Relevant BUGIDs:

Purpose of commit:

Commit summary:
---------------

new feature: Bug 436444: Add pam_localuser module

1 files changed, 160 insertions, 0 deletions

diff --git a/modules/pam_localuser/pam_localuser.c b/modules/pam_localuser/pam_localuser.c
new file mode 100644
index 00000000..f16e81d5
--- /dev/null
+++ b/modules/pam_localuser/pam_localuser.c
@@ -0,0 +1,160 @@
+/*
+ * Copyright 2001 Red Hat, Inc.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, and the entire permission notice in its entirety,
+ *    including the disclaimer of warranties.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote
+ *    products derived from this software without specific prior
+ *    written permission.
+ *
+ * ALTERNATIVELY, this product may be distributed under the terms of
+ * the GNU Public License, in which case the provisions of the GPL are
+ * required INSTEAD OF the above restrictions.  (This clause is
+ * necessary due to a potential bad interaction between the GPL and
+ * the restrictions contained in a BSD-style copyright.)
+ *
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
+ * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "../../_pam_aconf.h"
+
+#include <errno.h>
+#include <limits.h>
+#include <stdlib.h>
+#include <string.h>
+#include <syslog.h>
+#include <stdio.h>
+#include <stdarg.h>
+#include <time.h>
+#include <unistd.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+
+#define PAM_SM_AUTH
+#define PAM_SM_ACCOUNT
+#include "../../libpam/include/security/pam_modules.h"
+#include "../../libpam/include/security/_pam_macros.h"
+
+#define MODULE_NAME "pam_localuser"
+
+PAM_EXTERN
+int pam_sm_authenticate(pam_handle_t *pamh, int flags, int argc, const char **argv)
+{
+	int i, ret = PAM_SUCCESS;
+	FILE *fp;
+	int debug = 0;
+	char filename[PATH_MAX] = "/etc/passwd";
+	char line[LINE_MAX], name[LINE_MAX];
+	const char* user;
+
+	/* process arguments */
+	for(i = 0; i < argc; i++) {
+		if(strcmp("debug", argv[i]) == 0) {
+			debug = 1;
+		}
+	}
+	for(i = 0; i < argc; i++) {
+		if(strncmp("file=", argv[i], 5) == 0) {
+			strncpy(filename, argv[i] + 5, sizeof(filename) - 1);
+			filename[sizeof(filename) - 1] = '\0';
+			if(debug) {
+				openlog(MODULE_NAME, LOG_PID, LOG_AUTHPRIV);
+				syslog(LOG_DEBUG, "set filename to \"%s\"",
+				       filename);
+				closelog();
+			}
+		}
+	}
+
+	/* open the file */
+	fp = fopen(filename, "r");
+	if(fp == NULL) {
+		openlog(MODULE_NAME, LOG_PID, LOG_AUTHPRIV);
+		syslog(LOG_ERR, "error opening \"%s\": %s", filename,
+		       strerror(errno));
+		closelog();
+		return PAM_SYSTEM_ERR;
+	}
+
+	if(pam_get_item(pamh, PAM_USER, (const void**) &user) != PAM_SUCCESS) {
+		openlog(MODULE_NAME, LOG_PID, LOG_AUTHPRIV);
+		syslog(LOG_ERR, "user name not specified yet");
+		closelog();
+		fclose(fp);
+		return PAM_SYSTEM_ERR;
+	}
+
+	if ((user == NULL) || (strlen(user) == 0)) {
+		openlog(MODULE_NAME, LOG_PID, LOG_AUTHPRIV);
+		syslog(LOG_ERR, "user name not valid");
+		closelog();
+		fclose(fp);
+		return PAM_SYSTEM_ERR;
+	}
+
+	/* scan the file, using fgets() instead of fgetpwent() because i
+	 * don't want to mess with applications which call fgetpwent() */
+	ret = PAM_PERM_DENIED;
+	snprintf(name, sizeof(name), "%s:", user);
+	i = strlen(name);
+	while(fgets(line, sizeof(line), fp) != NULL) {
+		if(debug) {
+			openlog(MODULE_NAME, LOG_PID, LOG_AUTHPRIV);
+			syslog(LOG_DEBUG, "checking \"%s\"", line);
+			closelog();
+		}
+		if(strncmp(name, line, i) == 0) {
+			ret = PAM_SUCCESS;
+			break;
+		}
+	}
+
+	/* okay, we're done */	
+	fclose(fp);
+	return ret;
+}
+
+PAM_EXTERN
+int pam_sm_setcred(pam_handle_t *pamh, int flags, int argc, const char **argv)
+{
+	return PAM_SUCCESS;
+}
+
+PAM_EXTERN
+int pam_sm_acct_mgmt(pam_handle_t *pamh, int flags, int argc, const char **argv)
+{
+	return pam_sm_authenticate(pamh, flags, argc, argv);
+}
+
+#ifdef PAM_STATIC
+
+/* static module data */
+
+struct pam_module _pam_localuser_modstruct = {
+     "pam_localuser",
+     pam_sm_authenticate,
+     pam_sm_setcred,
+     pam_sm_acct_mgmt,
+     NULL,
+     NULL,
+     NULL,
+};
+
+#endif