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Allow explicit limits for root.
Also, remove limits on su.
Index: pam.deb/modules/pam_limits/pam_limits.c
===================================================================
--- pam.deb.orig/modules/pam_limits/pam_limits.c
+++ pam.deb/modules/pam_limits/pam_limits.c
@@ -55,6 +55,10 @@
#define LIMITS_DEF_DEFAULT 4 /* limit was set by an default entry */
#define LIMITS_DEF_NONE 5 /* this limit was not set yet */
+/* file in /proc on Linux that we read to get the total number of open
+ files allowed on the system */
+#define NR_OPEN_FILES "/proc/sys/fs/nr_open"
+
static const char *limits_def_names[] = {
"USER",
"GROUP",
@@ -74,6 +78,7 @@
/* internal data */
struct pam_limit_s {
+ int root; /* running as root? */
int login_limit; /* the max logins limit */
int login_limit_def; /* which entry set the login limit */
int flag_numsyslogins; /* whether to limit logins only for a
@@ -228,9 +233,25 @@
{
int i;
int retval = PAM_SUCCESS;
+ static rlim_t nofiles_max = RLIM_INFINITY;
+ static int nofiles_init = 0;
D(("called."));
+ if (nofiles_init == 0) {
+ FILE *nr_open;
+ unsigned long long ull_nofiles = 0;
+
+ nofiles_init = 1;
+ nr_open = fopen(NR_OPEN_FILES, "r");
+ if (nr_open != NULL) {
+ if (fscanf(nr_open, "%Lu", &ull_nofiles) == 1)
+ nofiles_max = ull_nofiles;
+ fclose(nr_open);
+ }
+ }
+
+ pl->root = 0;
for(i = 0; i < RLIM_NLIMITS; i++) {
int r = getrlimit(i, &pl->limits[i].limit);
if (r == -1) {
@@ -240,8 +261,53 @@
}
} else {
pl->limits[i].supported = 1;
- pl->limits[i].src_soft = LIMITS_DEF_NONE;
- pl->limits[i].src_hard = LIMITS_DEF_NONE;
+ pl->limits[i].src_soft = LIMITS_DEF_ALL;
+ pl->limits[i].src_hard = LIMITS_DEF_ALL;
+ switch(i) {
+ case RLIMIT_CPU:
+ case RLIMIT_FSIZE:
+ case RLIMIT_DATA:
+ case RLIMIT_RSS:
+ case RLIMIT_NPROC:
+ case RLIMIT_MEMLOCK:
+#ifdef RLIMIT_AS
+ case RLIMIT_AS:
+#endif
+#ifdef RLIMIT_LOCKS
+ case RLIMIT_LOCKS:
+#endif
+ pl->limits[i].limit.rlim_cur = RLIM_INFINITY;
+ pl->limits[i].limit.rlim_max = RLIM_INFINITY;
+ break;
+#ifdef RLIMIT_SIGPENDING
+ case RLIMIT_SIGPENDING:
+ pl->limits[i].limit.rlim_cur = 16382;
+ pl->limits[i].limit.rlim_max = 16382;
+ break;
+#endif
+#ifdef RLIMIT_MSGQUEUE
+ case RLIMIT_MSGQUEUE:
+ pl->limits[i].limit.rlim_cur = 819200;
+ pl->limits[i].limit.rlim_max = 819200;
+ break;
+#endif
+ case RLIMIT_CORE:
+ pl->limits[i].limit.rlim_cur = 0;
+ pl->limits[i].limit.rlim_max = RLIM_INFINITY;
+ break;
+ case RLIMIT_STACK:
+ pl->limits[i].limit.rlim_cur = 8192*1024;
+ pl->limits[i].limit.rlim_max = RLIM_INFINITY;
+ break;
+ case RLIMIT_NOFILE:
+ pl->limits[i].limit.rlim_cur = 1024;
+ pl->limits[i].limit.rlim_max = nofiles_max;
+ break;
+ default:
+ pl->limits[i].src_soft = LIMITS_DEF_NONE;
+ pl->limits[i].src_hard = LIMITS_DEF_NONE;
+ break;
+ }
}
}
@@ -524,7 +590,7 @@
if (strcmp(uname, domain) == 0) /* this user have a limit */
process_limit(pamh, LIMITS_DEF_USER, ltype, item, value, ctrl, pl);
- else if (domain[0]=='@') {
+ else if (domain[0]=='@' && !pl->root) {
if (ctrl & PAM_DEBUG_ARG) {
pam_syslog(pamh, LOG_DEBUG,
"checking if %s is in group %s",
@@ -533,7 +599,7 @@
if (pam_modutil_user_in_group_nam_nam(pamh, uname, domain+1))
process_limit(pamh, LIMITS_DEF_GROUP, ltype, item, value, ctrl,
pl);
- } else if (domain[0]=='%') {
+ } else if (domain[0]=='%' && !pl->root) {
if (ctrl & PAM_DEBUG_ARG) {
pam_syslog(pamh, LOG_DEBUG,
"checking if %s is in group %s",
@@ -547,7 +613,7 @@
process_limit(pamh, LIMITS_DEF_ALLGROUP, ltype, item, value, ctrl,
pl);
}
- } else if (strcmp(domain, "*") == 0)
+ } else if (strcmp(domain, "*") == 0 && !pl->root)
process_limit(pamh, LIMITS_DEF_DEFAULT, ltype, item, value, ctrl,
pl);
} else if (i == 2 && ltype[0] == '-') { /* Probably a no-limit line */
@@ -582,6 +648,12 @@
int status;
int retval = LIMITED_OK;
+ if (uid == 0) {
+ /* do not impose +ve priority limits on the superuser */
+ if (pl->priority > 0)
+ pl->priority = 0;
+ }
+
for (i=0, status=LIMITED_OK; i<RLIM_NLIMITS; i++) {
if (!pl->limits[i].supported) {
/* skip it if its not known to the system */
@@ -675,6 +747,8 @@
return PAM_ABORT;
}
+ if (pwd->pw_uid == 0)
+ pl->root = 1;
retval = parse_config_file(pamh, pwd->pw_name, ctrl, pl);
if (retval == PAM_IGNORE) {
D(("the configuration file ('%s') has an applicable '<domain> -' entry", CONF_FILE));
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