granicus.if.org Git - linux-pam/blob - libpam/pam_start.c

   1 /* pam_start.c */
   2
   3 /* Creator Marc Ewing
   4  * Maintained by AGM
   5  *
   6  * $Id$
   7  *
   8  */
   9
  10 #include <ctype.h>
  11 #include <stdlib.h>
  12 #include <unistd.h>
  13 #include <string.h>
  14 #include <syslog.h>
  15
  16 #include "pam_private.h"
  17
  18 int pam_start (
  19     const char *service_name,
  20     const char *user,
  21     const struct pam_conv *pam_conversation,
  22     pam_handle_t **pamh)
  23 {
  24     D(("called pam_start: [%s] [%s] [%p] [%p]"
  25        ,service_name, user, pam_conversation, pamh));
  26
  27     if ((*pamh = calloc(1, sizeof(**pamh))) == NULL) {
  28         _pam_system_log(LOG_CRIT, "pam_start: calloc failed for *pamh");
  29         return (PAM_BUF_ERR);
  30     }
  31
  32     /* Mark the caller as the application - permission to do certain
  33        things is limited to a module or an application */
  34
  35     __PAM_TO_APP(*pamh);
  36
  37     if (service_name) {
  38         char *tmp;
  39
  40         if (((*pamh)->service_name = _pam_strdup(service_name)) == NULL) {
  41             _pam_system_log(LOG_CRIT,
  42                             "pam_start: _pam_strdup failed for service name");
  43             _pam_drop(*pamh);
  44             return (PAM_BUF_ERR);
  45         }
  46         for (tmp=(*pamh)->service_name; *tmp; ++tmp)
  47             *tmp = tolower(*tmp);                   /* require lower case */
  48     } else
  49         (*pamh)->service_name = NULL;
  50
  51     if (user) {
  52         if (((*pamh)->user = _pam_strdup(user)) == NULL) {
  53             _pam_system_log(LOG_CRIT,
  54                             "pam_start: _pam_strdup failed for user");
  55             _pam_drop((*pamh)->service_name);
  56             _pam_drop(*pamh);
  57             return (PAM_BUF_ERR);
  58         }
  59     } else
  60         (*pamh)->user = NULL;
  61
  62     (*pamh)->tty = NULL;
  63     (*pamh)->prompt = NULL;              /* prompt for pam_get_user() */
  64     (*pamh)->ruser = NULL;
  65     (*pamh)->rhost = NULL;
  66     (*pamh)->authtok = NULL;
  67     (*pamh)->oldauthtok = NULL;
  68     (*pamh)->fail_delay.delay_fn_ptr = NULL;
  69     (*pamh)->former.choice = PAM_NOT_STACKED;
  70
  71     if (pam_conversation == NULL
  72         || ((*pamh)->pam_conversation = (struct pam_conv *)
  73             malloc(sizeof(struct pam_conv))) == NULL) {
  74         _pam_system_log(LOG_CRIT, "pam_start: malloc failed for pam_conv");
  75         _pam_drop((*pamh)->service_name);
  76         _pam_drop((*pamh)->user);
  77         _pam_drop(*pamh);
  78         return (PAM_BUF_ERR);
  79     } else {
  80         memcpy((*pamh)->pam_conversation, pam_conversation,
  81                sizeof(struct pam_conv));
  82     }
  83
  84     (*pamh)->data = NULL;
  85     if ( _pam_make_env(*pamh) != PAM_SUCCESS ) {
  86         _pam_system_log(LOG_ERR,"pam_start: failed to initialize environment");
  87         _pam_drop((*pamh)->service_name);
  88         _pam_drop((*pamh)->user);
  89         _pam_drop(*pamh);
  90         return PAM_ABORT;
  91     }
  92
  93     _pam_reset_timer(*pamh);         /* initialize timer support */
  94
  95     _pam_start_handlers(*pamh);                   /* cannot fail */
  96
  97     /* According to the SunOS man pages, loading modules and resolving
  98      * symbols happens on the first call from the application. */
  99
 100     if ( _pam_init_handlers(*pamh) != PAM_SUCCESS ) {
 101         _pam_system_log(LOG_ERR, "pam_start: failed to initialize handlers");
 102         _pam_drop_env(*pamh);                 /* purge the environment */
 103         _pam_drop((*pamh)->service_name);
 104         _pam_drop((*pamh)->user);
 105         _pam_drop(*pamh);
 106         return PAM_ABORT;
 107     }
 108
 109     D(("exiting pam_start successfully"));
 110
 111     return PAM_SUCCESS;
 112 }