1 files changed, 128 insertions, 0 deletions
diff --git a/libpam/pam_modutil_searchkey.c b/libpam/pam_modutil_searchkey.c
new file mode 100644
index 00000000..ba023e52
--- /dev/null
+++ b/libpam/pam_modutil_searchkey.c
@@ -0,0 +1,128 @@
+/*
+ * This file implements the following functions:
+ *   pam_modutil_search_key:
+ *     lookup a value for key in login.defs file or similar key value format
+ */
+
+#include "config.h"
+
+#include "pam_private.h"
+#include "pam_modutil_private.h"
+#include <security/pam_ext.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <ctype.h>
+#ifdef USE_ECONF
+#include <libeconf.h>
+#endif
+
+#define BUF_SIZE 8192
+
+#ifdef USE_ECONF
+#define LOGIN_DEFS "/etc/login.defs"
+
+#ifndef VENDORDIR
+#define VENDORDIR NULL
+#endif
+
+static char *
+econf_search_key (const char *name, const char *suffix, const char *key)
+{
+	econf_file *key_file = NULL;
+	char *val;
+
+	if (econf_readDirs (&key_file, VENDORDIR, SYSCONFDIR, name, suffix,
+			    " \t", "#"))
+		return NULL;
+
+	if (econf_getStringValue (key_file, NULL, key, &val)) {
+		econf_free (key_file);
+		return NULL;
+	}
+
+	econf_free (key_file);
+
+	return val;
+}
+
+#endif
+
+/* lookup a value for key in login.defs file or similar key value format */
+char *
+pam_modutil_search_key(pam_handle_t *pamh UNUSED,
+		       const char *file_name,
+		       const char *key)
+{
+	FILE *fp;
+	char *buf = NULL;
+	size_t buflen = 0;
+	char *retval = NULL;
+
+#ifdef USE_ECONF
+	if (strcmp (file_name, LOGIN_DEFS) == 0)
+		return econf_search_key ("login", ".defs", key);
+#endif
+
+	fp = fopen(file_name, "r");
+	if (NULL == fp)
+		return NULL;
+
+	while (!feof(fp)) {
+		char *tmp, *cp;
+#if defined(HAVE_GETLINE)
+		ssize_t n = getline(&buf, &buflen, fp);
+#elif defined (HAVE_GETDELIM)
+		ssize_t n = getdelim(&buf, &buflen, '\n', fp);
+#else
+		ssize_t n;
+
+		if (buf == NULL) {
+			buflen = BUF_SIZE;
+			buf = malloc(buflen);
+			if (buf == NULL) {
+				fclose(fp);
+				return NULL;
+			}
+		}
+		buf[0] = '\0';
+		if (fgets(buf, buflen - 1, fp) == NULL)
+			break;
+		else if (buf != NULL)
+			n = strlen(buf);
+		else
+			n = 0;
+#endif /* HAVE_GETLINE / HAVE_GETDELIM */
+		cp = buf;
+
+		if (n < 1)
+			break;
+		if (cp[n - 1] == '\n')
+			cp[n - 1] = '\0';
+
+		tmp = strchr(cp, '#');  /* remove comments */
+		if (tmp)
+			*tmp = '\0';
+		while (isspace((int)*cp))    /* remove spaces and tabs */
+			++cp;
+		if (*cp == '\0')        /* ignore empty lines */
+			continue;
+
+		tmp = strsep (&cp, " \t=");
+		if (cp != NULL)
+			while (isspace((int)*cp) || *cp == '=')
+				++cp;
+		else
+			cp = buf + n;   /* empty string */
+
+		if (strcasecmp(tmp, key) == 0) {
+			retval = strdup(cp);
+			break;
+		}
+	}
+	fclose(fp);
+
+	free(buf);
+
+	return retval;
+}