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pam/modules/pam_access/pam_access.c

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/* pam_access module */
/*
* Written by Alexei Nogin <alexei@nogin.dnttm.ru> 1997/06/15
* (I took login_access from logdaemon-5.6 and converted it to PAM
* using parts of pam_time code.)
*
************************************************************************
* Copyright message from logdaemon-5.6 (original file name DISCLAIMER)
************************************************************************
* Copyright 1995 by Wietse Venema. All rights reserved. Individual files
* may be covered by other copyrights (as noted in the file itself.)
*
* This material was originally written and compiled by Wietse Venema at
* Eindhoven University of Technology, The Netherlands, in 1990, 1991,
* 1992, 1993, 1994 and 1995.
*
* Redistribution and use in source and binary forms are permitted
* provided that this entire copyright notice is duplicated in all such
* copies.
*
* This software is provided "as is" and without any expressed or implied
* warranties, including, without limitation, the implied warranties of
* merchantibility and fitness for any particular purpose.
*************************************************************************
*/
#include "config.h"
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <stdarg.h>
#include <syslog.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <pwd.h>
#include <grp.h>
#include <errno.h>
#include <ctype.h>
#include <sys/utsname.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <sys/socket.h>
#include <glob.h>
#ifdef HAVE_LIBAUDIT
#include <libaudit.h>
#endif
/*
* here, we make definitions for the externally accessible functions
* in this file (these definitions are required for static modules
* but strongly encouraged generally) they are used to instruct the
* modules include file to define their prototypes.
*/
#define PAM_SM_AUTH
#define PAM_SM_ACCOUNT
#define PAM_SM_SESSION
#define PAM_SM_PASSWORD
#include <security/_pam_macros.h>
#include <security/pam_modules.h>
#include <security/pam_modutil.h>
#include <security/pam_ext.h>
/* login_access.c from logdaemon-5.6 with several changes by A.Nogin: */
/*
* This module implements a simple but effective form of login access
* control based on login names and on host (or domain) names, internet
* addresses (or network numbers), or on terminal line names in case of
* non-networked logins. Diagnostics are reported through syslog(3).
*
* Author: Wietse Venema, Eindhoven University of Technology, The Netherlands.
*/
#if !defined(MAXHOSTNAMELEN) || (MAXHOSTNAMELEN < 64)
#undef MAXHOSTNAMELEN
#define MAXHOSTNAMELEN 256
#endif
/* Delimiters for fields and for lists of users, ttys or hosts. */
#define ALL 2
#define YES 1
#define NO 0
#define NOMATCH -1
/*
* A structure to bundle up all login-related information to keep the
* functional interfaces as generic as possible.
*/
struct login_info {
const struct passwd *user;
const char *from;
const char *config_file;
const char *hostname;
int debug; /* Print debugging messages. */
int only_new_group_syntax; /* Only allow group entries of the form "(xyz)" */
int noaudit; /* Do not audit denials */
const char *fs; /* field separator */
const char *sep; /* list-element separator */
int from_remote_host; /* If PAM_RHOST was used for from */
struct addrinfo *res; /* Cached DNS resolution of from */
int gai_rv; /* Cached retval of getaddrinfo */
};
/* Parse module config arguments */
static int
parse_args(pam_handle_t *pamh, struct login_info *loginfo,
int argc, const char **argv)
{
int i;
loginfo->noaudit = NO;
loginfo->debug = NO;
loginfo->only_new_group_syntax = NO;
loginfo->fs = ":";
loginfo->sep = ", \t";
for (i=0; i<argc; ++i) {
if (!strncmp("fieldsep=", argv[i], 9)) {
/* the admin wants to override the default field separators */
loginfo->fs = argv[i]+9;
} else if (!strncmp("listsep=", argv[i], 8)) {
/* the admin wants to override the default list separators */
loginfo->sep = argv[i]+8;
} else if (!strncmp("accessfile=", argv[i], 11)) {
FILE *fp = fopen(11 + argv[i], "r");
if (fp) {
loginfo->config_file = 11 + argv[i];
fclose(fp);
} else {
pam_syslog(pamh, LOG_ERR,
"failed to open accessfile=[%s]: %m", 11 + argv[i]);
return 0;
}
} else if (strcmp (argv[i], "debug") == 0) {
loginfo->debug = YES;
} else if (strcmp (argv[i], "nodefgroup") == 0) {
loginfo->only_new_group_syntax = YES;
} else if (strcmp (argv[i], "noaudit") == 0) {
loginfo->noaudit = YES;
} else {
pam_syslog(pamh, LOG_ERR, "unrecognized option [%s]", argv[i]);
}
}
return 1; /* OK */
}
/* --- static functions for checking whether the user should be let in --- */
typedef int match_func (pam_handle_t *, char *, struct login_info *);
static int list_match (pam_handle_t *, char *, char *, struct login_info *,
match_func *);
static int user_match (pam_handle_t *, char *, struct login_info *);
static int group_match (pam_handle_t *, const char *, const char *, int);
static int from_match (pam_handle_t *, char *, struct login_info *);
static int string_match (pam_handle_t *, const char *, const char *, int);
static int network_netmask_match (pam_handle_t *, const char *, const char *, struct login_info *);
/* isipaddr - find out if string provided is an IP address or not */
static int
isipaddr (const char *string, int *addr_type,
struct sockaddr_storage *addr)
{
struct sockaddr_storage local_addr;
int is_ip;
/* We use struct sockaddr_storage addr because
* struct in_addr/in6_addr is an integral part
* of struct sockaddr and we doesn't want to
* use its value.
*/
if (addr == NULL)
addr = &local_addr;
memset(addr, 0, sizeof(struct sockaddr_storage));
/* first ipv4 */
if (inet_pton(AF_INET, string, addr) > 0)
{
if (addr_type != NULL)
*addr_type = AF_INET;
is_ip = YES;
}
else if (inet_pton(AF_INET6, string, addr) > 0)
{ /* then ipv6 */
if (addr_type != NULL) {
*addr_type = AF_INET6;
}
is_ip = YES;
}
else
is_ip = NO;
return is_ip;
}
/* are_addresses_equal - translate IP address strings to real IP
* addresses and compare them to find out if they are equal.
* If netmask was provided it will be used to focus comparation to
* relevant bits.
*/
static int
are_addresses_equal (const char *ipaddr0, const char *ipaddr1,
const char *netmask)
{
struct sockaddr_storage addr0;
struct sockaddr_storage addr1;
int addr_type0 = 0;
int addr_type1 = 0;
if (isipaddr (ipaddr0, &addr_type0, &addr0) == NO)
return NO;
if (isipaddr (ipaddr1, &addr_type1, &addr1) == NO)
return NO;
if (addr_type0 != addr_type1)
/* different address types */
return NO;
if (netmask != NULL) {
/* Got a netmask, so normalize addresses? */
struct sockaddr_storage nmask;
unsigned char *byte_a, *byte_nm;
memset(&nmask, 0, sizeof(struct sockaddr_storage));
if (inet_pton(addr_type0, netmask, (void *)&nmask) > 0) {
unsigned int i;
byte_a = (unsigned char *)(&addr0);
byte_nm = (unsigned char *)(&nmask);
for (i=0; i<sizeof(struct sockaddr_storage); i++) {
byte_a[i] = byte_a[i] & byte_nm[i];
}
byte_a = (unsigned char *)(&addr1);
byte_nm = (unsigned char *)(&nmask);
for (i=0; i<sizeof(struct sockaddr_storage); i++) {
byte_a[i] = byte_a[i] & byte_nm[i];
}
}
}
/* Are the two addresses equal? */
if (memcmp((void *)&addr0, (void *)&addr1,
sizeof(struct sockaddr_storage)) == 0) {
return(YES);
}
return(NO);
}
static char *
number_to_netmask (long netmask, int addr_type,
char *ipaddr_buf, size_t ipaddr_buf_len)
{
/* We use struct sockaddr_storage addr because
* struct in_addr/in6_addr is an integral part
* of struct sockaddr and we doesn't want to
* use its value.
*/
struct sockaddr_storage nmask;
unsigned char *byte_nm;
const char *ipaddr_dst = NULL;
int i, ip_bytes;
if (netmask == 0) {
/* mask 0 is the same like no mask */
return(NULL);
}
memset(&nmask, 0, sizeof(struct sockaddr_storage));
if (addr_type == AF_INET6) {
/* ipv6 address mask */
ip_bytes = 16;
} else {
/* default might be an ipv4 address mask */
addr_type = AF_INET;
ip_bytes = 4;
}
byte_nm = (unsigned char *)(&nmask);
/* translate number to mask */
for (i=0; i<ip_bytes; i++) {
if (netmask >= 8) {
byte_nm[i] = 0xff;
netmask -= 8;
} else
if (netmask > 0) {
byte_nm[i] = 0xff << (8 - netmask);
break;
} else
if (netmask <= 0) {
break;
}
}
/* now generate netmask address string */
ipaddr_dst = inet_ntop(addr_type, &nmask, ipaddr_buf, ipaddr_buf_len);
if (ipaddr_dst == ipaddr_buf) {
return (ipaddr_buf);
}
return (NULL);
}
/* login_access - match username/group and host/tty with access control file */
static int
login_access (pam_handle_t *pamh, struct login_info *item)
{
FILE *fp;
char line[BUFSIZ];
char *perm; /* becomes permission field */
char *users; /* becomes list of login names */
char *froms; /* becomes list of terminals or hosts */
int match = NO;
int nonall_match = NO;
int end;
int lineno = 0; /* for diagnostics */
char *sptr;
if (item->debug)
pam_syslog (pamh, LOG_DEBUG,
"login_access: user=%s, from=%s, file=%s",
item->user->pw_name,
item->from, item->config_file);
/*
* Process the table one line at a time and stop at the first match.
* Blank lines and lines that begin with a '#' character are ignored.
* Non-comment lines are broken at the ':' character. All fields are
* mandatory. The first field should be a "+" or "-" character. A
* non-existing table means no access control.
*/
if ((fp = fopen(item->config_file, "r"))!=NULL) {
while (!match && fgets(line, sizeof(line), fp)) {
lineno++;
if (line[end = strlen(line) - 1] != '\n') {
pam_syslog(pamh, LOG_ERR,
"%s: line %d: missing newline or line too long",
item->config_file, lineno);
continue;
}
if (line[0] == '#')
continue; /* comment line */
while (end > 0 && isspace(line[end - 1]))
end--;
line[end] = 0; /* strip trailing whitespace */
if (line[0] == 0) /* skip blank lines */
continue;
/* Allow field seperator in last field of froms */
if (!(perm = strtok_r(line, item->fs, &sptr))
|| !(users = strtok_r(NULL, item->fs, &sptr))
|| !(froms = strtok_r(NULL, "\n", &sptr))) {
pam_syslog(pamh, LOG_ERR, "%s: line %d: bad field count",
item->config_file, lineno);
continue;
}
if (perm[0] != '+' && perm[0] != '-') {
pam_syslog(pamh, LOG_ERR, "%s: line %d: bad first field",
item->config_file, lineno);
continue;
}
if (item->debug)
pam_syslog (pamh, LOG_DEBUG,
"line %d: %s : %s : %s", lineno, perm, users, froms);
match = list_match(pamh, users, NULL, item, user_match);
if (item->debug)
pam_syslog (pamh, LOG_DEBUG, "user_match=%d, \"%s\"",
match, item->user->pw_name);
if (match) {
match = list_match(pamh, froms, NULL, item, from_match);
if (!match && perm[0] == '+') {
nonall_match = YES;
}
if (item->debug)
pam_syslog (pamh, LOG_DEBUG,
"from_match=%d, \"%s\"", match, item->from);
}
}
(void) fclose(fp);
} else if (errno == ENOENT) {
/* This is no error. */
pam_syslog(pamh, LOG_WARNING, "warning: cannot open %s: %m",
item->config_file);
} else {
pam_syslog(pamh, LOG_ERR, "cannot open %s: %m", item->config_file);
return NO;
}
#ifdef HAVE_LIBAUDIT
if (!item->noaudit && (match == YES || (match == ALL &&
nonall_match == YES)) && line[0] == '-') {
pam_modutil_audit_write(pamh, AUDIT_ANOM_LOGIN_LOCATION,
"pam_access", 0);
}
#endif
if (match == NO)
return NOMATCH;
if (line[0] == '+')
return YES;
return NO;
}
/* list_match - match an item against a list of tokens with exceptions */
static int
list_match(pam_handle_t *pamh, char *list, char *sptr,
struct login_info *item, match_func *match_fn)
{
char *tok;
int match = NO;
if (item->debug && list != NULL)
pam_syslog (pamh, LOG_DEBUG,
"list_match: list=%s, item=%s", list, item->user->pw_name);
/*
* Process tokens one at a time. We have exhausted all possible matches
* when we reach an "EXCEPT" token or the end of the list. If we do find
* a match, look for an "EXCEPT" list and recurse to determine whether
* the match is affected by any exceptions.
*/
for (tok = strtok_r(list, item->sep, &sptr); tok != 0;
tok = strtok_r(NULL, item->sep, &sptr)) {
if (strcasecmp(tok, "EXCEPT") == 0) /* EXCEPT: give up */
break;
if ((match = (*match_fn) (pamh, tok, item))) /* YES */
break;
}
/* Process exceptions to matches. */
if (match != NO) {
while ((tok = strtok_r(NULL, item->sep, &sptr)) && strcasecmp(tok, "EXCEPT"))
/* VOID */ ;
if (tok == 0)
return match;
if (list_match(pamh, NULL, sptr, item, match_fn) == NO)
return YES; /* drop special meaning of ALL */
}
return (NO);
}
/* netgroup_match - match group against machine or user */
static int
netgroup_match (pam_handle_t *pamh, const char *netgroup,
const char *machine, const char *user, int debug)
{
int retval;
char *mydomain = NULL;
char domainname_res[256];
if (getdomainname (domainname_res, sizeof (domainname_res)) == 0)
{
if (domainname_res[0] != '\0' && strcmp (domainname_res, "(none)") != 0)
{
mydomain = domainname_res;
}
}
#ifdef HAVE_INNETGR
retval = innetgr (netgroup, machine, user, mydomain);
#else
retval = 0;
pam_syslog (pamh, LOG_ERR, "pam_access does not have netgroup support");
#endif
if (debug == YES)
pam_syslog (pamh, LOG_DEBUG,
"netgroup_match: %d (netgroup=%s, machine=%s, user=%s, domain=%s)",
retval, netgroup ? netgroup : "NULL",
machine ? machine : "NULL",
user ? user : "NULL", mydomain ? mydomain : "NULL");
return retval;
}
/* user_match - match a username against one token */
static int
user_match (pam_handle_t *pamh, char *tok, struct login_info *item)
{
char *string = item->user->pw_name;
struct login_info fake_item;
char *at;
int rv;
if (item->debug)
pam_syslog (pamh, LOG_DEBUG,
"user_match: tok=%s, item=%s", tok, string);
/*
* If a token has the magic value "ALL" the match always succeeds.
* Otherwise, return YES if the token fully matches the username, if the
* token is a group that contains the username, or if the token is the
* name of the user's primary group.
*/
/* Try to split on a pattern (@*[^@]+)(@+.*) */
for (at = tok; *at == '@'; ++at);
if (tok[0] == '(' && tok[strlen(tok) - 1] == ')') {
return (group_match (pamh, tok, string, item->debug));
} else if ((at = strchr(at, '@')) != NULL) {
/* split user@host pattern */
if (item->hostname == NULL)
return NO;
memcpy (&fake_item, item, sizeof(fake_item));
fake_item.from = item->hostname;
fake_item.gai_rv = 0;
fake_item.res = NULL;
fake_item.from_remote_host = 1; /* hostname should be resolvable */
*at = 0;
if (!user_match (pamh, tok, item))
return NO;
rv = from_match (pamh, at + 1, &fake_item);
if (fake_item.gai_rv == 0 && fake_item.res)
freeaddrinfo(fake_item.res);
return rv;
} else if (tok[0] == '@') { /* netgroup */
const char *hostname = NULL;
if (tok[1] == '@') { /* add hostname to netgroup match */
if (item->hostname == NULL)
return NO;
++tok;
hostname = item->hostname;
}
return (netgroup_match (pamh, tok + 1, hostname, string, item->debug));
} else if ((rv=string_match (pamh, tok, string, item->debug)) != NO) /* ALL or exact match */
return rv;
else if (item->only_new_group_syntax == NO &&
pam_modutil_user_in_group_nam_nam (pamh,
item->user->pw_name, tok))
/* try group membership */
return YES;
return NO;
}
/* group_match - match a username against token named group */
static int
group_match (pam_handle_t *pamh, const char *tok, const char* usr,
int debug)
{
char grptok[BUFSIZ];
if (debug)
pam_syslog (pamh, LOG_DEBUG,
"group_match: grp=%s, user=%s", tok, usr);
if (strlen(tok) < 3)
return NO;
/* token is recieved under the format '(...)' */
memset(grptok, 0, BUFSIZ);
strncpy(grptok, tok + 1, strlen(tok) - 2);
if (pam_modutil_user_in_group_nam_nam(pamh, usr, grptok))
return YES;
return NO;
}
/* from_match - match a host or tty against a list of tokens */
static int
from_match (pam_handle_t *pamh UNUSED, char *tok, struct login_info *item)
{
const char *string = item->from;
int tok_len;
int str_len;
int rv;
if (item->debug)
pam_syslog (pamh, LOG_DEBUG,
"from_match: tok=%s, item=%s", tok, string);
/*
* If a token has the magic value "ALL" the match always succeeds. Return
* YES if the token fully matches the string. If the token is a domain
* name, return YES if it matches the last fields of the string. If the
* token has the magic value "LOCAL", return YES if the from field was
* not taken by PAM_RHOST. If the token is a network number, return YES
* if it matches the head of the string.
*/
if (string == NULL) {
return NO;
} else if (tok[0] == '@') { /* netgroup */
return (netgroup_match (pamh, tok + 1, string, (char *) 0, item->debug));
} else if ((rv = string_match(pamh, tok, string, item->debug)) != NO) {
/* ALL or exact match */
return rv;
} else if (tok[0] == '.') { /* domain: match last fields */
if ((str_len = strlen(string)) > (tok_len = strlen(tok))
&& strcasecmp(tok, string + str_len - tok_len) == 0)
return (YES);
} else if (item->from_remote_host == 0) { /* local: no PAM_RHOSTS */
if (strcasecmp(tok, "LOCAL") == 0)
return (YES);
} else if (tok[(tok_len = strlen(tok)) - 1] == '.') {
struct addrinfo hint;
memset (&hint, '\0', sizeof (hint));
hint.ai_flags = AI_CANONNAME;
hint.ai_family = AF_INET;
if (item->gai_rv != 0)
return NO;
else if (!item->res &&
(item->gai_rv = getaddrinfo (string, NULL, &hint, &item->res)) != 0)
return NO;
else
{
struct addrinfo *runp = item->res;
while (runp != NULL)
{
char buf[INET_ADDRSTRLEN+2];
if (runp->ai_family == AF_INET)
{
inet_ntop (runp->ai_family,
&((struct sockaddr_in *) runp->ai_addr)->sin_addr,
buf, sizeof (buf));
strcat (buf, ".");
if (strncmp(tok, buf, tok_len) == 0)
{
return YES;
}
}
runp = runp->ai_next;
}
}
} else {
/* Assume network/netmask with a IP of a host. */
if (network_netmask_match(pamh, tok, string, item))
return YES;
}
return NO;
}
/* string_match - match a string against one token */
static int
string_match (pam_handle_t *pamh, const char *tok, const char *string,
int debug)
{
if (debug)
pam_syslog (pamh, LOG_DEBUG,
"string_match: tok=%s, item=%s", tok, string);
/*
* If the token has the magic value "ALL" the match always succeeds.
* Otherwise, return YES if the token fully matches the string.
* "NONE" token matches NULL string.
*/
if (strcasecmp(tok, "ALL") == 0) { /* all: always matches */
return (ALL);
} else if (string != NULL) {
if (strcasecmp(tok, string) == 0) { /* try exact match */
return (YES);
}
} else if (strcasecmp(tok, "NONE") == 0) {
return (YES);
}
return (NO);
}
/* network_netmask_match - match a string against one token
* where string is a hostname or ip (v4,v6) address and tok
* represents either a single ip (v4,v6) address or a network/netmask
*/
static int
network_netmask_match (pam_handle_t *pamh,
const char *tok, const char *string, struct login_info *item)
{
char *netmask_ptr;
char netmask_string[MAXHOSTNAMELEN + 1];
int addr_type;
if (item->debug)
pam_syslog (pamh, LOG_DEBUG,
"network_netmask_match: tok=%s, item=%s", tok, string);
/* OK, check if tok is of type addr/mask */
if ((netmask_ptr = strchr(tok, '/')) != NULL)
{
long netmask = 0;
/* YES */
*netmask_ptr = 0;
netmask_ptr++;
if (isipaddr(tok, &addr_type, NULL) == NO)
{ /* no netaddr */
return NO;
}
/* check netmask */
if (isipaddr(netmask_ptr, NULL, NULL) == NO)
{ /* netmask as integre value */
char *endptr = NULL;
netmask = strtol(netmask_ptr, &endptr, 0);
if ((endptr == netmask_ptr) || (*endptr != '\0'))
{ /* invalid netmask value */
return NO;
}
if ((netmask < 0) || (netmask >= 128))
{ /* netmask value out of range */
return NO;
}
netmask_ptr = number_to_netmask(netmask, addr_type,
netmask_string, MAXHOSTNAMELEN);
}
}
else
/* NO, then check if it is only an addr */
if (isipaddr(tok, NULL, NULL) != YES)
{
return NO;
}
if (isipaddr(string, NULL, NULL) != YES)
{
/* Assume network/netmask with a name of a host. */
struct addrinfo hint;
memset (&hint, '\0', sizeof (hint));
hint.ai_flags = AI_CANONNAME;
hint.ai_family = AF_UNSPEC;
if (item->gai_rv != 0)
return NO;
else if (!item->res &&
(item->gai_rv = getaddrinfo (string, NULL, &hint, &item->res)) != 0)
return NO;
else
{
struct addrinfo *runp = item->res;
while (runp != NULL)
{
char buf[INET6_ADDRSTRLEN];
inet_ntop (runp->ai_family,
runp->ai_family == AF_INET
? (void *) &((struct sockaddr_in *) runp->ai_addr)->sin_addr
: (void *) &((struct sockaddr_in6 *) runp->ai_addr)->sin6_addr,
buf, sizeof (buf));
if (are_addresses_equal(buf, tok, netmask_ptr))
{
return YES;
}
runp = runp->ai_next;
}
}
}
else
return (are_addresses_equal(string, tok, netmask_ptr));
return NO;
}
/* --- public PAM management functions --- */
int
pam_sm_authenticate (pam_handle_t *pamh, int flags UNUSED,
int argc, const char **argv)
{
struct login_info loginfo;
const char *user=NULL;
const void *void_from=NULL;
const char *from;
const char const *default_config = PAM_ACCESS_CONFIG;
struct passwd *user_pw;
char hostname[MAXHOSTNAMELEN + 1];
int rv;
/* set username */
if (pam_get_user(pamh, &user, NULL) != PAM_SUCCESS || user == NULL
|| *user == '\0') {
pam_syslog(pamh, LOG_ERR, "cannot determine the user's name");
return PAM_USER_UNKNOWN;
}
if ((user_pw=pam_modutil_getpwnam(pamh, user))==NULL)
return (PAM_USER_UNKNOWN);
/*
* Bundle up the arguments to avoid unnecessary clumsiness later on.
*/
memset(&loginfo, '\0', sizeof(loginfo));
loginfo.user = user_pw;
loginfo.config_file = default_config;
/* parse the argument list */
if (!parse_args(pamh, &loginfo, argc, argv)) {
pam_syslog(pamh, LOG_ERR, "failed to parse the module arguments");
return PAM_ABORT;
}
/* remote host name */
if (pam_get_item(pamh, PAM_RHOST, &void_from)
!= PAM_SUCCESS) {
pam_syslog(pamh, LOG_ERR, "cannot find the remote host name");
return PAM_ABORT;
}
from = void_from;
if ((from==NULL) || (*from=='\0')) {
/* local login, set tty name */
loginfo.from_remote_host = 0;
if (pam_get_item(pamh, PAM_TTY, &void_from) != PAM_SUCCESS
|| void_from == NULL) {
D(("PAM_TTY not set, probing stdin"));
from = ttyname(STDIN_FILENO);
if (from != NULL) {
if (pam_set_item(pamh, PAM_TTY, from) != PAM_SUCCESS)
pam_syslog(pamh, LOG_WARNING, "couldn't set tty name");
} else {
if (pam_get_item(pamh, PAM_SERVICE, &void_from) != PAM_SUCCESS
|| void_from == NULL) {
pam_syslog (pamh, LOG_ERR,
"cannot determine remote host, tty or service name");
return PAM_ABORT;
}
from = void_from;
if (loginfo.debug)
pam_syslog (pamh, LOG_DEBUG,
"cannot determine tty or remote hostname, using service %s",
from);
}
}
else
from = void_from;
if (from[0] == '/') { /* full path, remove device path. */
const char *f;
from++;
if ((f = strchr(from, '/')) != NULL) {
from = f + 1;
}
}
}
else
loginfo.from_remote_host = 1;
loginfo.from = from;
hostname[sizeof(hostname)-1] = '\0';
if (gethostname(hostname, sizeof(hostname)-1) == 0)
loginfo.hostname = hostname;
else {
pam_syslog (pamh, LOG_ERR, "gethostname failed: %m");
loginfo.hostname = NULL;
}
rv = login_access(pamh, &loginfo);
if (rv == NOMATCH && loginfo.config_file == default_config) {
glob_t globbuf;
int i, glob_rv;
/* We do not manipulate locale as setlocale() is not
* thread safe. We could use uselocale() in future.
*/
glob_rv = glob(ACCESS_CONF_GLOB, GLOB_ERR, NULL, &globbuf);
if (!glob_rv) {
/* Parse the *.conf files. */
for (i = 0; globbuf.gl_pathv[i] != NULL; i++) {
loginfo.config_file = globbuf.gl_pathv[i];
rv = login_access(pamh, &loginfo);
if (rv != NOMATCH)
break;
}
globfree(&globbuf);
}
}
if (loginfo.gai_rv == 0 && loginfo.res)
freeaddrinfo(loginfo.res);
if (rv) {
return (PAM_SUCCESS);
} else {
pam_syslog(pamh, LOG_ERR,
"access denied for user `%s' from `%s'",user,from);
return (PAM_PERM_DENIED);
}
}
int
pam_sm_setcred (pam_handle_t *pamh UNUSED, int flags UNUSED,
int argc UNUSED, const char **argv UNUSED)
{
return PAM_IGNORE;
}
int
pam_sm_acct_mgmt (pam_handle_t *pamh, int flags,
int argc, const char **argv)
{
return pam_sm_authenticate (pamh, flags, argc, argv);
}
int
pam_sm_open_session(pam_handle_t *pamh, int flags,
int argc, const char **argv)
{
return pam_sm_authenticate(pamh, flags, argc, argv);
}
int
pam_sm_close_session(pam_handle_t *pamh, int flags,
int argc, const char **argv)
{
return pam_sm_authenticate(pamh, flags, argc, argv);
}
int
pam_sm_chauthtok(pam_handle_t *pamh, int flags,
int argc, const char **argv)
{
return pam_sm_authenticate(pamh, flags, argc, argv);
}
/* end of module definition */
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