From efd31890b5ed496a5a00c08a262da240e66a4ddc Mon Sep 17 00:00:00 2001
From: Steve Langasek <steve.langasek@ubuntu.com>
Date: Thu, 3 Jan 2019 12:44:11 -0800
Subject: New upstream version 0.76

---
 Linux-PAM/examples/blank.c | 158 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 158 insertions(+)
 create mode 100644 Linux-PAM/examples/blank.c

(limited to 'Linux-PAM/examples/blank.c')

diff --git a/Linux-PAM/examples/blank.c b/Linux-PAM/examples/blank.c
new file mode 100644
index 00000000..e4129b4b
--- /dev/null
+++ b/Linux-PAM/examples/blank.c
@@ -0,0 +1,158 @@
+/*
+ * $Id: blank.c,v 1.1.1.1 2001/04/29 04:17:04 hartmans Exp $
+ */
+
+/* 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);
+}
-- 
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