[asterisk-commits] trunk r8919 - /trunk/channels/chan_sip.c
asterisk-commits at lists.digium.com
asterisk-commits at lists.digium.com
Tue Jan 31 14:20:55 MST 2006
Author: oej
Date: Mon Jan 30 12:51:02 2006
New Revision: 8919
URL: http://svn.digium.com/view/asterisk?rev=8919&view=rev
Log:
Issue #5793
- simplification of check_auth
- constifications
- whitespace changes
Rizzo's patch with some changes
Modified:
trunk/channels/chan_sip.c
Modified: trunk/channels/chan_sip.c
URL: http://svn.digium.com/view/asterisk/trunk/channels/chan_sip.c?rev=8919&r1=8918&r2=8919&view=diff
==============================================================================
--- trunk/channels/chan_sip.c (original)
+++ trunk/channels/chan_sip.c Mon Jan 30 12:51:02 2006
@@ -897,7 +897,7 @@
static int transmit_response(struct sip_pvt *p, char *msg, struct sip_request *req);
static int transmit_response_with_sdp(struct sip_pvt *p, char *msg, struct sip_request *req, int retrans);
static int transmit_response_with_unsupported(struct sip_pvt *p, char *msg, struct sip_request *req, char *unsupported);
-static int transmit_response_with_auth(struct sip_pvt *p, char *msg, struct sip_request *req, const char *rand, int reliable, char *header, int stale);
+static int transmit_response_with_auth(struct sip_pvt *p, const char *msg, struct sip_request *req, const char *rand, int reliable, const char *header, int stale);
static int transmit_request(struct sip_pvt *p, int sipmethod, int inc, int reliable, int newbranch);
static int transmit_request_with_auth(struct sip_pvt *p, int sipmethod, int inc, int reliable, int newbranch);
static int transmit_invite(struct sip_pvt *p, int sipmethod, int sendsdp, int init);
@@ -916,7 +916,6 @@
static struct sip_user *build_user(const char *name, struct ast_variable *v, int realtime);
static int sip_do_reload(enum channelreloadreason reason);
static int expire_register(void *data);
-
static struct ast_channel *sip_request_call(const char *type, int format, void *data, int *cause);
static int sip_devicestate(void *data);
static int sip_sendtext(struct ast_channel *ast, const char *text);
@@ -932,6 +931,9 @@
static int clear_realm_authentication(struct sip_auth *authlist); /* Clear realm authentication list (at reload) */
static struct sip_auth *add_realm_authentication(struct sip_auth *authlist, char *configuration, int lineno); /* Add realm authentication in list */
static struct sip_auth *find_realm_authentication(struct sip_auth *authlist, const char *realm); /* Find authentication for a specific realm */
+static int check_auth(struct sip_pvt *p, struct sip_request *req, const char *username,
+ const char *secret, const char *md5secret, int sipmethod,
+ char *uri, int reliable, int ignore);
static int check_sip_domain(const char *domain, char *context, size_t len); /* Check if domain is one of our local domains */
static void append_date(struct sip_request *req); /* Append date to SIP packet */
static int determine_firstline_parts(struct sip_request *req);
@@ -943,7 +945,7 @@
static unsigned int parse_sip_options(struct sip_pvt *pvt, char *supported);
static void sip_destroy(struct sip_pvt *p);
static void parse_request(struct sip_request *req);
-static char *get_header(struct sip_request *req, char *name);
+static char *get_header(struct sip_request *req, const char *name);
static void copy_request(struct sip_request *dst,struct sip_request *src);
static int transmit_response_reliable(struct sip_pvt *p, char *msg, struct sip_request *req, int fatal);
static int transmit_register(struct sip_registry *r, int sipmethod, char *auth, char *authheader);
@@ -2968,7 +2970,7 @@
return _default;
}
-static char *__get_header(struct sip_request *req, char *name, int *start)
+static char *__get_header(struct sip_request *req, const char *name, int *start)
{
int pass;
@@ -3004,7 +3006,7 @@
}
/*! \brief Get header from SIP request */
-static char *get_header(struct sip_request *req, char *name)
+static char *get_header(struct sip_request *req, const char *name)
{
int start = 0;
return __get_header(req, name, &start);
@@ -4043,7 +4045,7 @@
}
/*! \brief Initialize SIP response, based on SIP request */
-static int init_resp(struct sip_request *req, char *resp, struct sip_request *orig)
+static int init_resp(struct sip_request *req, const char *resp, struct sip_request *orig)
{
/* Initialize a response */
if (req->headers || req->len) {
@@ -4076,7 +4078,7 @@
/*! \brief Prepare SIP response packet */
-static int respprep(struct sip_request *resp, struct sip_pvt *p, char *msg, struct sip_request *req)
+static int respprep(struct sip_request *resp, struct sip_pvt *p, const char *msg, struct sip_request *req)
{
char newto[256], *ot;
@@ -4307,7 +4309,7 @@
}
/*! \brief Respond with authorization request */
-static int transmit_response_with_auth(struct sip_pvt *p, char *msg, struct sip_request *req, const char *randdata, int reliable, char *header, int stale)
+static int transmit_response_with_auth(struct sip_pvt *p, const char *msg, struct sip_request *req, const char *randdata, int reliable, const char *header, int stale)
{
struct sip_request resp;
char tmp[256];
@@ -6182,19 +6184,19 @@
/*! \brief Check user authorization from peer definition
Some actions, like REGISTER and INVITEs from peers require
- authentication (if peer have secret set) */
+ authentication (if peer have secret set)
+ \return -1 on Error, 0 on success, 1 on challenge sent
+
+*/
static int check_auth(struct sip_pvt *p, struct sip_request *req, const char *username,
const char *secret, const char *md5secret, int sipmethod,
char *uri, int reliable, int ignore)
{
- int res = -1;
- char *response = "407 Proxy Authentication Required";
- char *reqheader = "Proxy-Authorization";
- char *respheader = "Proxy-Authenticate";
- char *authtoken;
-#ifdef OSP_SUPPORT
- char *osptoken;
-#endif
+ const char *response = "407 Proxy Authentication Required";
+ const char *reqheader = "Proxy-Authorization";
+ const char *respheader = "Proxy-Authenticate";
+ const char *authtoken;
+
/* Always OK if no secret */
if (ast_strlen_zero(secret) && ast_strlen_zero(md5secret)
#ifdef OSP_SUPPORT
@@ -6213,36 +6215,30 @@
}
#ifdef OSP_SUPPORT
else {
- ast_log (LOG_DEBUG, "Checking OSP Authentication!\n");
+ char *osptoken;
+ if (option_debug)
+ ast_log (LOG_DEBUG, "Checking OSP Authentication!\n");
osptoken = get_header (req, "P-OSP-Auth-Token");
switch (ast_test_flag (p, SIP_OSPAUTH)) {
case SIP_OSPAUTH_NO:
break;
case SIP_OSPAUTH_GATEWAY:
- if (ast_strlen_zero (osptoken)) {
- if (ast_strlen_zero (secret) && ast_strlen_zero (md5secret)) {
+ if (ast_strlen_zero(osptoken)) {
+ if (ast_strlen_zero(secret) && ast_strlen_zero (md5secret))
return 0;
- }
- }
- else {
- return check_osptoken (p, osptoken);
+ } else {
+ return check_osptoken(p, osptoken);
}
break;
case SIP_OSPAUTH_PROXY:
- if (ast_strlen_zero (osptoken)) {
+ if (ast_strlen_zero(osptoken))
return 0;
- }
- else {
- return check_osptoken (p, osptoken);
- }
+ return check_osptoken(p, osptoken);
break;
case SIP_OSPAUTH_EXCLUSIVE:
- if (ast_strlen_zero (osptoken)) {
+ if (ast_strlen_zero(osptoken))
return -1;
- }
- else {
- return check_osptoken (p, osptoken);
- }
+ return check_osptoken(p, osptoken);
break;
default:
return -1;
@@ -6253,134 +6249,108 @@
if (ignore && !ast_strlen_zero(p->randdata) && ast_strlen_zero(authtoken)) {
/* This is a retransmitted invite/register/etc, don't reconstruct authentication
information */
- if (!ast_strlen_zero(p->randdata)) {
- if (!reliable) {
- /* Resend message if this was NOT a reliable delivery. Otherwise the
- retransmission should get it */
- transmit_response_with_auth(p, response, req, p->randdata, reliable, respheader, 0);
- /* Schedule auto destroy in 15 seconds */
- sip_scheddestroy(p, 15000);
- }
- res = 1;
- }
+ if (!reliable) {
+ /* Resend message if this was NOT a reliable delivery. Otherwise the
+ retransmission should get it */
+ transmit_response_with_auth(p, response, req, p->randdata, reliable, respheader, 0);
+ /* Schedule auto destroy in 32 seconds (according to RFC 3261) */
+ sip_scheddestroy(p, 32000);
+ }
+ return 1; /* Auth sent */
} else if (ast_strlen_zero(p->randdata) || ast_strlen_zero(authtoken)) {
- ast_string_field_build(p, randdata, "%08x", thread_safe_rand());
+ /* We have no auth, so issue challenge and request authentication */
+ ast_string_field_build(p, randdata, "%08x", thread_safe_rand()); /* Create nonce for challenge */
transmit_response_with_auth(p, response, req, p->randdata, reliable, respheader, 0);
- /* Schedule auto destroy in 15 seconds */
- sip_scheddestroy(p, 15000);
- res = 1;
- } else {
+ /* Schedule auto destroy in 32 seconds */
+ sip_scheddestroy(p, 32000);
+ return 1; /* Auth sent */
+ } else { /* We have auth, so check it */
/* Whoever came up with the authentication section of SIP can suck my %&#$&* for not putting
- an example in the spec of just what it is you're doing a hash on. */
- char a1[256];
- char a2[256];
+ an example in the spec of just what it is you're doing a hash on. */
char a1_hash[256];
- char a2_hash[256];
- char resp[256];
char resp_hash[256]="";
char tmp[256];
char *c;
- char *z;
- char *ua_hash ="";
- char *resp_uri ="";
- char *nonce = "";
- char *digestusername = "";
int wrongnonce = FALSE;
- const char *usednonce = p->randdata;
-
- /* Find their response among the mess that we'r sent for comparison */
+ int good_response;
+ const char *usednonce = p->randdata; /* XXX check */
+
+ /* table of recognised keywords, and their value in the digest */
+ enum keys { K_RESP, K_URI, K_USER, K_NONCE, K_LAST };
+ struct x {
+ const char *key;
+ const char *s;
+ } *i, keys[] = {
+ [K_RESP] = { "response=", "" },
+ [K_URI] = { "uri=", "" },
+ [K_USER] = { "username=", "" },
+ [K_NONCE] = { "nonce=", "" },
+ [K_LAST] = { NULL, NULL}
+ };
+
+ /* Make a copy of the response and parse it */
ast_copy_string(tmp, authtoken, sizeof(tmp));
c = tmp;
- while(c) {
- c = ast_skip_blanks(c);
- if (!*c)
+ while(c && *(c = ast_skip_blanks(c)) ) { /* lookup for keys */
+ for (i = keys; i->key != NULL; i++) {
+ const char *separator = ","; /* default */
+
+ if (strncasecmp(c, i->key, strlen(i->key)) != 0)
+ continue;
+ /* Found. Skip keyword, take text in quotes or up to the separator. */
+ c += strlen(i->key);
+ if (*c == '"') { /* in quotes. Skip first and look for last */
+ c++;
+ separator = "\"";
+ }
+ i->s = c;
+ strsep(&c, separator);
break;
- if (!strncasecmp(c, "response=", strlen("response="))) {
- c+= strlen("response=");
- if ((*c == '\"')) {
- ua_hash=++c;
- if ((c = strchr(c,'\"')))
- *c = '\0';
-
- } else {
- ua_hash=c;
- if ((c = strchr(c,',')))
- *c = '\0';
- }
-
- } else if (!strncasecmp(c, "uri=", strlen("uri="))) {
- c+= strlen("uri=");
- if ((*c == '\"')) {
- resp_uri=++c;
- if ((c = strchr(c,'\"')))
- *c = '\0';
- } else {
- resp_uri=c;
- if ((c = strchr(c,',')))
- *c = '\0';
- }
-
- } else if (!strncasecmp(c, "username=", strlen("username="))) {
- c+= strlen("username=");
- if ((*c == '\"')) {
- digestusername=++c;
- if((c = strchr(c,'\"')))
- *c = '\0';
- } else {
- digestusername=c;
- if((c = strchr(c,',')))
- *c = '\0';
- }
- } else if (!strncasecmp(c, "nonce=", strlen("nonce="))) {
- c+= strlen("nonce=");
- if ((*c == '\"')) {
- nonce=++c;
- if ((c = strchr(c,'\"')))
- *c = '\0';
- } else {
- nonce=c;
- if ((c = strchr(c,',')))
- *c = '\0';
- }
-
- } else
- if ((z = strchr(c,' ')) || (z = strchr(c,','))) c=z;
- if (c)
- c++;
+ }
+ if (i->key == NULL) /* not found, jump after space or comma */
+ strsep(&c, " ,");
}
/* Verify that digest username matches the username we auth as */
- if (strcmp(username, digestusername)) {
+ if (strcmp(username, keys[K_USER].s)) {
+ ast_log(LOG_WARNING, "username mismatch, have <%s>, digest has <%s>\n",
+ username, keys[K_USER].s);
/* Oops, we're trying something here */
return -2;
}
/* Verify nonce from request matches our nonce. If not, send 401 with new nonce */
- if (strcasecmp(p->randdata, nonce)) {
+ if (strcasecmp(p->randdata, keys[K_NONCE].s)) { /* XXX it was 'n'casecmp ? */
wrongnonce = TRUE;
- usednonce = nonce;
- }
-
- snprintf(a1, sizeof(a1), "%s:%s:%s", username, global_realm, secret);
-
- if (!ast_strlen_zero(resp_uri))
- snprintf(a2, sizeof(a2), "%s:%s", sip_methods[sipmethod].text, resp_uri);
- else
- snprintf(a2, sizeof(a2), "%s:%s", sip_methods[sipmethod].text, uri);
+ usednonce = keys[K_NONCE].s;
+ }
if (!ast_strlen_zero(md5secret))
- snprintf(a1_hash, sizeof(a1_hash), "%s", md5secret);
- else
+ ast_copy_string(a1_hash, md5secret, sizeof(a1_hash));
+ else {
+ char a1[256];
+ snprintf(a1, sizeof(a1), "%s:%s:%s", username, global_realm, secret);
ast_md5_hash(a1_hash, a1);
-
- ast_md5_hash(a2_hash, a2);
-
- snprintf(resp, sizeof(resp), "%s:%s:%s", a1_hash, usednonce, a2_hash);
- ast_md5_hash(resp_hash, resp);
-
+ }
+
+ /* compute the expected response to compare with what we received */
+ {
+ char a2[256];
+ char a2_hash[256];
+ char resp[256];
+
+ snprintf(a2, sizeof(a2), "%s:%s", sip_methods[sipmethod].text,
+ !ast_strlen_zero(keys[K_URI].s) ? keys[K_URI].s : uri);
+ ast_md5_hash(a2_hash, a2);
+ snprintf(resp, sizeof(resp), "%s:%s:%s", a1_hash, usednonce, a2_hash);
+ ast_md5_hash(resp_hash, resp);
+ }
+
+ good_response = keys[K_RESP].s &&
+ !strncasecmp(keys[K_RESP].s, resp_hash, strlen(resp_hash));
if (wrongnonce) {
ast_string_field_build(p, randdata, "%08x", thread_safe_rand());
- if (ua_hash && !strncasecmp(ua_hash, resp_hash, strlen(resp_hash))) {
+ if (good_response) {
if (sipdebug)
ast_log(LOG_NOTICE, "stale nonce received from '%s'\n", get_header(req, "To"));
/* We got working auth token, based on stale nonce . */
@@ -6392,18 +6362,15 @@
transmit_response_with_auth(p, response, req, p->randdata, reliable, respheader, 0);
}
- /* Schedule auto destroy in 15 seconds */
- sip_scheddestroy(p, 15000);
- return 1;
+ /* Schedule auto destroy in 32 seconds */
+ sip_scheddestroy(p, 32000);
+ return 1; /* Challenge sent */
}
- /* resp_hash now has the expected response, compare the two */
- if (ua_hash && !strncasecmp(ua_hash, resp_hash, strlen(resp_hash))) {
- /* Auth is OK */
- res = 0;
- }
+ if (good_response) /* Auth is OK */
+ return 0;
}
/* Failure */
- return res;
+ return -1;
}
/*! \brief Callback for the devicestate notification (SUBSCRIBE) support subsystem
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