Merge 1.0.0 changes back to master.
This commit is contained in:
commit
67680bd2d5
@ -22,6 +22,9 @@
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#include "config.h"
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#include "config.h"
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#include <guacamole/client.h>
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#include <libssh2.h>
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#include <openssl/ossl_typ.h>
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#include <openssl/ossl_typ.h>
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/**
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/**
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@ -166,5 +169,52 @@ void guac_common_ssh_key_free(guac_common_ssh_key* key);
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int guac_common_ssh_key_sign(guac_common_ssh_key* key, const char* data,
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int guac_common_ssh_key_sign(guac_common_ssh_key* key, const char* data,
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int length, unsigned char* sig);
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int length, unsigned char* sig);
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/**
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* Verifies the host key for the given hostname/port combination against
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* one or more known_hosts entries. The known_host entries can either be a
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* single host_key, provided by the client, or a set of known_hosts entries
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* provided in the /etc/guacamole/ssh_known_hosts file. Failure to correctly
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* load the known_hosts entries will result in a connection abort and a returned
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* error code. A return code of zero indiciates that either no known_hosts entries
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* were provided, or that the verification succeeded (match). Negative values
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* indicate internal libssh2 error codes; positive values indicate a failure
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* during verification of the host key against the known hosts.
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*
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* @param session
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* A pointer to the LIBSSH2_SESSION structure of the SSH connection already
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* in progress.
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*
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* @param client
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* The current guac_client instance for which the known_hosts checking is
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* being performed.
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*
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* @param host_key
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* The known host entry provided by the client. If this is non-null and not
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* empty, it will be the only host key loaded and used for verification. If
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* this is null or empty an attempt will be made to read the
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* /etc/guacamole/ssh_known_hosts file and load entries from it.
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*
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* @param hostname
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* The hostname or IP of the server that is being verified.
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*
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* @param port
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* The port number of the server being verified.
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*
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* @param remote_hostkey
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* The host key of the remote system being verified.
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*
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* @param remote_hostkey_len
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* The length of the remote host key being verified
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*
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* @return
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* The status of the known_hosts check. This will be zero if no entries
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* are provided or if the match succeeds, negative to indicate internal
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* libssh2 errors, or positive to indicate failures during host key
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* checking.
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*/
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int guac_common_ssh_verify_host_key(LIBSSH2_SESSION* session, guac_client* client,
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const char* host_key, const char* hostname, int port, const char* remote_hostkey,
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const size_t remote_hostkey_len);
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#endif
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#endif
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@ -98,7 +98,8 @@ void guac_common_ssh_uninit();
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* if the connection or authentication were not successful.
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* if the connection or authentication were not successful.
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*/
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*/
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guac_common_ssh_session* guac_common_ssh_create_session(guac_client* client,
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guac_common_ssh_session* guac_common_ssh_create_session(guac_client* client,
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const char* hostname, const char* port, guac_common_ssh_user* user, int keepalive);
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const char* hostname, const char* port, guac_common_ssh_user* user, int keepalive,
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const char* host_key);
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/**
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/**
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* Disconnects and destroys the given SSH session, freeing all associated
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* Disconnects and destroys the given SSH session, freeing all associated
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@ -35,6 +35,7 @@
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#include <stdlib.h>
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#include <stdlib.h>
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#include <string.h>
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#include <string.h>
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#include <unistd.h>
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guac_common_ssh_key* guac_common_ssh_key_alloc(char* data, int length,
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guac_common_ssh_key* guac_common_ssh_key_alloc(char* data, int length,
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char* passphrase) {
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char* passphrase) {
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@ -245,3 +246,86 @@ int guac_common_ssh_key_sign(guac_common_ssh_key* key, const char* data,
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}
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}
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int guac_common_ssh_verify_host_key(LIBSSH2_SESSION* session, guac_client* client,
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const char* host_key, const char* hostname, int port, const char* remote_hostkey,
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const size_t remote_hostkey_len) {
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LIBSSH2_KNOWNHOSTS* ssh_known_hosts = libssh2_knownhost_init(session);
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int known_hosts = 0;
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/* Add host key provided from settings */
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if (host_key && strcmp(host_key, "") != 0) {
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known_hosts = libssh2_knownhost_readline(ssh_known_hosts, host_key, strlen(host_key),
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LIBSSH2_KNOWNHOST_FILE_OPENSSH);
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/* readline function returns 0 on success, so we increment to indicate a valid entry */
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|
if (known_hosts == 0)
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known_hosts++;
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}
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/* Otherwise, we look for a ssh_known_hosts file within GUACAMOLE_HOME and read that in. */
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else {
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const char *guac_known_hosts = "/etc/guacamole/ssh_known_hosts";
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if (access(guac_known_hosts, F_OK) != -1)
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known_hosts = libssh2_knownhost_readfile(ssh_known_hosts, guac_known_hosts, LIBSSH2_KNOWNHOST_FILE_OPENSSH);
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}
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/* If there's an error provided, abort connection and return that. */
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if (known_hosts < 0) {
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char* errmsg;
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int errval = libssh2_session_last_error(session, &errmsg, NULL, 0);
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guac_client_log(client, GUAC_LOG_ERROR,
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"Error %d trying to load SSH host keys: %s", errval, errmsg);
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libssh2_knownhost_free(ssh_known_hosts);
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return known_hosts;
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}
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/* No host keys were loaded, so we bail out checking and continue the connection. */
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else if (known_hosts == 0) {
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guac_client_log(client, GUAC_LOG_WARNING,
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"No known host keys provided, host identity will not be verified.");
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libssh2_knownhost_free(ssh_known_hosts);
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return known_hosts;
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}
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/* Check remote host key against known hosts */
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int kh_check = libssh2_knownhost_checkp(ssh_known_hosts, hostname, port,
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remote_hostkey, remote_hostkey_len,
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LIBSSH2_KNOWNHOST_TYPE_PLAIN|
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LIBSSH2_KNOWNHOST_KEYENC_RAW,
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|
NULL);
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/* Deal with the return of the host key check */
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switch (kh_check) {
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case LIBSSH2_KNOWNHOST_CHECK_MATCH:
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guac_client_log(client, GUAC_LOG_DEBUG,
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"Host key match found for %s", hostname);
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break;
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case LIBSSH2_KNOWNHOST_CHECK_NOTFOUND:
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|
guac_client_log(client, GUAC_LOG_ERROR,
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"Host key not found for %s.", hostname);
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break;
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case LIBSSH2_KNOWNHOST_CHECK_MISMATCH:
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guac_client_log(client, GUAC_LOG_ERROR,
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"Host key does not match known hosts entry for %s", hostname);
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break;
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case LIBSSH2_KNOWNHOST_CHECK_FAILURE:
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default:
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guac_client_log(client, GUAC_LOG_ERROR,
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"Host %s could not be checked against known hosts.",
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hostname);
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}
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/* Return the check value */
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libssh2_knownhost_free(ssh_known_hosts);
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return kh_check;
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|
}
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@ -35,6 +35,7 @@
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#include <netdb.h>
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#include <netdb.h>
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#include <netinet/in.h>
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#include <netinet/in.h>
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#include <pthread.h>
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#include <pthread.h>
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#include <pwd.h>
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#include <stddef.h>
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#include <stddef.h>
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#include <stdlib.h>
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#include <stdlib.h>
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#include <string.h>
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#include <string.h>
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@ -414,7 +415,8 @@ static int guac_common_ssh_authenticate(guac_common_ssh_session* common_session)
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}
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}
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|
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guac_common_ssh_session* guac_common_ssh_create_session(guac_client* client,
|
guac_common_ssh_session* guac_common_ssh_create_session(guac_client* client,
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const char* hostname, const char* port, guac_common_ssh_user* user, int keepalive) {
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const char* hostname, const char* port, guac_common_ssh_user* user, int keepalive,
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||||||
|
const char* host_key) {
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|
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int retval;
|
int retval;
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|
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@ -518,6 +520,42 @@ guac_common_ssh_session* guac_common_ssh_create_session(guac_client* client,
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return NULL;
|
return NULL;
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}
|
}
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|
|
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|
/* Get host key of remote system we're connecting to */
|
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|
size_t remote_hostkey_len;
|
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|
const char *remote_hostkey = libssh2_session_hostkey(session, &remote_hostkey_len, NULL);
|
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|
|
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|
/* Failure to retrieve a host key means we should abort */
|
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|
if (!remote_hostkey) {
|
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|
guac_client_abort(client, GUAC_PROTOCOL_STATUS_SERVER_ERROR,
|
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|
"Failed to get host key for %s", hostname);
|
||||||
|
free(common_session);
|
||||||
|
close(fd);
|
||||||
|
return NULL;
|
||||||
|
}
|
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|
|
||||||
|
/* SSH known host key checking. */
|
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|
int known_host_check = guac_common_ssh_verify_host_key(session, client, host_key,
|
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|
hostname, atoi(port), remote_hostkey,
|
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|
remote_hostkey_len);
|
||||||
|
|
||||||
|
/* Abort on any error codes */
|
||||||
|
if (known_host_check != 0) {
|
||||||
|
char* err_msg;
|
||||||
|
libssh2_session_last_error(session, &err_msg, NULL, 0);
|
||||||
|
|
||||||
|
if (known_host_check < 0)
|
||||||
|
guac_client_abort(client, GUAC_PROTOCOL_STATUS_SERVER_ERROR,
|
||||||
|
"Error occurred attempting to check host key: %s", err_msg);
|
||||||
|
|
||||||
|
if (known_host_check > 0)
|
||||||
|
guac_client_abort(client, GUAC_PROTOCOL_STATUS_SERVER_ERROR,
|
||||||
|
"Host key did not match any provided known host keys. %s", err_msg);
|
||||||
|
|
||||||
|
free(common_session);
|
||||||
|
close(fd);
|
||||||
|
return NULL;
|
||||||
|
}
|
||||||
|
|
||||||
/* Store basic session data */
|
/* Store basic session data */
|
||||||
common_session->client = client;
|
common_session->client = client;
|
||||||
common_session->user = user;
|
common_session->user = user;
|
||||||
@ -560,4 +598,3 @@ void guac_common_ssh_destroy_session(guac_common_ssh_session* session) {
|
|||||||
free(session);
|
free(session);
|
||||||
|
|
||||||
}
|
}
|
||||||
|
|
||||||
|
@ -974,7 +974,8 @@ void* guac_rdp_client_thread(void* data) {
|
|||||||
/* Attempt SSH connection */
|
/* Attempt SSH connection */
|
||||||
rdp_client->sftp_session =
|
rdp_client->sftp_session =
|
||||||
guac_common_ssh_create_session(client, settings->sftp_hostname,
|
guac_common_ssh_create_session(client, settings->sftp_hostname,
|
||||||
settings->sftp_port, rdp_client->sftp_user, settings->sftp_server_alive_interval);
|
settings->sftp_port, rdp_client->sftp_user, settings->sftp_server_alive_interval,
|
||||||
|
settings->sftp_host_key);
|
||||||
|
|
||||||
/* Fail if SSH connection does not succeed */
|
/* Fail if SSH connection does not succeed */
|
||||||
if (rdp_client->sftp_session == NULL) {
|
if (rdp_client->sftp_session == NULL) {
|
||||||
|
@ -81,6 +81,7 @@ const char* GUAC_RDP_CLIENT_ARGS[] = {
|
|||||||
#ifdef ENABLE_COMMON_SSH
|
#ifdef ENABLE_COMMON_SSH
|
||||||
"enable-sftp",
|
"enable-sftp",
|
||||||
"sftp-hostname",
|
"sftp-hostname",
|
||||||
|
"sftp-host-key",
|
||||||
"sftp-port",
|
"sftp-port",
|
||||||
"sftp-username",
|
"sftp-username",
|
||||||
"sftp-password",
|
"sftp-password",
|
||||||
@ -355,6 +356,11 @@ enum RDP_ARGS_IDX {
|
|||||||
*/
|
*/
|
||||||
IDX_SFTP_HOSTNAME,
|
IDX_SFTP_HOSTNAME,
|
||||||
|
|
||||||
|
/**
|
||||||
|
* The public SSH host key of the SFTP server. Optional.
|
||||||
|
*/
|
||||||
|
IDX_SFTP_HOST_KEY,
|
||||||
|
|
||||||
/**
|
/**
|
||||||
* The port of the SSH server to connect to for SFTP. If blank, the default
|
* The port of the SSH server to connect to for SFTP. If blank, the default
|
||||||
* SSH port of "22" will be used.
|
* SSH port of "22" will be used.
|
||||||
@ -822,6 +828,11 @@ guac_rdp_settings* guac_rdp_parse_args(guac_user* user,
|
|||||||
guac_user_parse_args_string(user, GUAC_RDP_CLIENT_ARGS, argv,
|
guac_user_parse_args_string(user, GUAC_RDP_CLIENT_ARGS, argv,
|
||||||
IDX_SFTP_HOSTNAME, settings->hostname);
|
IDX_SFTP_HOSTNAME, settings->hostname);
|
||||||
|
|
||||||
|
/* The public SSH host key. */
|
||||||
|
settings->sftp_host_key =
|
||||||
|
guac_user_parse_args_string(user, GUAC_RDP_CLIENT_ARGS, argv,
|
||||||
|
IDX_SFTP_HOST_KEY, NULL);
|
||||||
|
|
||||||
/* Port for SFTP connection */
|
/* Port for SFTP connection */
|
||||||
settings->sftp_port =
|
settings->sftp_port =
|
||||||
guac_user_parse_args_string(user, GUAC_RDP_CLIENT_ARGS, argv,
|
guac_user_parse_args_string(user, GUAC_RDP_CLIENT_ARGS, argv,
|
||||||
@ -999,6 +1010,7 @@ void guac_rdp_settings_free(guac_rdp_settings* settings) {
|
|||||||
/* Free SFTP settings */
|
/* Free SFTP settings */
|
||||||
free(settings->sftp_directory);
|
free(settings->sftp_directory);
|
||||||
free(settings->sftp_root_directory);
|
free(settings->sftp_root_directory);
|
||||||
|
free(settings->sftp_host_key);
|
||||||
free(settings->sftp_hostname);
|
free(settings->sftp_hostname);
|
||||||
free(settings->sftp_passphrase);
|
free(settings->sftp_passphrase);
|
||||||
free(settings->sftp_password);
|
free(settings->sftp_password);
|
||||||
|
@ -342,6 +342,11 @@ typedef struct guac_rdp_settings {
|
|||||||
*/
|
*/
|
||||||
char* sftp_hostname;
|
char* sftp_hostname;
|
||||||
|
|
||||||
|
/**
|
||||||
|
* The public SSH host key.
|
||||||
|
*/
|
||||||
|
char* sftp_host_key;
|
||||||
|
|
||||||
/**
|
/**
|
||||||
* The port of the SSH server to connect to for SFTP.
|
* The port of the SSH server to connect to for SFTP.
|
||||||
*/
|
*/
|
||||||
|
@ -31,6 +31,7 @@
|
|||||||
/* Client plugin arguments */
|
/* Client plugin arguments */
|
||||||
const char* GUAC_SSH_CLIENT_ARGS[] = {
|
const char* GUAC_SSH_CLIENT_ARGS[] = {
|
||||||
"hostname",
|
"hostname",
|
||||||
|
"host-key",
|
||||||
"port",
|
"port",
|
||||||
"username",
|
"username",
|
||||||
"password",
|
"password",
|
||||||
@ -68,6 +69,11 @@ enum SSH_ARGS_IDX {
|
|||||||
*/
|
*/
|
||||||
IDX_HOSTNAME,
|
IDX_HOSTNAME,
|
||||||
|
|
||||||
|
/**
|
||||||
|
* The Base64-encoded public SSH host key. Optional.
|
||||||
|
*/
|
||||||
|
IDX_HOST_KEY,
|
||||||
|
|
||||||
/**
|
/**
|
||||||
* The port to connect to. Optional.
|
* The port to connect to. Optional.
|
||||||
*/
|
*/
|
||||||
@ -247,6 +253,10 @@ guac_ssh_settings* guac_ssh_parse_args(guac_user* user,
|
|||||||
guac_user_parse_args_string(user, GUAC_SSH_CLIENT_ARGS, argv,
|
guac_user_parse_args_string(user, GUAC_SSH_CLIENT_ARGS, argv,
|
||||||
IDX_HOSTNAME, "");
|
IDX_HOSTNAME, "");
|
||||||
|
|
||||||
|
settings->host_key =
|
||||||
|
guac_user_parse_args_string(user, GUAC_SSH_CLIENT_ARGS, argv,
|
||||||
|
IDX_HOST_KEY, NULL);
|
||||||
|
|
||||||
settings->username =
|
settings->username =
|
||||||
guac_user_parse_args_string(user, GUAC_SSH_CLIENT_ARGS, argv,
|
guac_user_parse_args_string(user, GUAC_SSH_CLIENT_ARGS, argv,
|
||||||
IDX_USERNAME, NULL);
|
IDX_USERNAME, NULL);
|
||||||
@ -384,6 +394,7 @@ void guac_ssh_settings_free(guac_ssh_settings* settings) {
|
|||||||
|
|
||||||
/* Free network connection information */
|
/* Free network connection information */
|
||||||
free(settings->hostname);
|
free(settings->hostname);
|
||||||
|
free(settings->host_key);
|
||||||
free(settings->port);
|
free(settings->port);
|
||||||
|
|
||||||
/* Free credentials */
|
/* Free credentials */
|
||||||
@ -417,4 +428,3 @@ void guac_ssh_settings_free(guac_ssh_settings* settings) {
|
|||||||
free(settings);
|
free(settings);
|
||||||
|
|
||||||
}
|
}
|
||||||
|
|
||||||
|
@ -70,6 +70,11 @@ typedef struct guac_ssh_settings {
|
|||||||
*/
|
*/
|
||||||
char* hostname;
|
char* hostname;
|
||||||
|
|
||||||
|
/**
|
||||||
|
* The public SSH host key.
|
||||||
|
*/
|
||||||
|
char* host_key;
|
||||||
|
|
||||||
/**
|
/**
|
||||||
* The port of the SSH server to connect to.
|
* The port of the SSH server to connect to.
|
||||||
*/
|
*/
|
||||||
|
@ -235,7 +235,8 @@ void* ssh_client_thread(void* data) {
|
|||||||
|
|
||||||
/* Open SSH session */
|
/* Open SSH session */
|
||||||
ssh_client->session = guac_common_ssh_create_session(client,
|
ssh_client->session = guac_common_ssh_create_session(client,
|
||||||
settings->hostname, settings->port, ssh_client->user, settings->server_alive_interval);
|
settings->hostname, settings->port, ssh_client->user, settings->server_alive_interval,
|
||||||
|
settings->host_key);
|
||||||
if (ssh_client->session == NULL) {
|
if (ssh_client->session == NULL) {
|
||||||
/* Already aborted within guac_common_ssh_create_session() */
|
/* Already aborted within guac_common_ssh_create_session() */
|
||||||
return NULL;
|
return NULL;
|
||||||
@ -275,7 +276,8 @@ void* ssh_client_thread(void* data) {
|
|||||||
guac_client_log(client, GUAC_LOG_DEBUG, "Reconnecting for SFTP...");
|
guac_client_log(client, GUAC_LOG_DEBUG, "Reconnecting for SFTP...");
|
||||||
ssh_client->sftp_session =
|
ssh_client->sftp_session =
|
||||||
guac_common_ssh_create_session(client, settings->hostname,
|
guac_common_ssh_create_session(client, settings->hostname,
|
||||||
settings->port, ssh_client->user, settings->server_alive_interval);
|
settings->port, ssh_client->user, settings->server_alive_interval,
|
||||||
|
settings->host_key);
|
||||||
if (ssh_client->sftp_session == NULL) {
|
if (ssh_client->sftp_session == NULL) {
|
||||||
/* Already aborted within guac_common_ssh_create_session() */
|
/* Already aborted within guac_common_ssh_create_session() */
|
||||||
return NULL;
|
return NULL;
|
||||||
|
@ -60,6 +60,7 @@ const char* GUAC_VNC_CLIENT_ARGS[] = {
|
|||||||
#ifdef ENABLE_COMMON_SSH
|
#ifdef ENABLE_COMMON_SSH
|
||||||
"enable-sftp",
|
"enable-sftp",
|
||||||
"sftp-hostname",
|
"sftp-hostname",
|
||||||
|
"sftp-host-key",
|
||||||
"sftp-port",
|
"sftp-port",
|
||||||
"sftp-username",
|
"sftp-username",
|
||||||
"sftp-password",
|
"sftp-password",
|
||||||
@ -208,6 +209,11 @@ enum VNC_ARGS_IDX {
|
|||||||
*/
|
*/
|
||||||
IDX_SFTP_USERNAME,
|
IDX_SFTP_USERNAME,
|
||||||
|
|
||||||
|
/**
|
||||||
|
* The public SSH host key to identify the SFTP server.
|
||||||
|
*/
|
||||||
|
IDX_SFTP_HOST_KEY,
|
||||||
|
|
||||||
/**
|
/**
|
||||||
* The password to provide when authenticating with the SSH server for
|
* The password to provide when authenticating with the SSH server for
|
||||||
* SFTP (if not using a private key).
|
* SFTP (if not using a private key).
|
||||||
@ -411,6 +417,11 @@ guac_vnc_settings* guac_vnc_parse_args(guac_user* user,
|
|||||||
guac_user_parse_args_string(user, GUAC_VNC_CLIENT_ARGS, argv,
|
guac_user_parse_args_string(user, GUAC_VNC_CLIENT_ARGS, argv,
|
||||||
IDX_SFTP_HOSTNAME, settings->hostname);
|
IDX_SFTP_HOSTNAME, settings->hostname);
|
||||||
|
|
||||||
|
/* The public SSH host key. */
|
||||||
|
settings->sftp_host_key =
|
||||||
|
guac_user_parse_args_string(user, GUAC_VNC_CLIENT_ARGS, argv,
|
||||||
|
IDX_SFTP_HOST_KEY, NULL);
|
||||||
|
|
||||||
/* Port for SFTP connection */
|
/* Port for SFTP connection */
|
||||||
settings->sftp_port =
|
settings->sftp_port =
|
||||||
guac_user_parse_args_string(user, GUAC_VNC_CLIENT_ARGS, argv,
|
guac_user_parse_args_string(user, GUAC_VNC_CLIENT_ARGS, argv,
|
||||||
@ -504,6 +515,7 @@ void guac_vnc_settings_free(guac_vnc_settings* settings) {
|
|||||||
/* Free SFTP settings */
|
/* Free SFTP settings */
|
||||||
free(settings->sftp_directory);
|
free(settings->sftp_directory);
|
||||||
free(settings->sftp_root_directory);
|
free(settings->sftp_root_directory);
|
||||||
|
free(settings->sftp_host_key);
|
||||||
free(settings->sftp_hostname);
|
free(settings->sftp_hostname);
|
||||||
free(settings->sftp_passphrase);
|
free(settings->sftp_passphrase);
|
||||||
free(settings->sftp_password);
|
free(settings->sftp_password);
|
||||||
|
@ -138,6 +138,11 @@ typedef struct guac_vnc_settings {
|
|||||||
*/
|
*/
|
||||||
char* sftp_hostname;
|
char* sftp_hostname;
|
||||||
|
|
||||||
|
/**
|
||||||
|
* The public SSH host key.
|
||||||
|
*/
|
||||||
|
char* sftp_host_key;
|
||||||
|
|
||||||
/**
|
/**
|
||||||
* The port of the SSH server to connect to for SFTP.
|
* The port of the SSH server to connect to for SFTP.
|
||||||
*/
|
*/
|
||||||
|
@ -261,7 +261,8 @@ void* guac_vnc_client_thread(void* data) {
|
|||||||
/* Attempt SSH connection */
|
/* Attempt SSH connection */
|
||||||
vnc_client->sftp_session =
|
vnc_client->sftp_session =
|
||||||
guac_common_ssh_create_session(client, settings->sftp_hostname,
|
guac_common_ssh_create_session(client, settings->sftp_hostname,
|
||||||
settings->sftp_port, vnc_client->sftp_user, settings->sftp_server_alive_interval);
|
settings->sftp_port, vnc_client->sftp_user, settings->sftp_server_alive_interval,
|
||||||
|
settings->sftp_host_key);
|
||||||
|
|
||||||
/* Fail if SSH connection does not succeed */
|
/* Fail if SSH connection does not succeed */
|
||||||
if (vnc_client->sftp_session == NULL) {
|
if (vnc_client->sftp_session == NULL) {
|
||||||
|
Loading…
Reference in New Issue
Block a user