/* * options.c - handle pre-connection options * * This file is part of the SSH Library * * Copyright (c) 2003-2008 by Aris Adamantiadis * Copyright (c) 2009-2013 by Andreas Schneider * * The SSH Library is free software; you can redistribute it and/or modify * it under the terms of the GNU Lesser General Public License as published by * the Free Software Foundation; either version 2.1 of the License, or (at your * option) any later version. * * The SSH Library is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public * License for more details. * * You should have received a copy of the GNU Lesser General Public License * along with the SSH Library; see the file COPYING. If not, write to * the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, * MA 02111-1307, USA. */ #include "config.h" #include #include #include #ifndef _WIN32 #include #else #include #endif #include #include "libssh/priv.h" #include "libssh/session.h" #include "libssh/misc.h" #include "libssh/options.h" #ifdef WITH_SERVER #include "libssh/server.h" #include "libssh/bind.h" #endif /** * @addtogroup libssh_session * @{ */ /** * @brief Duplicate the options of a session structure. * * If you make several sessions with the same options this is useful. You * cannot use twice the same option structure in ssh_session_connect. * * @param src The session to use to copy the options. * * @param dest A pointer to store the allocated session with duplicated * options. You have to free the memory. * * @returns 0 on sucess, -1 on error with errno set. * * @see ssh_session_connect() */ int ssh_options_copy(ssh_session src, ssh_session *dest) { ssh_session new; int i; if (src == NULL || dest == NULL) { return -1; } new = ssh_new(); if (new == NULL) { return -1; } if (src->opts.username) { new->opts.username = strdup(src->opts.username); if (new->opts.username == NULL) { ssh_free(new); return -1; } } if (src->opts.host) { new->opts.host = strdup(src->opts.host); if (new->opts.host == NULL) { ssh_free(new); return -1; } } if (src->opts.identity) { struct ssh_iterator *it; it = ssh_list_get_iterator(src->opts.identity); while (it) { char *id; int rc; id = strdup((char *) it->data); if (id == NULL) { ssh_free(new); return -1; } rc = ssh_list_append(new->opts.identity, id); if (rc < 0) { free(id); ssh_free(new); return -1; } it = it->next; } } if (src->opts.sshdir) { new->opts.sshdir = strdup(src->opts.sshdir); if (new->opts.sshdir == NULL) { ssh_free(new); return -1; } } if (src->opts.knownhosts) { new->opts.knownhosts = strdup(src->opts.knownhosts); if (new->opts.knownhosts == NULL) { ssh_free(new); return -1; } } for (i = 0; i < 10; i++) { if (src->opts.wanted_methods[i]) { new->opts.wanted_methods[i] = strdup(src->opts.wanted_methods[i]); if (new->opts.wanted_methods[i] == NULL) { ssh_free(new); return -1; } } } if (src->opts.ProxyCommand) { new->opts.ProxyCommand = strdup(src->opts.ProxyCommand); if (new->opts.ProxyCommand == NULL) { ssh_free(new); return -1; } } new->opts.fd = src->opts.fd; new->opts.port = src->opts.port; new->opts.timeout = src->opts.timeout; new->opts.timeout_usec = src->opts.timeout_usec; new->opts.ssh2 = src->opts.ssh2; new->opts.ssh1 = src->opts.ssh1; new->opts.compressionlevel = src->opts.compressionlevel; new->common.log_verbosity = src->common.log_verbosity; new->common.callbacks = src->common.callbacks; *dest = new; return 0; } int ssh_options_set_algo(ssh_session session, int algo, const char *list) { if (!verify_existing_algo(algo, list)) { ssh_set_error(session, SSH_REQUEST_DENIED, "Setting method: no algorithm for method \"%s\" (%s)\n", ssh_kex_get_description(algo), list); return -1; } SAFE_FREE(session->opts.wanted_methods[algo]); session->opts.wanted_methods[algo] = strdup(list); if (session->opts.wanted_methods[algo] == NULL) { ssh_set_error_oom(session); return -1; } return 0; } /** * @brief This function can set all possible ssh options. * * @param session An allocated SSH session structure. * * @param type The option type to set. This could be one of the * following: * * - SSH_OPTIONS_HOST: * The hostname or ip address to connect to (const char *). * * - SSH_OPTIONS_PORT: * The port to connect to (unsigned int). * * - SSH_OPTIONS_PORT_STR: * The port to connect to (const char *). * * - SSH_OPTIONS_FD: * The file descriptor to use (socket_t).\n * \n * If you wish to open the socket yourself for a reason * or another, set the file descriptor. Don't forget to * set the hostname as the hostname is used as a key in * the known_host mechanism. * * - SSH_OPTIONS_BINDADDR: * The address to bind the client to (const char *). * * - SSH_OPTIONS_USER: * The username for authentication (const char *).\n * \n * If the value is NULL, the username is set to the * default username. * * - SSH_OPTIONS_SSH_DIR: * Set the ssh directory (const char *,format string).\n * \n * If the value is NULL, the directory is set to the * default ssh directory.\n * \n * The ssh directory is used for files like known_hosts * and identity (private and public key). It may include * "%s" which will be replaced by the user home * directory. * * - SSH_OPTIONS_KNOWNHOSTS: * Set the known hosts file name (const char *,format string).\n * \n * If the value is NULL, the directory is set to the * default known hosts file, normally * ~/.ssh/known_hosts.\n * \n * The known hosts file is used to certify remote hosts * are genuine. It may include "%s" which will be * replaced by the user home directory. * * - SSH_OPTIONS_IDENTITY: * Set the identity file name (const char *,format string).\n * \n * By default identity, id_dsa and id_rsa are checked.\n * \n * The identity file used authenticate with public key. * It may include "%s" which will be replaced by the * user home directory. * * - SSH_OPTIONS_TIMEOUT: * Set a timeout for the connection in seconds (long). * * - SSH_OPTIONS_TIMEOUT_USEC: * Set a timeout for the connection in micro seconds * (long). * * - SSH_OPTIONS_SSH1: * Allow or deny the connection to SSH1 servers * (int, 0 is false). * * - SSH_OPTIONS_SSH2: * Allow or deny the connection to SSH2 servers * (int, 0 is false). * * - SSH_OPTIONS_LOG_VERBOSITY: * Set the session logging verbosity (int).\n * \n * The verbosity of the messages. Every log smaller or * equal to verbosity will be shown. * - SSH_LOG_NOLOG: No logging * - SSH_LOG_RARE: Rare conditions or warnings * - SSH_LOG_ENTRY: API-accessible entrypoints * - SSH_LOG_PACKET: Packet id and size * - SSH_LOG_FUNCTIONS: Function entering and leaving * * - SSH_OPTIONS_LOG_VERBOSITY_STR: * Set the session logging verbosity (const char *).\n * \n * The verbosity of the messages. Every log smaller or * equal to verbosity will be shown. * - SSH_LOG_NOLOG: No logging * - SSH_LOG_RARE: Rare conditions or warnings * - SSH_LOG_ENTRY: API-accessible entrypoints * - SSH_LOG_PACKET: Packet id and size * - SSH_LOG_FUNCTIONS: Function entering and leaving * \n * See the corresponding numbers in libssh.h. * * - SSH_OPTIONS_AUTH_CALLBACK: * Set a callback to use your own authentication function * (function pointer). * * - SSH_OPTIONS_AUTH_USERDATA: * Set the user data passed to the authentication * function (generic pointer). * * - SSH_OPTIONS_LOG_CALLBACK: * Set a callback to use your own logging function * (function pointer). * * - SSH_OPTIONS_LOG_USERDATA: * Set the user data passed to the logging function * (generic pointer). * * - SSH_OPTIONS_STATUS_CALLBACK: * Set a callback to show connection status in realtime * (function pointer).\n * \n * @code * fn(void *arg, float status) * @endcode * \n * During ssh_connect(), libssh will call the callback * with status from 0.0 to 1.0. * * - SSH_OPTIONS_STATUS_ARG: * Set the status argument which should be passed to the * status callback (generic pointer). * * - SSH_OPTIONS_CIPHERS_C_S: * Set the symmetric cipher client to server (const char *, * comma-separated list). * * - SSH_OPTIONS_CIPHERS_S_C: * Set the symmetric cipher server to client (const char *, * comma-separated list). * * - SSH_OPTIONS_KEY_EXCHANGE: * Set the key exchange method to be used (const char *, * comma-separated list). ex: * "ecdh-sha2-nistp256,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1" * * - SSH_OPTIONS_HOSTKEYS: * Set the preferred server host key types (const char *, * comma-separated list). ex: * "ssh-rsa,ssh-dss,ecdh-sha2-nistp256" * * - SSH_OPTIONS_COMPRESSION_C_S: * Set the compression to use for client to server * communication (const char *, "yes", "no" or a specific * algorithm name if needed ("zlib","zlib@openssh.com","none"). * * - SSH_OPTIONS_COMPRESSION_S_C: * Set the compression to use for server to client * communication (const char *, "yes", "no" or a specific * algorithm name if needed ("zlib","zlib@openssh.com","none"). * * - SSH_OPTIONS_COMPRESSION: * Set the compression to use for both directions * communication (const char *, "yes", "no" or a specific * algorithm name if needed ("zlib","zlib@openssh.com","none"). * * - SSH_OPTIONS_COMPRESSION_LEVEL: * Set the compression level to use for zlib functions. (int, * value from 1 to 9, 9 being the most efficient but slower). * * - SSH_OPTIONS_STRICTHOSTKEYCHECK: * Set the parameter StrictHostKeyChecking to avoid * asking about a fingerprint (int, 0 = false). * * - SSH_OPTIONS_PROXYCOMMAND: * Set the command to be executed in order to connect to * server (const char *). * * - SSH_OPTIONS_GSSAPI_SERVER_IDENTITY * Set it to specify the GSSAPI server identity that libssh * should expect when connecting to the server (const char *). * * - SSH_OPTIONS_GSSAPI_CLIENT_IDENTITY * Set it to specify the GSSAPI client identity that libssh * should expect when connecting to the server (const char *). * * - SSH_OPTIONS_GSSAPI_DELEGATE_CREDENTIALS * Set it to specify that GSSAPI should delegate credentials * to the server (int, 0 = false). * * @param value The value to set. This is a generic pointer and the * datatype which is used should be set according to the * type set. * * @return 0 on success, < 0 on error. */ int ssh_options_set(ssh_session session, enum ssh_options_e type, const void *value) { const char *v; char *p, *q; long int i; int rc; if (session == NULL) { return -1; } switch (type) { case SSH_OPTIONS_HOST: v = value; if (v == NULL || v[0] == '\0') { ssh_set_error_invalid(session); return -1; } else { q = strdup(value); if (q == NULL) { ssh_set_error_oom(session); return -1; } p = strchr(q, '@'); SAFE_FREE(session->opts.host); if (p) { *p = '\0'; session->opts.host = strdup(p + 1); if (session->opts.host == NULL) { SAFE_FREE(q); ssh_set_error_oom(session); return -1; } SAFE_FREE(session->opts.username); session->opts.username = strdup(q); SAFE_FREE(q); if (session->opts.username == NULL) { ssh_set_error_oom(session); return -1; } } else { session->opts.host = q; } } break; case SSH_OPTIONS_PORT: if (value == NULL) { ssh_set_error_invalid(session); return -1; } else { int *x = (int *) value; if (*x <= 0) { ssh_set_error_invalid(session); return -1; } session->opts.port = *x & 0xffff; } break; case SSH_OPTIONS_PORT_STR: v = value; if (v == NULL || v[0] == '\0') { ssh_set_error_invalid(session); return -1; } else { q = strdup(v); if (q == NULL) { ssh_set_error_oom(session); return -1; } i = strtol(q, &p, 10); if (q == p) { SAFE_FREE(q); } SAFE_FREE(q); if (i <= 0) { ssh_set_error_invalid(session); return -1; } session->opts.port = i & 0xffff; } break; case SSH_OPTIONS_FD: if (value == NULL) { session->opts.fd = SSH_INVALID_SOCKET; ssh_set_error_invalid(session); return -1; } else { socket_t *x = (socket_t *) value; if (*x < 0) { session->opts.fd = SSH_INVALID_SOCKET; ssh_set_error_invalid(session); return -1; } session->opts.fd = *x & 0xffff; } break; case SSH_OPTIONS_BINDADDR: v = value; if (v == NULL || v[0] == '\0') { ssh_set_error_invalid(session); return -1; } q = strdup(v); if (q == NULL) { return -1; } SAFE_FREE(session->opts.bindaddr); session->opts.bindaddr = q; break; case SSH_OPTIONS_USER: v = value; SAFE_FREE(session->opts.username); if (v == NULL) { q = ssh_get_local_username(); if (q == NULL) { ssh_set_error_oom(session); return -1; } session->opts.username = q; } else if (v[0] == '\0') { ssh_set_error_invalid(session); return -1; } else { /* username provided */ session->opts.username = strdup(value); if (session->opts.username == NULL) { ssh_set_error_oom(session); return -1; } } break; case SSH_OPTIONS_SSH_DIR: v = value; SAFE_FREE(session->opts.sshdir); if (v == NULL) { session->opts.sshdir = ssh_path_expand_tilde("~/.ssh"); if (session->opts.sshdir == NULL) { return -1; } } else if (v[0] == '\0') { ssh_set_error_invalid(session); return -1; } else { session->opts.sshdir = ssh_path_expand_tilde(v); if (session->opts.sshdir == NULL) { ssh_set_error_oom(session); return -1; } } break; case SSH_OPTIONS_IDENTITY: case SSH_OPTIONS_ADD_IDENTITY: v = value; if (v == NULL || v[0] == '\0') { ssh_set_error_invalid(session); return -1; } q = strdup(v); if (q == NULL) { return -1; } rc = ssh_list_prepend(session->opts.identity, q); if (rc < 0) { free(q); return -1; } break; case SSH_OPTIONS_KNOWNHOSTS: v = value; SAFE_FREE(session->opts.knownhosts); if (v == NULL) { session->opts.knownhosts = ssh_path_expand_escape(session, "%d/known_hosts"); if (session->opts.knownhosts == NULL) { ssh_set_error_oom(session); return -1; } } else if (v[0] == '\0') { ssh_set_error_invalid(session); return -1; } else { session->opts.knownhosts = strdup(v); if (session->opts.knownhosts == NULL) { ssh_set_error_oom(session); return -1; } } break; case SSH_OPTIONS_TIMEOUT: if (value == NULL) { ssh_set_error_invalid(session); return -1; } else { long *x = (long *) value; if (*x < 0) { ssh_set_error_invalid(session); return -1; } session->opts.timeout = *x & 0xffffffff; } break; case SSH_OPTIONS_TIMEOUT_USEC: if (value == NULL) { ssh_set_error_invalid(session); return -1; } else { long *x = (long *) value; if (*x < 0) { ssh_set_error_invalid(session); return -1; } session->opts.timeout_usec = *x & 0xffffffff; } break; case SSH_OPTIONS_SSH1: if (value == NULL) { ssh_set_error_invalid(session); return -1; } else { int *x = (int *) value; if (*x < 0) { ssh_set_error_invalid(session); return -1; } session->opts.ssh1 = *x; } break; case SSH_OPTIONS_SSH2: if (value == NULL) { ssh_set_error_invalid(session); return -1; } else { int *x = (int *) value; if (*x < 0) { ssh_set_error_invalid(session); return -1; } session->opts.ssh2 = *x & 0xffff; } break; case SSH_OPTIONS_LOG_VERBOSITY: if (value == NULL) { ssh_set_error_invalid(session); return -1; } else { int *x = (int *) value; if (*x < 0) { ssh_set_error_invalid(session); return -1; } session->common.log_verbosity = *x & 0xffff; ssh_set_log_level(*x & 0xffff); } break; case SSH_OPTIONS_LOG_VERBOSITY_STR: v = value; if (v == NULL || v[0] == '\0') { session->common.log_verbosity = 0; ssh_set_error_invalid(session); return -1; } else { q = strdup(v); if (q == NULL) { ssh_set_error_oom(session); return -1; } i = strtol(q, &p, 10); if (q == p) { SAFE_FREE(q); } SAFE_FREE(q); if (i < 0) { ssh_set_error_invalid(session); return -1; } session->common.log_verbosity = i & 0xffff; ssh_set_log_level(i & 0xffff); } break; case SSH_OPTIONS_CIPHERS_C_S: v = value; if (v == NULL || v[0] == '\0') { ssh_set_error_invalid(session); return -1; } else { if (ssh_options_set_algo(session, SSH_CRYPT_C_S, v) < 0) return -1; } break; case SSH_OPTIONS_CIPHERS_S_C: v = value; if (v == NULL || v[0] == '\0') { ssh_set_error_invalid(session); return -1; } else { if (ssh_options_set_algo(session, SSH_CRYPT_S_C, v) < 0) return -1; } break; case SSH_OPTIONS_KEY_EXCHANGE: v = value; if (v == NULL || v[0] == '\0') { ssh_set_error_invalid(session); return -1; } else { if (ssh_options_set_algo(session, SSH_KEX, v) < 0) return -1; } break; case SSH_OPTIONS_HOSTKEYS: v = value; if (v == NULL || v[0] == '\0') { ssh_set_error_invalid(session); return -1; } else { if (ssh_options_set_algo(session, SSH_HOSTKEYS, v) < 0) return -1; } break; case SSH_OPTIONS_HMAC_C_S: v = value; if (v == NULL || v[0] == '\0') { ssh_set_error_invalid(session); return -1; } else { if (ssh_options_set_algo(session, SSH_MAC_C_S, v) < 0) return -1; } break; case SSH_OPTIONS_HMAC_S_C: v = value; if (v == NULL || v[0] == '\0') { ssh_set_error_invalid(session); return -1; } else { if (ssh_options_set_algo(session, SSH_MAC_S_C, v) < 0) return -1; } break; case SSH_OPTIONS_COMPRESSION_C_S: v = value; if (v == NULL || v[0] == '\0') { ssh_set_error_invalid(session); return -1; } else { if (strcasecmp(value,"yes")==0){ if(ssh_options_set_algo(session,SSH_COMP_C_S,"zlib@openssh.com,zlib") < 0) return -1; } else if (strcasecmp(value,"no")==0){ if(ssh_options_set_algo(session,SSH_COMP_C_S,"none") < 0) return -1; } else { if (ssh_options_set_algo(session, SSH_COMP_C_S, v) < 0) return -1; } } break; case SSH_OPTIONS_COMPRESSION_S_C: v = value; if (v == NULL || v[0] == '\0') { ssh_set_error_invalid(session); return -1; } else { if (strcasecmp(value,"yes")==0){ if(ssh_options_set_algo(session,SSH_COMP_S_C,"zlib@openssh.com,zlib") < 0) return -1; } else if (strcasecmp(value,"no")==0){ if(ssh_options_set_algo(session,SSH_COMP_S_C,"none") < 0) return -1; } else { if (ssh_options_set_algo(session, SSH_COMP_S_C, v) < 0) return -1; } } break; case SSH_OPTIONS_COMPRESSION: v = value; if (v == NULL || v[0] == '\0') { ssh_set_error_invalid(session); return -1; } if(ssh_options_set(session,SSH_OPTIONS_COMPRESSION_C_S, v) < 0) return -1; if(ssh_options_set(session,SSH_OPTIONS_COMPRESSION_S_C, v) < 0) return -1; break; case SSH_OPTIONS_COMPRESSION_LEVEL: if (value == NULL) { ssh_set_error_invalid(session); return -1; } else { int *x = (int *)value; if (*x < 1 || *x > 9) { ssh_set_error_invalid(session); return -1; } session->opts.compressionlevel = *x & 0xff; } break; case SSH_OPTIONS_STRICTHOSTKEYCHECK: if (value == NULL) { ssh_set_error_invalid(session); return -1; } else { int *x = (int *) value; session->opts.StrictHostKeyChecking = (*x & 0xff) > 0 ? 1 : 0; } session->opts.StrictHostKeyChecking = *(int*)value; break; case SSH_OPTIONS_PROXYCOMMAND: v = value; if (v == NULL || v[0] == '\0') { ssh_set_error_invalid(session); return -1; } else { SAFE_FREE(session->opts.ProxyCommand); /* Setting the command to 'none' disables this option. */ rc = strcasecmp(v, "none"); if (rc != 0) { q = strdup(v); if (q == NULL) { return -1; } session->opts.ProxyCommand = q; } } break; case SSH_OPTIONS_GSSAPI_SERVER_IDENTITY: v = value; if (v == NULL || v[0] == '\0') { ssh_set_error_invalid(session); return -1; } else { SAFE_FREE(session->opts.gss_server_identity); session->opts.gss_server_identity = strdup(v); if (session->opts.gss_server_identity == NULL) { ssh_set_error_oom(session); return -1; } } break; case SSH_OPTIONS_GSSAPI_CLIENT_IDENTITY: v = value; if (v == NULL || v[0] == '\0') { ssh_set_error_invalid(session); return -1; } else { SAFE_FREE(session->opts.gss_client_identity); session->opts.gss_client_identity = strdup(v); if (session->opts.gss_client_identity == NULL) { ssh_set_error_oom(session); return -1; } } break; case SSH_OPTIONS_GSSAPI_DELEGATE_CREDENTIALS: if (value == NULL) { ssh_set_error_invalid(session); return -1; } else { int x = *(int *)value; session->opts.gss_delegate_creds = (x & 0xff); } break; default: ssh_set_error(session, SSH_REQUEST_DENIED, "Unknown ssh option %d", type); return -1; break; } return 0; } /** * @brief This function can get ssh the ssh port. It must only be used on * a valid ssh session. This function is useful when the session * options have been automatically inferred from the environment * or configuration files and one * * @param session An allocated SSH session structure. * * @param port_target An unsigned integer into which the * port will be set from the ssh session. * * @return 0 on success, < 0 on error. * */ int ssh_options_get_port(ssh_session session, unsigned int* port_target) { if (session == NULL) { return -1; } if (session->opts.port == 0) { *port_target = 22; return 0; } *port_target = session->opts.port; return 0; } /** * @brief This function can get ssh options, it does not support all options provided for * ssh options set, but mostly those which a user-space program may care about having * trusted the ssh driver to infer these values from underlaying configuration files. * It operates only on those SSH_OPTIONS_* which return char*. If you wish to receive * the port then please use ssh_options_get_port() which returns an unsigned int. * * @param session An allocated SSH session structure. * * @param type The option type to get. This could be one of the * following: * * - SSH_OPTIONS_HOST: * The hostname or ip address to connect to (const char *). * * - SSH_OPTIONS_USER: * The username for authentication (const char *).\n * \n when not explicitly set this will be inferred from the * ~/.ssh/config file. * * - SSH_OPTIONS_IDENTITY: * Set the identity file name (const char *,format string).\n * \n * By default identity, id_dsa and id_rsa are checked.\n * \n * The identity file used authenticate with public key. * It may include "%s" which will be replaced by the * user home directory. * * - SSH_OPTIONS_PROXYCOMMAND: * Get the proxycommand necessary to log into the * remote host. When not explicitly set, it will be read * from the ~/.ssh/config file. * * @param value The value to get into. As a char**, space will be * allocated by the function for the value, it is * your responsibility to free the memory using * ssh_string_free_char(). * * @return SSH_OK on success, SSH_ERROR on error. */ int ssh_options_get(ssh_session session, enum ssh_options_e type, char** value) { char* src = NULL; if (session == NULL) { return SSH_ERROR; } if (value == NULL) { ssh_set_error_invalid(session); return SSH_ERROR; } switch(type) { case SSH_OPTIONS_HOST: { src = session->opts.host; break; } case SSH_OPTIONS_USER: { src = session->opts.username; break; } case SSH_OPTIONS_IDENTITY: { struct ssh_iterator *it = ssh_list_get_iterator(session->opts.identity); if (it == NULL) { return SSH_ERROR; } src = ssh_iterator_value(char *, it); break; } case SSH_OPTIONS_PROXYCOMMAND: { src = session->opts.ProxyCommand; break; } default: ssh_set_error(session, SSH_REQUEST_DENIED, "Unknown ssh option %d", type); return SSH_ERROR; break; } if (src == NULL) { return SSH_ERROR; } *value = strdup(src); if (*value == NULL) { ssh_set_error_oom(session); return SSH_ERROR; } return SSH_OK; } /** * @brief Parse command line arguments. * * This is a helper for your application to generate the appropriate * options from the command line arguments.\n * The argv array and argc value are changed so that the parsed * arguments wont appear anymore in them.\n * The single arguments (without switches) are not parsed. thus, * myssh -l user localhost\n * The command wont set the hostname value of options to localhost. * * @param session The session to configure. * * @param argcptr The pointer to the argument count. * * @param argv The arguments list pointer. * * @returns 0 on success, < 0 on error. * * @see ssh_session_new() */ int ssh_options_getopt(ssh_session session, int *argcptr, char **argv) { char *user = NULL; char *cipher = NULL; char *identity = NULL; char *port = NULL; char **save = NULL; char **tmp = NULL; int i = 0; int argc = *argcptr; int debuglevel = 0; int usersa = 0; int usedss = 0; int compress = 0; int cont = 1; int current = 0; #ifdef WITH_SSH1 int ssh1 = 1; #else int ssh1 = 0; #endif int ssh2 = 1; #ifdef _MSC_VER /* Not supported with a Microsoft compiler */ return -1; #else int saveoptind = optind; /* need to save 'em */ int saveopterr = opterr; opterr = 0; /* shut up getopt */ while(cont && ((i = getopt(argc, argv, "c:i:Cl:p:vb:rd12")) != -1)) { switch(i) { case 'l': user = optarg; break; case 'p': port = optarg; break; case 'v': debuglevel++; break; case 'r': usersa++; break; case 'd': usedss++; break; case 'c': cipher = optarg; break; case 'i': identity = optarg; break; case 'C': compress++; break; case '2': ssh2 = 1; ssh1 = 0; break; case '1': ssh2 = 0; ssh1 = 1; break; default: { char opt[3]="- "; opt[1] = optopt; tmp = realloc(save, (current + 1) * sizeof(char*)); if (tmp == NULL) { SAFE_FREE(save); ssh_set_error_oom(session); return -1; } save = tmp; save[current] = strdup(opt); if (save[current] == NULL) { SAFE_FREE(save); ssh_set_error_oom(session); return -1; } current++; if (optarg) { save[current++] = argv[optind + 1]; } } } /* switch */ } /* while */ opterr = saveopterr; tmp = realloc(save, (current + (argc - optind)) * sizeof(char*)); if (tmp == NULL) { SAFE_FREE(save); ssh_set_error_oom(session); return -1; } save = tmp; while (optind < argc) { tmp = realloc(save, (current + 1) * sizeof(char*)); if (tmp == NULL) { SAFE_FREE(save); ssh_set_error_oom(session); return -1; } save = tmp; save[current] = argv[optind]; current++; optind++; } if (usersa && usedss) { ssh_set_error(session, SSH_FATAL, "Either RSA or DSS must be chosen"); cont = 0; } ssh_set_log_level(debuglevel); optind = saveoptind; if(!cont) { SAFE_FREE(save); return -1; } /* first recopy the save vector into the original's */ for (i = 0; i < current; i++) { /* don't erase argv[0] */ argv[ i + 1] = save[i]; } argv[current + 1] = NULL; *argcptr = current + 1; SAFE_FREE(save); /* set a new option struct */ if (compress) { if (ssh_options_set(session, SSH_OPTIONS_COMPRESSION, "yes") < 0) { cont = 0; } } if (cont && cipher) { if (ssh_options_set(session, SSH_OPTIONS_CIPHERS_C_S, cipher) < 0) { cont = 0; } if (cont && ssh_options_set(session, SSH_OPTIONS_CIPHERS_S_C, cipher) < 0) { cont = 0; } } if (cont && user) { if (ssh_options_set(session, SSH_OPTIONS_USER, user) < 0) { cont = 0; } } if (cont && identity) { if (ssh_options_set(session, SSH_OPTIONS_IDENTITY, identity) < 0) { cont = 0; } } ssh_options_set(session, SSH_OPTIONS_PORT_STR, port); ssh_options_set(session, SSH_OPTIONS_SSH1, &ssh1); ssh_options_set(session, SSH_OPTIONS_SSH2, &ssh2); if (!cont) { return SSH_ERROR; } return SSH_OK; #endif } /** * @brief Parse the ssh config file. * * This should be the last call of all options, it may overwrite options which * are already set. It requires that the host name is already set with * ssh_options_set_host(). * * @param session SSH session handle * * @param filename The options file to use, if NULL the default * ~/.ssh/config will be used. * * @return 0 on success, < 0 on error. * * @see ssh_options_set_host() */ int ssh_options_parse_config(ssh_session session, const char *filename) { char *expanded_filename; int r; if (session == NULL) { return -1; } if (session->opts.host == NULL) { ssh_set_error_invalid(session); return -1; } if (session->opts.sshdir == NULL) { r = ssh_options_set(session, SSH_OPTIONS_SSH_DIR, NULL); if (r < 0) { ssh_set_error_oom(session); return -1; } } /* set default filename */ if (filename == NULL) { expanded_filename = ssh_path_expand_escape(session, "%d/config"); } else { expanded_filename = ssh_path_expand_escape(session, filename); } if (expanded_filename == NULL) { return -1; } r = ssh_config_parse_file(session, expanded_filename); if (r < 0) { goto out; } if (filename == NULL) { r = ssh_config_parse_file(session, "/etc/ssh/ssh_config"); } out: free(expanded_filename); return r; } int ssh_options_apply(ssh_session session) { struct ssh_iterator *it; char *tmp; int rc; if (session->opts.sshdir == NULL) { rc = ssh_options_set(session, SSH_OPTIONS_SSH_DIR, NULL); if (rc < 0) { return -1; } } if (session->opts.username == NULL) { rc = ssh_options_set(session, SSH_OPTIONS_USER, NULL); if (rc < 0) { return -1; } } if (session->opts.knownhosts == NULL) { tmp = ssh_path_expand_escape(session, "%d/known_hosts"); } else { tmp = ssh_path_expand_escape(session, session->opts.knownhosts); } if (tmp == NULL) { return -1; } free(session->opts.knownhosts); session->opts.knownhosts = tmp; if (session->opts.ProxyCommand != NULL) { tmp = ssh_path_expand_escape(session, session->opts.ProxyCommand); if (tmp == NULL) { return -1; } free(session->opts.ProxyCommand); session->opts.ProxyCommand = tmp; } for (it = ssh_list_get_iterator(session->opts.identity); it != NULL; it = it->next) { char *id = (char *) it->data; tmp = ssh_path_expand_escape(session, id); if (tmp == NULL) { return -1; } free(id); it->data = tmp; } return 0; } /** @} */ #ifdef WITH_SERVER /** * @addtogroup libssh_server * @{ */ static int ssh_bind_set_key(ssh_bind sshbind, char **key_loc, const void *value) { if (value == NULL) { ssh_set_error_invalid(sshbind); return -1; } else { SAFE_FREE(*key_loc); *key_loc = strdup(value); if (*key_loc == NULL) { ssh_set_error_oom(sshbind); return -1; } } return 0; } /** * @brief Set options for an SSH server bind. * * @param sshbind The ssh server bind to configure. * * @param type The option type to set. This should be one of the * following: * * - SSH_BIND_OPTIONS_HOSTKEY: * Set the path to an ssh host key, regardless * of type. Only one key from per key type * (RSA, DSA, ECDSA) is allowed in an ssh_bind * at a time, and later calls to this function * with this option for the same key type will * override prior calls (const char *). * * - SSH_BIND_OPTIONS_BINDADDR: * Set the IP address to bind (const char *). * * - SSH_BIND_OPTIONS_BINDPORT: * Set the port to bind (unsigned int *). * * - SSH_BIND_OPTIONS_BINDPORT_STR: * Set the port to bind (const char *). * * - SSH_BIND_OPTIONS_LOG_VERBOSITY: * Set the session logging verbosity (int *). * The logging verbosity should have one of the * following values, which are listed in order * of increasing verbosity. Every log message * with verbosity less than or equal to the * logging verbosity will be shown. * - SSH_LOG_NOLOG: No logging * - SSH_LOG_WARNING: Only warnings * - SSH_LOG_PROTOCOL: High level protocol information * - SSH_LOG_PACKET: Lower level protocol infomations, packet level * - SSH_LOG_FUNCTIONS: Every function path * * - SSH_BIND_OPTIONS_LOG_VERBOSITY_STR: * Set the session logging verbosity via a * string that will be converted to a numerical * value (e.g. "3") and interpreted according * to the values of * SSH_BIND_OPTIONS_LOG_VERBOSITY above (const * char *). * * - SSH_BIND_OPTIONS_DSAKEY: * Set the path to the ssh host dsa key, SSHv2 * only (const char *). * * - SSH_BIND_OPTIONS_RSAKEY: * Set the path to the ssh host rsa key, SSHv2 * only (const char *). * * - SSH_BIND_OPTIONS_ECDSAKEY: * Set the path to the ssh host ecdsa key, * SSHv2 only (const char *). * * - SSH_BIND_OPTIONS_BANNER: * Set the server banner sent to clients (const char *). * * @param value The value to set. This is a generic pointer and the * datatype which should be used is described at the * corresponding value of type above. * * @return 0 on success, < 0 on error, invalid option, or parameter. */ int ssh_bind_options_set(ssh_bind sshbind, enum ssh_bind_options_e type, const void *value) { char *p, *q; int i, rc; if (sshbind == NULL) { return -1; } switch (type) { case SSH_BIND_OPTIONS_HOSTKEY: if (value == NULL) { ssh_set_error_invalid(sshbind); return -1; } else { int key_type; ssh_key key; ssh_key *bind_key_loc = NULL; char **bind_key_path_loc; rc = ssh_pki_import_privkey_file(value, NULL, NULL, NULL, &key); if (rc != SSH_OK) { return -1; } key_type = ssh_key_type(key); switch (key_type) { case SSH_KEYTYPE_DSS: bind_key_loc = &sshbind->dsa; bind_key_path_loc = &sshbind->dsakey; break; case SSH_KEYTYPE_ECDSA: #ifdef HAVE_ECC bind_key_loc = &sshbind->ecdsa; bind_key_path_loc = &sshbind->ecdsakey; #else ssh_set_error(sshbind, SSH_FATAL, "ECDSA key used and libssh compiled " "without ECDSA support"); #endif break; case SSH_KEYTYPE_RSA: case SSH_KEYTYPE_RSA1: bind_key_loc = &sshbind->rsa; bind_key_path_loc = &sshbind->rsakey; break; case SSH_KEYTYPE_ED25519: bind_key_loc = &sshbind->ed25519; bind_key_path_loc = &sshbind->ed25519key; break; default: ssh_set_error(sshbind, SSH_FATAL, "Unsupported key type %d", key_type); } if (bind_key_loc == NULL) { ssh_key_free(key); return -1; } /* Set the location of the key on disk even though we don't need it in case some other function wants it */ rc = ssh_bind_set_key(sshbind, bind_key_path_loc, value); if (rc < 0) { ssh_key_free(key); return -1; } ssh_key_free(*bind_key_loc); *bind_key_loc = key; } break; case SSH_BIND_OPTIONS_BINDADDR: if (value == NULL) { ssh_set_error_invalid(sshbind); return -1; } else { SAFE_FREE(sshbind->bindaddr); sshbind->bindaddr = strdup(value); if (sshbind->bindaddr == NULL) { ssh_set_error_oom(sshbind); return -1; } } break; case SSH_BIND_OPTIONS_BINDPORT: if (value == NULL) { ssh_set_error_invalid(sshbind); return -1; } else { int *x = (int *) value; sshbind->bindport = *x & 0xffff; } break; case SSH_BIND_OPTIONS_BINDPORT_STR: if (value == NULL) { sshbind->bindport = 22 & 0xffff; } else { q = strdup(value); if (q == NULL) { ssh_set_error_oom(sshbind); return -1; } i = strtol(q, &p, 10); if (q == p) { SAFE_FREE(q); } SAFE_FREE(q); sshbind->bindport = i & 0xffff; } break; case SSH_BIND_OPTIONS_LOG_VERBOSITY: if (value == NULL) { ssh_set_error_invalid(sshbind); return -1; } else { int *x = (int *) value; ssh_set_log_level(*x & 0xffff); } break; case SSH_BIND_OPTIONS_LOG_VERBOSITY_STR: if (value == NULL) { ssh_set_log_level(0); } else { q = strdup(value); if (q == NULL) { ssh_set_error_oom(sshbind); return -1; } i = strtol(q, &p, 10); if (q == p) { SAFE_FREE(q); } SAFE_FREE(q); ssh_set_log_level(i & 0xffff); } break; case SSH_BIND_OPTIONS_DSAKEY: rc = ssh_bind_set_key(sshbind, &sshbind->dsakey, value); if (rc < 0) { return -1; } break; case SSH_BIND_OPTIONS_RSAKEY: rc = ssh_bind_set_key(sshbind, &sshbind->rsakey, value); if (rc < 0) { return -1; } break; case SSH_BIND_OPTIONS_ECDSAKEY: rc = ssh_bind_set_key(sshbind, &sshbind->ecdsakey, value); if (rc < 0) { return -1; } break; case SSH_BIND_OPTIONS_BANNER: if (value == NULL) { ssh_set_error_invalid(sshbind); return -1; } else { SAFE_FREE(sshbind->banner); sshbind->banner = strdup(value); if (sshbind->banner == NULL) { ssh_set_error_oom(sshbind); return -1; } } break; default: ssh_set_error(sshbind, SSH_REQUEST_DENIED, "Unknown ssh option %d", type); return -1; break; } return 0; } #endif /** @} */ /* vim: set ts=4 sw=4 et cindent: */