diff options
Diffstat (limited to 'modules/pam_exec/pam_exec.c')
| -rw-r--r-- | modules/pam_exec/pam_exec.c | 34 |
1 files changed, 9 insertions, 25 deletions
diff --git a/modules/pam_exec/pam_exec.c b/modules/pam_exec/pam_exec.c index b56e4b26..12c44444 100644 --- a/modules/pam_exec/pam_exec.c +++ b/modules/pam_exec/pam_exec.c @@ -302,6 +302,10 @@ call_exec (const char *pam_type, pam_handle_t *pamh, char **envlist, **tmp; int envlen, nitems; char *envstr; + enum pam_modutil_redirect_fd redirect_stdin = + expose_authtok ? PAM_MODUTIL_IGNORE_FD : PAM_MODUTIL_PIPE_FD; + enum pam_modutil_redirect_fd redirect_stdout = + (use_stdout || logfile) ? PAM_MODUTIL_IGNORE_FD : PAM_MODUTIL_NULL_FD; /* First, move all the pipes off of stdin, stdout, and stderr, to ensure * that calls to dup2 won't close them. */ @@ -330,18 +334,6 @@ call_exec (const char *pam_type, pam_handle_t *pamh, _exit (err); } } - else - { - close (STDIN_FILENO); - - /* New stdin. */ - if ((i = open ("/dev/null", O_RDWR)) < 0) - { - int err = errno; - pam_syslog (pamh, LOG_ERR, "open of /dev/null failed: %m"); - _exit (err); - } - } /* Set up stdout. */ @@ -374,26 +366,18 @@ call_exec (const char *pam_type, pam_handle_t *pamh, free (buffer); } } - else - { - close (STDOUT_FILENO); - if ((i = open ("/dev/null", O_RDWR)) < 0) - { - int err = errno; - pam_syslog (pamh, LOG_ERR, "open of /dev/null failed: %m"); - _exit (err); - } - } - if (dup2 (STDOUT_FILENO, STDERR_FILENO) == -1) + if ((use_stdout || logfile) && + dup2 (STDOUT_FILENO, STDERR_FILENO) == -1) { int err = errno; pam_syslog (pamh, LOG_ERR, "dup2 failed: %m"); _exit (err); } - for (i = 3; i < sysconf (_SC_OPEN_MAX); i++) - close (i); + if (pam_modutil_sanitize_helper_fds(pamh, redirect_stdin, + redirect_stdout, redirect_stdout) < 0) + _exit(1); if (call_setuid) if (setuid (geteuid ()) == -1) |