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author | Aris Adamantiadis <aris@0xbadc0de.be> | 2014-02-01 17:34:16 +0100 |
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committer | Aris Adamantiadis <aris@0xbadc0de.be> | 2014-02-04 16:01:37 +0100 |
commit | 8ed0c0b3c87ae7e9865ea68495657f646565fd84 (patch) | |
tree | 75954b9df33f7bade26aebdac8a5bcb87edb8ba2 | |
parent | ce39d2fa73b72ce16a75ff2c17fe640e8da2ffb2 (diff) | |
download | libssh-8ed0c0b3c87ae7e9865ea68495657f646565fd84.tar.gz libssh-8ed0c0b3c87ae7e9865ea68495657f646565fd84.tar.xz libssh-8ed0c0b3c87ae7e9865ea68495657f646565fd84.zip |
Knownhosts: implement hostkey with knownhosts heuristic
-rw-r--r-- | src/kex.c | 25 |
1 files changed, 24 insertions, 1 deletions
@@ -380,11 +380,34 @@ void ssh_list_kex(struct ssh_kex_struct *kex) { int set_client_kex(ssh_session session){ struct ssh_kex_struct *client= &session->next_crypto->client_kex; const char *wanted; - int i; + char methods_buffer[128]={0}; + int prefered_hostkeys[]={SSH_KEYTYPE_ECDSA, SSH_KEYTYPE_RSA, + SSH_KEYTYPE_DSS, SSH_KEYTYPE_RSA1, SSH_KEYTYPE_UNKNOWN}; + int i, methods, needcoma=0; ssh_get_random(client->cookie, 16, 0); memset(client->methods, 0, KEX_METHODS_SIZE * sizeof(char **)); + /* first check if we have specific host key methods */ + if(session->opts.wanted_methods[SSH_HOSTKEYS] == NULL){ + /* Only if no override */ + methods = ssh_knownhosts_algorithms(session); + if (methods != SSH_ERROR && methods != 0){ + for(i=0; prefered_hostkeys[i] != SSH_KEYTYPE_UNKNOWN;++i){ + if (methods & (1 << prefered_hostkeys[i])){ + if (verify_existing_algo(SSH_HOSTKEYS, ssh_key_type_to_char(prefered_hostkeys[i]))){ + if(needcoma) + strcat(methods_buffer,","); + strcat(methods_buffer, ssh_key_type_to_char(prefered_hostkeys[i])); + needcoma = 1; + } + } + } + SSH_LOG(SSH_LOG_DEBUG, "Changing host key method to \"%s\"", methods_buffer); + session->opts.wanted_methods[SSH_HOSTKEYS] = strdup(methods_buffer); + } + } + for (i = 0; i < KEX_METHODS_SIZE; i++) { wanted = session->opts.wanted_methods[i]; if (wanted == NULL) |