/* * Authorization routines for the CUPS scheduler. * * Copyright © 2021-2022 by OpenPrinting. * Copyright © 2007-2019 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... */ #include "cupsd.h" #include #ifdef HAVE_SHADOW_H # include #endif /* HAVE_SHADOW_H */ #ifdef HAVE_CRYPT_H # include #endif /* HAVE_CRYPT_H */ #if HAVE_LIBPAM # ifdef HAVE_PAM_PAM_APPL_H # include # else # include # endif /* HAVE_PAM_PAM_APPL_H */ #endif /* HAVE_LIBPAM */ #ifdef HAVE_MEMBERSHIP_H # include #endif /* HAVE_MEMBERSHIP_H */ #ifdef HAVE_AUTHORIZATION_H # include #endif /* HAVE_AUTHORIZATION_H */ #ifdef HAVE_SYS_PARAM_H # include #endif /* HAVE_SYS_PARAM_H */ #ifdef HAVE_SYS_UCRED_H # include typedef struct xucred cupsd_ucred_t; # define CUPSD_UCRED_UID(c) (c).cr_uid #else # ifndef __OpenBSD__ typedef struct ucred cupsd_ucred_t; # else typedef struct sockpeercred cupsd_ucred_t; # endif # define CUPSD_UCRED_UID(c) (c).uid #endif /* HAVE_SYS_UCRED_H */ #ifdef HAVE_LIBAPPARMOR # include #endif /* HAVE_LIBAPPARMOR */ #ifdef HAVE_LIBSNAPDGLIB # include # include #endif /* HAVE_LIBSNAPDGLIB */ /* * Local functions... */ static int check_admin_access(cupsd_client_t *con); #ifdef HAVE_AUTHORIZATION_H static int check_authref(cupsd_client_t *con, const char *right); #endif /* HAVE_AUTHORIZATION_H */ static int compare_locations(cupsd_location_t *a, cupsd_location_t *b); static cupsd_authmask_t *copy_authmask(cupsd_authmask_t *am, void *data); static void free_authmask(cupsd_authmask_t *am, void *data); #if HAVE_LIBPAM static int pam_func(int, const struct pam_message **, struct pam_response **, void *); #endif /* HAVE_LIBPAM */ /* * Local structures... */ #if HAVE_LIBPAM typedef struct cupsd_authdata_s /**** Authentication data ****/ { char username[HTTP_MAX_VALUE], /* Username string */ password[HTTP_MAX_VALUE]; /* Password string */ } cupsd_authdata_t; #endif /* HAVE_LIBPAM */ /* * 'cupsdAddIPMask()' - Add an IP address authorization mask. */ int /* O - 1 on success, 0 on failure */ cupsdAddIPMask( cups_array_t **masks, /* IO - Masks array (created as needed) */ const unsigned address[4], /* I - IP address */ const unsigned netmask[4]) /* I - IP netmask */ { cupsd_authmask_t temp; /* New host/domain mask */ cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdAddIPMask(masks=%p(%p), address=%x:%x:%x:%x, netmask=%x:%x:%x:%x)", masks, *masks, address[0], address[1], address[2], address[3], netmask[0], netmask[1], netmask[2], netmask[3]); temp.type = CUPSD_AUTH_IP; memcpy(temp.mask.ip.address, address, sizeof(temp.mask.ip.address)); memcpy(temp.mask.ip.netmask, netmask, sizeof(temp.mask.ip.netmask)); /* * Create the masks array as needed and add... */ if (!*masks) *masks = cupsArrayNew3(NULL, NULL, NULL, 0, (cups_acopy_func_t)copy_authmask, (cups_afree_func_t)free_authmask); return (cupsArrayAdd(*masks, &temp)); } /* * 'cupsdAddLocation()' - Add a location for authorization. */ void cupsdAddLocation(cupsd_location_t *loc) /* I - Location to add */ { /* * Make sure the locations array is created... */ if (!Locations) Locations = cupsArrayNew3((cups_array_func_t)compare_locations, NULL, (cups_ahash_func_t)NULL, 0, (cups_acopy_func_t)NULL, (cups_afree_func_t)cupsdFreeLocation); if (Locations) { cupsArrayAdd(Locations, loc); cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdAddLocation: Added location \"%s\"", loc->location ? loc->location : "(null)"); } } /* * 'cupsdAddName()' - Add a name to a location... */ void cupsdAddName(cupsd_location_t *loc, /* I - Location to add to */ char *name) /* I - Name to add */ { cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdAddName(loc=%p, name=\"%s\")", loc, name); if (!loc->names) loc->names = cupsArrayNew3(NULL, NULL, NULL, 0, (cups_acopy_func_t)_cupsStrAlloc, (cups_afree_func_t)_cupsStrFree); if (!cupsArrayAdd(loc->names, name)) { cupsdLogMessage(CUPSD_LOG_ERROR, "Unable to duplicate name for location %s: %s", loc->location ? loc->location : "nil", strerror(errno)); return; } } /* * 'cupsdAddNameMask()' - Add a host or interface name authorization mask. */ int /* O - 1 on success, 0 on failure */ cupsdAddNameMask(cups_array_t **masks, /* IO - Masks array (created as needed) */ char *name) /* I - Host or interface name */ { cupsd_authmask_t temp; /* New host/domain mask */ char ifname[32], /* Interface name */ *ifptr; /* Pointer to end of name */ cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdAddNameMask(masks=%p(%p), name=\"%s\")", masks, *masks, name); if (!_cups_strcasecmp(name, "@LOCAL")) { /* * Deny *interface*... */ temp.type = CUPSD_AUTH_INTERFACE; temp.mask.name.name = (char *)"*"; } else if (!_cups_strncasecmp(name, "@IF(", 4)) { /* * Deny *interface*... */ strlcpy(ifname, name + 4, sizeof(ifname)); ifptr = ifname + strlen(ifname) - 1; if (ifptr >= ifname && *ifptr == ')') { *ifptr = '\0'; } temp.type = CUPSD_AUTH_INTERFACE; temp.mask.name.name = ifname; } else { /* * Deny name... */ if (*name == '*') name ++; temp.type = CUPSD_AUTH_NAME; temp.mask.name.name = (char *)name; } /* * Set the name length... */ temp.mask.name.length = strlen(temp.mask.name.name); /* * Create the masks array as needed and add... */ if (!*masks) *masks = cupsArrayNew3(NULL, NULL, NULL, 0, (cups_acopy_func_t)copy_authmask, (cups_afree_func_t)free_authmask); return (cupsArrayAdd(*masks, &temp)); } /* * 'cupsdAuthorize()' - Validate any authorization credentials. */ void cupsdAuthorize(cupsd_client_t *con) /* I - Client connection */ { int type; /* Authentication type */ const char *authorization; /* Pointer into Authorization string */ char *ptr, /* Pointer into string */ username[HTTP_MAX_VALUE], /* Username string */ password[HTTP_MAX_VALUE]; /* Password string */ cupsd_cert_t *localuser; /* Certificate username */ /* * Locate the best matching location so we know what kind of * authentication to expect... */ con->best = cupsdFindBest(con->uri, httpGetState(con->http)); con->type = CUPSD_AUTH_NONE; cupsdLogClient(con, CUPSD_LOG_DEBUG2, "con->uri=\"%s\", con->best=%p(%s)", con->uri, con->best, con->best ? con->best->location : ""); if (con->best && con->best->type != CUPSD_AUTH_NONE) { if (con->best->type == CUPSD_AUTH_DEFAULT) type = cupsdDefaultAuthType(); else type = con->best->type; } else type = cupsdDefaultAuthType(); /* * Decode the Authorization string... */ authorization = httpGetField(con->http, HTTP_FIELD_AUTHORIZATION); username[0] = '\0'; password[0] = '\0'; #ifdef HAVE_GSSAPI con->gss_uid = 0; #endif /* HAVE_GSSAPI */ #ifdef HAVE_AUTHORIZATION_H if (con->authref) { AuthorizationFree(con->authref, kAuthorizationFlagDefaults); con->authref = NULL; } #endif /* HAVE_AUTHORIZATION_H */ if (!*authorization) { /* * No authorization data provided, return early... */ cupsdLogClient(con, CUPSD_LOG_DEBUG, "No authentication data provided."); return; } #ifdef HAVE_AUTHORIZATION_H else if (!strncmp(authorization, "AuthRef ", 8) && httpAddrLocalhost(httpGetAddress(con->http))) { OSStatus status; /* Status */ char authdata[HTTP_MAX_VALUE]; /* Nonce value from client */ int authlen; /* Auth string length */ AuthorizationItemSet *authinfo; /* Authorization item set */ /* * Get the Authorization Services data... */ authorization += 8; while (isspace(*authorization & 255)) authorization ++; authlen = sizeof(authdata); httpDecode64_2(authdata, &authlen, authorization); if (authlen != kAuthorizationExternalFormLength) { cupsdLogClient(con, CUPSD_LOG_ERROR, "External Authorization reference size is incorrect."); return; } if ((status = AuthorizationCreateFromExternalForm((AuthorizationExternalForm *)authdata, &con->authref)) != 0) { cupsdLogClient(con, CUPSD_LOG_ERROR, "AuthorizationCreateFromExternalForm returned %d", (int)status); return; } username[0] = '\0'; if (!AuthorizationCopyInfo(con->authref, kAuthorizationEnvironmentUsername, &authinfo)) { if (authinfo->count == 1 && authinfo->items[0].value && authinfo->items[0].valueLength >= 2) { strlcpy(username, authinfo->items[0].value, sizeof(username)); cupsdLogClient(con, CUPSD_LOG_DEBUG, "Authorized as \"%s\" using AuthRef.", username); } AuthorizationFreeItemSet(authinfo); } if (!username[0]) { /* * No username in AuthRef, grab username using peer credentials... */ struct passwd *pwd; /* Password entry for this user */ cupsd_ucred_t peercred; /* Peer credentials */ socklen_t peersize; /* Size of peer credentials */ peersize = sizeof(peercred); if (getsockopt(httpGetFd(con->http), 0, LOCAL_PEERCRED, &peercred, &peersize)) { cupsdLogClient(con, CUPSD_LOG_ERROR, "Unable to get peer credentials - %s", strerror(errno)); return; } if ((pwd = getpwuid(CUPSD_UCRED_UID(peercred))) == NULL) { cupsdLogClient(con, CUPSD_LOG_ERROR, "Unable to find UID %d for peer credentials.", (int)CUPSD_UCRED_UID(peercred)); return; } strlcpy(username, pwd->pw_name, sizeof(username)); cupsdLogClient(con, CUPSD_LOG_DEBUG, "Authorized as \"%s\" using AuthRef + PeerCred.", username); } con->type = CUPSD_AUTH_BASIC; } #endif /* HAVE_AUTHORIZATION_H */ #if defined(SO_PEERCRED) && defined(AF_LOCAL) else if (!strncmp(authorization, "PeerCred ", 9) && con->http->hostaddr->addr.sa_family == AF_LOCAL && con->best) { /* * Use peer credentials from domain socket connection... */ struct passwd *pwd; /* Password entry for this user */ cupsd_ucred_t peercred; /* Peer credentials */ socklen_t peersize; /* Size of peer credentials */ #ifdef HAVE_AUTHORIZATION_H const char *name; /* Authorizing name */ int no_peer = 0; /* Don't allow peer credentials? */ /* * See if we should allow peer credentials... */ for (name = (char *)cupsArrayFirst(con->best->names); name; name = (char *)cupsArrayNext(con->best->names)) { if (!_cups_strncasecmp(name, "@AUTHKEY(", 9) || !_cups_strcasecmp(name, "@SYSTEM")) { /* Normally don't want peer credentials if we need an auth key... */ no_peer = 1; } else if (!_cups_strcasecmp(name, "@OWNER")) { /* but if @OWNER is present then we allow it... */ no_peer = 0; break; } } if (no_peer) { cupsdLogClient(con, CUPSD_LOG_ERROR, "PeerCred authentication not allowed for resource per AUTHKEY policy."); return; } #endif /* HAVE_AUTHORIZATION_H */ if ((pwd = getpwnam(authorization + 9)) == NULL) { cupsdLogClient(con, CUPSD_LOG_ERROR, "User \"%s\" does not exist.", authorization + 9); return; } peersize = sizeof(peercred); # ifdef __APPLE__ if (getsockopt(httpGetFd(con->http), 0, LOCAL_PEERCRED, &peercred, &peersize)) # else if (getsockopt(httpGetFd(con->http), SOL_SOCKET, SO_PEERCRED, &peercred, &peersize)) # endif /* __APPLE__ */ { cupsdLogClient(con, CUPSD_LOG_ERROR, "Unable to get peer credentials - %s", strerror(errno)); return; } if (pwd->pw_uid != CUPSD_UCRED_UID(peercred)) { cupsdLogClient(con, CUPSD_LOG_ERROR, "Invalid peer credentials for \"%s\" - got %d, expected %d.", authorization + 9, CUPSD_UCRED_UID(peercred), pwd->pw_uid); # ifdef HAVE_SYS_UCRED_H cupsdLogClient(con, CUPSD_LOG_DEBUG2, "cr_version=%d", peercred.cr_version); cupsdLogClient(con, CUPSD_LOG_DEBUG2, "cr_uid=%d", peercred.cr_uid); cupsdLogClient(con, CUPSD_LOG_DEBUG2, "cr_ngroups=%d", peercred.cr_ngroups); cupsdLogClient(con, CUPSD_LOG_DEBUG2, "cr_groups[0]=%d", peercred.cr_groups[0]); # endif /* HAVE_SYS_UCRED_H */ return; } strlcpy(username, authorization + 9, sizeof(username)); # ifdef HAVE_GSSAPI con->gss_uid = CUPSD_UCRED_UID(peercred); # endif /* HAVE_GSSAPI */ cupsdLogClient(con, CUPSD_LOG_DEBUG, "Authorized as %s using PeerCred.", username); con->type = CUPSD_AUTH_BASIC; } #endif /* SO_PEERCRED && AF_LOCAL */ else if (!strncmp(authorization, "Local", 5) && httpAddrLocalhost(httpGetAddress(con->http))) { /* * Get Local certificate authentication data... */ authorization += 5; while (isspace(*authorization & 255)) authorization ++; if ((localuser = cupsdFindCert(authorization)) == NULL) { cupsdLogClient(con, CUPSD_LOG_ERROR, "Local authentication certificate not found."); return; } strlcpy(username, localuser->username, sizeof(username)); con->type = localuser->type; cupsdLogClient(con, CUPSD_LOG_DEBUG, "Authorized as %s using Local.", username); } else if (!strncmp(authorization, "Basic", 5)) { /* * Get the Basic authentication data... */ int userlen; /* Username:password length */ authorization += 5; while (isspace(*authorization & 255)) authorization ++; userlen = sizeof(username); httpDecode64_2(username, &userlen, authorization); /* * Pull the username and password out... */ if ((ptr = strchr(username, ':')) == NULL) { cupsdLogClient(con, CUPSD_LOG_ERROR, "Missing Basic password."); return; } *ptr++ = '\0'; if (!username[0]) { /* * Username must not be empty... */ cupsdLogClient(con, CUPSD_LOG_ERROR, "Empty Basic username."); return; } if (!*ptr) { /* * Password must not be empty... */ cupsdLogClient(con, CUPSD_LOG_ERROR, "Empty Basic password."); return; } strlcpy(password, ptr, sizeof(password)); /* * Validate the username and password... */ switch (type) { default : case CUPSD_AUTH_BASIC : { #if HAVE_LIBPAM /* * Only use PAM to do authentication. This supports MD5 * passwords, among other things... */ pam_handle_t *pamh; /* PAM authentication handle */ int pamerr; /* PAM error code */ struct pam_conv pamdata;/* PAM conversation data */ cupsd_authdata_t data; /* Authentication data */ strlcpy(data.username, username, sizeof(data.username)); strlcpy(data.password, password, sizeof(data.password)); # ifdef __sun pamdata.conv = (int (*)(int, struct pam_message **, struct pam_response **, void *))pam_func; # else pamdata.conv = pam_func; # endif /* __sun */ pamdata.appdata_ptr = &data; pamerr = pam_start("cups", username, &pamdata, &pamh); if (pamerr != PAM_SUCCESS) { cupsdLogClient(con, CUPSD_LOG_ERROR, "pam_start() returned %d (%s)", pamerr, pam_strerror(pamh, pamerr)); return; } # ifdef HAVE_PAM_SET_ITEM # ifdef PAM_RHOST pamerr = pam_set_item(pamh, PAM_RHOST, con->http->hostname); if (pamerr != PAM_SUCCESS) cupsdLogClient(con, CUPSD_LOG_WARN, "pam_set_item(PAM_RHOST) returned %d (%s)", pamerr, pam_strerror(pamh, pamerr)); # endif /* PAM_RHOST */ # ifdef PAM_TTY pamerr = pam_set_item(pamh, PAM_TTY, "cups"); if (pamerr != PAM_SUCCESS) cupsdLogClient(con, CUPSD_LOG_WARN, "pam_set_item(PAM_TTY) returned %d (%s)", pamerr, pam_strerror(pamh, pamerr)); # endif /* PAM_TTY */ # endif /* HAVE_PAM_SET_ITEM */ pamerr = pam_authenticate(pamh, PAM_SILENT); if (pamerr != PAM_SUCCESS) { cupsdLogClient(con, CUPSD_LOG_ERROR, "pam_authenticate() returned %d (%s)", pamerr, pam_strerror(pamh, pamerr)); pam_end(pamh, 0); return; } # ifdef HAVE_PAM_SETCRED pamerr = pam_setcred(pamh, PAM_ESTABLISH_CRED | PAM_SILENT); if (pamerr != PAM_SUCCESS) cupsdLogClient(con, CUPSD_LOG_WARN, "pam_setcred() returned %d (%s)", pamerr, pam_strerror(pamh, pamerr)); # endif /* HAVE_PAM_SETCRED */ pamerr = pam_acct_mgmt(pamh, PAM_SILENT); if (pamerr != PAM_SUCCESS) { cupsdLogClient(con, CUPSD_LOG_ERROR, "pam_acct_mgmt() returned %d (%s)", pamerr, pam_strerror(pamh, pamerr)); pam_end(pamh, 0); return; } pam_end(pamh, PAM_SUCCESS); #else /* * Use normal UNIX password file-based authentication... */ char *pass; /* Encrypted password */ struct passwd *pw; /* User password data */ # ifdef HAVE_SHADOW_H struct spwd *spw; /* Shadow password data */ # endif /* HAVE_SHADOW_H */ pw = getpwnam(username); /* Get the current password */ endpwent(); /* Close the password file */ if (!pw) { /* * No such user... */ cupsdLogClient(con, CUPSD_LOG_ERROR, "Unknown username \"%s\".", username); return; } # ifdef HAVE_SHADOW_H spw = getspnam(username); endspent(); if (!spw && !strcmp(pw->pw_passwd, "x")) { /* * Don't allow blank passwords! */ cupsdLogClient(con, CUPSD_LOG_ERROR, "Username \"%s\" has no shadow password.", username); return; } if (spw && !spw->sp_pwdp[0] && !pw->pw_passwd[0]) # else if (!pw->pw_passwd[0]) # endif /* HAVE_SHADOW_H */ { /* * Don't allow blank passwords! */ cupsdLogClient(con, CUPSD_LOG_ERROR, "Username \"%s\" has no password.", username); return; } /* * OK, the password isn't blank, so compare with what came from the * client... */ pass = crypt(password, pw->pw_passwd); if (!pass || strcmp(pw->pw_passwd, pass)) { # ifdef HAVE_SHADOW_H if (spw) { pass = crypt(password, spw->sp_pwdp); if (pass == NULL || strcmp(spw->sp_pwdp, pass)) { cupsdLogClient(con, CUPSD_LOG_ERROR, "Authentication failed for user \"%s\".", username); return; } } else # endif /* HAVE_SHADOW_H */ { cupsdLogClient(con, CUPSD_LOG_ERROR, "Authentication failed for user \"%s\".", username); return; } } #endif /* HAVE_LIBPAM */ } cupsdLogClient(con, CUPSD_LOG_DEBUG, "Authorized as \"%s\" using Basic.", username); break; } con->type = type; } #ifdef HAVE_GSSAPI else if (!strncmp(authorization, "Negotiate", 9)) { int len; /* Length of authorization string */ gss_ctx_id_t context; /* Authorization context */ OM_uint32 major_status, /* Major status code */ minor_status; /* Minor status code */ gss_buffer_desc input_token = GSS_C_EMPTY_BUFFER, /* Input token from string */ output_token = GSS_C_EMPTY_BUFFER; /* Output token for username */ gss_name_t client_name; /* Client name */ # ifdef __APPLE__ /* * If the weak-linked GSSAPI/Kerberos library is not present, don't try * to use it... */ if (&gss_init_sec_context == NULL) { cupsdLogClient(con, CUPSD_LOG_WARN, "GSSAPI/Kerberos authentication failed because the Kerberos framework is not present."); return; } # endif /* __APPLE__ */ /* * Find the start of the Kerberos input token... */ authorization += 9; while (isspace(*authorization & 255)) authorization ++; if (!*authorization) { cupsdLogClient(con, CUPSD_LOG_DEBUG2, "No authentication data specified."); return; } /* * Decode the authorization string to get the input token... */ len = (int)strlen(authorization) + 0; input_token.value = malloc((size_t)len); input_token.value = httpDecode64_2(input_token.value, &len, authorization); input_token.length = (size_t)len; /* * Accept the input token to get the authorization info... */ context = GSS_C_NO_CONTEXT; client_name = GSS_C_NO_NAME; major_status = gss_accept_sec_context(&minor_status, &context, ServerCreds, &input_token, GSS_C_NO_CHANNEL_BINDINGS, &client_name, NULL, &output_token, NULL, NULL, NULL); if (output_token.length > 0) gss_release_buffer(&minor_status, &output_token); if (GSS_ERROR(major_status)) { cupsdLogGSSMessage(CUPSD_LOG_DEBUG, major_status, minor_status, "[Client %d] Error accepting GSSAPI security context.", con->number); if (context != GSS_C_NO_CONTEXT) gss_delete_sec_context(&minor_status, &context, GSS_C_NO_BUFFER); return; } con->have_gss = 1; /* * Get the username associated with the client's credentials... */ if (major_status == GSS_S_CONTINUE_NEEDED) cupsdLogGSSMessage(CUPSD_LOG_DEBUG, major_status, minor_status, "[Client %d] Credentials not complete.", con->number); else if (major_status == GSS_S_COMPLETE) { major_status = gss_display_name(&minor_status, client_name, &output_token, NULL); if (GSS_ERROR(major_status)) { cupsdLogGSSMessage(CUPSD_LOG_DEBUG, major_status, minor_status, "[Client %d] Error getting username.", con->number); gss_release_name(&minor_status, &client_name); gss_delete_sec_context(&minor_status, &context, GSS_C_NO_BUFFER); return; } strlcpy(username, output_token.value, sizeof(username)); cupsdLogClient(con, CUPSD_LOG_DEBUG, "Authorized as \"%s\" using Negotiate.", username); gss_release_name(&minor_status, &client_name); gss_release_buffer(&minor_status, &output_token); con->type = CUPSD_AUTH_NEGOTIATE; } gss_delete_sec_context(&minor_status, &context, GSS_C_NO_BUFFER); # if defined(SO_PEERCRED) && defined(AF_LOCAL) /* * Get the client's UID if we are printing locally - that allows a backend * to run as the correct user to get Kerberos credentials of its own. */ if (httpAddrFamily(con->http->hostaddr) == AF_LOCAL) { cupsd_ucred_t peercred; /* Peer credentials */ socklen_t peersize; /* Size of peer credentials */ peersize = sizeof(peercred); # ifdef __APPLE__ if (getsockopt(httpGetFd(con->http), 0, LOCAL_PEERCRED, &peercred, &peersize)) # else if (getsockopt(httpGetFd(con->http), SOL_SOCKET, SO_PEERCRED, &peercred, &peersize)) # endif /* __APPLE__ */ { cupsdLogClient(con, CUPSD_LOG_ERROR, "Unable to get peer credentials - %s", strerror(errno)); } else { cupsdLogClient(con, CUPSD_LOG_DEBUG, "Using credentials for UID %d.", CUPSD_UCRED_UID(peercred)); con->gss_uid = CUPSD_UCRED_UID(peercred); } } # endif /* SO_PEERCRED && AF_LOCAL */ } #endif /* HAVE_GSSAPI */ else { char scheme[256]; /* Auth scheme... */ if (sscanf(authorization, "%255s", scheme) != 1) strlcpy(scheme, "UNKNOWN", sizeof(scheme)); cupsdLogClient(con, CUPSD_LOG_ERROR, "Bad authentication data \"%s ...\".", scheme); return; } /* * If we get here, then we were able to validate the username and * password - copy the validated username and password to the client * data and return... */ strlcpy(con->username, username, sizeof(con->username)); strlcpy(con->password, password, sizeof(con->password)); } /* * 'cupsdCheckAccess()' - Check whether the given address is allowed to * access a location. */ int /* O - 1 if allowed, 0 otherwise */ cupsdCheckAccess( unsigned ip[4], /* I - Client address */ const char *name, /* I - Client hostname */ size_t namelen, /* I - Length of hostname */ cupsd_location_t *loc) /* I - Location to check */ { int allow; /* 1 if allowed, 0 otherwise */ if (!_cups_strcasecmp(name, "localhost")) { /* * Access from localhost (127.0.0.1 or ::1) is always allowed... */ return (1); } else { /* * Do authorization checks on the domain/address... */ switch (loc->order_type) { default : allow = 0; /* anti-compiler-warning-code */ break; case CUPSD_AUTH_ALLOW : /* Order Deny,Allow */ allow = 1; if (cupsdCheckAuth(ip, name, namelen, loc->deny)) allow = 0; if (cupsdCheckAuth(ip, name, namelen, loc->allow)) allow = 1; break; case CUPSD_AUTH_DENY : /* Order Allow,Deny */ allow = 0; if (cupsdCheckAuth(ip, name, namelen, loc->allow)) allow = 1; if (cupsdCheckAuth(ip, name, namelen, loc->deny)) allow = 0; break; } } return (allow); } /* * 'cupsdCheckAuth()' - Check authorization masks. */ int /* O - 1 if mask matches, 0 otherwise */ cupsdCheckAuth(unsigned ip[4], /* I - Client address */ const char *name, /* I - Client hostname */ size_t name_len, /* I - Length of hostname */ cups_array_t *masks) /* I - Masks */ { int i; /* Looping var */ cupsd_authmask_t *mask; /* Current mask */ cupsd_netif_t *iface; /* Network interface */ unsigned netip4; /* IPv4 network address */ #ifdef AF_INET6 unsigned netip6[4]; /* IPv6 network address */ #endif /* AF_INET6 */ for (mask = (cupsd_authmask_t *)cupsArrayFirst(masks); mask; mask = (cupsd_authmask_t *)cupsArrayNext(masks)) { switch (mask->type) { case CUPSD_AUTH_INTERFACE : /* * Check for a match with a network interface... */ netip4 = htonl(ip[3]); #ifdef AF_INET6 netip6[0] = htonl(ip[0]); netip6[1] = htonl(ip[1]); netip6[2] = htonl(ip[2]); netip6[3] = htonl(ip[3]); #endif /* AF_INET6 */ cupsdNetIFUpdate(); if (!strcmp(mask->mask.name.name, "*")) { #ifdef __APPLE__ /* * Allow Back-to-My-Mac addresses... */ if ((ip[0] & 0xff000000) == 0xfd000000) return (1); #endif /* __APPLE__ */ /* * Check against all local interfaces... */ for (iface = (cupsd_netif_t *)cupsArrayFirst(NetIFList); iface; iface = (cupsd_netif_t *)cupsArrayNext(NetIFList)) { /* * Only check local interfaces... */ if (!iface->is_local) continue; if (iface->address.addr.sa_family == AF_INET) { /* * Check IPv4 address... */ if ((netip4 & iface->mask.ipv4.sin_addr.s_addr) == (iface->address.ipv4.sin_addr.s_addr & iface->mask.ipv4.sin_addr.s_addr)) return (1); } #ifdef AF_INET6 else { /* * Check IPv6 address... */ for (i = 0; i < 4; i ++) if ((netip6[i] & iface->mask.ipv6.sin6_addr.s6_addr32[i]) != (iface->address.ipv6.sin6_addr.s6_addr32[i] & iface->mask.ipv6.sin6_addr.s6_addr32[i])) break; if (i == 4) return (1); } #endif /* AF_INET6 */ } } else { /* * Check the named interface... */ for (iface = (cupsd_netif_t *)cupsArrayFirst(NetIFList); iface; iface = (cupsd_netif_t *)cupsArrayNext(NetIFList)) { if (strcmp(mask->mask.name.name, iface->name)) continue; if (iface->address.addr.sa_family == AF_INET) { /* * Check IPv4 address... */ if ((netip4 & iface->mask.ipv4.sin_addr.s_addr) == (iface->address.ipv4.sin_addr.s_addr & iface->mask.ipv4.sin_addr.s_addr)) return (1); } #ifdef AF_INET6 else { /* * Check IPv6 address... */ for (i = 0; i < 4; i ++) if ((netip6[i] & iface->mask.ipv6.sin6_addr.s6_addr32[i]) != (iface->address.ipv6.sin6_addr.s6_addr32[i] & iface->mask.ipv6.sin6_addr.s6_addr32[i])) break; if (i == 4) return (1); } #endif /* AF_INET6 */ } } break; case CUPSD_AUTH_NAME : /* * Check for exact name match... */ if (!_cups_strcasecmp(name, mask->mask.name.name)) return (1); /* * Check for domain match... */ if (name_len >= mask->mask.name.length && mask->mask.name.name[0] == '.' && !_cups_strcasecmp(name + name_len - mask->mask.name.length, mask->mask.name.name)) return (1); break; case CUPSD_AUTH_IP : /* * Check for IP/network address match... */ for (i = 0; i < 4; i ++) if ((ip[i] & mask->mask.ip.netmask[i]) != mask->mask.ip.address[i]) break; if (i == 4) return (1); break; } } return (0); } /* * 'cupsdCheckGroup()' - Check for a user's group membership. */ int /* O - 1 if user is a member, 0 otherwise */ cupsdCheckGroup( const char *username, /* I - User name */ struct passwd *user, /* I - System user info */ const char *groupname) /* I - Group name */ { int i; /* Looping var */ struct group *group; /* Group info */ gid_t groupid; /* ID of named group */ #ifdef HAVE_MBR_UID_TO_UUID uuid_t useruuid, /* UUID for username */ groupuuid; /* UUID for groupname */ int is_member; /* True if user is a member of group */ #endif /* HAVE_MBR_UID_TO_UUID */ cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdCheckGroup(username=\"%s\", user=%p, groupname=\"%s\")", username, user, groupname); /* * Validate input... */ if (!username || !groupname) return (0); /* * Check to see if the user is a member of the named group... */ group = getgrnam(groupname); endgrent(); if (group != NULL) { /* * Group exists, check it... */ groupid = group->gr_gid; for (i = 0; group->gr_mem[i]; i ++) { /* * User appears in the group membership... */ if (!_cups_strcasecmp(username, group->gr_mem[i])) return (1); } #ifdef HAVE_GETGROUPLIST /* * If the user isn't in the group membership list, try the results from * getgrouplist() which is supposed to return the full list of groups a user * belongs to... */ if (user) { int ngroups; /* Number of groups */ # ifdef __APPLE__ int groups[2048]; /* Groups that user belongs to */ # else gid_t groups[2048]; /* Groups that user belongs to */ # endif /* __APPLE__ */ ngroups = (int)(sizeof(groups) / sizeof(groups[0])); # ifdef __APPLE__ getgrouplist(username, (int)user->pw_gid, groups, &ngroups); # else getgrouplist(username, user->pw_gid, groups, &ngroups); #endif /* __APPLE__ */ for (i = 0; i < ngroups; i ++) if ((int)groupid == (int)groups[i]) return (1); } #endif /* HAVE_GETGROUPLIST */ } else groupid = (gid_t)-1; /* * Group doesn't exist or user not in group list, check the group ID * against the user's group ID... */ if (user && groupid == user->pw_gid) return (1); #ifdef HAVE_MBR_UID_TO_UUID /* * Check group membership through macOS membership API... */ if (user && !mbr_uid_to_uuid(user->pw_uid, useruuid)) { if (groupid != (gid_t)-1) { /* * Map group name to UUID and check membership... */ if (!mbr_gid_to_uuid(groupid, groupuuid)) if (!mbr_check_membership(useruuid, groupuuid, &is_member)) if (is_member) return (1); } else if (groupname[0] == '#') { /* * Use UUID directly and check for equality (user UUID) and * membership (group UUID)... */ if (!uuid_parse((char *)groupname + 1, groupuuid)) { if (!uuid_compare(useruuid, groupuuid)) return (1); else if (!mbr_check_membership(useruuid, groupuuid, &is_member)) if (is_member) return (1); } return (0); } } else if (groupname[0] == '#') return (0); #endif /* HAVE_MBR_UID_TO_UUID */ /* * If we get this far, then the user isn't part of the named group... */ return (0); } /* * 'cupsdCopyLocation()' - Make a copy of a location... */ cupsd_location_t * /* O - New location */ cupsdCopyLocation( cupsd_location_t *loc) /* I - Original location */ { cupsd_location_t *temp; /* New location */ /* * Make a copy of the original location... */ if ((temp = calloc(1, sizeof(cupsd_location_t))) == NULL) return (NULL); /* * Copy the information from the original location to the new one. */ if (!loc) return (temp); if (loc->location) temp->location = _cupsStrAlloc(loc->location); temp->length = loc->length; temp->limit = loc->limit; temp->order_type = loc->order_type; temp->type = loc->type; temp->level = loc->level; temp->satisfy = loc->satisfy; temp->encryption = loc->encryption; if (loc->names) { if ((temp->names = cupsArrayDup(loc->names)) == NULL) { cupsdLogMessage(CUPSD_LOG_ERROR, "Unable to allocate memory for %d names: %s", cupsArrayCount(loc->names), strerror(errno)); cupsdFreeLocation(temp); return (NULL); } } if (loc->allow) { /* * Copy allow rules... */ if ((temp->allow = cupsArrayDup(loc->allow)) == NULL) { cupsdLogMessage(CUPSD_LOG_ERROR, "Unable to allocate memory for %d allow rules: %s", cupsArrayCount(loc->allow), strerror(errno)); cupsdFreeLocation(temp); return (NULL); } } if (loc->deny) { /* * Copy deny rules... */ if ((temp->deny = cupsArrayDup(loc->deny)) == NULL) { cupsdLogMessage(CUPSD_LOG_ERROR, "Unable to allocate memory for %d deny rules: %s", cupsArrayCount(loc->deny), strerror(errno)); cupsdFreeLocation(temp); return (NULL); } } return (temp); } /* * 'cupsdDeleteAllLocations()' - Free all memory used for location authorization. */ void cupsdDeleteAllLocations(void) { /* * Free the location array, which will free all of the locations... */ cupsArrayDelete(Locations); Locations = NULL; } /* * 'cupsdFindBest()' - Find the location entry that best matches the resource. */ cupsd_location_t * /* O - Location that matches */ cupsdFindBest(const char *path, /* I - Resource path */ http_state_t state) /* I - HTTP state/request */ { char uri[HTTP_MAX_URI], /* URI in request... */ *uriptr; /* Pointer into URI */ cupsd_location_t *loc, /* Current location */ *best; /* Best match for location so far */ size_t bestlen; /* Length of best match */ int limit; /* Limit field */ static const int limits[] = /* Map http_status_t to CUPSD_AUTH_LIMIT_xyz */ { CUPSD_AUTH_LIMIT_ALL, CUPSD_AUTH_LIMIT_OPTIONS, CUPSD_AUTH_LIMIT_GET, CUPSD_AUTH_LIMIT_GET, CUPSD_AUTH_LIMIT_HEAD, CUPSD_AUTH_LIMIT_POST, CUPSD_AUTH_LIMIT_POST, CUPSD_AUTH_LIMIT_POST, CUPSD_AUTH_LIMIT_PUT, CUPSD_AUTH_LIMIT_PUT, CUPSD_AUTH_LIMIT_DELETE, CUPSD_AUTH_LIMIT_TRACE, CUPSD_AUTH_LIMIT_ALL, CUPSD_AUTH_LIMIT_ALL, CUPSD_AUTH_LIMIT_ALL, CUPSD_AUTH_LIMIT_ALL }; /* * First copy the connection URI to a local string so we have drop * any .ppd extension from the pathname in /printers or /classes * URIs... */ strlcpy(uri, path, sizeof(uri)); if ((uriptr = strchr(uri, '?')) != NULL) *uriptr = '\0'; /* Drop trailing query string */ if ((uriptr = uri + strlen(uri) - 1) > uri && *uriptr == '/') *uriptr = '\0'; /* Remove trailing '/' */ if (!strncmp(uri, "/printers/", 10) || !strncmp(uri, "/classes/", 9)) { /* * Check if the URI has .ppd on the end... */ uriptr = uri + strlen(uri) - 4; /* len > 4 if we get here... */ if (!strcmp(uriptr, ".ppd")) *uriptr = '\0'; } /* * Loop through the list of locations to find a match... */ limit = limits[state]; best = NULL; bestlen = 0; cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdFindBest: uri=\"%s\", limit=%x...", uri, limit); for (loc = (cupsd_location_t *)cupsArrayFirst(Locations); loc; loc = (cupsd_location_t *)cupsArrayNext(Locations)) { cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdFindBest: Location %s(%d) Limit %x", loc->location ? loc->location : "(null)", (int)loc->length, loc->limit); if (!strncmp(uri, "/printers/", 10) || !strncmp(uri, "/classes/", 9)) { /* * Use case-insensitive comparison for queue names... */ if (loc->length > bestlen && loc->location && !_cups_strncasecmp(uri, loc->location, loc->length) && loc->location[0] == '/' && (limit & loc->limit) != 0) { best = loc; bestlen = loc->length; } } else { /* * Use case-sensitive comparison for other URIs... */ if (loc->length > bestlen && loc->location && !strncmp(uri, loc->location, loc->length) && loc->location[0] == '/' && (limit & loc->limit) != 0) { best = loc; bestlen = loc->length; } } } /* * Return the match, if any... */ cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdFindBest: best=%s", best ? best->location : "NONE"); return (best); } /* * 'cupsdFindLocation()' - Find the named location. */ cupsd_location_t * /* O - Location that matches */ cupsdFindLocation(const char *location) /* I - Connection */ { cupsd_location_t key; /* Search key */ key.location = (char *)location; return ((cupsd_location_t *)cupsArrayFind(Locations, &key)); } /* * 'cupsdFreeLocation()' - Free all memory used by a location. */ void cupsdFreeLocation(cupsd_location_t *loc)/* I - Location to free */ { cupsArrayDelete(loc->names); cupsArrayDelete(loc->allow); cupsArrayDelete(loc->deny); _cupsStrFree(loc->location); free(loc); } /* * 'cupsdIsAuthorized()' - Check to see if the user is authorized... */ http_status_t /* O - HTTP_OK if authorized or error code */ cupsdIsAuthorized(cupsd_client_t *con, /* I - Connection */ const char *owner)/* I - Owner of object */ { int i, /* Looping vars */ auth, /* Authorization status */ type; /* Type of authentication */ http_addr_t *hostaddr = httpGetAddress(con->http); /* Client address */ const char *hostname = httpGetHostname(con->http, NULL, 0); /* Client hostname */ unsigned address[4]; /* Authorization address */ cupsd_location_t *best; /* Best match for location so far */ size_t hostlen; /* Length of hostname */ char *name, /* Current username */ username[256], /* Username to authorize */ ownername[256], /* Owner name to authorize */ *ptr; /* Pointer into username */ struct passwd *pw; /* User password data */ static const char * const levels[] = /* Auth levels */ { "ANON", "USER", "GROUP" }; static const char * const types[] = /* Auth types */ { "None", "Basic", "Negotiate" }; cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdIsAuthorized: con->uri=\"%s\", con->best=%p(%s)", con->uri, con->best, con->best ? con->best->location ? con->best->location : "(null)" : ""); if (owner) cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdIsAuthorized: owner=\"%s\"", owner); /* * If there is no "best" authentication rule for this request, then * access is allowed from the local system and denied from other * addresses... */ if (!con->best) { if (httpAddrLocalhost(httpGetAddress(con->http)) || !strcmp(hostname, ServerName) || cupsArrayFind(ServerAlias, (void *)hostname)) return (HTTP_OK); else return (HTTP_FORBIDDEN); } best = con->best; if ((type = best->type) == CUPSD_AUTH_DEFAULT) type = cupsdDefaultAuthType(); cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdIsAuthorized: level=CUPSD_AUTH_%s, type=%s, satisfy=CUPSD_AUTH_SATISFY_%s, num_names=%d", levels[best->level], types[type], best->satisfy ? "ANY" : "ALL", cupsArrayCount(best->names)); if (best->limit == CUPSD_AUTH_LIMIT_IPP) cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdIsAuthorized: op=%x(%s)", best->op, ippOpString(best->op)); /* * Check host/ip-based accesses... */ #ifdef AF_INET6 if (httpAddrFamily(hostaddr) == AF_INET6) { /* * Copy IPv6 address... */ address[0] = ntohl(hostaddr->ipv6.sin6_addr.s6_addr32[0]); address[1] = ntohl(hostaddr->ipv6.sin6_addr.s6_addr32[1]); address[2] = ntohl(hostaddr->ipv6.sin6_addr.s6_addr32[2]); address[3] = ntohl(hostaddr->ipv6.sin6_addr.s6_addr32[3]); } else #endif /* AF_INET6 */ if (con->http->hostaddr->addr.sa_family == AF_INET) { /* * Copy IPv4 address... */ address[0] = 0; address[1] = 0; address[2] = 0; address[3] = ntohl(hostaddr->ipv4.sin_addr.s_addr); } else memset(address, 0, sizeof(address)); hostlen = strlen(hostname); auth = cupsdCheckAccess(address, hostname, hostlen, best) ? CUPSD_AUTH_ALLOW : CUPSD_AUTH_DENY; cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdIsAuthorized: auth=CUPSD_AUTH_%s...", auth ? "DENY" : "ALLOW"); if (auth == CUPSD_AUTH_DENY && best->satisfy == CUPSD_AUTH_SATISFY_ALL) return (HTTP_FORBIDDEN); #ifdef HAVE_TLS /* * See if encryption is required... */ if ((best->encryption >= HTTP_ENCRYPT_REQUIRED && !con->http->tls && _cups_strcasecmp(hostname, "localhost") && !httpAddrLocalhost(hostaddr) && best->satisfy == CUPSD_AUTH_SATISFY_ALL) && !(type == CUPSD_AUTH_NEGOTIATE || (type == CUPSD_AUTH_NONE && cupsdDefaultAuthType() == CUPSD_AUTH_NEGOTIATE))) { cupsdLogMessage(CUPSD_LOG_DEBUG, "cupsdIsAuthorized: Need upgrade to TLS..."); return (HTTP_UPGRADE_REQUIRED); } #endif /* HAVE_TLS */ /* * Now see what access level is required... */ if (best->level == CUPSD_AUTH_ANON || /* Anonymous access - allow it */ (type == CUPSD_AUTH_NONE && cupsArrayCount(best->names) == 0)) return (HTTP_OK); if (!con->username[0] && type == CUPSD_AUTH_NONE && best->limit == CUPSD_AUTH_LIMIT_IPP) { /* * Check for unauthenticated username... */ ipp_attribute_t *attr; /* requesting-user-name attribute */ attr = ippFindAttribute(con->request, "requesting-user-name", IPP_TAG_NAME); if (attr) { cupsdLogMessage(CUPSD_LOG_DEBUG, "cupsdIsAuthorized: requesting-user-name=\"%s\"", attr->values[0].string.text); strlcpy(username, attr->values[0].string.text, sizeof(username)); } else if (best->satisfy == CUPSD_AUTH_SATISFY_ALL || auth == CUPSD_AUTH_DENY) return (HTTP_UNAUTHORIZED); /* Non-anonymous needs user/pass */ else return (HTTP_OK); /* unless overridden with Satisfy */ } else { cupsdLogMessage(CUPSD_LOG_DEBUG, "cupsdIsAuthorized: username=\"%s\"", con->username); #ifdef HAVE_AUTHORIZATION_H if (!con->username[0] && !con->authref) #else if (!con->username[0]) #endif /* HAVE_AUTHORIZATION_H */ { if (best->satisfy == CUPSD_AUTH_SATISFY_ALL || auth == CUPSD_AUTH_DENY) return (HTTP_UNAUTHORIZED); /* Non-anonymous needs user/pass */ else return (HTTP_OK); /* unless overridden with Satisfy */ } if (con->type != type && type != CUPSD_AUTH_NONE && #ifdef HAVE_GSSAPI (type != CUPSD_AUTH_NEGOTIATE || con->gss_uid <= 0) && #endif /* HAVE_GSSAPI */ con->type != CUPSD_AUTH_BASIC) { cupsdLogMessage(CUPSD_LOG_ERROR, "Authorized using %s, expected %s.", types[con->type], types[type]); return (HTTP_UNAUTHORIZED); } strlcpy(username, con->username, sizeof(username)); } /* * OK, got a username. See if we need normal user access, or group * access... */ /* * Strip any @domain or @KDC from the username and owner... */ if ((ptr = strchr(username, '@')) != NULL) *ptr = '\0'; if (owner) { strlcpy(ownername, owner, sizeof(ownername)); if ((ptr = strchr(ownername, '@')) != NULL) *ptr = '\0'; } else ownername[0] = '\0'; /* * Get the user info... */ if (username[0]) { pw = getpwnam(username); endpwent(); } else pw = NULL; /* * For matching user and group memberships below we will first go * through all names except @SYSTEM to authorize the task as * non-administrative, like printing or deleting one's own job, if this * fails we will check whether we can authorize via the special name * @SYSTEM, as an administrative task, like creating a print queue or * deleting someone else's job. * Note that tasks are considered as administrative by the policies * in cupsd.conf, when they require the user or group @SYSTEM. * We do this separation because if the client is a Snap connecting via * domain socket, we need to additionally check whether it plugs to us * through the "cups-control" interface which allows administration and * not through the "cups" interface which allows only printing. */ if (best->level == CUPSD_AUTH_USER) { /* * If there are no names associated with this location, then * any valid user is OK... */ if (cupsArrayCount(best->names) == 0) return (HTTP_OK); /* * Otherwise check the user list and return OK if this user is * allowed... */ cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdIsAuthorized: Checking user membership..."); #ifdef HAVE_AUTHORIZATION_H /* * If an authorization reference was supplied it must match a right name... */ if (con->authref) { for (name = (char *)cupsArrayFirst(best->names); name; name = (char *)cupsArrayNext(best->names)) { if (!_cups_strncasecmp(name, "@AUTHKEY(", 9) && check_authref(con, name + 9)) return (HTTP_OK); } for (name = (char *)cupsArrayFirst(best->names); name; name = (char *)cupsArrayNext(best->names)) { if (!_cups_strcasecmp(name, "@SYSTEM") && SystemGroupAuthKey && check_authref(con, SystemGroupAuthKey)) return (HTTP_OK); } return (HTTP_FORBIDDEN); } #endif /* HAVE_AUTHORIZATION_H */ for (name = (char *)cupsArrayFirst(best->names); name; name = (char *)cupsArrayNext(best->names)) { if (!_cups_strcasecmp(name, "@OWNER") && owner && !_cups_strcasecmp(username, ownername)) return (HTTP_OK); else if (!_cups_strcasecmp(name, "@SYSTEM")) { /* Do @SYSTEM later, when every other entry fails */ continue; } else if (name[0] == '@') { if (cupsdCheckGroup(username, pw, name + 1)) return (HTTP_OK); } else if (!_cups_strcasecmp(username, name)) return (HTTP_OK); } for (name = (char *)cupsArrayFirst(best->names); name; name = (char *)cupsArrayNext(best->names)) { if (!_cups_strcasecmp(name, "@SYSTEM")) { for (i = 0; i < NumSystemGroups; i ++) if (cupsdCheckGroup(username, pw, SystemGroups[i]) && check_admin_access(con)) return (HTTP_OK); } } return (con->username[0] ? HTTP_FORBIDDEN : HTTP_UNAUTHORIZED); } /* * Check to see if this user is in any of the named groups... */ cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdIsAuthorized: Checking group membership..."); /* * Check to see if this user is in any of the named groups... */ for (name = (char *)cupsArrayFirst(best->names); name; name = (char *)cupsArrayNext(best->names)) { if (!_cups_strcasecmp(name, "@SYSTEM")) { /* Do @SYSTEM later, when every other entry fails */ continue; } cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdIsAuthorized: Checking group \"%s\" membership...", name); if (cupsdCheckGroup(username, pw, name)) return (HTTP_OK); } for (name = (char *)cupsArrayFirst(best->names); name; name = (char *)cupsArrayNext(best->names)) { if (!_cups_strcasecmp(name, "@SYSTEM")) { cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdIsAuthorized: Checking group \"%s\" membership...", name); for (i = 0; i < NumSystemGroups; i ++) if (cupsdCheckGroup(username, pw, SystemGroups[i]) && check_admin_access(con)) return (HTTP_OK); } } /* * The user isn't part of the specified group, so deny access... */ cupsdLogMessage(CUPSD_LOG_DEBUG, "cupsdIsAuthorized: User not in group(s)."); return (con->username[0] ? HTTP_FORBIDDEN : HTTP_UNAUTHORIZED); } /* * 'cupsdNewLocation()' - Create a new location for authorization. * * Note: Still need to call cupsdAddLocation() to add it to the list of global * locations. */ cupsd_location_t * /* O - Pointer to new location record */ cupsdNewLocation(const char *location) /* I - Location path */ { cupsd_location_t *temp; /* New location */ /* * Try to allocate memory for the new location. */ if ((temp = calloc(1, sizeof(cupsd_location_t))) == NULL) return (NULL); /* * Initialize the record and copy the name over... */ if ((temp->location = _cupsStrAlloc(location)) == NULL) { free(temp); return (NULL); } temp->length = strlen(temp->location); /* * Return the new record... */ return (temp); } /* * 'check_admin_access()' - Verify that the client has administrative access. */ static int // O - 1 if authorized, 0 otherwise check_admin_access(cupsd_client_t *con) // I - Client connection { #if defined(HAVE_LIBAPPARMOR) && defined(HAVE_LIBSNAPDGLIB) /* * If the client accesses locally via domain socket, find out whether it * is a Snap. Grant access if it is not a Snap, if it is a classic Snap * or if it is a confined Snap which plugs "cups-control". Otherwise deny * access. */ int fd = httpGetFd(con->http); // Client socket file descriptor char *context = NULL; // AppArmor profile name of client SnapdClient *client = NULL; // Data structure of snapd access GError *error = NULL; // Glib error int ret = 1; // Return value # if !CUPS_SNAP SnapdSnap *snap = NULL; // Data structure of client Snap # endif // !CUPS_SNAP # ifdef AF_LOCAL // Only check domain sockets... if (httpAddrFamily(con->http->hostaddr) != AF_LOCAL) return (1); # endif // AF_LOCAL # if !CUPS_SNAP // If AppArmor is not enabled, then we can't identify the client... if (!aa_is_enabled()) { cupsdLogClient(con, CUPSD_LOG_DEBUG, "AppArmor not in use."); return (1); } # endif /* !CUPS_SNAP */ // Get the client's AppArmor context using the socket... if (aa_getpeercon(fd, &context, NULL) < 0) { cupsdLogClient(con, CUPSD_LOG_DEBUG, "AppArmor profile could not be retrieved: %s", strerror(errno)); return (1); } else { cupsdLogClient(con, CUPSD_LOG_DEBUG, "AppArmor profile is '%s'.", context); } // Allow access from "cups" snap... if (!strncmp(context, "snap.cups.", 10)) { cupsdLogClient(con, CUPSD_LOG_DEBUG, "Client from the CUPS Snap itself - allowed."); goto done; } # if CUPS_SNAP && defined(HAVE_SNAPD_CLIENT_RUN_SNAPCTL2_SYNC) /* * CUPS is snapped, so check whether the client is also snapped. If so, * determine whether the client snap has a "cups-control" plug which allows * the application to perform CUPS administrative tasks. */ const char *cookie; // snapd access cookie int status = 65535; // Status of client Snap context check const char *args[] = // snapctl arguments { "is-connected", "--apparmor-label", NULL, "cups-control", NULL }; // Connect to snapd if ((client = snapd_client_new()) == NULL) { cupsdLogClient(con, CUPSD_LOG_ERROR, "Unable to connect to snapd."); ret = 0; goto done; } // snapctl commands are sent over a domain socket snapd_client_set_socket_path(client, "/run/snapd-snap.socket"); // Take cookie from the environment if available if ((cookie = g_getenv("SNAP_COOKIE")) == NULL) { cookie = ""; cupsdLogClient(con, CUPSD_LOG_WARN, "No SNAP_COOKIE set in the Snap environment."); } // Do the client Snap context check... args[2] = context; if (!snapd_client_run_snapctl2_sync(client, cookie, (char **)args, NULL, NULL, &status, NULL, &error)) { cupsdLogClient(con, CUPSD_LOG_ERROR, "Unable to check snap context: %s", error->message); ret = 0; goto done; } switch (status) { case 0 : // The client is a confined Snap and plugs cups-control cupsdLogClient(con, CUPSD_LOG_DEBUG, "Snap with cups-control plug - allowed."); break; case 1 : // The client is a confined Snap and does not plug cups-control cupsdLogClient(con, CUPSD_LOG_DEBUG, "Snap without cups-control plug - denied."); ret = 0; break; case 10 : // The client is a classic Snap cupsdLogClient(con, CUPSD_LOG_DEBUG, "Classic snap - allowed."); break; case 11 : // The client is not a Snap cupsdLogClient(con, CUPSD_LOG_DEBUG, "Not a snap - allowed."); break; default : // Unexpected status... cupsdLogClient(con, CUPSD_LOG_ERROR, "Snap check returned unexpected status %d - denied.", status); ret = 0; break; } # elif !CUPS_SNAP /* * If CUPS is not snapped, check whether the client is snapped and if it has * the "cups-control" plug. */ // Is the client a snapped application? if (strncmp(context, "snap.", 5)) { cupsdLogClient(con, CUPSD_LOG_DEBUG, "Not a snap - allowed."); goto done; } // Extract the snap name from the context (snap.name.instance) char *snap_name = strdup(context + 5);// Snap name follows "snap." char *ptr = strchr(snap_name, '.'); // instance follows the name... if (!ptr) { cupsdLogClient(con, CUPSD_LOG_DEBUG, "Malformed snapd AppArmor profile name '%s' - denied.", context); free(snap_name); ret = 0; goto done; } *ptr = '\0'; cupsdLogClient(con, CUPSD_LOG_DEBUG, "Client snap is '%s'.", snap_name); // Connect to snapd if ((client = snapd_client_new()) == NULL) { cupsdLogClient(con, CUPSD_LOG_ERROR, "Unable to connect to snapd."); free(snap_name); ret = 0; goto done; } // Check whether the client Snap is under classic confinement GPtrArray *plugs = NULL; // List of plugs for snap if ((snap = snapd_client_get_snap_sync(client, snap_name, NULL, &error)) == NULL) { cupsdLogClient(con, CUPSD_LOG_DEBUG, "Unable to get client Snap data: %s", error->message); ret = 0; } // Snaps using classic confinement are granted access else if (snapd_snap_get_confinement(snap) == SNAPD_CONFINEMENT_CLASSIC) { cupsdLogClient(con, CUPSD_LOG_DEBUG, "Classic snap - allowed."); } // Check whether the client Snap has the cups-control plug else if (!snapd_client_get_connections2_sync(client, SNAPD_GET_CONNECTIONS_FLAGS_NONE, snap_name, "cups-control", NULL, NULL, &plugs, NULL, NULL, &error)) { cupsdLogClient(con, CUPSD_LOG_DEBUG, "Unable to get client Snap plugs: %s", error->message); ret = 0; } else if (!plugs || plugs->len <= 0) { cupsdLogClient(con, CUPSD_LOG_DEBUG, "Snap without cups-control plug - denied."); ret = 0; } else { cupsdLogClient(con, CUPSD_LOG_DEBUG, "Snap with cups-control plug - allowed."); } if (plugs) g_ptr_array_unref(plugs); free(snap_name); g_clear_object(&snap); # endif // CUPS_SNAP done: free(context); g_clear_object(&client); return (ret); #else // No AppArmor/snapd to deal with... return (1); #endif // HAVE_LIBAPPARMOR && HAVE_LIBSNAPDGLIB } #ifdef HAVE_AUTHORIZATION_H /* * 'check_authref()' - Check if an authorization services reference has the * supplied right. */ static int /* O - 1 if right is valid, 0 otherwise */ check_authref(cupsd_client_t *con, /* I - Connection */ const char *right) /* I - Right name */ { OSStatus status; /* OS Status */ AuthorizationItem authright; /* Authorization right */ AuthorizationRights authrights; /* Authorization rights */ AuthorizationFlags authflags; /* Authorization flags */ /* * Check to see if the user is allowed to perform the task... */ if (!con->authref) return (0); authright.name = right; authright.valueLength = 0; authright.value = NULL; authright.flags = 0; authrights.count = 1; authrights.items = &authright; authflags = kAuthorizationFlagDefaults | kAuthorizationFlagExtendRights; if ((status = AuthorizationCopyRights(con->authref, &authrights, kAuthorizationEmptyEnvironment, authflags, NULL)) != 0) { cupsdLogMessage(CUPSD_LOG_ERROR, "AuthorizationCopyRights(\"%s\") returned %d", authright.name, (int)status); return (0); } cupsdLogMessage(CUPSD_LOG_DEBUG2, "AuthorizationCopyRights(\"%s\") succeeded.", authright.name); return (1); } #endif /* HAVE_AUTHORIZATION_H */ /* * 'compare_locations()' - Compare two locations. */ static int /* O - Result of comparison */ compare_locations(cupsd_location_t *a, /* I - First location */ cupsd_location_t *b) /* I - Second location */ { return (strcmp(b->location, a->location)); } /* * 'copy_authmask()' - Copy function for auth masks. */ static cupsd_authmask_t * /* O - New auth mask */ copy_authmask(cupsd_authmask_t *mask, /* I - Existing auth mask */ void *data) /* I - User data (unused) */ { cupsd_authmask_t *temp; /* New auth mask */ (void)data; if ((temp = malloc(sizeof(cupsd_authmask_t))) != NULL) { memcpy(temp, mask, sizeof(cupsd_authmask_t)); if (temp->type == CUPSD_AUTH_NAME || temp->type == CUPSD_AUTH_INTERFACE) { /* * Make a copy of the name... */ if ((temp->mask.name.name = _cupsStrAlloc(temp->mask.name.name)) == NULL) { /* * Failed to make copy... */ free(temp); temp = NULL; } } } return (temp); } /* * 'free_authmask()' - Free function for auth masks. */ static void free_authmask(cupsd_authmask_t *mask, /* I - Auth mask to free */ void *data) /* I - User data (unused) */ { (void)data; if (mask->type == CUPSD_AUTH_NAME || mask->type == CUPSD_AUTH_INTERFACE) _cupsStrFree(mask->mask.name.name); free(mask); } #if HAVE_LIBPAM /* * 'pam_func()' - PAM conversation function. */ static int /* O - Success or failure */ pam_func( int num_msg, /* I - Number of messages */ const struct pam_message **msg, /* I - Messages */ struct pam_response **resp, /* O - Responses */ void *appdata_ptr) /* I - Pointer to connection */ { int i; /* Looping var */ struct pam_response *replies; /* Replies */ cupsd_authdata_t *data; /* Pointer to auth data */ /* * Allocate memory for the responses... */ if ((replies = malloc(sizeof(struct pam_response) * (size_t)num_msg)) == NULL) return (PAM_CONV_ERR); /* * Answer all of the messages... */ data = (cupsd_authdata_t *)appdata_ptr; for (i = 0; i < num_msg; i ++) { switch (msg[i]->msg_style) { case PAM_PROMPT_ECHO_ON: replies[i].resp_retcode = PAM_SUCCESS; replies[i].resp = strdup(data->username); break; case PAM_PROMPT_ECHO_OFF: replies[i].resp_retcode = PAM_SUCCESS; replies[i].resp = strdup(data->password); break; case PAM_TEXT_INFO: replies[i].resp_retcode = PAM_SUCCESS; replies[i].resp = NULL; break; case PAM_ERROR_MSG: replies[i].resp_retcode = PAM_SUCCESS; replies[i].resp = NULL; break; default: free(replies); return (PAM_CONV_ERR); } } /* * Return the responses back to PAM... */ *resp = replies; return (PAM_SUCCESS); } #endif /* HAVE_LIBPAM */