\"%s\", root=%d", infile, outfile, command, options ? options : "(null)", root);
argv[0] = command;
if (options)
strlcpy(argbuf, options, sizeof(argbuf));
else
argbuf[0] = '\0';
if (argbuf[0] == '/')
{
/*
* Found some trailing path information, set PATH_INFO...
*/
if ((commptr = strchr(argbuf, '?')) == NULL)
commptr = argbuf + strlen(argbuf);
commch = *commptr;
*commptr = '\0';
snprintf(path_info, sizeof(path_info), "PATH_INFO=%s", argbuf);
*commptr = commch;
}
else
{
commptr = argbuf;
path_info[0] = '\0';
if (*commptr == ' ')
commptr ++;
}
if (*commptr == '?' && con->operation == HTTP_STATE_GET && !con->query_string)
{
commptr ++;
cupsdSetStringf(&(con->query_string), "QUERY_STRING=%s", commptr);
}
argc = 1;
if (*commptr)
{
argv[argc ++] = commptr;
for (; *commptr && argc < 99; commptr ++)
{
/*
* Break arguments whenever we see a + or space...
*/
if (*commptr == ' ' || *commptr == '+')
{
while (*commptr == ' ' || *commptr == '+')
*commptr++ = '\0';
/*
* If we don't have a blank string, save it as another argument...
*/
if (*commptr)
{
argv[argc] = commptr;
argc ++;
}
else
break;
}
else if (*commptr == '%' && isxdigit(commptr[1] & 255) &&
isxdigit(commptr[2] & 255))
{
/*
* Convert the %xx notation to the individual character.
*/
if (commptr[1] >= '0' && commptr[1] <= '9')
*commptr = (char)((commptr[1] - '0') << 4);
else
*commptr = (char)((tolower(commptr[1]) - 'a' + 10) << 4);
if (commptr[2] >= '0' && commptr[2] <= '9')
*commptr |= commptr[2] - '0';
else
*commptr |= tolower(commptr[2]) - 'a' + 10;
_cups_strcpy(commptr + 1, commptr + 3);
/*
* Check for a %00 and break if that is the case...
*/
if (!*commptr)
break;
}
}
}
argv[argc] = NULL;
/*
* Setup the environment variables as needed...
*/
if (con->username[0])
{
snprintf(auth_type, sizeof(auth_type), "AUTH_TYPE=%s",
httpGetField(con->http, HTTP_FIELD_AUTHORIZATION));
if ((uriptr = strchr(auth_type + 10, ' ')) != NULL)
*uriptr = '\0';
}
else
auth_type[0] = '\0';
if (con->request && (attr = ippFindAttribute(con->request, "attributes-natural-language", IPP_TAG_LANGUAGE)) != NULL)
{
cups_lang_t *language = cupsLangGet(ippGetString(attr, 0, NULL));
snprintf(lang, sizeof(lang), "LANG=%s.UTF8", language->language);
cupsLangFree(language);
}
else if (con->language)
snprintf(lang, sizeof(lang), "LANG=%s.UTF8", con->language->language);
else
strlcpy(lang, "LANG=C", sizeof(lang));
strlcpy(remote_addr, "REMOTE_ADDR=", sizeof(remote_addr));
httpAddrString(httpGetAddress(con->http), remote_addr + 12,
sizeof(remote_addr) - 12);
snprintf(remote_host, sizeof(remote_host), "REMOTE_HOST=%s",
httpGetHostname(con->http, NULL, 0));
snprintf(script_name, sizeof(script_name), "SCRIPT_NAME=%s", con->uri);
if ((uriptr = strchr(script_name, '?')) != NULL)
*uriptr = '\0';
snprintf(script_filename, sizeof(script_filename), "SCRIPT_FILENAME=%s%s",
DocumentRoot, script_name + 12);
snprintf(server_port, sizeof(server_port), "SERVER_PORT=%d", con->serverport);
if (httpGetField(con->http, HTTP_FIELD_HOST)[0])
{
char *nameptr; /* Pointer to ":port" */
snprintf(server_name, sizeof(server_name), "SERVER_NAME=%s",
httpGetField(con->http, HTTP_FIELD_HOST));
if ((nameptr = strrchr(server_name, ':')) != NULL && !strchr(nameptr, ']'))
*nameptr = '\0'; /* Strip trailing ":port" */
}
else
snprintf(server_name, sizeof(server_name), "SERVER_NAME=%s",
con->servername);
envc = cupsdLoadEnv(envp, (int)(sizeof(envp) / sizeof(envp[0])));
if (auth_type[0])
envp[envc ++] = auth_type;
envp[envc ++] = lang;
envp[envc ++] = "REDIRECT_STATUS=1";
envp[envc ++] = "GATEWAY_INTERFACE=CGI/1.1";
envp[envc ++] = server_name;
envp[envc ++] = server_port;
envp[envc ++] = remote_addr;
envp[envc ++] = remote_host;
envp[envc ++] = script_name;
envp[envc ++] = script_filename;
if (path_info[0])
envp[envc ++] = path_info;
if (con->username[0])
{
snprintf(remote_user, sizeof(remote_user), "REMOTE_USER=%s", con->username);
envp[envc ++] = remote_user;
}
if (httpGetVersion(con->http) == HTTP_VERSION_1_1)
envp[envc ++] = "SERVER_PROTOCOL=HTTP/1.1";
else if (httpGetVersion(con->http) == HTTP_VERSION_1_0)
envp[envc ++] = "SERVER_PROTOCOL=HTTP/1.0";
else
envp[envc ++] = "SERVER_PROTOCOL=HTTP/0.9";
if (httpGetCookie(con->http))
{
snprintf(http_cookie, sizeof(http_cookie), "HTTP_COOKIE=%s",
httpGetCookie(con->http));
envp[envc ++] = http_cookie;
}
if (httpGetField(con->http, HTTP_FIELD_USER_AGENT)[0])
{
snprintf(http_user_agent, sizeof(http_user_agent), "HTTP_USER_AGENT=%s",
httpGetField(con->http, HTTP_FIELD_USER_AGENT));
envp[envc ++] = http_user_agent;
}
if (httpGetField(con->http, HTTP_FIELD_REFERER)[0])
{
snprintf(http_referer, sizeof(http_referer), "HTTP_REFERER=%s",
httpGetField(con->http, HTTP_FIELD_REFERER));
envp[envc ++] = http_referer;
}
if (con->operation == HTTP_STATE_GET)
{
envp[envc ++] = "REQUEST_METHOD=GET";
if (con->query_string)
{
/*
* Add GET form variables after ?...
*/
envp[envc ++] = con->query_string;
}
else
envp[envc ++] = "QUERY_STRING=";
}
else
{
snprintf(content_length, sizeof(content_length), "CONTENT_LENGTH=" CUPS_LLFMT, CUPS_LLCAST con->bytes);
snprintf(content_type, sizeof(content_type), "CONTENT_TYPE=%s",
httpGetField(con->http, HTTP_FIELD_CONTENT_TYPE));
envp[envc ++] = "REQUEST_METHOD=POST";
envp[envc ++] = content_length;
envp[envc ++] = content_type;
}
/*
* Tell the CGI if we are using encryption...
*/
if (httpIsEncrypted(con->http))
envp[envc ++] = "HTTPS=ON";
/*
* Terminate the environment array...
*/
envp[envc] = NULL;
if (LogLevel >= CUPSD_LOG_DEBUG)
{
for (i = 0; i < argc; i ++)
cupsdLogMessage(CUPSD_LOG_DEBUG,
"[CGI] argv[%d] = \"%s\"", i, argv[i]);
for (i = 0; i < envc; i ++)
cupsdLogMessage(CUPSD_LOG_DEBUG,
"[CGI] envp[%d] = \"%s\"", i, envp[i]);
}
/*
* Create a pipe for the output...
*/
if (cupsdOpenPipe(fds))
{
cupsdLogMessage(CUPSD_LOG_ERROR, "[CGI] Unable to create pipe for %s - %s",
argv[0], strerror(errno));
return (0);
}
/*
* Then execute the command...
*/
if (cupsdStartProcess(command, argv, envp, infile, fds[1], CGIPipes[1],
-1, -1, root, DefaultProfile, NULL, &pid) < 0)
{
/*
* Error - can't fork!
*/
cupsdLogMessage(CUPSD_LOG_ERROR, "[CGI] Unable to start %s - %s", argv[0],
strerror(errno));
cupsdClosePipe(fds);
pid = 0;
}
else
{
/*
* Fork successful - return the PID...
*/
if (con->username[0])
cupsdAddCert(pid, con->username, con->type);
cupsdLogMessage(CUPSD_LOG_DEBUG, "[CGI] Started %s (PID %d)", command, pid);
*outfile = fds[0];
close(fds[1]);
}
return (pid);
}
/*
* 'valid_host()' - Is the Host: field valid?
*/
static int /* O - 1 if valid, 0 if not */
valid_host(cupsd_client_t *con) /* I - Client connection */
{
cupsd_alias_t *a; /* Current alias */
cupsd_netif_t *netif; /* Current network interface */
const char *end; /* End character */
char *ptr; /* Pointer into host value */
/*
* Copy the Host: header for later use...
*/
strlcpy(con->clientname, httpGetField(con->http, HTTP_FIELD_HOST),
sizeof(con->clientname));
if ((ptr = strrchr(con->clientname, ':')) != NULL && !strchr(ptr, ']'))
{
*ptr++ = '\0';
con->clientport = atoi(ptr);
}
else
con->clientport = con->serverport;
/*
* Then validate...
*/
if (httpAddrLocalhost(httpGetAddress(con->http)))
{
/*
* Only allow "localhost" or the equivalent IPv4 or IPv6 numerical
* addresses when accessing CUPS via the loopback interface...
*/
return (!_cups_strcasecmp(con->clientname, "localhost") ||
!_cups_strcasecmp(con->clientname, "localhost.") ||
!strcmp(con->clientname, "127.0.0.1") ||
!strcmp(con->clientname, "[::1]"));
}
#ifdef HAVE_DNSSD
/*
* Check if the hostname is something.local (Bonjour); if so, allow it.
*/
if ((end = strrchr(con->clientname, '.')) != NULL && end > con->clientname &&
!end[1])
{
/*
* "." on end, work back to second-to-last "."...
*/
for (end --; end > con->clientname && *end != '.'; end --);
}
if (end && (!_cups_strcasecmp(end, ".local") ||
!_cups_strcasecmp(end, ".local.")))
return (1);
#endif /* HAVE_DNSSD */
/*
* Check if the hostname is an IP address...
*/
if (isdigit(con->clientname[0] & 255) || con->clientname[0] == '[')
{
/*
* Possible IPv4/IPv6 address...
*/
http_addrlist_t *addrlist; /* List of addresses */
if ((addrlist = httpAddrGetList(con->clientname, AF_UNSPEC, NULL)) != NULL)
{
/*
* Good IPv4/IPv6 address...
*/
httpAddrFreeList(addrlist);
return (1);
}
}
/*
* Check for (alias) name matches...
*/
for (a = (cupsd_alias_t *)cupsArrayFirst(ServerAlias);
a;
a = (cupsd_alias_t *)cupsArrayNext(ServerAlias))
{
/*
* "ServerAlias *" allows all host values through...
*/
if (!strcmp(a->name, "*"))
return (1);
if (!_cups_strncasecmp(con->clientname, a->name, a->namelen))
{
/*
* Prefix matches; check the character at the end - it must be "." or nul.
*/
end = con->clientname + a->namelen;
if (!*end || (*end == '.' && !end[1]))
return (1);
}
}
#ifdef HAVE_DNSSD
for (a = (cupsd_alias_t *)cupsArrayFirst(DNSSDAlias);
a;
a = (cupsd_alias_t *)cupsArrayNext(DNSSDAlias))
{
/*
* "ServerAlias *" allows all host values through...
*/
if (!strcmp(a->name, "*"))
return (1);
if (!_cups_strncasecmp(con->clientname, a->name, a->namelen))
{
/*
* Prefix matches; check the character at the end - it must be "." or nul.
*/
end = con->clientname + a->namelen;
if (!*end || (*end == '.' && !end[1]))
return (1);
}
}
#endif /* HAVE_DNSSD */
/*
* Check for interface hostname matches...
*/
for (netif = (cupsd_netif_t *)cupsArrayFirst(NetIFList);
netif;
netif = (cupsd_netif_t *)cupsArrayNext(NetIFList))
{
if (!_cups_strncasecmp(con->clientname, netif->hostname, netif->hostlen))
{
/*
* Prefix matches; check the character at the end - it must be "." or nul.
*/
end = con->clientname + netif->hostlen;
if (!*end || (*end == '.' && !end[1]))
return (1);
}
}
return (0);
}
/*
* 'write_file()' - Send a file via HTTP.
*/
static int /* O - 0 on failure, 1 on success */
write_file(cupsd_client_t *con, /* I - Client connection */
http_status_t code, /* I - HTTP status */
char *filename, /* I - Filename */
char *type, /* I - File type */
struct stat *filestats) /* O - File information */
{
con->file = open(filename, O_RDONLY);
cupsdLogClient(con, CUPSD_LOG_DEBUG2, "write_file: code=%d, filename=\"%s\" (%d), type=\"%s\", filestats=%p.", code, filename, con->file, type ? type : "(null)", filestats);
if (con->file < 0)
return (0);
fcntl(con->file, F_SETFD, fcntl(con->file, F_GETFD) | FD_CLOEXEC);
con->pipe_pid = 0;
con->sent_header = 1;
httpClearFields(con->http);
httpSetLength(con->http, (size_t)filestats->st_size);
httpSetField(con->http, HTTP_FIELD_LAST_MODIFIED,
httpGetDateString(filestats->st_mtime));
if (!cupsdSendHeader(con, code, type, CUPSD_AUTH_NONE))
return (0);
cupsdAddSelect(httpGetFd(con->http), NULL, (cupsd_selfunc_t)cupsdWriteClient, con);
cupsdLogClient(con, CUPSD_LOG_DEBUG, "Sending file.");
return (1);
}
/*
* 'write_pipe()' - Flag that data is available on the CGI pipe.
*/
static void
write_pipe(cupsd_client_t *con) /* I - Client connection */
{
cupsdLogClient(con, CUPSD_LOG_DEBUG2, "write_pipe: CGI output on fd %d.", con->file);
con->file_ready = 1;
cupsdRemoveSelect(con->file);
cupsdAddSelect(httpGetFd(con->http), NULL, (cupsd_selfunc_t)cupsdWriteClient, con);
cupsdLogClient(con, CUPSD_LOG_DEBUG, "CGI data ready to be sent.");
}
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