SSH: move knownhost logic to separate function
This commit is contained in:
Daniel Stenberg
parent
b903186fa0
commit
9869668884
192
lib/ssh.c
192
lib/ssh.c
@ -504,100 +504,16 @@ static int sshkeycallback(CURL *easy,
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#define libssh2_session_startup(x,y) libssh2_session_handshake(x,y)
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#endif
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/*
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* ssh_statemach_act() runs the SSH state machine as far as it can without
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* blocking and without reaching the end. The data the pointer 'block' points
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* to will be set to TRUE if the libssh2 function returns LIBSSH2_ERROR_EAGAIN
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* meaning it wants to be called again when the socket is ready
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*/
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static CURLcode ssh_statemach_act(struct connectdata *conn, bool *block)
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static CURLcode ssh_knownhost(struct connectdata *conn)
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{
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CURLcode result = CURLE_OK;
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struct SessionHandle *data = conn->data;
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struct SSHPROTO *sftp_scp = data->state.proto.ssh;
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struct ssh_conn *sshc = &conn->proto.sshc;
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curl_socket_t sock = conn->sock[FIRSTSOCKET];
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#ifdef CURL_LIBSSH2_DEBUG
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const char *fingerprint;
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#endif /* CURL_LIBSSH2_DEBUG */
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const char *host_public_key_md5;
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int rc = LIBSSH2_ERROR_NONE, i;
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int err;
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int seekerr = CURL_SEEKFUNC_OK;
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*block = 0; /* we're not blocking by default */
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do {
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switch(sshc->state) {
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case SSH_S_STARTUP:
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sshc->secondCreateDirs = 0;
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sshc->nextstate = SSH_NO_STATE;
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sshc->actualcode = CURLE_OK;
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rc = libssh2_session_startup(sshc->ssh_session, sock);
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if(rc == LIBSSH2_ERROR_EAGAIN) {
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break;
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}
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else if(rc) {
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failf(data, "Failure establishing ssh session");
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state(conn, SSH_SESSION_FREE);
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sshc->actualcode = CURLE_FAILED_INIT;
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break;
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}
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/* Set libssh2 to non-blocking, since everything internally is
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non-blocking */
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libssh2_session_set_blocking(sshc->ssh_session, 0);
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state(conn, SSH_HOSTKEY);
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/* fall-through */
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case SSH_HOSTKEY:
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#ifdef CURL_LIBSSH2_DEBUG
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/*
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* Before we authenticate we should check the hostkey's fingerprint
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* against our known hosts. How that is handled (reading from file,
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* whatever) is up to us. As for know not much is implemented, besides
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* showing how to get the fingerprint.
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*/
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fingerprint = libssh2_hostkey_hash(sshc->ssh_session,
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LIBSSH2_HOSTKEY_HASH_MD5);
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/* The fingerprint points to static storage (!), don't free() it. */
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infof(data, "Fingerprint: ");
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for(rc = 0; rc < 16; rc++)
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infof(data, "%02X ", (unsigned char) fingerprint[rc]);
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infof(data, "\n");
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#endif /* CURL_LIBSSH2_DEBUG */
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/* Before we authenticate we check the hostkey's MD5 fingerprint
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* against a known fingerprint, if available. This implementation pulls
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* it from the curl option.
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*/
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if(data->set.str[STRING_SSH_HOST_PUBLIC_KEY_MD5] &&
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strlen(data->set.str[STRING_SSH_HOST_PUBLIC_KEY_MD5]) == 32) {
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char buf[33];
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host_public_key_md5 = libssh2_hostkey_hash(sshc->ssh_session,
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LIBSSH2_HOSTKEY_HASH_MD5);
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for(i = 0; i < 16; i++)
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snprintf(&buf[i*2], 3, "%02x",
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(unsigned char) host_public_key_md5[i]);
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if(!strequal(buf, data->set.str[STRING_SSH_HOST_PUBLIC_KEY_MD5])) {
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failf(data,
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"Denied establishing ssh session: mismatch md5 fingerprint. "
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"Remote %s is not equal to %s",
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buf, data->set.str[STRING_SSH_HOST_PUBLIC_KEY_MD5]);
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state(conn, SSH_SESSION_FREE);
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sshc->actualcode = CURLE_PEER_FAILED_VERIFICATION;
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break;
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}
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}
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CURLcode result = CURLE_OK;
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#ifdef HAVE_LIBSSH2_KNOWNHOST_API
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if(data->set.str[STRING_SSH_KNOWNHOSTS]) {
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/* we're asked to verify the host against a file */
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struct ssh_conn *sshc = &conn->proto.sshc;
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int rc;
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int keytype;
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size_t keylen;
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const char *remotekey = libssh2_session_hostkey(sshc->ssh_session,
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@ -704,8 +620,106 @@ static CURLcode ssh_statemach_act(struct connectdata *conn, bool *block)
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break;
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}
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}
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#endif /* HAVE_LIBSSH2_KNOWNHOST_API */
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#else /* HAVE_LIBSSH2_KNOWNHOST_API */
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(void)conn;
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#endif
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return result;
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}
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/*
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* ssh_statemach_act() runs the SSH state machine as far as it can without
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* blocking and without reaching the end. The data the pointer 'block' points
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* to will be set to TRUE if the libssh2 function returns LIBSSH2_ERROR_EAGAIN
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* meaning it wants to be called again when the socket is ready
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*/
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static CURLcode ssh_statemach_act(struct connectdata *conn, bool *block)
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{
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CURLcode result = CURLE_OK;
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struct SessionHandle *data = conn->data;
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struct SSHPROTO *sftp_scp = data->state.proto.ssh;
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struct ssh_conn *sshc = &conn->proto.sshc;
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curl_socket_t sock = conn->sock[FIRSTSOCKET];
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#ifdef CURL_LIBSSH2_DEBUG
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const char *fingerprint;
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#endif /* CURL_LIBSSH2_DEBUG */
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const char *host_public_key_md5;
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int rc = LIBSSH2_ERROR_NONE, i;
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int err;
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int seekerr = CURL_SEEKFUNC_OK;
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*block = 0; /* we're not blocking by default */
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do {
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switch(sshc->state) {
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case SSH_S_STARTUP:
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sshc->secondCreateDirs = 0;
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sshc->nextstate = SSH_NO_STATE;
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sshc->actualcode = CURLE_OK;
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rc = libssh2_session_startup(sshc->ssh_session, sock);
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if(rc == LIBSSH2_ERROR_EAGAIN) {
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break;
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}
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else if(rc) {
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failf(data, "Failure establishing ssh session");
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state(conn, SSH_SESSION_FREE);
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sshc->actualcode = CURLE_FAILED_INIT;
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break;
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}
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/* Set libssh2 to non-blocking, since everything internally is
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non-blocking */
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libssh2_session_set_blocking(sshc->ssh_session, 0);
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state(conn, SSH_HOSTKEY);
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/* fall-through */
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case SSH_HOSTKEY:
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#ifdef CURL_LIBSSH2_DEBUG
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/*
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* Before we authenticate we should check the hostkey's fingerprint
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* against our known hosts. How that is handled (reading from file,
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* whatever) is up to us. As for know not much is implemented, besides
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* showing how to get the fingerprint.
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*/
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fingerprint = libssh2_hostkey_hash(sshc->ssh_session,
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LIBSSH2_HOSTKEY_HASH_MD5);
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/* The fingerprint points to static storage (!), don't free() it. */
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infof(data, "Fingerprint: ");
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for(rc = 0; rc < 16; rc++)
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infof(data, "%02X ", (unsigned char) fingerprint[rc]);
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infof(data, "\n");
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#endif /* CURL_LIBSSH2_DEBUG */
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/* Before we authenticate we check the hostkey's MD5 fingerprint
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* against a known fingerprint, if available. This implementation pulls
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* it from the curl option.
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*/
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if(data->set.str[STRING_SSH_HOST_PUBLIC_KEY_MD5] &&
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strlen(data->set.str[STRING_SSH_HOST_PUBLIC_KEY_MD5]) == 32) {
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char buf[33];
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host_public_key_md5 = libssh2_hostkey_hash(sshc->ssh_session,
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LIBSSH2_HOSTKEY_HASH_MD5);
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for(i = 0; i < 16; i++)
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snprintf(&buf[i*2], 3, "%02x",
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(unsigned char) host_public_key_md5[i]);
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if(!strequal(buf, data->set.str[STRING_SSH_HOST_PUBLIC_KEY_MD5])) {
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failf(data,
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"Denied establishing ssh session: mismatch md5 fingerprint. "
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"Remote %s is not equal to %s",
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buf, data->set.str[STRING_SSH_HOST_PUBLIC_KEY_MD5]);
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state(conn, SSH_SESSION_FREE);
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sshc->actualcode = CURLE_PEER_FAILED_VERIFICATION;
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break;
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}
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}
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result = ssh_knownhost(conn);
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if(!result)
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state(conn, SSH_AUTHLIST);
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break;
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