This patch add seusers support to SELinux

[Daniel J Walsh <dwalsh@redhat.com>]

[-- Attachment #1: Type: text/plain, Size: 332 bytes --]

The idea here is to break the seusers file up into lots of little 
seusers file that can be user specific, also adds the service field to 
be used by tools like pam_selinux to choose which is the correct context 
to log a user in as.

Patch was added to facilitate IPA handing out SELinux content for 
selection of roles at login.


[-- Attachment #2: libselinux_seusers.patch --]
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--- nsalibselinux/include/selinux/selinux.h	2009-04-08 09:06:23.000000000 -0400
+++ libselinux-2.0.81/include/selinux/selinux.h	2009-05-18 14:04:07.000000000 -0400
@@ -544,6 +547,14 @@
    Caller must free the returned strings via free. */
 extern int getseuserbyname(const char *linuxuser, char **seuser, char **level);
 
+/* Get the SELinux username and level to use for a given Linux username and service. 
+   These values may then be passed into the get_ordered_context_list*
+   and get_default_context* functions to obtain a context for the user.
+   Returns 0 on success or -1 otherwise.
+   Caller must free the returned strings via free. */
+extern int getseuser(const char *username, const char *service, 
+		     char **r_seuser, char **r_level);
+
 /* Compare two file contexts, return 0 if equivalent. */
 int selinux_file_context_cmp(const security_context_t a,
 			     const security_context_t b);
--- nsalibselinux/src/seusers.c	2009-03-06 14:41:45.000000000 -0500
+++ libselinux-2.0.81/src/seusers.c	2009-05-18 14:04:07.000000000 -0400
@@ -243,3 +243,67 @@
 	*r_level = NULL;
 	return 0;
 }
+
+int getseuser(const char *username, const char *service, 
+	      char **r_seuser, char **r_level) {
+	int ret = -1;
+	int len = 0;
+	char *seuser = NULL;
+	char *level = NULL;
+	char *buffer = NULL;
+	size_t size = 0;
+	size_t lineno = 0;
+	char *rec = NULL;
+	char *path=NULL;
+	if (asprintf(&path,"%s/logins/%s", selinux_policy_root(), username) <  0)
+		goto err;
+	FILE *fp = fopen(path, "r");
+	free(path);
+	if (fp == NULL) goto err;
+	__fsetlocking(fp, FSETLOCKING_BYCALLER);
+	while (getline(&buffer, &size, fp) > 0) {
+		++lineno;
+
+		if (strncmp(buffer, "*:", 2) == 0) {
+			free(rec);
+			rec = strdup(buffer);
+			continue;
+		}
+		len = strlen(service);
+		if ((strncmp(buffer, service, len) == 0) &&
+		    (buffer[len] == ':')) {
+			free(rec);
+			rec = strdup(buffer);
+			break;
+		}
+	}
+
+	if (! rec)  goto err;
+	seuser = strchr(rec, ':');
+	if (! seuser) goto err;
+
+	seuser++;
+	level = strchr(seuser, ':');
+	*level = 0;
+	level++;
+	*r_seuser = strdup(seuser);
+	if (! *r_seuser) goto err;
+
+	len = strlen(level);
+	if (len && level[len-1] == '\n')
+		level[len-1] = 0;
+
+	*r_level = strdup(level);
+	if (! *r_level) {
+		free(*r_seuser);
+		goto err;
+	}
+	ret = 0;
+
+	err:
+	free(buffer);
+	if (fp) fclose(fp);
+	free(rec);
+
+	return (ret ? getseuserbyname(username, r_seuser, r_level) : ret);
+}