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-rw-r--r--trunk/main/acl.c517
1 files changed, 517 insertions, 0 deletions
diff --git a/trunk/main/acl.c b/trunk/main/acl.c
new file mode 100644
index 000000000..4a26ec3ce
--- /dev/null
+++ b/trunk/main/acl.c
@@ -0,0 +1,517 @@
+/*
+ * Asterisk -- An open source telephony toolkit.
+ *
+ * Copyright (C) 1999 - 2006, Digium, Inc.
+ *
+ * Mark Spencer <markster@digium.com>
+ *
+ * See http://www.asterisk.org for more information about
+ * the Asterisk project. Please do not directly contact
+ * any of the maintainers of this project for assistance;
+ * the project provides a web site, mailing lists and IRC
+ * channels for your use.
+ *
+ * This program is free software, distributed under the terms of
+ * the GNU General Public License Version 2. See the LICENSE file
+ * at the top of the source tree.
+ */
+
+/*! \file
+ *
+ * \brief Various sorts of access control
+ *
+ * \author Mark Spencer <markster@digium.com>
+ */
+
+#include "asterisk.h"
+
+ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
+
+#include "asterisk/network.h"
+
+#if defined(__OpenBSD__) || defined(__NetBSD__) || defined(__FreeBSD__) || defined(__Darwin__)
+#include <fcntl.h>
+#include <net/route.h>
+#endif
+
+#if defined(SOLARIS)
+#include <sys/sockio.h>
+#include <net/if.h>
+#else
+#include <ifaddrs.h>
+#endif
+
+#include "asterisk/acl.h"
+#include "asterisk/channel.h"
+#include "asterisk/utils.h"
+#include "asterisk/lock.h"
+#include "asterisk/srv.h"
+
+static void score_address(const struct sockaddr_in *sin, struct in_addr *best_addr, int *best_score)
+{
+ const char *address;
+ int score;
+
+ address = ast_inet_ntoa(sin->sin_addr);
+
+ /* RFC 1700 alias for the local network */
+ if (address[0] == '0')
+ score = -25;
+ /* RFC 1700 localnet */
+ else if (strncmp(address, "127", 3) == 0)
+ score = -20;
+ /* RFC 1918 non-public address space */
+ else if (strncmp(address, "10.", 3) == 0)
+ score = -5;
+ /* RFC 1918 non-public address space */
+ else if (strncmp(address, "172", 3) == 0) {
+ /* 172.16.0.0 - 172.19.255.255, but not 172.160.0.0 - 172.169.255.255 */
+ if (address[4] == '1' && address[5] >= '6' && address[6] == '.')
+ score = -5;
+ /* 172.20.0.0 - 172.29.255.255, but not 172.200.0.0 - 172.255.255.255 nor 172.2.0.0 - 172.2.255.255 */
+ else if (address[4] == '2' && address[6] == '.')
+ score = -5;
+ /* 172.30.0.0 - 172.31.255.255 */
+ else if (address[4] == '3' && address[5] <= '1')
+ score = -5;
+ /* All other 172 addresses are public */
+ else
+ score = 0;
+ /* RFC 2544 Benchmark test range */
+ } else if (strncmp(address, "198.1", 5) == 0 && address[5] >= '8' && address[6] == '.')
+ score = -10;
+ /* RFC 1918 non-public address space */
+ else if (strncmp(address, "192.168", 7) == 0)
+ score = -5;
+ /* RFC 3330 Zeroconf network */
+ else if (strncmp(address, "169.254", 7) == 0)
+ /*!\note Better score than a test network, but not quite as good as RFC 1918
+ * address space. The reason is that some Linux distributions automatically
+ * configure a Zeroconf address before trying DHCP, so we want to prefer a
+ * DHCP lease to a Zeroconf address.
+ */
+ score = -10;
+ /* RFC 3330 Test network */
+ else if (strncmp(address, "192.0.2.", 8) == 0)
+ score = -15;
+ /* Every other address should be publically routable */
+ else
+ score = 0;
+
+ if (score > *best_score) {
+ *best_score = score;
+ memcpy(best_addr, &sin->sin_addr, sizeof(*best_addr));
+ }
+}
+
+static int get_local_address(struct in_addr *ourip)
+{
+ int s, res = -1;
+#ifdef SOLARIS
+ struct lifreq *ifr = NULL;
+ struct lifnum ifn;
+ struct lifconf ifc;
+ struct sockaddr_in *sa;
+ char *buf = NULL;
+ int bufsz, x;
+#endif /* SOLARIS */
+#if defined(__OpenBSD__) || defined(__NetBSD__) || defined(__FreeBSD__) || defined(__linux__) || defined(__Darwin__)
+ struct ifaddrs *ifap, *ifaphead;
+ int rtnerr;
+ const struct sockaddr_in *sin;
+#endif /* BSD_OR_LINUX */
+ struct in_addr best_addr;
+ int best_score = -100;
+ memset(&best_addr, 0, sizeof(best_addr));
+
+#if defined(__OpenBSD__) || defined(__NetBSD__) || defined(__FreeBSD__) || defined(__linux__) || defined(__Darwin__)
+ rtnerr = getifaddrs(&ifaphead);
+ if (rtnerr) {
+ perror(NULL);
+ return -1;
+ }
+#endif /* BSD_OR_LINUX */
+
+ s = socket(AF_INET, SOCK_STREAM, 0);
+
+ if (s > 0) {
+#if defined(__OpenBSD__) || defined(__NetBSD__) || defined(__FreeBSD__) || defined(__linux__) || defined(__Darwin__)
+ for (ifap = ifaphead; ifap; ifap = ifap->ifa_next) {
+
+ if (ifap->ifa_addr->sa_family == AF_INET) {
+ sin = (const struct sockaddr_in *) ifap->ifa_addr;
+ score_address(sin, &best_addr, &best_score);
+ res = 0;
+
+ if (best_score == 0)
+ break;
+ }
+ }
+#endif /* BSD_OR_LINUX */
+
+ /* There is no reason whatsoever that this shouldn't work on Linux or BSD also. */
+#ifdef SOLARIS
+ /* Get a count of interfaces on the machine */
+ ifn.lifn_family = AF_INET;
+ ifn.lifn_flags = 0;
+ ifn.lifn_count = 0;
+ if (ioctl(s, SIOCGLIFNUM, &ifn) < 0) {
+ close(s);
+ return -1;
+ }
+
+ bufsz = ifn.lifn_count * sizeof(struct lifreq);
+ if (!(buf = malloc(bufsz))) {
+ close(s);
+ return -1;
+ }
+ memset(buf, 0, bufsz);
+
+ /* Get a list of interfaces on the machine */
+ ifc.lifc_len = bufsz;
+ ifc.lifc_buf = buf;
+ ifc.lifc_family = AF_INET;
+ ifc.lifc_flags = 0;
+ if (ioctl(s, SIOCGLIFCONF, &ifc) < 0) {
+ close(s);
+ free(buf);
+ return -1;
+ }
+
+ for (ifr = (struct lifreq *)buf, x = 0; x < ifn.lifn_count; ifr++, x++) {
+ sa = (struct sockaddr_in *)&(ifr->lifr_addr);
+ score_address(sa, &best_addr, &best_score);
+ res = 0;
+
+ if (best_score == 0)
+ break;
+ }
+
+ free(buf);
+#endif /* SOLARIS */
+
+ close(s);
+ }
+#if defined(__OpenBSD__) || defined(__NetBSD__) || defined(__FreeBSD__) || defined(__linux__) || defined(__Darwin__)
+ freeifaddrs(ifaphead);
+#endif /* BSD_OR_LINUX */
+
+ if (res == 0 && ourip)
+ memcpy(ourip, &best_addr, sizeof(*ourip));
+ return res;
+}
+/* Free HA structure */
+void ast_free_ha(struct ast_ha *ha)
+{
+ struct ast_ha *hal;
+ while (ha) {
+ hal = ha;
+ ha = ha->next;
+ ast_free(hal);
+ }
+}
+
+/* Copy HA structure */
+static void ast_copy_ha(struct ast_ha *from, struct ast_ha *to)
+{
+ memcpy(&to->netaddr, &from->netaddr, sizeof(from->netaddr));
+ memcpy(&to->netmask, &from->netmask, sizeof(from->netmask));
+ to->sense = from->sense;
+}
+
+/* Create duplicate of ha structure */
+static struct ast_ha *ast_duplicate_ha(struct ast_ha *original)
+{
+ struct ast_ha *new_ha;
+
+ if ((new_ha = ast_malloc(sizeof(*new_ha)))) {
+ /* Copy from original to new object */
+ ast_copy_ha(original, new_ha);
+ }
+
+ return new_ha;
+}
+
+/* Create duplicate HA link list */
+/* Used in chan_sip2 templates */
+struct ast_ha *ast_duplicate_ha_list(struct ast_ha *original)
+{
+ struct ast_ha *start = original;
+ struct ast_ha *ret = NULL;
+ struct ast_ha *link, *prev = NULL;
+
+ while (start) {
+ link = ast_duplicate_ha(start); /* Create copy of this object */
+ if (prev)
+ prev->next = link; /* Link previous to this object */
+
+ if (!ret)
+ ret = link; /* Save starting point */
+
+ start = start->next; /* Go to next object */
+ prev = link; /* Save pointer to this object */
+ }
+ return ret; /* Return start of list */
+}
+
+struct ast_ha *ast_append_ha(const char *sense, const char *stuff, struct ast_ha *path, int *error)
+{
+ struct ast_ha *ha;
+ char *nm;
+ struct ast_ha *prev = NULL;
+ struct ast_ha *ret;
+ int x;
+ char *tmp = ast_strdupa(stuff);
+
+ ret = path;
+ while (path) {
+ prev = path;
+ path = path->next;
+ }
+
+ ha = ast_malloc(sizeof(*ha));
+ if (!ha)
+ return ret;
+
+ nm = strchr(tmp, '/');
+ if (!nm) {
+ /* assume /32. Yes, htonl does not do anything for this particular mask
+ but we better use it to show we remember about byte order */
+ ha->netmask.s_addr = htonl(0xFFFFFFFF);
+ } else {
+ *nm = '\0';
+ nm++;
+
+ if (!strchr(nm, '.')) {
+ if ((sscanf(nm, "%d", &x) == 1) && (x >= 0) && (x <= 32))
+ ha->netmask.s_addr = htonl(0xFFFFFFFF << (32 - x));
+ else {
+ ast_log(LOG_WARNING, "Invalid CIDR in %s\n", stuff);
+ ast_free(ha);
+ if (error)
+ *error = 1;
+ return ret;
+ }
+ } else if (!inet_aton(nm, &ha->netmask)) {
+ ast_log(LOG_WARNING, "Invalid mask in %s\n", stuff);
+ ast_free(ha);
+ if (error)
+ *error = 1;
+ return ret;
+ }
+ }
+
+ if (!inet_aton(tmp, &ha->netaddr)) {
+ ast_log(LOG_WARNING, "Invalid IP address in %s\n", stuff);
+ ast_free(ha);
+ if (error)
+ *error = 1;
+ return ret;
+ }
+
+ ha->netaddr.s_addr &= ha->netmask.s_addr;
+
+ ha->sense = strncasecmp(sense, "p", 1) ? AST_SENSE_DENY : AST_SENSE_ALLOW;
+
+ ha->next = NULL;
+ if (prev) {
+ prev->next = ha;
+ } else {
+ ret = ha;
+ }
+
+ ast_debug(1, "%s/%s sense %d appended to acl for peer\n", ast_strdupa(ast_inet_ntoa(ha->netaddr)), ast_strdupa(ast_inet_ntoa(ha->netmask)), ha->sense);
+
+ return ret;
+}
+
+int ast_apply_ha(struct ast_ha *ha, struct sockaddr_in *sin)
+{
+ /* Start optimistic */
+ int res = AST_SENSE_ALLOW;
+ while (ha) {
+#if 0 /* debugging code */
+ char iabuf[INET_ADDRSTRLEN];
+ char iabuf2[INET_ADDRSTRLEN];
+ /* DEBUG */
+ ast_copy_string(iabuf, ast_inet_ntoa(sin->sin_addr), sizeof(iabuf));
+ ast_copy_string(iabuf2, ast_inet_ntoa(ha->netaddr), sizeof(iabuf2));
+ ast_debug(1, "##### Testing %s with %s\n", iabuf, iabuf2);
+#endif
+ /* For each rule, if this address and the netmask = the net address
+ apply the current rule */
+ if ((sin->sin_addr.s_addr & ha->netmask.s_addr) == ha->netaddr.s_addr)
+ res = ha->sense;
+ ha = ha->next;
+ }
+ return res;
+}
+
+int ast_get_ip_or_srv(struct sockaddr_in *sin, const char *value, const char *service)
+{
+ struct hostent *hp;
+ struct ast_hostent ahp;
+ char srv[256];
+ char host[256];
+ int tportno = ntohs(sin->sin_port);
+ if (service) {
+ snprintf(srv, sizeof(srv), "%s.%s", service, value);
+ if (ast_get_srv(NULL, host, sizeof(host), &tportno, srv) > 0) {
+ sin->sin_port = htons(tportno);
+ value = host;
+ }
+ }
+ hp = ast_gethostbyname(value, &ahp);
+ if (hp) {
+ memcpy(&sin->sin_addr, hp->h_addr, sizeof(sin->sin_addr));
+ } else {
+ ast_log(LOG_WARNING, "Unable to lookup '%s'\n", value);
+ return -1;
+ }
+ return 0;
+}
+
+struct dscp_codepoint {
+ char *name;
+ unsigned int space;
+};
+
+/* IANA registered DSCP codepoints */
+
+static const struct dscp_codepoint dscp_pool1[] = {
+ { "CS0", 0x00 },
+ { "CS1", 0x08 },
+ { "CS2", 0x10 },
+ { "CS3", 0x18 },
+ { "CS4", 0x20 },
+ { "CS5", 0x28 },
+ { "CS6", 0x30 },
+ { "CS7", 0x38 },
+ { "AF11", 0x0A },
+ { "AF12", 0x0C },
+ { "AF13", 0x0E },
+ { "AF21", 0x12 },
+ { "AF22", 0x14 },
+ { "AF23", 0x16 },
+ { "AF31", 0x1A },
+ { "AF32", 0x1C },
+ { "AF33", 0x1E },
+ { "AF41", 0x22 },
+ { "AF42", 0x24 },
+ { "AF43", 0x26 },
+ { "EF", 0x2E },
+};
+
+int ast_str2cos(const char *value, unsigned int *cos)
+{
+ int fval;
+
+ if (sscanf(value, "%d", &fval) == 1) {
+ if (fval < 8) {
+ *cos = fval;
+ return 0;
+ }
+ }
+
+ return -1;
+}
+
+int ast_str2tos(const char *value, unsigned int *tos)
+{
+ int fval;
+ unsigned int x;
+
+ if (sscanf(value, "%i", &fval) == 1) {
+ *tos = fval & 0xFF;
+ return 0;
+ }
+
+ for (x = 0; x < sizeof(dscp_pool1) / sizeof(dscp_pool1[0]); x++) {
+ if (!strcasecmp(value, dscp_pool1[x].name)) {
+ *tos = dscp_pool1[x].space << 2;
+ return 0;
+ }
+ }
+
+ return -1;
+}
+
+const char *ast_tos2str(unsigned int tos)
+{
+ unsigned int x;
+
+ for (x = 0; x < sizeof(dscp_pool1) / sizeof(dscp_pool1[0]); x++) {
+ if (dscp_pool1[x].space == (tos >> 2))
+ return dscp_pool1[x].name;
+ }
+
+ return "unknown";
+}
+
+int ast_get_ip(struct sockaddr_in *sin, const char *value)
+{
+ return ast_get_ip_or_srv(sin, value, NULL);
+}
+
+int ast_ouraddrfor(struct in_addr *them, struct in_addr *us)
+{
+ int s;
+ struct sockaddr_in sin;
+ socklen_t slen;
+
+ s = socket(PF_INET, SOCK_DGRAM, 0);
+ if (s < 0) {
+ ast_log(LOG_ERROR, "Cannot create socket\n");
+ return -1;
+ }
+ sin.sin_family = AF_INET;
+ sin.sin_port = 5060;
+ sin.sin_addr = *them;
+ if (connect(s, (struct sockaddr *)&sin, sizeof(sin))) {
+ ast_log(LOG_WARNING, "Cannot connect\n");
+ close(s);
+ return -1;
+ }
+ slen = sizeof(sin);
+ if (getsockname(s, (struct sockaddr *)&sin, &slen)) {
+ ast_log(LOG_WARNING, "Cannot get socket name\n");
+ close(s);
+ return -1;
+ }
+ close(s);
+ ast_debug(3, "Found IP address for this socket\n");
+ *us = sin.sin_addr;
+ return 0;
+}
+
+int ast_find_ourip(struct in_addr *ourip, struct sockaddr_in bindaddr)
+{
+ char ourhost[MAXHOSTNAMELEN] = "";
+ struct ast_hostent ahp;
+ struct hostent *hp;
+ struct in_addr saddr;
+
+ /* just use the bind address if it is nonzero */
+ if (ntohl(bindaddr.sin_addr.s_addr)) {
+ memcpy(ourip, &bindaddr.sin_addr, sizeof(*ourip));
+ ast_debug(3, "Attached to given IP address\n");
+ return 0;
+ }
+ /* try to use our hostname */
+ if (gethostname(ourhost, sizeof(ourhost) - 1)) {
+ ast_log(LOG_WARNING, "Unable to get hostname\n");
+ } else {
+ hp = ast_gethostbyname(ourhost, &ahp);
+ if (hp) {
+ memcpy(ourip, hp->h_addr, sizeof(*ourip));
+ ast_debug(3, "Found one IP address based on local hostname %s.\n", ourhost);
+ return 0;
+ }
+ }
+ ast_debug(3, "Trying to check A.ROOT-SERVERS.NET and get our IP address for that connection\n");
+ /* A.ROOT-SERVERS.NET. */
+ if (inet_aton("198.41.0.4", &saddr) && !ast_ouraddrfor(&saddr, ourip))
+ return 0;
+ return get_local_address(ourip);
+}
+
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