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authorAndrew G. Morgan <morgan@kernel.org>2000-06-20 22:10:38 +0000
committerAndrew G. Morgan <morgan@kernel.org>2000-06-20 22:10:38 +0000
commitea488580c42e8918445a945484de3c8a5addc761 (patch)
treec992f3ba699caafedfadc16af38e6359c3c24698 /examples/blank.c
Initial revision
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+/*
+ * $Id$
+ *
+ * $Log$
+ * Revision 1.1 2000/06/20 22:11:13 agmorgan
+ * Initial revision
+ *
+ * Revision 1.2 1999/11/08 05:39:53 morgan
+ * removed void main def which was making gcc complain
+ *
+ * Revision 1.1.1.1 1998/07/12 05:17:14 morgan
+ * Linux PAM sources pre-0.66
+ *
+ * Revision 1.7 1996/12/01 03:16:53 morgan
+ * added setcred closing function
+ *
+ * Revision 1.6 1996/11/10 19:51:40 morgan
+ * minor change to avoid gcc warning
+ *
+ * Revision 1.5 1996/07/07 23:53:05 morgan
+ * added optional fail delay (non-standard Linux-PAM)
+ *
+ * Revision 1.4 1996/05/02 04:44:18 morgan
+ * moved conversation to a libmisc library routine.
+ *
+ *
+ */
+
+/* Andrew Morgan (morgan@parc.power.net) -- a self contained `blank'
+ * application
+ *
+ * I am not very proud of this code. It makes use of a possibly ill-
+ * defined pamh pointer to call pam_strerror() with. The reason that
+ * I was sloppy with this is historical (pam_strerror, prior to 0.59,
+ * did not require a pamh argument) and if this program is used as a
+ * model for anything, I should wish that you will take this error into
+ * account.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include <security/pam_appl.h>
+#include <security/pam_misc.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;
+ char *username=NULL;
+ int retcode;
+
+ /* did the user call with a username as an argument ? */
+
+ if (argc > 2) {
+ fprintf(stderr,"usage: %s [username]\n",argv[0]);
+ } else if (argc == 2) {
+ username = argv[1];
+ }
+
+ /* initialize the Linux-PAM library */
+ retcode = pam_start("blank", username, &conv, &pamh);
+ bail_out(pamh,1,retcode,"pam_start");
+
+ /* test the environment stuff */
+ {
+#define MAXENV 15
+ const char *greek[MAXENV] = {
+ "a=alpha", "b=beta", "c=gamma", "d=delta", "e=epsilon",
+ "f=phi", "g=psi", "h=eta", "i=iota", "j=mu", "k=nu",
+ "l=zeta", "h=", "d", "k=xi"
+ };
+ char **env;
+ int i;
+
+ for (i=0; i<MAXENV; ++i) {
+ retcode = pam_putenv(pamh,greek[i]);
+ bail_out(pamh,0,retcode,"pam_putenv");
+ }
+ env = pam_getenvlist(pamh);
+ if (env)
+ env = pam_misc_drop_env(env);
+ else
+ fprintf(stderr,"???\n");
+ fprintf(stderr,"a test: c=[%s], j=[%s]\n"
+ , pam_getenv(pamh, "c"), pam_getenv(pamh, "j"));
+ }
+
+ /* 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_setcred1");
+
+ 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;
+ }
+
+ fprintf(stderr,"The user has been authenticated and `logged in'\n");
+
+ /* 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;
+ }
+
+ retcode = pam_setcred(pamh, PAM_DELETE_CRED);
+ bail_out(pamh,0,retcode,"pam_setcred2");
+
+ 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);
+}