diff options
Diffstat (limited to 'modules/pam_sepermit')
| -rw-r--r-- | modules/pam_sepermit/pam_sepermit.c | 36 |
1 files changed, 35 insertions, 1 deletions
diff --git a/modules/pam_sepermit/pam_sepermit.c b/modules/pam_sepermit/pam_sepermit.c index f7998457..8af1266a 100644 --- a/modules/pam_sepermit/pam_sepermit.c +++ b/modules/pam_sepermit/pam_sepermit.c @@ -162,6 +162,40 @@ check_running (pam_handle_t *pamh, uid_t uid, int killall, int debug) return running; } +/* + * This function reads the loginuid from the /proc system. It returns + * (uid_t)-1 on failure. + */ +static uid_t get_loginuid(pam_handle_t *pamh) +{ + int fd, count; + char loginuid[24]; + char *eptr; + uid_t rv = (uid_t)-1; + + fd = open("/proc/self/loginuid", O_NOFOLLOW|O_RDONLY); + if (fd < 0) { + if (errno != ENOENT) { + pam_syslog(pamh, LOG_ERR, + "Cannot open /proc/self/loginuid: %m"); + } + return rv; + } + if ((count = pam_modutil_read(fd, loginuid, sizeof(loginuid)-1)) < 1) { + close(fd); + return rv; + } + loginuid[count] = '\0'; + close(fd); + + errno = 0; + rv = strtoul(loginuid, &eptr, 10); + if (errno != 0 || eptr == loginuid) + rv = (uid_t) -1; + + return rv; +} + static void sepermit_unlock(pam_handle_t *pamh, void *plockfd, int error_status UNUSED) { @@ -319,7 +353,7 @@ sepermit_match(pam_handle_t *pamh, const char *cfgfile, const char *user, if (*sense == PAM_SUCCESS) { if (ignore) *sense = PAM_IGNORE; - if (geteuid() == 0 && exclusive) + if (geteuid() == 0 && exclusive && get_loginuid(pamh) == -1) if (sepermit_lock(pamh, user, debug) < 0) *sense = PAM_AUTH_ERR; } |