* See end for Copyright information
*/
-#if !(defined(linux))
-#error THIS CODE IS KNOWN TO WORK ONLY ON LINUX !!!
+#if !defined(linux) && !defined(__linux)
+#warning THIS CODE IS KNOWN TO WORK ONLY ON LINUX !!!
#endif
-#include <security/_pam_aconf.h>
+#include "config.h"
#include <stdio.h>
#include <unistd.h>
#include <errno.h>
#include <syslog.h>
#include <stdarg.h>
+#include <signal.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/resource.h>
-
+#include <limits.h>
+#include <glob.h>
#include <utmp.h>
#ifndef UT_USER /* some systems have ut_name instead of ut_user */
#define UT_USER ut_user
#include <grp.h>
#include <pwd.h>
+#include <locale.h>
+
+#ifdef HAVE_LIBAUDIT
+#include <libaudit.h>
+#endif
/* Module defines */
#define LINE_LENGTH 1024
#define LIMITS_DEF_USER 0 /* limit was set by an user entry */
#define LIMITS_DEF_GROUP 1 /* limit was set by a group entry */
-#define LIMITS_DEF_DEFAULT 2 /* limit was set by an default entry */
-#define LIMITS_DEF_NONE 3 /* this limit was not set yet */
-#define LIMITS_DEF_ALL 4 /* limit was set by an default entry */
-#define LIMITS_DEF_ALLGROUP 5 /* limit was set by a group entry */
+#define LIMITS_DEF_ALLGROUP 2 /* limit was set by a group entry */
+#define LIMITS_DEF_ALL 3 /* limit was set by an all entry */
+#define LIMITS_DEF_DEFAULT 4 /* limit was set by a default entry */
+#define LIMITS_DEF_KERNEL 5 /* limit was set from /proc/1/limits */
+#define LIMITS_DEF_NONE 6 /* this limit was not set yet */
+
+#define LIMIT_RANGE_ERR -1 /* error in specified uid/gid range */
+#define LIMIT_RANGE_NONE 0 /* no range specified */
+#define LIMIT_RANGE_ONE 1 /* exact uid/gid specified (:max_uid)*/
+#define LIMIT_RANGE_MIN 2 /* only minimum uid/gid specified (min_uid:) */
+#define LIMIT_RANGE_MM 3 /* both min and max uid/gid specified (min_uid:max_uid) */
static const char *limits_def_names[] = {
"USER",
"GROUP",
+ "ALLGROUP",
+ "ALL",
"DEFAULT",
+ "KERNEL",
"NONE",
- "ALL",
- "ALLGROUP",
- NULL,
+ NULL
};
struct user_limits_struct {
+ int supported;
int src_soft;
int src_hard;
struct rlimit limit;
int flag_numsyslogins; /* whether to limit logins only for a
specific user or to count all logins */
int priority; /* the priority to run user process with */
- int supported[RLIM_NLIMITS];
struct user_limits_struct limits[RLIM_NLIMITS];
- char conf_file[BUFSIZ];
+ const char *conf_file;
int utmp_after_pam_call;
+ char login_group[LINE_LENGTH];
};
#define LIMIT_LOGIN RLIM_NLIMITS+1
#include <security/pam_modules.h>
#include <security/_pam_macros.h>
-#include <security/_pam_modutil.h>
-
-/* logging */
-static void _pam_log(int err, const char *format, ...)
-{
- va_list args;
-
- va_start(args, format);
- openlog("pam_limits", LOG_CONS|LOG_PID, LOG_AUTH);
- vsyslog(err, format, args);
- va_end(args);
- closelog();
-}
+#include <security/pam_modutil.h>
+#include <security/pam_ext.h>
/* argument parsing */
#define PAM_DEBUG_ARG 0x0001
-#define PAM_DO_SETREUID 0x0002
#define PAM_UTMP_EARLY 0x0004
+#define PAM_NO_AUDIT 0x0008
+#define PAM_SET_ALL 0x0010
+
+/* Limits from globbed files. */
+#define LIMITS_CONF_GLOB LIMITS_FILE_DIR
+
+#define CONF_FILE (pl->conf_file != NULL)?pl->conf_file:LIMITS_FILE
-static int _pam_parse(int argc, const char **argv, struct pam_limit_s *pl)
+static int
+_pam_parse (const pam_handle_t *pamh, int argc, const char **argv,
+ struct pam_limit_s *pl)
{
int ctrl=0;
if (!strcmp(*argv,"debug")) {
ctrl |= PAM_DEBUG_ARG;
} else if (!strncmp(*argv,"conf=",5)) {
- strncpy(pl->conf_file,*argv+5,sizeof(pl->conf_file)-1);
- } else if (!strncmp(*argv,"change_uid",10)) {
- ctrl |= PAM_DO_SETREUID;
+ pl->conf_file = *argv+5;
} else if (!strcmp(*argv,"utmp_early")) {
ctrl |= PAM_UTMP_EARLY;
+ } else if (!strcmp(*argv,"noaudit")) {
+ ctrl |= PAM_NO_AUDIT;
+ } else if (!strcmp(*argv,"set_all")) {
+ ctrl |= PAM_SET_ALL;
} else {
- _pam_log(LOG_ERR,"pam_parse: unknown option; %s",*argv);
+ pam_syslog(pamh, LOG_ERR, "unknown option: %s", *argv);
}
}
- pl->conf_file[sizeof(pl->conf_file) - 1] = '\0';
return ctrl;
}
-
-/* limits stuff */
-#ifdef DEFAULT_CONF_FILE
-# define LIMITS_FILE DEFAULT_CONF_FILE
-#else
-# define LIMITS_FILE "/etc/security/limits.conf"
+static const char *
+rlimit2str (int i)
+{
+ switch (i) {
+ case RLIMIT_CPU:
+ return "cpu";
+ break;
+ case RLIMIT_FSIZE:
+ return "fsize";
+ break;
+ case RLIMIT_DATA:
+ return "data";
+ break;
+ case RLIMIT_STACK:
+ return "stack";
+ break;
+ case RLIMIT_CORE:
+ return "core";
+ break;
+ case RLIMIT_RSS:
+ return "rss";
+ break;
+ case RLIMIT_NPROC:
+ return "nproc";
+ break;
+ case RLIMIT_NOFILE:
+ return "nofile";
+ break;
+ case RLIMIT_MEMLOCK:
+ return "memlock";
+ break;
+#ifdef RLIMIT_AS
+ case RLIMIT_AS:
+ return "as";
+ break;
+#endif
+#ifdef RLIMIT_LOCKS
+ case RLIMIT_LOCKS:
+ return "locks";
+ break;
+#endif
+#ifdef RLIMIT_SIGPENDING
+ case RLIMIT_SIGPENDING:
+ return "sigpending";
+ break;
#endif
+#ifdef RLIMIT_MSGQUEUE
+ case RLIMIT_MSGQUEUE:
+ return "msgqueue";
+ break;
+#endif
+#ifdef RLIMIT_NICE
+ case RLIMIT_NICE:
+ return "nice";
+ break;
+#endif
+#ifdef RLIMIT_RTPRIO
+ case RLIMIT_RTPRIO:
+ return "rtprio";
+ break;
+#endif
+ default:
+ return "UNKNOWN";
+ break;
+ }
+}
+
#define LIMITED_OK 0 /* limit setting appeared to work */
#define LIMIT_ERR 1 /* error setting a limit */
struct pam_limit_s *pl)
{
struct utmp *ut;
- unsigned int count;
+ int count;
if (ctrl & PAM_DEBUG_ARG) {
- _pam_log(LOG_DEBUG, "checking logins for '%s' (maximum of %d)\n",
- name, limit);
+ pam_syslog(pamh, LOG_DEBUG,
+ "checking logins for '%s' (maximum of %d)", name, limit);
}
if (limit < 0)
return 0; /* no limits imposed */
if (limit == 0) /* maximum 0 logins ? */ {
- _pam_log(LOG_WARNING, "No logins allowed for '%s'\n", name);
+ pam_syslog(pamh, LOG_WARNING, "No logins allowed for '%s'", name);
return LOGIN_ERR;
}
continue;
}
if (!pl->flag_numsyslogins) {
+ char user[sizeof(ut->UT_USER) + 1];
+ user[0] = '\0';
+ strncat(user, ut->UT_USER, sizeof(ut->UT_USER));
+
if (((pl->login_limit_def == LIMITS_DEF_USER)
|| (pl->login_limit_def == LIMITS_DEF_GROUP)
|| (pl->login_limit_def == LIMITS_DEF_DEFAULT))
- && strncmp(name, ut->UT_USER, sizeof(ut->UT_USER)) != 0) {
+ && strcmp(name, user) != 0) {
continue;
}
if ((pl->login_limit_def == LIMITS_DEF_ALLGROUP)
- && !_pammodutil_user_in_group_nam_nam(pamh, ut->UT_USER, name)) {
+ && !pam_modutil_user_in_group_nam_nam(pamh, user, pl->login_group)) {
continue;
}
+ if (kill(ut->ut_pid, 0) == -1 && errno == ESRCH) {
+ /* process does not exist anymore */
+ pam_syslog(pamh, LOG_INFO,
+ "Stale utmp entry (pid %d) for '%s' ignored",
+ ut->ut_pid, user);
+ continue;
+ }
}
if (++count > limit) {
break;
endutent();
if (count > limit) {
if (name) {
- _pam_log(LOG_WARNING, "Too many logins (max %d) for %s",
- limit, name);
+ pam_syslog(pamh, LOG_NOTICE,
+ "Too many logins (max %d) for %s", limit, name);
} else {
- _pam_log(LOG_WARNING, "Too many system logins (max %d)", limit);
+ pam_syslog(pamh, LOG_NOTICE, "Too many system logins (max %d)", limit);
}
return LOGIN_ERR;
}
return 0;
}
-static int init_limits(struct pam_limit_s *pl)
+static const char *lnames[RLIM_NLIMITS] = {
+ [RLIMIT_CPU] = "Max cpu time",
+ [RLIMIT_FSIZE] = "Max file size",
+ [RLIMIT_DATA] = "Max data size",
+ [RLIMIT_STACK] = "Max stack size",
+ [RLIMIT_CORE] = "Max core file size",
+ [RLIMIT_RSS] = "Max resident set",
+ [RLIMIT_NPROC] = "Max processes",
+ [RLIMIT_NOFILE] = "Max open files",
+ [RLIMIT_MEMLOCK] = "Max locked memory",
+#ifdef RLIMIT_AS
+ [RLIMIT_AS] = "Max address space",
+#endif
+#ifdef RLIMIT_LOCKS
+ [RLIMIT_LOCKS] = "Max file locks",
+#endif
+#ifdef RLIMIT_SIGPENDING
+ [RLIMIT_SIGPENDING] = "Max pending signals",
+#endif
+#ifdef RLIMIT_MSGQUEUE
+ [RLIMIT_MSGQUEUE] = "Max msgqueue size",
+#endif
+#ifdef RLIMIT_NICE
+ [RLIMIT_NICE] = "Max nice priority",
+#endif
+#ifdef RLIMIT_RTPRIO
+ [RLIMIT_RTPRIO] = "Max realtime priority",
+#endif
+#ifdef RLIMIT_RTTIME
+ [RLIMIT_RTTIME] = "Max realtime timeout",
+#endif
+};
+
+static int str2rlimit(char *name) {
+ int i;
+ if (!name || *name == '\0')
+ return -1;
+ for(i = 0; i < RLIM_NLIMITS; i++) {
+ if (strcmp(name, lnames[i]) == 0) return i;
+ }
+ return -1;
+}
+
+static rlim_t str2rlim_t(char *value) {
+ unsigned long long rlimit = 0;
+
+ if (!value) return (rlim_t)rlimit;
+ if (strcmp(value, "unlimited") == 0) {
+ return RLIM_INFINITY;
+ }
+ rlimit = strtoull(value, NULL, 10);
+ return (rlim_t)rlimit;
+}
+
+#define LIMITS_SKIP_WHITESPACE { \
+ /* step backwards over spaces */ \
+ pos--; \
+ while (pos && line[pos] == ' ') pos--; \
+ if (!pos) continue; \
+ line[pos+1] = '\0'; \
+}
+#define LIMITS_MARK_ITEM(item) { \
+ /* step backwards over non-spaces */ \
+ pos--; \
+ while (pos && line[pos] != ' ') pos--; \
+ if (!pos) continue; \
+ item = line + pos + 1; \
+}
+
+static void parse_kernel_limits(pam_handle_t *pamh, struct pam_limit_s *pl, int ctrl)
+{
+ int i, maxlen = 0;
+ FILE *limitsfile;
+ const char *proclimits = "/proc/1/limits";
+ char line[256];
+ char *units, *hard, *soft, *name;
+
+ if (!(limitsfile = fopen(proclimits, "r"))) {
+ pam_syslog(pamh, LOG_WARNING, "Could not read %s (%s), using PAM defaults", proclimits, strerror(errno));
+ return;
+ }
+
+ while (fgets(line, 256, limitsfile)) {
+ int pos = strlen(line);
+ if (pos < 2) continue;
+
+ /* drop trailing newline */
+ if (line[pos-1] == '\n') {
+ pos--;
+ line[pos] = '\0';
+ }
+
+ /* determine formatting boundry of limits report */
+ if (!maxlen && strncmp(line, "Limit", 5) == 0) {
+ maxlen = pos;
+ continue;
+ }
+
+ if (pos == maxlen) {
+ /* step backwards over "Units" name */
+ LIMITS_SKIP_WHITESPACE;
+ LIMITS_MARK_ITEM(units);
+ }
+ else {
+ units = "";
+ }
+
+ /* step backwards over "Hard Limit" value */
+ LIMITS_SKIP_WHITESPACE;
+ LIMITS_MARK_ITEM(hard);
+
+ /* step backwards over "Soft Limit" value */
+ LIMITS_SKIP_WHITESPACE;
+ LIMITS_MARK_ITEM(soft);
+
+ /* step backwards over name of limit */
+ LIMITS_SKIP_WHITESPACE;
+ name = line;
+
+ i = str2rlimit(name);
+ if (i < 0 || i >= RLIM_NLIMITS) {
+ if (ctrl & PAM_DEBUG_ARG)
+ pam_syslog(pamh, LOG_DEBUG, "Unknown kernel rlimit '%s' ignored", name);
+ continue;
+ }
+ pl->limits[i].limit.rlim_cur = str2rlim_t(soft);
+ pl->limits[i].limit.rlim_max = str2rlim_t(hard);
+ pl->limits[i].src_soft = LIMITS_DEF_KERNEL;
+ pl->limits[i].src_hard = LIMITS_DEF_KERNEL;
+ }
+ fclose(limitsfile);
+}
+
+static int init_limits(pam_handle_t *pamh, struct pam_limit_s *pl, int ctrl)
{
int i;
int retval = PAM_SUCCESS;
for(i = 0; i < RLIM_NLIMITS; i++) {
int r = getrlimit(i, &pl->limits[i].limit);
if (r == -1) {
- if (errno == EINVAL) {
- pl->supported[i] = 0;
- } else {
+ pl->limits[i].supported = 0;
+ if (errno != EINVAL) {
retval = !PAM_SUCCESS;
}
} else {
- pl->supported[i] = 1;
+ pl->limits[i].supported = 1;
pl->limits[i].src_soft = LIMITS_DEF_NONE;
pl->limits[i].src_hard = LIMITS_DEF_NONE;
}
}
- pl->priority = 0;
+#ifdef __linux__
+ if (ctrl & PAM_SET_ALL) {
+ parse_kernel_limits(pamh, pl, ctrl);
+
+ for(i = 0; i < RLIM_NLIMITS; i++) {
+ if (pl->limits[i].supported &&
+ (pl->limits[i].src_soft == LIMITS_DEF_NONE ||
+ pl->limits[i].src_hard == LIMITS_DEF_NONE)) {
+ pam_syslog(pamh, LOG_WARNING, "Did not find kernel RLIMIT for %s, using PAM default", rlimit2str(i));
+ }
+ }
+ }
+#endif
+
+ errno = 0;
+ pl->priority = getpriority (PRIO_PROCESS, 0);
+ if (pl->priority == -1 && errno != 0)
+ retval = !PAM_SUCCESS;
pl->login_limit = -2;
pl->login_limit_def = LIMITS_DEF_NONE;
return retval;
}
-static void process_limit(int source, const char *lim_type,
- const char *lim_item, const char *lim_value,
- int ctrl, struct pam_limit_s *pl)
+static void
+process_limit (const pam_handle_t *pamh, int source, const char *lim_type,
+ const char *lim_item, const char *lim_value,
+ int ctrl, struct pam_limit_s *pl)
{
int limit_item;
int limit_type = 0;
- long limit_value;
+ int int_value = 0;
+ rlim_t rlimit_value = 0;
char *endptr;
const char *value_orig = lim_value;
if (ctrl & PAM_DEBUG_ARG)
- _pam_log(LOG_DEBUG, "%s: processing %s %s %s for %s\n",
- __FUNCTION__,lim_type,lim_item,lim_value,
- limits_def_names[source]);
+ pam_syslog(pamh, LOG_DEBUG, "%s: processing %s %s %s for %s",
+ __FUNCTION__, lim_type, lim_item, lim_value,
+ limits_def_names[source]);
if (strcmp(lim_item, "cpu") == 0)
limit_item = RLIMIT_CPU;
limit_item = RLIMIT_NOFILE;
else if (strcmp(lim_item, "memlock") == 0)
limit_item = RLIMIT_MEMLOCK;
+#ifdef RLIMIT_AS
else if (strcmp(lim_item, "as") == 0)
limit_item = RLIMIT_AS;
+#endif /*RLIMIT_AS*/
#ifdef RLIMIT_LOCKS
else if (strcmp(lim_item, "locks") == 0)
limit_item = RLIMIT_LOCKS;
+#endif
+#ifdef RLIMIT_SIGPENDING
+ else if (strcmp(lim_item, "sigpending") == 0)
+ limit_item = RLIMIT_SIGPENDING;
+#endif
+#ifdef RLIMIT_MSGQUEUE
+ else if (strcmp(lim_item, "msgqueue") == 0)
+ limit_item = RLIMIT_MSGQUEUE;
+#endif
+#ifdef RLIMIT_NICE
+ else if (strcmp(lim_item, "nice") == 0)
+ limit_item = RLIMIT_NICE;
+#endif
+#ifdef RLIMIT_RTPRIO
+ else if (strcmp(lim_item, "rtprio") == 0)
+ limit_item = RLIMIT_RTPRIO;
#endif
else if (strcmp(lim_item, "maxlogins") == 0) {
limit_item = LIMIT_LOGIN;
} else if (strcmp(lim_item, "priority") == 0) {
limit_item = LIMIT_PRI;
} else {
- _pam_log(LOG_DEBUG,"unknown limit item '%s'", lim_item);
+ pam_syslog(pamh, LOG_DEBUG, "unknown limit item '%s'", lim_item);
return;
}
else if (strcmp(lim_type,"-")==0)
limit_type=LIMIT_SOFT | LIMIT_HARD;
else if (limit_item != LIMIT_LOGIN && limit_item != LIMIT_NUMSYSLOGINS) {
- _pam_log(LOG_DEBUG,"unknown limit type '%s'", lim_type);
+ pam_syslog(pamh, LOG_DEBUG, "unknown limit type '%s'", lim_type);
return;
}
-
- limit_value = strtol (lim_value, &endptr, 10);
-
- /* special case value when limiting logins */
- if (limit_value == 0 && value_orig == endptr) { /* no chars read */
- if (strcmp(lim_value,"-") != 0) {
- _pam_log(LOG_DEBUG,"wrong limit value '%s'", lim_value);
+ if (limit_item != LIMIT_PRI
+#ifdef RLIMIT_NICE
+ && limit_item != RLIMIT_NICE
+#endif
+ && (strcmp(lim_value, "-1") == 0
+ || strcmp(lim_value, "-") == 0 || strcmp(lim_value, "unlimited") == 0
+ || strcmp(lim_value, "infinity") == 0)) {
+ int_value = -1;
+ rlimit_value = RLIM_INFINITY;
+ } else if (limit_item == LIMIT_PRI || limit_item == LIMIT_LOGIN ||
+#ifdef RLIMIT_NICE
+ limit_item == RLIMIT_NICE ||
+#endif
+ limit_item == LIMIT_NUMSYSLOGINS) {
+ long temp;
+ temp = strtol (lim_value, &endptr, 10);
+ temp = temp < INT_MAX ? temp : INT_MAX;
+ int_value = temp > INT_MIN ? temp : INT_MIN;
+ if (int_value == 0 && value_orig == endptr) {
+ pam_syslog(pamh, LOG_DEBUG,
+ "wrong limit value '%s' for limit type '%s'",
+ lim_value, lim_type);
return;
- } else
- if (limit_item != LIMIT_LOGIN) {
- if (ctrl & PAM_DEBUG_ARG)
- _pam_log(LOG_DEBUG,
- "'-' limit value valid for maxlogins type only");
- return;
- } else
- limit_value = -1;
- }
+ }
+ } else {
+#ifdef __USE_FILE_OFFSET64
+ rlimit_value = strtoull (lim_value, &endptr, 10);
+#else
+ rlimit_value = strtoul (lim_value, &endptr, 10);
+#endif
+ if (rlimit_value == 0 && value_orig == endptr) {
+ pam_syslog(pamh, LOG_DEBUG,
+ "wrong limit value '%s' for limit type '%s'",
+ lim_value, lim_type);
+ return;
+ }
+ }
/* one more special case when limiting logins */
if ((source == LIMITS_DEF_ALL || source == LIMITS_DEF_ALLGROUP)
&& (limit_item != LIMIT_LOGIN)) {
if (ctrl & PAM_DEBUG_ARG)
- _pam_log(LOG_DEBUG,
- "'%%' domain valid for maxlogins type only");
+ pam_syslog(pamh, LOG_DEBUG,
+ "'%%' domain valid for maxlogins type only");
return;
}
switch(limit_item) {
case RLIMIT_CPU:
- limit_value *= 60;
- break;
+ if (rlimit_value != RLIM_INFINITY)
+ {
+ if (rlimit_value >= RLIM_INFINITY/60)
+ rlimit_value = RLIM_INFINITY;
+ else
+ rlimit_value *= 60;
+ }
+ break;
case RLIMIT_FSIZE:
case RLIMIT_DATA:
case RLIMIT_STACK:
case RLIMIT_CORE:
case RLIMIT_RSS:
case RLIMIT_MEMLOCK:
+#ifdef RLIMIT_AS
case RLIMIT_AS:
- limit_value *= 1024;
- break;
+#endif
+ if (rlimit_value != RLIM_INFINITY)
+ {
+ if (rlimit_value >= RLIM_INFINITY/1024)
+ rlimit_value = RLIM_INFINITY;
+ else
+ rlimit_value *= 1024;
+ }
+ break;
+#ifdef RLIMIT_NICE
+ case RLIMIT_NICE:
+ if (int_value > 19)
+ int_value = 19;
+ if (int_value < -20)
+ int_value = -20;
+ rlimit_value = 20 - int_value;
+ break;
+#endif
}
if ( (limit_item != LIMIT_LOGIN)
if (pl->limits[limit_item].src_soft < source) {
return;
} else {
- pl->limits[limit_item].limit.rlim_cur = limit_value;
+ pl->limits[limit_item].limit.rlim_cur = rlimit_value;
pl->limits[limit_item].src_soft = source;
}
}
if (pl->limits[limit_item].src_hard < source) {
return;
} else {
- pl->limits[limit_item].limit.rlim_max = limit_value;
+ pl->limits[limit_item].limit.rlim_max = rlimit_value;
pl->limits[limit_item].src_hard = source;
}
}
/* recent kernels support negative priority limits (=raise priority) */
if (limit_item == LIMIT_PRI) {
- pl->priority = limit_value;
+ pl->priority = int_value;
} else {
if (pl->login_limit_def < source) {
return;
} else {
- pl->login_limit = limit_value;
+ pl->login_limit = int_value;
pl->login_limit_def = source;
- }
+ }
}
}
return;
}
-static int parse_config_file(pam_handle_t *pamh, const char *uname, int ctrl,
- struct pam_limit_s *pl)
+static int
+parse_uid_range(pam_handle_t *pamh, const char *domain,
+ uid_t *min_uid, uid_t *max_uid)
+{
+ const char *range = domain;
+ char *pmax;
+ char *endptr;
+ int rv = LIMIT_RANGE_MM;
+
+ if ((pmax=strchr(range, ':')) == NULL)
+ return LIMIT_RANGE_NONE;
+ ++pmax;
+
+ if (range[0] == '@' || range[0] == '%')
+ ++range;
+
+ if (range[0] == ':')
+ rv = LIMIT_RANGE_ONE;
+ else {
+ errno = 0;
+ *min_uid = strtoul (range, &endptr, 10);
+ if (errno != 0 || (range == endptr) || *endptr != ':') {
+ pam_syslog(pamh, LOG_DEBUG,
+ "wrong min_uid/gid value in '%s'", domain);
+ return LIMIT_RANGE_ERR;
+ }
+ }
+
+ if (*pmax == '\0') {
+ if (rv == LIMIT_RANGE_ONE)
+ return LIMIT_RANGE_ERR;
+ else
+ return LIMIT_RANGE_MIN;
+ }
+
+ errno = 0;
+ *max_uid = strtoul (pmax, &endptr, 10);
+ if (errno != 0 || (pmax == endptr) || *endptr != '\0') {
+ pam_syslog(pamh, LOG_DEBUG,
+ "wrong max_uid/gid value in '%s'", domain);
+ return LIMIT_RANGE_ERR;
+ }
+
+ if (rv == LIMIT_RANGE_ONE)
+ *min_uid = *max_uid;
+ return rv;
+}
+
+static int
+parse_config_file(pam_handle_t *pamh, const char *uname, uid_t uid, gid_t gid,
+ int ctrl, struct pam_limit_s *pl)
{
FILE *fil;
char buf[LINE_LENGTH];
-#define CONF_FILE (pl->conf_file[0])?pl->conf_file:LIMITS_FILE
/* check for the LIMITS_FILE */
if (ctrl & PAM_DEBUG_ARG)
- _pam_log(LOG_DEBUG,"reading settings from '%s'", CONF_FILE);
+ pam_syslog(pamh, LOG_DEBUG, "reading settings from '%s'", CONF_FILE);
fil = fopen(CONF_FILE, "r");
if (fil == NULL) {
- _pam_log (LOG_WARNING, "can not read settings from %s", CONF_FILE);
+ pam_syslog (pamh, LOG_WARNING,
+ "cannot read settings from %s: %m", CONF_FILE);
return PAM_SERVICE_ERR;
}
-#undef CONF_FILE
- /* init things */
- memset(buf, 0, sizeof(buf));
/* start the show */
while (fgets(buf, LINE_LENGTH, fil) != NULL) {
char domain[LINE_LENGTH];
char ltype[LINE_LENGTH];
char item[LINE_LENGTH];
char value[LINE_LENGTH];
- int i,j;
- char *tptr;
+ int i;
+ int rngtype;
+ size_t j;
+ char *tptr,*line;
+ uid_t min_uid = (uid_t)-1, max_uid = (uid_t)-1;
- tptr = buf;
+ line = buf;
/* skip the leading white space */
- while (*tptr && isspace(*tptr))
- tptr++;
- strncpy(buf, tptr, sizeof(buf)-1);
- buf[sizeof(buf)-1] = '\0';
+ while (*line && isspace(*line))
+ line++;
/* Rip off the comments */
- tptr = strchr(buf,'#');
+ tptr = strchr(line,'#');
if (tptr)
*tptr = '\0';
/* Rip off the newline char */
- tptr = strchr(buf,'\n');
+ tptr = strchr(line,'\n');
if (tptr)
*tptr = '\0';
/* Anything left ? */
- if (!strlen(buf)) {
- memset(buf, 0, sizeof(buf));
+ if (!strlen(line))
continue;
- }
- memset(domain, 0, sizeof(domain));
- memset(ltype, 0, sizeof(ltype));
- memset(item, 0, sizeof(item));
- memset(value, 0, sizeof(value));
+ domain[0] = ltype[0] = item[0] = value[0] = '\0';
- i = sscanf(buf,"%s%s%s%s", domain, ltype, item, value);
+ i = sscanf(line,"%s%s%s%s", domain, ltype, item, value);
D(("scanned line[%d]: domain[%s], ltype[%s], item[%s], value[%s]",
i, domain, ltype, item, value));
- for(j=0; j < strlen(domain); j++)
- domain[j]=tolower(domain[j]);
for(j=0; j < strlen(ltype); j++)
ltype[j]=tolower(ltype[j]);
- for(j=0; j < strlen(item); j++)
- item[j]=tolower(item[j]);
- for(j=0; j < strlen(value); j++)
- value[j]=tolower(value[j]);
+
+ if ((rngtype=parse_uid_range(pamh, domain, &min_uid, &max_uid)) < 0) {
+ pam_syslog(pamh, LOG_WARNING, "invalid uid range '%s' - skipped", domain);
+ continue;
+ }
if (i == 4) { /* a complete line */
+ for(j=0; j < strlen(item); j++)
+ item[j]=tolower(item[j]);
+ for(j=0; j < strlen(value); j++)
+ value[j]=tolower(value[j]);
+
if (strcmp(uname, domain) == 0) /* this user have a limit */
- process_limit(LIMITS_DEF_USER, ltype, item, value, ctrl, pl);
+ process_limit(pamh, LIMITS_DEF_USER, ltype, item, value, ctrl, pl);
else if (domain[0]=='@') {
- if (ctrl & PAM_DEBUG_ARG) {
- _pam_log(LOG_DEBUG, "checking if %s is in group %s",
- uname, domain + 1);
- }
- if (_pammodutil_user_in_group_nam_nam(pamh, uname, domain+1))
- process_limit(LIMITS_DEF_GROUP, ltype, item, value, ctrl,
+ if (ctrl & PAM_DEBUG_ARG) {
+ pam_syslog(pamh, LOG_DEBUG,
+ "checking if %s is in group %s",
+ uname, domain + 1);
+ }
+ switch(rngtype) {
+ case LIMIT_RANGE_NONE:
+ if (pam_modutil_user_in_group_nam_nam(pamh, uname, domain+1))
+ process_limit(pamh, LIMITS_DEF_GROUP, ltype, item, value, ctrl,
+ pl);
+ break;
+ case LIMIT_RANGE_ONE:
+ if (pam_modutil_user_in_group_nam_gid(pamh, uname, (gid_t)max_uid))
+ process_limit(pamh, LIMITS_DEF_GROUP, ltype, item, value, ctrl,
pl);
+ break;
+ case LIMIT_RANGE_MM:
+ if (gid > (gid_t)max_uid)
+ break;
+ /* fallthrough */
+ case LIMIT_RANGE_MIN:
+ if (gid >= (gid_t)min_uid)
+ process_limit(pamh, LIMITS_DEF_GROUP, ltype, item, value, ctrl,
+ pl);
+ }
} else if (domain[0]=='%') {
- if (ctrl & PAM_DEBUG_ARG) {
- _pam_log(LOG_DEBUG, "checking if %s is in group %s",
- uname, domain + 1);
- }
- if (strcmp(domain,"%") == 0)
- process_limit(LIMITS_DEF_ALL, ltype, item, value, ctrl,
- pl);
- else if (_pammodutil_user_in_group_nam_nam(pamh, uname, domain+1))
- process_limit(LIMITS_DEF_ALLGROUP, ltype, item, value, ctrl,
- pl);
- } else if (strcmp(domain, "*") == 0)
- process_limit(LIMITS_DEF_DEFAULT, ltype, item, value, ctrl,
- pl);
+ if (ctrl & PAM_DEBUG_ARG) {
+ pam_syslog(pamh, LOG_DEBUG,
+ "checking if %s is in group %s",
+ uname, domain + 1);
+ }
+ switch(rngtype) {
+ case LIMIT_RANGE_NONE:
+ if (strcmp(domain,"%") == 0)
+ process_limit(pamh, LIMITS_DEF_ALL, ltype, item, value, ctrl,
+ pl);
+ else if (pam_modutil_user_in_group_nam_nam(pamh, uname, domain+1)) {
+ strcpy(pl->login_group, domain+1);
+ process_limit(pamh, LIMITS_DEF_ALLGROUP, ltype, item, value, ctrl,
+ pl);
+ }
+ break;
+ case LIMIT_RANGE_ONE:
+ if (pam_modutil_user_in_group_nam_gid(pamh, uname, (gid_t)max_uid)) {
+ struct group *grp;
+ grp = pam_modutil_getgrgid(pamh, (gid_t)max_uid);
+ strncpy(pl->login_group, grp->gr_name, sizeof(pl->login_group));
+ pl->login_group[sizeof(pl->login_group)-1] = '\0';
+ process_limit(pamh, LIMITS_DEF_ALLGROUP, ltype, item, value, ctrl,
+ pl);
+ }
+ break;
+ case LIMIT_RANGE_MIN:
+ case LIMIT_RANGE_MM:
+ pam_syslog(pamh, LOG_WARNING, "range unsupported for %%group matching - ignored");
+ }
+ } else {
+ switch(rngtype) {
+ case LIMIT_RANGE_NONE:
+ if (strcmp(domain, "*") == 0)
+ process_limit(pamh, LIMITS_DEF_DEFAULT, ltype, item, value, ctrl,
+ pl);
+ break;
+ case LIMIT_RANGE_ONE:
+ if (uid != max_uid)
+ break;
+ /* fallthrough */
+ case LIMIT_RANGE_MM:
+ if (uid > max_uid)
+ break;
+ /* fallthrough */
+ case LIMIT_RANGE_MIN:
+ if (uid >= min_uid)
+ process_limit(pamh, LIMITS_DEF_USER, ltype, item, value, ctrl, pl);
+ }
+ }
} else if (i == 2 && ltype[0] == '-') { /* Probably a no-limit line */
if (strcmp(uname, domain) == 0) {
if (ctrl & PAM_DEBUG_ARG) {
- _pam_log(LOG_DEBUG, "no limits for '%s'", uname);
+ pam_syslog(pamh, LOG_DEBUG, "no limits for '%s'", uname);
+ }
+ } else if (domain[0] == '@') {
+ switch(rngtype) {
+ case LIMIT_RANGE_NONE:
+ if (!pam_modutil_user_in_group_nam_nam(pamh, uname, domain+1))
+ continue; /* next line */
+ break;
+ case LIMIT_RANGE_ONE:
+ if (!pam_modutil_user_in_group_nam_gid(pamh, uname, (gid_t)max_uid))
+ continue; /* next line */
+ break;
+ case LIMIT_RANGE_MM:
+ if (gid > (gid_t)max_uid)
+ continue; /* next line */
+ /* fallthrough */
+ case LIMIT_RANGE_MIN:
+ if (gid < (gid_t)min_uid)
+ continue; /* next line */
}
- fclose(fil);
- return PAM_IGNORE;
- } else if (domain[0] == '@' && _pammodutil_user_in_group_nam_nam(pamh, uname, domain+1)) {
if (ctrl & PAM_DEBUG_ARG) {
- _pam_log(LOG_DEBUG, "no limits for '%s' in group '%s'",
- uname, domain+1);
+ pam_syslog(pamh, LOG_DEBUG,
+ "no limits for '%s' in group '%s'",
+ uname, domain+1);
+ }
+ } else {
+ switch(rngtype) {
+ case LIMIT_RANGE_NONE:
+ continue; /* next line */
+ case LIMIT_RANGE_ONE:
+ if (uid != max_uid)
+ continue; /* next line */
+ break;
+ case LIMIT_RANGE_MM:
+ if (uid > max_uid)
+ continue; /* next line */
+ /* fallthrough */
+ case LIMIT_RANGE_MIN:
+ if (uid >= min_uid)
+ break;
+ continue; /* next line */
+ }
+ if (ctrl & PAM_DEBUG_ARG) {
+ pam_syslog(pamh, LOG_DEBUG, "no limits for '%s'", uname);
}
- fclose(fil);
- return PAM_IGNORE;
}
+ fclose(fil);
+ return PAM_IGNORE;
} else {
- _pam_log(LOG_DEBUG,"invalid line '%s' - skipped", buf);
+ pam_syslog(pamh, LOG_WARNING, "invalid line '%s' - skipped", line);
}
}
fclose(fil);
int status;
int retval = LIMITED_OK;
- if (uid == 0) {
- /* do not impose limits (+ve limits anyway) on the superuser */
- if (pl->priority > 0) {
- if (ctrl & PAM_DEBUG_ARG) {
- _pam_log(LOG_DEBUG, "user '%s' has UID 0 - no limits imposed",
- uname);
- }
- pl->priority = 0;
- }
- }
-
for (i=0, status=LIMITED_OK; i<RLIM_NLIMITS; i++) {
- if (pl->limits[i].limit.rlim_cur > pl->limits[i].limit.rlim_max)
- pl->limits[i].limit.rlim_cur = pl->limits[i].limit.rlim_max;
- if (!pl->supported[i]) {
+ int res;
+
+ if (!pl->limits[i].supported) {
/* skip it if its not known to the system */
continue;
}
- status |= setrlimit(i, &pl->limits[i].limit);
+ if (pl->limits[i].src_soft == LIMITS_DEF_NONE &&
+ pl->limits[i].src_hard == LIMITS_DEF_NONE) {
+ /* skip it if its not initialized */
+ continue;
+ }
+ if (pl->limits[i].limit.rlim_cur > pl->limits[i].limit.rlim_max)
+ pl->limits[i].limit.rlim_cur = pl->limits[i].limit.rlim_max;
+ res = setrlimit(i, &pl->limits[i].limit);
+ if (res != 0)
+ pam_syslog(pamh, LOG_ERR, "Could not set limit for '%s': %m",
+ rlimit2str(i));
+ status |= res;
}
if (status) {
status = setpriority(PRIO_PROCESS, 0, pl->priority);
if (status != 0) {
+ pam_syslog(pamh, LOG_ERR, "Could not set limit for PRIO_PROCESS: %m");
retval = LIMIT_ERR;
}
D(("skip login limit check for uid=0"));
} else if (pl->login_limit > 0) {
if (check_logins(pamh, uname, pl->login_limit, ctrl, pl) == LOGIN_ERR) {
+#ifdef HAVE_LIBAUDIT
+ if (!(ctrl & PAM_NO_AUDIT)) {
+ pam_modutil_audit_write(pamh, AUDIT_ANOM_LOGIN_SESSIONS,
+ "pam_limits", PAM_PERM_DENIED);
+ /* ignore return value as we fail anyway */
+ }
+#endif
retval |= LOGIN_ERR;
}
} else if (pl->login_limit == 0) {
}
/* now the session stuff */
-PAM_EXTERN int pam_sm_open_session(pam_handle_t *pamh, int flags,
- int argc, const char **argv)
+int
+pam_sm_open_session (pam_handle_t *pamh, int flags UNUSED,
+ int argc, const char **argv)
{
int retval;
+ int i;
+ int glob_rc;
char *user_name;
struct passwd *pwd;
int ctrl;
- struct pam_limit_s pl;
+ struct pam_limit_s plstruct;
+ struct pam_limit_s *pl = &plstruct;
+ glob_t globbuf;
+ const char *oldlocale;
D(("called."));
- memset(&pl, 0, sizeof(pl));
+ memset(pl, 0, sizeof(*pl));
+ memset(&globbuf, 0, sizeof(globbuf));
- ctrl = _pam_parse(argc, argv, &pl);
+ ctrl = _pam_parse(pamh, argc, argv, pl);
retval = pam_get_item( pamh, PAM_USER, (void*) &user_name );
if ( user_name == NULL || retval != PAM_SUCCESS ) {
- _pam_log(LOG_CRIT, "open_session - error recovering username");
+ pam_syslog(pamh, LOG_ERR, "open_session - error recovering username");
return PAM_SESSION_ERR;
}
- pwd = getpwnam(user_name);
+ pwd = pam_modutil_getpwnam(pamh, user_name);
if (!pwd) {
if (ctrl & PAM_DEBUG_ARG)
- _pam_log(LOG_WARNING, "open_session username '%s' does not exist",
- user_name);
- return PAM_SESSION_ERR;
+ pam_syslog(pamh, LOG_WARNING,
+ "open_session username '%s' does not exist", user_name);
+ return PAM_USER_UNKNOWN;
}
- retval = init_limits(&pl);
+ retval = init_limits(pamh, pl, ctrl);
if (retval != PAM_SUCCESS) {
- _pam_log(LOG_WARNING, "cannot initialize");
- return PAM_IGNORE;
+ pam_syslog(pamh, LOG_ERR, "cannot initialize");
+ return PAM_ABORT;
}
- retval = parse_config_file(pamh, pwd->pw_name, ctrl, &pl);
+ retval = parse_config_file(pamh, pwd->pw_name, pwd->pw_uid, pwd->pw_gid, ctrl, pl);
if (retval == PAM_IGNORE) {
- D(("the configuration file has an applicable '<domain> -' entry"));
+ D(("the configuration file ('%s') has an applicable '<domain> -' entry", CONF_FILE));
return PAM_SUCCESS;
}
- if (retval != PAM_SUCCESS) {
- _pam_log(LOG_WARNING, "error parsing the configuration file");
- return PAM_IGNORE;
+ if (retval != PAM_SUCCESS || pl->conf_file != NULL)
+ /* skip reading limits.d if config file explicitely specified */
+ goto out;
+
+ /* Read subsequent *.conf files, if they exist. */
+
+ /* set the LC_COLLATE so the sorting order doesn't depend
+ on system locale */
+
+ oldlocale = setlocale(LC_COLLATE, "C");
+ glob_rc = glob(LIMITS_CONF_GLOB, GLOB_ERR, NULL, &globbuf);
+
+ if (oldlocale != NULL)
+ setlocale (LC_COLLATE, oldlocale);
+
+ if (!glob_rc) {
+ /* Parse the *.conf files. */
+ for (i = 0; globbuf.gl_pathv[i] != NULL; i++) {
+ pl->conf_file = globbuf.gl_pathv[i];
+ retval = parse_config_file(pamh, pwd->pw_name, pwd->pw_uid, pwd->pw_gid, ctrl, pl);
+ if (retval == PAM_IGNORE) {
+ D(("the configuration file ('%s') has an applicable '<domain> -' entry", pl->conf_file));
+ globfree(&globbuf);
+ return PAM_SUCCESS;
+ }
+ if (retval != PAM_SUCCESS)
+ goto out;
+ }
}
- if (ctrl & PAM_DO_SETREUID) {
- setreuid(pwd->pw_uid, -1);
+out:
+ globfree(&globbuf);
+ if (retval != PAM_SUCCESS)
+ {
+ pam_syslog(pamh, LOG_ERR, "error parsing the configuration file: '%s' ",CONF_FILE);
+ return retval;
}
- retval = setup_limits(pamh, pwd->pw_name, pwd->pw_uid, ctrl, &pl);
+
+ retval = setup_limits(pamh, pwd->pw_name, pwd->pw_uid, ctrl, pl);
+ if (retval & LOGIN_ERR)
+ pam_error(pamh, _("There were too many logins for '%s'."),
+ pwd->pw_name);
if (retval != LIMITED_OK) {
return PAM_PERM_DENIED;
}
return PAM_SUCCESS;
}
-PAM_EXTERN int pam_sm_close_session(pam_handle_t *pamh, int flags,
- int argc, const char **argv)
+int
+pam_sm_close_session (pam_handle_t *pamh UNUSED, int flags UNUSED,
+ int argc UNUSED, const char **argv UNUSED)
{
/* nothing to do */
return PAM_SUCCESS;
}
-#ifdef PAM_STATIC
-
-/* static module data */
-
-struct pam_module _pam_limits_modstruct = {
- "pam_limits",
- NULL,
- NULL,
- NULL,
- pam_sm_open_session,
- pam_sm_close_session,
- NULL
-};
-#endif
-
/*
* Copyright (c) Cristian Gafton, 1996-1997, <gafton@redhat.com>
* All rights reserved.
projects / linux-pam / blobdiff