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105 lines
2.3 KiB
C
105 lines
2.3 KiB
C
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/* pam_apparmor module */
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/*
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* Modified for pam_motd by Ben Collins <bcollins@debian.org>
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*
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* Based off of:
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* $Id: pam_motd.c,v 1.11 2005/09/21 10:01:01 t8m Exp $
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*
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* Written by Michael K. Johnson <johnsonm@redhat.com> 1996/10/24
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*
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*/
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <pwd.h>
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#include <security/_pam_macros.h>
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/*
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* here, we make a definition for the externally accessible function
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* in this file (this definition is required for static a module
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* but strongly encouraged generally) it is used to instruct the
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* modules include file to define the function prototypes.
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*/
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#define PAM_SM_SESSION
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#include <security/pam_modules.h>
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/* --- session management functions (only) --- */
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PAM_EXTERN int
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pam_sm_close_session (pam_handle_t *pamh, int flags,
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int argc, const char **argv)
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{
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return PAM_IGNORE;
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}
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PAM_EXTERN
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int pam_sm_open_session(pam_handle_t *pamh, int flags,
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int argc, const char **argv)
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{
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int fd, retval = PAM_IGNORE;
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unsigned int magic_token = 0xDEADC0ED;
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const void *user;
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/* grab the target user name */
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retval = pam_get_item(pamh, PAM_USER, &user);
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if (retval != PAM_SUCCESS || user == NULL || *(const char *)user == '\0') {
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return PAM_USER_UNKNOWN;
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}
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fd = open("/dev/urandom", O_RDONLY);
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if (fd < 0) {
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return PAM_PERM_DENIED;
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}
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retval = read(fd, (void *) &magic_token, sizeof(magic_token));
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close(fd);
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/* change into the user hat */
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retval = change_hat(user, magic_token);
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if (retval < 0) {
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/* failed to change into user hat, so we'll jump back out */
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retval = change_hat(NULL, magic_token);
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if (retval == 0) {
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/* and try to change to the DEFAULT hat instead */
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retval = change_hat("DEFAULT", magic_token);
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if (retval < 0) {
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/* failed to change into default hat, so we'll
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jump back out */
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retval = change_hat(NULL, magic_token);
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}
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}
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}
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/* zero out the magic token so we can't get back out */
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memset(&magic_token, 0, sizeof(magic_token));
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return PAM_SUCCESS;
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}
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#ifdef PAM_STATIC
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/* static module data */
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struct pam_module _pam_apparmor_modstruct = {
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"pam_apparmor",
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NULL,
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NULL,
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NULL,
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pam_sm_open_session,
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pam_sm_close_session,
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NULL,
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};
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#endif
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/* end of module definition */
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