MFV (r277045): merge upstream version of the local socket patch.

contrib/unbound/config.h

@@ -351,6 +351,9 @@
 /* Define to 1 if `ipi_spec_dst' is a member of `struct in_pktinfo'. */
 /* #undef HAVE_STRUCT_IN_PKTINFO_IPI_SPEC_DST */
 
+/* Define to 1 if `sun_len' is a member of `struct sockaddr_un'. */
+#define HAVE_STRUCT_SOCKADDR_UN_SUN_LEN 1
+
 /* Define if you have Swig libraries and header files. */
 /* #undef HAVE_SWIG */
 

contrib/unbound/config.h.in

@@ -350,6 +350,9 @@
 /* Define to 1 if `ipi_spec_dst' is a member of `struct in_pktinfo'. */
 #undef HAVE_STRUCT_IN_PKTINFO_IPI_SPEC_DST
 
+/* Define to 1 if `sun_len' is a member of `struct sockaddr_un'. */
+#undef HAVE_STRUCT_SOCKADDR_UN_SUN_LEN
+
 /* Define if you have Swig libraries and header files. */
 #undef HAVE_SWIG
 

contrib/unbound/configure.ac

@@ -938,6 +938,12 @@ if test $ac_cv_func_daemon = yes; then
 ])
 fi
 
+AC_CHECK_MEMBERS([struct sockaddr_un.sun_len],,,[
+AC_INCLUDES_DEFAULT
+#ifdef HAVE_SYS_UN_H
+#include <sys/un.h>
+#endif
+])
 AC_CHECK_MEMBERS([struct in_pktinfo.ipi_spec_dst],,,[
 AC_INCLUDES_DEFAULT
 #if HAVE_SYS_PARAM_H

contrib/unbound/daemon/remote.c

@@ -142,6 +142,7 @@ timeval_divide(struct timeval* avg, const struct timeval* sum, size_t d)
  * The following function was generated using the openssl utility, using
  * the command : "openssl dhparam -dsaparam -C 512"
  */
+#ifndef S_SPLINT_S
 DH *get_dh512()
 {
 	static unsigned char dh512_p[]={
@@ -170,6 +171,7 @@ DH *get_dh512()
 	dh->length = 160;
 	return(dh);
 }
+#endif /* SPLINT */
 
 struct daemon_remote*
 daemon_remote_create(struct config_file* cfg)
@@ -299,6 +301,7 @@ void daemon_remote_delete(struct daemon_remote* rc)
  * @param nr: port nr
  * @param list: list head
  * @param noproto_is_err: if lack of protocol support is an error.
+ * @param cfg: config with username for chown of unix-sockets.
  * @return false on failure.
  */
 static int
@@ -326,7 +329,7 @@ add_open(const char* ip, int nr, struct listen_port** list, int noproto_is_err,
 		if(fd != -1) {
 			if (cfg->username && cfg->username[0])
 				chown(ip, cfg->uid, cfg->gid);
-			chmod(ip, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
+			chmod(ip, (mode_t)(S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP));
 		}
 	} else {
 		hints.ai_socktype = SOCK_STREAM;

contrib/unbound/daemon/unbound.c

@@ -441,8 +441,6 @@ static void
 perform_setup(struct daemon* daemon, struct config_file* cfg, int debug_mode,
 	const char** cfgfile)
 {
-	log_assert(cfg);
-
 #ifdef HAVE_GETPWNAM
 	struct passwd *pwd = NULL;
 
@@ -653,6 +651,7 @@ run_daemon(const char* cfgfile, int cmdline_verbose, int debug_mode)
 			log_warn("Continuing with default config settings");
 		}
 		apply_settings(daemon, cfg, cmdline_verbose, debug_mode);
+		config_lookup_uid(cfg);
 	
 		/* prepare */
 		if(!daemon_open_shared_ports(daemon))

contrib/unbound/doc/Changelog

@@ -1,6 +1,11 @@
 8 December 2014: Wouter
 	- Fix CVE-2014-8602: denial of service by making resolver chase
 	  endless series of delegations.
+	- patch for remote control over local sockets, from Dag-Erling
+	  Smorgrav, Ilya Bakulin.  Use control-interface: /path/sock and
+	  control-use-cert: no.
+	- Fixup that patch and uid lookup (only for daemon).
+	- coded the default of control-use-cert, to yes.
 
 1 December 2014: Wouter
 	- Fix bug#632: unbound fails to build on AArch64, protects

contrib/unbound/doc/unbound.conf.5

@@ -976,7 +976,7 @@ default is 8953.
 If you change this and permissions have been dropped, you must restart
 the server for the change to take effect.
 .TP 5
-.B control-use-cert: \fI<yes or no>
+.B control\-use\-cert: \fI<yes or no>
 Whether to require certificate authentication of control connections.
 The default is "yes".
 This should not be changed unless there are other mechanisms in place

contrib/unbound/doc/unbound.conf.5.in

@@ -976,7 +976,7 @@ default is 8953.
 If you change this and permissions have been dropped, you must restart
 the server for the change to take effect.
 .TP 5
-.B control-use-cert: \fI<yes or no>
+.B control\-use\-cert: \fI<yes or no>
 Whether to require certificate authentication of control connections.
 The default is "yes".
 This should not be changed unless there are other mechanisms in place

contrib/unbound/services/listen_dnsport.c

@@ -576,15 +576,19 @@ create_tcp_accept_sock(struct addrinfo *addr, int v6only, int* noproto,
 }
 
 int
-create_local_accept_sock(char *path, int* noproto)
+create_local_accept_sock(const char *path, int* noproto)
 {
 #ifdef HAVE_SYS_UN_H
 	int s;
 	struct sockaddr_un sun;
 
-	sun.sun_len = sizeof(sun);
+#ifdef HAVE_STRUCT_SOCKADDR_UN_SUN_LEN
+	/* this member exists on BSDs, not Linux */
+	sun.sun_len = (sa_family_t)sizeof(sun);
+#endif
 	sun.sun_family = AF_LOCAL;
-	strlcpy(sun.sun_path, path, 104);
+	/* length is 92-108, 104 on FreeBSD */
+	(void)strlcpy(sun.sun_path, path, sizeof(sun.sun_path));
 
 	if ((s = socket(PF_LOCAL, SOCK_STREAM, 0)) == -1) {
 		log_err("Cannot create local socket %s (%s)",
@@ -600,7 +604,7 @@ create_local_accept_sock(char *path, int* noproto)
 	}
 
 	if (bind(s, (struct sockaddr *)&sun,
-		sizeof(struct sockaddr_un)) == -1) {
+		(socklen_t)sizeof(struct sockaddr_un)) == -1) {
 		log_err("Cannot bind local socket %s (%s)",
 			path, strerror(errno));
 		return -1;
@@ -616,6 +620,7 @@ create_local_accept_sock(char *path, int* noproto)
 		return -1;
 	}
 
+	(void)noproto; /*unused*/
 	return s;
 #else
 	log_err("Local sockets are not supported");

contrib/unbound/services/listen_dnsport.h

@@ -214,6 +214,6 @@ int create_tcp_accept_sock(struct addrinfo *addr, int v6only, int* noproto,
  *	are not supported.
  * @return: the socket. -1 on error.
  */
-int create_local_accept_sock(char* path, int* noproto);
+int create_local_accept_sock(const char* path, int* noproto);
 
 #endif /* LISTEN_DNSPORT_H */

contrib/unbound/smallapp/unbound-control.c

@@ -140,7 +140,7 @@ static void ssl_err(const char* s)
 static SSL_CTX*
 setup_ctx(struct config_file* cfg)
 {
-	char* s_cert, *c_key, *c_cert;
+	char* s_cert=NULL, *c_key=NULL, *c_cert=NULL;
 	SSL_CTX* ctx;
 
 	if(cfg->remote_control_use_cert) {
@@ -206,9 +206,11 @@ contact_server(const char* svr, struct config_file* cfg, int statuscmd)
 	} else if(svr[0] == '/') {
 		struct sockaddr_un* sun = (struct sockaddr_un *) &addr;
 		sun->sun_family = AF_LOCAL;
-		sun->sun_len = sizeof(sun);
-		strlcpy(sun->sun_path, svr, 104);
-		addrlen = sizeof(struct sockaddr_un);
+#ifdef HAVE_STRUCT_SOCKADDR_UN_SUN_LEN
+		sun->sun_len = (sa_family_t)sizeof(sun);
+#endif
+		(void)strlcpy(sun->sun_path, svr, sizeof(sun->sun_path));
+		addrlen = (socklen_t)sizeof(struct sockaddr_un);
 		addrfamily = AF_LOCAL;
 #endif
 	} else {

contrib/unbound/util/config_file.c

@@ -201,6 +201,7 @@ config_create(void)
 	cfg->remote_control_enable = 0;
 	cfg->control_ifs = NULL;
 	cfg->control_port = UNBOUND_CONTROL_PORT;
+	cfg->remote_control_use_cert = 1;
 	cfg->minimal_responses = 0;
 	cfg->rrset_roundrobin = 0;
 	cfg->max_udp_size = 4096;
@@ -805,16 +806,6 @@ config_read(struct config_file* cfg, const char* filename, const char* chroot)
 		return 0;
 	}
 
-#ifdef HAVE_GETPWNAM
-	/* translate username into uid and gid */
-	if(cfg->username && cfg->username[0]) {
-		struct passwd *pwd;
-		if((pwd = getpwnam(cfg->username)) == NULL)
-			log_err("user '%s' does not exist.", cfg->username);
-		cfg->uid = pwd->pw_uid;
-		cfg->gid = pwd->pw_gid;
-	}
-#endif
 	return 1;
 }
 
@@ -1203,6 +1194,20 @@ config_apply(struct config_file* config)
 	log_set_time_asc(config->log_time_ascii);
 }
 
+void config_lookup_uid(struct config_file* cfg)
+{
+#ifdef HAVE_GETPWNAM
+	/* translate username into uid and gid */
+	if(cfg->username && cfg->username[0]) {
+		struct passwd *pwd;
+		if((pwd = getpwnam(cfg->username)) == NULL)
+			log_err("user '%s' does not exist.", cfg->username);
+		cfg->uid = pwd->pw_uid;
+		cfg->gid = pwd->pw_gid;
+	}
+#endif
+}
+
 /** 
  * Calculate string length of full pathname in original filesys
  * @param fname: the path name to convert.

contrib/unbound/util/config_file.h

@@ -426,6 +426,12 @@ void config_delete(struct config_file* config);
  */
 void config_apply(struct config_file* config);
 
+/**
+ * Find username, sets uid and gid.
+ * @param config: the config structure.
+ */
+void config_lookup_uid(struct config_file* config);
+
 /**
  * Set the given keyword to the given value.
  * @param config: where to store config