diff options
Diffstat (limited to 'modules/pam_unix/unix_chkpwd.c')
| -rw-r--r-- | modules/pam_unix/unix_chkpwd.c | 61 |
1 files changed, 56 insertions, 5 deletions
diff --git a/modules/pam_unix/unix_chkpwd.c b/modules/pam_unix/unix_chkpwd.c index 5f872d27..61675ed2 100644 --- a/modules/pam_unix/unix_chkpwd.c +++ b/modules/pam_unix/unix_chkpwd.c @@ -24,6 +24,10 @@ #include <shadow.h> #include <signal.h> #include <time.h> +#include <errno.h> +#ifdef HAVE_LIBAUDIT +#include <libaudit.h> +#endif #include <security/_pam_types.h> #include <security/_pam_macros.h> @@ -43,7 +47,7 @@ static int _check_expiry(const char *uname) printf("-1\n"); return retval; } - + if (spent == NULL) { printf("-1\n"); return retval; @@ -54,6 +58,35 @@ static int _check_expiry(const char *uname) return retval; } +#ifdef HAVE_LIBAUDIT +static int _audit_log(int type, const char *uname, int rc) +{ + int audit_fd; + + audit_fd = audit_open(); + if (audit_fd < 0) { + /* You get these error codes only when the kernel doesn't have + * audit compiled in. */ + if (errno == EINVAL || errno == EPROTONOSUPPORT || + errno == EAFNOSUPPORT) + return PAM_SUCCESS; + + helper_log_err(LOG_CRIT, "audit_open() failed: %m"); + return PAM_AUTH_ERR; + } + + rc = audit_log_acct_message(audit_fd, type, NULL, "PAM:unix_chkpwd", + uname, -1, NULL, NULL, NULL, rc == PAM_SUCCESS); + if (rc == -EPERM && geteuid() != 0) { + rc = 0; + } + + audit_close(audit_fd); + + return rc < 0 ? PAM_AUTH_ERR : PAM_SUCCESS; +} +#endif + int main(int argc, char *argv[]) { char pass[MAXPASS + 1]; @@ -82,6 +115,9 @@ int main(int argc, char *argv[]) helper_log_err(LOG_NOTICE ,"inappropriate use of Unix helper binary [UID=%d]" ,getuid()); +#ifdef HAVE_LIBAUDIT + _audit_log(AUDIT_ANOM_EXEC, getuidname(getuid()), PAM_SYSTEM_ERR); +#endif fprintf(stderr ,"This binary is not designed for running in this way\n" "-- the system administrator has been informed\n"); @@ -112,15 +148,18 @@ int main(int argc, char *argv[]) if (strcmp(option, "chkexpiry") == 0) /* Check account information from the shadow file */ - return _check_expiry(argv[1]); + return _check_expiry(argv[1]); /* read the nullok/nonull option */ else if (strcmp(option, "nullok") == 0) nullok = 1; else if (strcmp(option, "nonull") == 0) nullok = 0; - else + else { +#ifdef HAVE_LIBAUDIT + _audit_log(AUDIT_ANOM_EXEC, getuidname(getuid()), PAM_SYSTEM_ERR); +#endif return PAM_SYSTEM_ERR; - + } /* read the password from stdin (a pipe from the pam_unix module) */ npass = read_passwords(STDIN_FILENO, 1, passwords); @@ -141,11 +180,23 @@ int main(int argc, char *argv[]) /* return pass or fail */ if (retval != PAM_SUCCESS) { - if (!nullok || !blankpass) + if (!nullok || !blankpass) { /* no need to log blank pass test */ +#ifdef HAVE_LIBAUDIT + if (getuid() != 0) + _audit_log(AUDIT_USER_AUTH, user, PAM_AUTH_ERR); +#endif helper_log_err(LOG_NOTICE, "password check failed for user (%s)", user); + } return PAM_AUTH_ERR; } else { + if (getuid() != 0) { +#ifdef HAVE_LIBAUDIT + return _audit_log(AUDIT_USER_AUTH, user, PAM_SUCCESS); +#else + return PAM_SUCCESS; +#endif + } return PAM_SUCCESS; } } |