Move ssh_match_group() from misc.c to match.c

ssh_match_group() has been moved from misc.c to match.c, because it fits
better with other match_*() functions in match.c

The name of the function has also been changed from "ssh_match_group" to
"match_group" to be consistent with the naming of the other match.c
functions.

Signed-off-by: Eshan Kelkar <eshankelkar@galorithm.com>
Reviewed-by: Jakub Jelen <jjelen@redhat.com>
Reviewed-by: Sahana Prasad <sahana@redhat.com>

include/libssh/misc.h

@@ -105,8 +105,6 @@ void ssh_timestamp_init(struct ssh_timestamp *ts);
 int ssh_timeout_elapsed(struct ssh_timestamp *ts, int timeout);
 int ssh_timeout_update(struct ssh_timestamp *ts, int timeout);
 
-int ssh_match_group(const char *group, const char *object);
-
 void uint64_inc(unsigned char *counter);
 
 void ssh_log_hexdump(const char *descr, const unsigned char *what, size_t len);

include/libssh/priv.h

@@ -335,6 +335,7 @@ int match_cidr_address_list(const char *address,
                             const char *addrlist,
                             int sa_family);
 #endif
+int match_group(const char *group, const char *object);
 
 /* connector.c */
 int ssh_connector_set_event(ssh_connector connector, ssh_event event);

src/kex.c

@@ -510,7 +510,7 @@ SSH_PACKET_CALLBACK(ssh_packet_kexinit)
      * flag and verify packet sequence numbers.
      */
     if (server_kex) {
-        ok = ssh_match_group(crypto->client_kex.methods[SSH_KEX],
+        ok = match_group(crypto->client_kex.methods[SSH_KEX],
                          KEX_STRICT_CLIENT);
         if (ok) {
             SSH_LOG(SSH_LOG_DEBUG, "Client supports strict kex, enabling.");
@@ -518,7 +518,7 @@ SSH_PACKET_CALLBACK(ssh_packet_kexinit)
         }
     } else {
         /* client kex */
-        ok = ssh_match_group(crypto->server_kex.methods[SSH_KEX],
+        ok = match_group(crypto->server_kex.methods[SSH_KEX],
                          KEX_STRICT_SERVER);
         if (ok) {
             SSH_LOG(SSH_LOG_DEBUG, "Server supports strict kex, enabling.");
@@ -531,7 +531,7 @@ SSH_PACKET_CALLBACK(ssh_packet_kexinit)
          * If client sent a ext-info-c message in the kex list, it supports
          * RFC 8308 extension negotiation.
          */
-        ok = ssh_match_group(crypto->client_kex.methods[SSH_KEX],
+        ok = match_group(crypto->client_kex.methods[SSH_KEX],
                          KEX_EXTENSION_CLIENT);
         if (ok) {
             const char *hostkeys = NULL, *wanted_hostkeys = NULL;
@@ -546,7 +546,7 @@ SSH_PACKET_CALLBACK(ssh_packet_kexinit)
              */
             hostkeys = crypto->client_kex.methods[SSH_HOSTKEYS];
             wanted_hostkeys = session->opts.wanted_methods[SSH_HOSTKEYS];
-            ok = ssh_match_group(hostkeys, "rsa-sha2-512");
+            ok = match_group(hostkeys, "rsa-sha2-512");
             if (ok) {
                 /* Check if rsa-sha2-512 is allowed by config */
                 if (wanted_hostkeys != NULL) {
@@ -558,7 +558,7 @@ SSH_PACKET_CALLBACK(ssh_packet_kexinit)
                     SAFE_FREE(is_allowed);
                 }
             }
-            ok = ssh_match_group(hostkeys, "rsa-sha2-256");
+            ok = match_group(hostkeys, "rsa-sha2-256");
             if (ok) {
                 /* Check if rsa-sha2-256 is allowed by config */
                 if (wanted_hostkeys != NULL) {

src/match.c

@@ -577,3 +577,28 @@ match_cidr_address_list(const char *address,
     return rc;
 }
 #endif
+
+int match_group(const char *group, const char *object)
+{
+    const char *a;
+    const char *z;
+
+    z = group;
+    do {
+        a = strchr(z, ',');
+        if (a == NULL) {
+            if (strcmp(z, object) == 0) {
+                return 1;
+            }
+            return 0;
+        } else {
+            if (strncmp(z, object, a - z) == 0) {
+                return 1;
+            }
+        }
+        z = a + 1;
+    } while (1);
+
+    /* not reached */
+    return 0;
+}

src/messages.c

@@ -933,9 +933,9 @@ SSH_PACKET_CALLBACK(ssh_packet_userauth_request){
         if (rc == SSH_OK) {
             /* Check if the signature from client matches server preferences */
             if (session->opts.pubkey_accepted_types) {
-                if (!ssh_match_group(session->opts.pubkey_accepted_types,
+                cmp = match_group(session->opts.pubkey_accepted_types,
-                            sig->type_c))
+                                  sig->type_c);
-                {
+                if (cmp != 1) {
                     ssh_set_error(session,
                             SSH_FATAL,
                             "Public key from client (%s) doesn't match server "

src/misc.c

@@ -1571,32 +1571,6 @@ int ssh_timeout_update(struct ssh_timestamp *ts, int timeout)
   return ret >= 0 ? ret: 0;
 }
 
-
-int ssh_match_group(const char *group, const char *object)
-{
-    const char *a;
-    const char *z;
-
-    z = group;
-    do {
-        a = strchr(z, ',');
-        if (a == NULL) {
-            if (strcmp(z, object) == 0) {
-                return 1;
-            }
-            return 0;
-        } else {
-            if (strncmp(z, object, a - z) == 0) {
-                return 1;
-            }
-        }
-        z = a + 1;
-    } while(1);
-
-    /* not reached */
-    return 0;
-}
-
 #if !defined(HAVE_EXPLICIT_BZERO)
 void explicit_bzero(void *s, size_t n)
 {

src/packet_cb.c

@@ -170,7 +170,7 @@ SSH_PACKET_CALLBACK(ssh_packet_newkeys)
 
         /* Check if signature from server matches user preferences */
         if (session->opts.wanted_methods[SSH_HOSTKEYS]) {
-            rc = ssh_match_group(session->opts.wanted_methods[SSH_HOSTKEYS],
+            rc = match_group(session->opts.wanted_methods[SSH_HOSTKEYS],
                              sig->type_c);
             if (rc == 0) {
                 ssh_set_error(session,
@@ -277,10 +277,14 @@ SSH_PACKET_CALLBACK(ssh_packet_ext_info)
         if (cmp == 0) {
             /* TODO check for NULL bytes */
             SSH_LOG(SSH_LOG_PACKET, "Extension: %s=<%s>", name, value);
-            if (ssh_match_group(value, "rsa-sha2-512")) {
+
+            rc = match_group(value, "rsa-sha2-512");
+            if (rc == 1) {
                 session->extensions |= SSH_EXT_SIG_RSA_SHA512;
             }
-            if (ssh_match_group(value, "rsa-sha2-256")) {
+
+            rc = match_group(value, "rsa-sha2-256");
+            if (rc == 1) {
                 session->extensions |= SSH_EXT_SIG_RSA_SHA256;
             }
         } else {

src/pki.c

@@ -371,7 +371,7 @@ int ssh_key_algorithm_allowed(ssh_session session, const char *type)
     }
 
     SSH_LOG(SSH_LOG_DEBUG, "Checking %s with list <%s>", type, allowed_list);
-    return ssh_match_group(allowed_list, type);
+    return match_group(allowed_list, type);
 }
 
 bool ssh_key_size_allowed_rsa(int min_size, ssh_key key)