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-rw-r--r--source3/lib/util_sock.c167
1 files changed, 112 insertions, 55 deletions
diff --git a/source3/lib/util_sock.c b/source3/lib/util_sock.c
index 5a96bb79d6..8c5d1b6fec 100644
--- a/source3/lib/util_sock.c
+++ b/source3/lib/util_sock.c
@@ -1547,40 +1547,101 @@ int open_udp_socket(const char *host, int port)
}
/*******************************************************************
+ Return the IP addr of the remote end of a socket as a string.
+ Optionally return the struct sockaddr_storage.
+ ******************************************************************/
+
+static const char *get_peer_addr_internal(int fd,
+ struct sockaddr_storage *pss,
+ socklen_t *plength)
+{
+ struct sockaddr_storage ss;
+ socklen_t length = sizeof(ss);
+ static char addr_buf[INET6_ADDRSTRLEN];
+
+ safe_strcpy(addr_buf,"0.0.0.0",sizeof(addr_buf)-1);
+
+ if (fd == -1) {
+ return addr_buf;
+ }
+
+ if (pss == NULL) {
+ pss = &ss;
+ }
+ if (plength == NULL) {
+ plength = &length;
+ }
+
+ if (getpeername(fd, (struct sockaddr *)pss, plength) < 0) {
+ DEBUG(0,("getpeername failed. Error was %s\n",
+ strerror(errno) ));
+ return addr_buf;
+ }
+
+ print_sockaddr(addr_buf,
+ sizeof(addr_buf),
+ pss,
+ *plength);
+ return addr_buf;
+}
+
+
+/*******************************************************************
Matchname - determine if host name matches IP address. Used to
confirm a hostname lookup to prevent spoof attacks.
******************************************************************/
-static bool matchname(char *remotehost,struct in_addr addr)
+static bool matchname(const char *remotehost,
+ const struct sockaddr_storage *pss,
+ socklen_t len)
{
- struct hostent *hp;
- int i;
+ struct addrinfo hints;
+ struct addrinfo *res = NULL;
+ struct addrinfo *ailist = NULL;
+ char addr_buf[INET6_ADDRSTRLEN];
+ int ret = -1;
+
+ memset(&hints,'\0',sizeof(struct addrinfo));
+ /* By default make sure it supports TCP. */
+ hints.ai_socktype = SOCK_STREAM;
+ hints.ai_flags = AI_ADDRCONFIG|AI_CANONNAME;
- if ((hp = sys_gethostbyname(remotehost)) == 0) {
- DEBUG(0,("sys_gethostbyname(%s): lookup failure.\n",
- remotehost));
+ ret = getaddrinfo(remotehost, NULL,
+ &hints,
+ &res);
+
+ if (ret || res == NULL) {
+ DEBUG(3,("matchname: getaddrinfo failed for "
+ "name %s [%s]\n",
+ remotehost,
+ gai_strerror(ret) ));
return false;
}
/*
- * Make sure that gethostbyname() returns the "correct" host name.
- * Unfortunately, gethostbyname("localhost") sometimes yields
- * "localhost.domain". Since the latter host name comes from the
- * local DNS, we just have to trust it (all bets are off if the local
- * DNS is perverted). We always check the address list, though.
+ * Make sure that getaddrinfo() returns the "correct" host name.
*/
- if (!strequal(remotehost, hp->h_name)
- && !strequal(remotehost, "localhost")) {
- DEBUG(0,("host name/name mismatch: %s != %s\n",
- remotehost, hp->h_name));
+ if (res->ai_canonname == NULL ||
+ (!strequal(remotehost, res->ai_canonname) &&
+ !strequal(remotehost, "localhost"))) {
+ DEBUG(0,("matchname: host name/name mismatch: %s != %s\n",
+ remotehost,
+ res->ai_canonname ? res->ai_canonname : "(NULL)"));
+ freeaddrinfo(res);
return false;
}
/* Look up the host address in the address list we just got. */
- for (i = 0; hp->h_addr_list[i]; i++) {
- if (memcmp(hp->h_addr_list[i], (char *)&addr,sizeof(addr)) == 0)
+ for (ailist = res; ailist; ailist = ailist->ai_next) {
+ if (!ailist->ai_addr) {
+ continue;
+ }
+ if (addr_equal((const struct sockaddr_storage *)ailist->ai_addr,
+ pss)) {
+ freeaddrinfo(res);
return true;
+ }
}
/*
@@ -1589,8 +1650,14 @@ static bool matchname(char *remotehost,struct in_addr addr)
* it, but that could be dangerous, too.
*/
- DEBUG(0,("host name/address mismatch: %s != %s\n",
- inet_ntoa(addr), hp->h_name));
+ DEBUG(0,("matchname: host name/address mismatch: %s != %s\n",
+ print_sockaddr(addr_buf,
+ sizeof(addr_buf),
+ pss,
+ len),
+ res->ai_canonname ? res->ai_canonname : "(NULL)"));
+
+ freeaddrinfo(res);
return false;
}
@@ -1600,12 +1667,13 @@ static bool matchname(char *remotehost,struct in_addr addr)
const char *get_peer_name(int fd, bool force_lookup)
{
- static pstring name_buf;
- pstring tmp_name;
static fstring addr_buf;
- struct hostent *hp;
- struct in_addr addr;
+ static pstring name_buf;
+ struct sockaddr_storage ss;
+ socklen_t length = sizeof(ss);
const char *p;
+ int ret;
+ pstring tmp_name;
/* reverse lookups can be *very* expensive, and in many
situations won't work because many networks don't link dhcp
@@ -1615,28 +1683,37 @@ const char *get_peer_name(int fd, bool force_lookup)
return get_peer_addr(fd);
}
- p = get_peer_addr(fd);
+ p = get_peer_addr_internal(fd, &ss, &length);
/* it might be the same as the last one - save some DNS work */
- if (strcmp(p, addr_buf) == 0)
+ if (strcmp(p, addr_buf) == 0) {
return name_buf;
+ }
pstrcpy(name_buf,"UNKNOWN");
- if (fd == -1)
+ if (fd == -1) {
return name_buf;
+ }
fstrcpy(addr_buf, p);
- addr = *interpret_addr2(p);
-
/* Look up the remote host name. */
- if ((hp = gethostbyaddr((char *)&addr.s_addr,
- sizeof(addr.s_addr), AF_INET)) == 0) {
- DEBUG(1,("Gethostbyaddr failed for %s\n",p));
+ ret = getnameinfo((struct sockaddr *)&ss,
+ length,
+ name_buf,
+ sizeof(name_buf),
+ NULL,
+ 0,
+ NI_NUMERICHOST);
+
+ if (ret) {
+ DEBUG(1,("get_peer_name: getnameinfo failed "
+ "for %s with error %s\n",
+ p,
+ gai_strerror(ret)));
pstrcpy(name_buf, p);
} else {
- pstrcpy(name_buf,(char *)hp->h_name);
- if (!matchname(name_buf, addr)) {
+ if (!matchname(name_buf, &ss, length)) {
DEBUG(0,("Matchname failed on %s %s\n",name_buf,p));
pstrcpy(name_buf,"UNKNOWN");
}
@@ -1646,7 +1723,7 @@ const char *get_peer_name(int fd, bool force_lookup)
use --enable-developer or the clobber_region() call will
get you */
- pstrcpy( tmp_name, name_buf );
+ pstrcpy(tmp_name, name_buf );
alpha_strcpy(name_buf, tmp_name, "_-.", sizeof(name_buf));
if (strstr(name_buf,"..")) {
pstrcpy(name_buf, "UNKNOWN");
@@ -1661,27 +1738,7 @@ const char *get_peer_name(int fd, bool force_lookup)
const char *get_peer_addr(int fd)
{
- struct sockaddr_storage ss;
- socklen_t length = sizeof(ss);
- static char addr_buf[INET6_ADDRSTRLEN];
-
- safe_strcpy(addr_buf,"0.0.0.0",sizeof(addr_buf)-1);
-
- if (fd == -1) {
- return addr_buf;
- }
-
- if (getpeername(fd, (struct sockaddr *)&ss, &length) < 0) {
- DEBUG(0,("getpeername failed. Error was %s\n",
- strerror(errno) ));
- return addr_buf;
- }
-
- print_sockaddr(addr_buf,
- sizeof(addr_buf),
- &ss,
- length);
- return addr_buf;
+ return get_peer_addr_internal(fd, NULL, NULL);
}
/*******************************************************************
generated by cgit (git 2.34.1) at 2024-11-15 09:18:30 +0000