another batch of simplifications to authenticate()

(they are committed a bit at a time so it is easier to
revert them in case we find a bug at a later time).



git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@45529 65c4cc65-6c06-0410-ace0-fbb531ad65f3

main/manager.c

@@ -852,22 +852,23 @@ static int set_eventmask(struct mansession *s, char *eventmask)
 static int authenticate(struct mansession *s, struct message *m)
 {
 	char *user = astman_get_header(m, "Username");
-	char *pass = astman_get_header(m, "Secret");
-	char *authtype = astman_get_header(m, "AuthType");
-	char *key = astman_get_header(m, "Key");
-	char *events = astman_get_header(m, "Events");
-	char *cat = NULL;
-	struct ast_config *cfg = ast_config_load("manager.conf");
-	int ret = -1;	/* default: error return */
-	struct ast_variable *v;
+	int error = -1;
 	struct ast_ha *ha = NULL;
 	char *password = NULL;
+	int readperm = 0, writeperm = 0;
 
+	if (ast_strlen_zero(user))	/* missing username */
+		return -1;
+
+    {
 	/*
-	 * XXX there is no need to scan the config file again here,
+	 * XXX there should be no need to scan the config file again here,
 	 * suffices to call ast_get_manager_by_name_locked() to fetch
 	 * the user's entry.
 	 */
+	struct ast_config *cfg = ast_config_load("manager.conf");
+	char *cat = NULL;
+	struct ast_variable *v;
 
 	if (!cfg)
 		return -1;
@@ -879,68 +880,72 @@ static int authenticate(struct mansession *s, struct message *m)
 	if (!cat) {
 		ast_log(LOG_NOTICE, "%s tried to authenticate with nonexistent user '%s'\n", ast_inet_ntoa(s->sin.sin_addr), user);
 		ast_config_destroy(cfg);
-		return ret;
+		return -1;
 	}
 
-		/* collect parameters for the user's entry */
-		for (v = ast_variable_browse(cfg, cat); v; v = v->next) {
-			if (!strcasecmp(v->name, "secret")) {
-				password = v->value;
-			} else if (!strcasecmp(v->name, "permit") ||
-				   !strcasecmp(v->name, "deny")) {
-				ha = ast_append_ha(v->name, v->value, ha);
-			} else if (!strcasecmp(v->name, "writetimeout")) {
-				int val = atoi(v->value);
-
-				if (val < 100)
-					ast_log(LOG_WARNING, "Invalid writetimeout value '%s' at line %d\n", v->value, v->lineno);
-				else
-					s->writetimeout = val;
-			}
-				
+	/* collect parameters for the user's entry */
+	for (v = ast_variable_browse(cfg, cat); v; v = v->next) {
+		if (!strcasecmp(v->name, "secret"))
+			password = ast_strdupa(v->value);
+		else if (!strcasecmp(v->name, "read"))
+			readperm = get_perm(v->value);
+		else if (!strcasecmp(v->name, "write"))
+			writeperm = get_perm(v->value);
+		else if (!strcasecmp(v->name, "permit") ||
+			   !strcasecmp(v->name, "deny")) {
+			ha = ast_append_ha(v->name, v->value, ha);
+		} else if (!strcasecmp(v->name, "writetimeout")) {
+			int val = atoi(v->value);
+
+			if (val < 100)
+				ast_log(LOG_WARNING, "Invalid writetimeout value '%s' at line %d\n", v->value, v->lineno);
+			else
+				s->writetimeout = val;
 		}
-		if (ha) {
-			if (!ast_apply_ha(ha, &(s->sin))) {
-				ast_log(LOG_NOTICE, "%s failed to pass IP ACL as '%s'\n", ast_inet_ntoa(s->sin.sin_addr), user);
-				ast_free_ha(ha);
-				goto error;
-			}
-			ast_free_ha(ha);
+	}
+	ast_config_destroy(cfg);
+    }
+
+	if (ha) {
+		int good = ast_apply_ha(ha, &(s->sin));
+		ast_free_ha(ha);
+		if (!good) {
+			ast_log(LOG_NOTICE, "%s failed to pass IP ACL as '%s'\n", ast_inet_ntoa(s->sin.sin_addr), user);
+			return -1;
 		}
-		if (!strcasecmp(authtype, "MD5")) {
-			if (!ast_strlen_zero(key) && s->challenge) {
-				int x;
-				int len = 0;
-				char md5key[256] = "";
-				struct MD5Context md5;
-				unsigned char digest[16];
-				MD5Init(&md5);
-				MD5Update(&md5, (unsigned char *) s->challenge, strlen(s->challenge));
-				MD5Update(&md5, (unsigned char *) password, strlen(password));
-				MD5Final(digest, &md5);
-				for (x=0; x<16; x++)
-					len += sprintf(md5key + len, "%2.2x", digest[x]);
-				if (!strcmp(md5key, key))
-					goto ok;
-			}
-		} else if (password) {
-			if (!strcmp(password, pass))
-				goto ok;
+	}
+	if (!strcasecmp(astman_get_header(m, "AuthType"), "MD5")) {
+		char *key = astman_get_header(m, "Key");
+		if (!ast_strlen_zero(key) && !ast_strlen_zero(s->challenge)) {
+			int x;
+			int len = 0;
+			char md5key[256] = "";
+			struct MD5Context md5;
+			unsigned char digest[16];
+
+			MD5Init(&md5);
+			MD5Update(&md5, (unsigned char *) s->challenge, strlen(s->challenge));
+			MD5Update(&md5, (unsigned char *) password, strlen(password));
+			MD5Final(digest, &md5);
+			for (x=0; x<16; x++)
+				len += sprintf(md5key + len, "%2.2x", digest[x]);
+			if (!strcmp(md5key, key))
+				error = 0;
 		}
+	} else if (password) {
+		char *pass = astman_get_header(m, "Secret");
+		if (!strcmp(password, pass))
+			error = 0;
+	}
+	if (error) {
 		ast_log(LOG_NOTICE, "%s failed to authenticate as '%s'\n", ast_inet_ntoa(s->sin.sin_addr), user);
-		goto error;
-
-ok:
-		ast_copy_string(s->username, cat, sizeof(s->username));
-		s->readperm = get_perm(ast_variable_retrieve(cfg, cat, "read"));
-		s->writeperm = get_perm(ast_variable_retrieve(cfg, cat, "write"));
-		if (events)
-			set_eventmask(s, events);
-		ret = 0;
-
-error:
-	ast_config_destroy(cfg);
-	return ret;
+		return -1;
+	}
+	ast_copy_string(s->username, user, sizeof(s->username));
+	s->readperm = readperm;
+	s->writeperm = writeperm;
+	set_eventmask(s, astman_get_header(m, "Events"));
+	return 0;
 }
 
 /*! \brief Manager PING */