diff options
Diffstat (limited to 'examples/xsh.c')
| -rw-r--r-- | examples/xsh.c | 177 |
1 files changed, 0 insertions, 177 deletions
diff --git a/examples/xsh.c b/examples/xsh.c deleted file mode 100644 index fdbbbfd0..00000000 --- a/examples/xsh.c +++ /dev/null @@ -1,177 +0,0 @@ -/* - * $Id$ - */ - -/* Andrew Morgan (morgan@kernel.org) -- an example application - * that invokes a shell, based on blank.c */ - -#include <stdio.h> -#include <stdlib.h> - -#include <security/pam_appl.h> -#include <security/pam_misc.h> - -#include <security/_pam_aconf.h> - -#include <pwd.h> -#include <sys/types.h> -#include <unistd.h> - -/* ------ some local (static) functions ------- */ - -static void bail_out(pam_handle_t *pamh,int really, int code, const char *fn) -{ - fprintf(stderr,"==> called %s()\n got: `%s'\n", fn, - pam_strerror(pamh,code)); - if (really && code) - exit (1); -} - -/* ------ some static data objects ------- */ - -static struct pam_conv conv = { - misc_conv, - NULL -}; - -/* ------- the application itself -------- */ - -int main(int argc, char **argv) -{ - pam_handle_t *pamh=NULL; - const char *username=NULL; - const char *service="xsh"; - int retcode; - - /* did the user call with a username as an argument ? - * did they also */ - - if (argc > 3) { - fprintf(stderr,"usage: %s [username [service-name]]\n",argv[0]); - } - if ((argc >= 2) && (argv[1][0] != '-')) { - username = argv[1]; - } - if (argc == 3) { - service = argv[2]; - } - - /* initialize the Linux-PAM library */ - retcode = pam_start(service, username, &conv, &pamh); - bail_out(pamh,1,retcode,"pam_start"); - - /* fill in the RUSER and RHOST etc. fields */ - { - char buffer[100]; - struct passwd *pw; - const char *tty; - - pw = getpwuid(getuid()); - if (pw != NULL) { - retcode = pam_set_item(pamh, PAM_RUSER, pw->pw_name); - bail_out(pamh,1,retcode,"pam_set_item(PAM_RUSER)"); - } - - retcode = gethostname(buffer, sizeof(buffer)-1); - if (retcode) { - perror("failed to look up hostname"); - retcode = pam_end(pamh, PAM_ABORT); - bail_out(pamh,1,retcode,"pam_end"); - } - retcode = pam_set_item(pamh, PAM_RHOST, buffer); - bail_out(pamh,1,retcode,"pam_set_item(PAM_RHOST)"); - - tty = ttyname(fileno(stdin)); - if (tty) { - retcode = pam_set_item(pamh, PAM_TTY, tty); - bail_out(pamh,1,retcode,"pam_set_item(PAM_RHOST)"); - } - } - - /* to avoid using goto we abuse a loop here */ - for (;;) { - /* authenticate the user --- `0' here, could have been PAM_SILENT - * | PAM_DISALLOW_NULL_AUTHTOK */ - - retcode = pam_authenticate(pamh, 0); - bail_out(pamh,0,retcode,"pam_authenticate"); - - /* has the user proved themself valid? */ - if (retcode != PAM_SUCCESS) { - fprintf(stderr,"%s: invalid request\n",argv[0]); - break; - } - - /* the user is valid, but should they have access at this - time? */ - - retcode = pam_acct_mgmt(pamh, 0); /* `0' could be as above */ - bail_out(pamh,0,retcode,"pam_acct_mgmt"); - - if (retcode == PAM_NEW_AUTHTOK_REQD) { - fprintf(stderr,"Application must request new password...\n"); - retcode = pam_chauthtok(pamh,PAM_CHANGE_EXPIRED_AUTHTOK); - bail_out(pamh,0,retcode,"pam_chauthtok"); - } - - if (retcode != PAM_SUCCESS) { - fprintf(stderr,"%s: invalid request\n",argv[0]); - break; - } - - /* `0' could be as above */ - retcode = pam_setcred(pamh, PAM_ESTABLISH_CRED); - bail_out(pamh,0,retcode,"pam_setcred"); - - if (retcode != PAM_SUCCESS) { - fprintf(stderr,"%s: problem setting user credentials\n" - ,argv[0]); - break; - } - - /* open a session for the user --- `0' could be PAM_SILENT */ - retcode = pam_open_session(pamh,0); - bail_out(pamh,0,retcode,"pam_open_session"); - if (retcode != PAM_SUCCESS) { - fprintf(stderr,"%s: problem opening a session\n",argv[0]); - break; - } - - pam_get_item(pamh, PAM_USER, (const void **) &username); - fprintf(stderr, - "The user [%s] has been authenticated and `logged in'\n", - username); - - /* this is always a really bad thing for security! */ - system("/bin/sh"); - - /* close a session for the user --- `0' could be PAM_SILENT - * it is possible that this pam_close_call is in another program.. - */ - - retcode = pam_close_session(pamh,0); - bail_out(pamh,0,retcode,"pam_close_session"); - if (retcode != PAM_SUCCESS) { - fprintf(stderr,"%s: problem closing a session\n",argv[0]); - break; - } - - /* `0' could be as above */ - retcode = pam_setcred(pamh, PAM_DELETE_CRED); - bail_out(pamh,0,retcode,"pam_setcred"); - if (retcode != PAM_SUCCESS) { - fprintf(stderr,"%s: problem deleting user credentials\n" - ,argv[0]); - break; - } - - break; /* don't go on for ever! */ - } - - /* close the Linux-PAM library */ - retcode = pam_end(pamh, PAM_SUCCESS); - pamh = NULL; - bail_out(pamh,1,retcode,"pam_end"); - - exit(0); -} |