diff options
Diffstat (limited to 'libpam/pam_start.c')
| -rw-r--r-- | libpam/pam_start.c | 139 |
1 files changed, 139 insertions, 0 deletions
diff --git a/libpam/pam_start.c b/libpam/pam_start.c new file mode 100644 index 0000000..b7cd771 --- /dev/null +++ b/libpam/pam_start.c @@ -0,0 +1,139 @@ +/* pam_start.c */ + +/* Creator Marc Ewing + * Maintained by AGM + * + * $Id$ + * + */ + +#include "pam_private.h" + +#include <ctype.h> +#include <stdlib.h> +#include <unistd.h> +#include <string.h> +#include <syslog.h> + +int pam_start ( + const char *service_name, + const char *user, + const struct pam_conv *pam_conversation, + pam_handle_t **pamh) +{ + D(("called pam_start: [%s] [%s] [%p] [%p]" + ,service_name, user, pam_conversation, pamh)); + + if (pamh == NULL) { + pam_syslog(NULL, LOG_CRIT, + "pam_start: invalid argument: pamh == NULL"); + return (PAM_SYSTEM_ERR); + } + + if (service_name == NULL) { + pam_syslog(NULL, LOG_CRIT, + "pam_start: invalid argument: service == NULL"); + return (PAM_SYSTEM_ERR); + } + + if (pam_conversation == NULL) { + pam_syslog(NULL, LOG_CRIT, + "pam_start: invalid argument: conv == NULL"); + return (PAM_SYSTEM_ERR); + } + + if ((*pamh = calloc(1, sizeof(**pamh))) == NULL) { + pam_syslog(NULL, LOG_CRIT, "pam_start: calloc failed for *pamh"); + return (PAM_BUF_ERR); + } + + /* All service names should be files below /etc/pam.d and nothing + else. Forbid paths. */ + if (strrchr(service_name, '/') != NULL) + service_name = strrchr(service_name, '/') + 1; + + /* Mark the caller as the application - permission to do certain + things is limited to a module or an application */ + + __PAM_TO_APP(*pamh); + + if (((*pamh)->service_name = _pam_strdup(service_name)) == NULL) { + pam_syslog(*pamh, LOG_CRIT, + "pam_start: _pam_strdup failed for service name"); + _pam_drop(*pamh); + return (PAM_BUF_ERR); + } else { + char *tmp; + + for (tmp=(*pamh)->service_name; *tmp; ++tmp) + *tmp = tolower(*tmp); /* require lower case */ + } + + if (user) { + if (((*pamh)->user = _pam_strdup(user)) == NULL) { + pam_syslog(*pamh, LOG_CRIT, + "pam_start: _pam_strdup failed for user"); + _pam_drop((*pamh)->service_name); + _pam_drop(*pamh); + return (PAM_BUF_ERR); + } + } else + (*pamh)->user = NULL; + + (*pamh)->tty = NULL; + (*pamh)->prompt = NULL; /* prompt for pam_get_user() */ + (*pamh)->ruser = NULL; + (*pamh)->rhost = NULL; + (*pamh)->authtok = NULL; + (*pamh)->oldauthtok = NULL; + (*pamh)->fail_delay.delay_fn_ptr = NULL; + (*pamh)->former.choice = PAM_NOT_STACKED; + (*pamh)->former.substates = NULL; +#ifdef HAVE_LIBAUDIT + (*pamh)->audit_state = 0; +#endif + (*pamh)->xdisplay = NULL; + (*pamh)->authtok_type = NULL; + memset (&((*pamh)->xauth), 0, sizeof ((*pamh)->xauth)); + + if (((*pamh)->pam_conversation = (struct pam_conv *) + malloc(sizeof(struct pam_conv))) == NULL) { + pam_syslog(*pamh, LOG_CRIT, "pam_start: malloc failed for pam_conv"); + _pam_drop((*pamh)->service_name); + _pam_drop((*pamh)->user); + _pam_drop(*pamh); + return (PAM_BUF_ERR); + } else { + memcpy((*pamh)->pam_conversation, pam_conversation, + sizeof(struct pam_conv)); + } + + (*pamh)->data = NULL; + if ( _pam_make_env(*pamh) != PAM_SUCCESS ) { + pam_syslog(*pamh,LOG_ERR,"pam_start: failed to initialize environment"); + _pam_drop((*pamh)->service_name); + _pam_drop((*pamh)->user); + _pam_drop(*pamh); + return PAM_ABORT; + } + + _pam_reset_timer(*pamh); /* initialize timer support */ + + _pam_start_handlers(*pamh); /* cannot fail */ + + /* According to the SunOS man pages, loading modules and resolving + * symbols happens on the first call from the application. */ + + if ( _pam_init_handlers(*pamh) != PAM_SUCCESS ) { + pam_syslog(*pamh, LOG_ERR, "pam_start: failed to initialize handlers"); + _pam_drop_env(*pamh); /* purge the environment */ + _pam_drop((*pamh)->service_name); + _pam_drop((*pamh)->user); + _pam_drop(*pamh); + return PAM_ABORT; + } + + D(("exiting pam_start successfully")); + + return PAM_SUCCESS; +} |