Mercurial > dropbear
view svr-runopts.c @ 988:6c0fb5428aaa
Enable sha2 HMACs by default, they're required for ecdsa already
author | Matt Johnston <matt@ucc.asn.au> |
---|---|
date | Tue, 13 Jan 2015 20:55:04 +0800 |
parents | 964d41e3aeb2 |
children | 47643024fc90 |
line wrap: on
line source
/* * Dropbear - a SSH2 server * * Copyright (c) 2002,2003 Matt Johnston * All rights reserved. * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE * SOFTWARE. */ #include "includes.h" #include "runopts.h" #include "signkey.h" #include "buffer.h" #include "dbutil.h" #include "algo.h" #include "ecdsa.h" svr_runopts svr_opts; /* GLOBAL */ static void printhelp(const char * progname); static void addportandaddress(char* spec); static void loadhostkey(const char *keyfile, int fatal_duplicate); static void addhostkey(const char *keyfile); static void printhelp(const char * progname) { fprintf(stderr, "Dropbear server v%s https://matt.ucc.asn.au/dropbear/dropbear.html\n" "Usage: %s [options]\n" "-b bannerfile Display the contents of bannerfile" " before user login\n" " (default: none)\n" "-r keyfile Specify hostkeys (repeatable)\n" " defaults: \n" #ifdef DROPBEAR_DSS " dss %s\n" #endif #ifdef DROPBEAR_RSA " rsa %s\n" #endif #ifdef DROPBEAR_ECDSA " ecdsa %s\n" #endif #ifdef DROPBEAR_DELAY_HOSTKEY "-R Create hostkeys as required\n" #endif "-F Don't fork into background\n" #ifdef DISABLE_SYSLOG "(Syslog support not compiled in, using stderr)\n" #else "-E Log to stderr rather than syslog\n" #endif #ifdef DO_MOTD "-m Don't display the motd on login\n" #endif "-w Disallow root logins\n" #if defined(ENABLE_SVR_PASSWORD_AUTH) || defined(ENABLE_SVR_PAM_AUTH) "-s Disable password logins\n" "-g Disable password logins for root\n" "-B Allow blank password logins\n" #endif #ifdef ENABLE_SVR_LOCALTCPFWD "-j Disable local port forwarding\n" #endif #ifdef ENABLE_SVR_REMOTETCPFWD "-k Disable remote port forwarding\n" "-a Allow connections to forwarded ports from any host\n" #endif "-p [address:]port\n" " Listen on specified tcp port (and optionally address),\n" " up to %d can be specified\n" " (default port is %s if none specified)\n" "-P PidFile Create pid file PidFile\n" " (default %s)\n" #ifdef INETD_MODE "-i Start for inetd\n" #endif "-W <receive_window_buffer> (default %d, larger may be faster, max 1MB)\n" "-K <keepalive> (0 is never, default %d, in seconds)\n" "-I <idle_timeout> (0 is never, default %d, in seconds)\n" "-V Version\n" #ifdef DEBUG_TRACE "-v verbose (compiled with DEBUG_TRACE)\n" #endif ,DROPBEAR_VERSION, progname, #ifdef DROPBEAR_DSS DSS_PRIV_FILENAME, #endif #ifdef DROPBEAR_RSA RSA_PRIV_FILENAME, #endif #ifdef DROPBEAR_ECDSA ECDSA_PRIV_FILENAME, #endif DROPBEAR_MAX_PORTS, DROPBEAR_DEFPORT, DROPBEAR_PIDFILE, DEFAULT_RECV_WINDOW, DEFAULT_KEEPALIVE, DEFAULT_IDLE_TIMEOUT); } void svr_getopts(int argc, char ** argv) { unsigned int i; char ** next = 0; int nextisport = 0; char* recv_window_arg = NULL; char* keepalive_arg = NULL; char* idle_timeout_arg = NULL; char* keyfile = NULL; /* see printhelp() for options */ svr_opts.bannerfile = NULL; svr_opts.banner = NULL; svr_opts.forkbg = 1; svr_opts.norootlogin = 0; svr_opts.noauthpass = 0; svr_opts.norootpass = 0; svr_opts.allowblankpass = 0; svr_opts.inetdmode = 0; svr_opts.portcount = 0; svr_opts.hostkey = NULL; svr_opts.delay_hostkey = 0; svr_opts.pidfile = DROPBEAR_PIDFILE; #ifdef ENABLE_SVR_LOCALTCPFWD svr_opts.nolocaltcp = 0; #endif #ifdef ENABLE_SVR_REMOTETCPFWD svr_opts.noremotetcp = 0; #endif #ifndef DISABLE_ZLIB opts.enable_compress = 1; #endif /* not yet opts.ipv4 = 1; opts.ipv6 = 1; */ #ifdef DO_MOTD svr_opts.domotd = 1; #endif #ifndef DISABLE_SYSLOG svr_opts.usingsyslog = 1; #endif opts.recv_window = DEFAULT_RECV_WINDOW; opts.keepalive_secs = DEFAULT_KEEPALIVE; opts.idle_timeout_secs = DEFAULT_IDLE_TIMEOUT; #ifdef ENABLE_SVR_REMOTETCPFWD opts.listen_fwd_all = 0; #endif for (i = 1; i < (unsigned int)argc; i++) { if (nextisport) { addportandaddress(argv[i]); nextisport = 0; continue; } if (next) { *next = argv[i]; if (*next == NULL) { dropbear_exit("Invalid null argument"); } next = 0x00; if (keyfile) { addhostkey(keyfile); keyfile = NULL; } continue; } if (argv[i][0] == '-') { switch (argv[i][1]) { case 'b': next = &svr_opts.bannerfile; break; case 'd': case 'r': next = &keyfile; break; case 'R': svr_opts.delay_hostkey = 1; break; case 'F': svr_opts.forkbg = 0; break; #ifndef DISABLE_SYSLOG case 'E': svr_opts.usingsyslog = 0; break; #endif #ifdef ENABLE_SVR_LOCALTCPFWD case 'j': svr_opts.nolocaltcp = 1; break; #endif #ifdef ENABLE_SVR_REMOTETCPFWD case 'k': svr_opts.noremotetcp = 1; break; case 'a': opts.listen_fwd_all = 1; break; #endif #ifdef INETD_MODE case 'i': svr_opts.inetdmode = 1; break; #endif case 'p': nextisport = 1; break; case 'P': next = &svr_opts.pidfile; break; #ifdef DO_MOTD /* motd is displayed by default, -m turns it off */ case 'm': svr_opts.domotd = 0; break; #endif case 'w': svr_opts.norootlogin = 1; break; case 'W': next = &recv_window_arg; break; case 'K': next = &keepalive_arg; break; case 'I': next = &idle_timeout_arg; break; #if defined(ENABLE_SVR_PASSWORD_AUTH) || defined(ENABLE_SVR_PAM_AUTH) case 's': svr_opts.noauthpass = 1; break; case 'g': svr_opts.norootpass = 1; break; case 'B': svr_opts.allowblankpass = 1; break; #endif case 'h': printhelp(argv[0]); exit(EXIT_SUCCESS); break; case 'u': /* backwards compatibility with old urandom option */ break; #ifdef DEBUG_TRACE case 'v': debug_trace = 1; break; #endif case 'V': print_version(); exit(EXIT_SUCCESS); break; default: fprintf(stderr, "Unknown argument %s\n", argv[i]); printhelp(argv[0]); exit(EXIT_FAILURE); break; } } } /* Set up listening ports */ if (svr_opts.portcount == 0) { svr_opts.ports[0] = m_strdup(DROPBEAR_DEFPORT); svr_opts.addresses[0] = m_strdup(DROPBEAR_DEFADDRESS); svr_opts.portcount = 1; } if (svr_opts.bannerfile) { struct stat buf; if (stat(svr_opts.bannerfile, &buf) != 0) { dropbear_exit("Error opening banner file '%s'", svr_opts.bannerfile); } if (buf.st_size > MAX_BANNER_SIZE) { dropbear_exit("Banner file too large, max is %d bytes", MAX_BANNER_SIZE); } svr_opts.banner = buf_new(buf.st_size); if (buf_readfile(svr_opts.banner, svr_opts.bannerfile)!=DROPBEAR_SUCCESS) { dropbear_exit("Error reading banner file '%s'", svr_opts.bannerfile); } buf_setpos(svr_opts.banner, 0); } if (recv_window_arg) { opts.recv_window = atol(recv_window_arg); if (opts.recv_window == 0 || opts.recv_window > MAX_RECV_WINDOW) { dropbear_exit("Bad recv window '%s'", recv_window_arg); } } if (keepalive_arg) { unsigned int val; if (m_str_to_uint(keepalive_arg, &val) == DROPBEAR_FAILURE) { dropbear_exit("Bad keepalive '%s'", keepalive_arg); } opts.keepalive_secs = val; } if (idle_timeout_arg) { unsigned int val; if (m_str_to_uint(idle_timeout_arg, &val) == DROPBEAR_FAILURE) { dropbear_exit("Bad idle_timeout '%s'", idle_timeout_arg); } opts.idle_timeout_secs = val; } } static void addportandaddress(char* spec) { char *myspec = NULL; if (svr_opts.portcount < DROPBEAR_MAX_PORTS) { /* We don't free it, it becomes part of the runopt state */ myspec = m_strdup(spec); if (myspec[0] == '[') { myspec++; svr_opts.ports[svr_opts.portcount] = strchr(myspec, ']'); if (svr_opts.ports[svr_opts.portcount] == NULL) { /* Unmatched [ -> exit */ dropbear_exit("Bad listen address"); } svr_opts.ports[svr_opts.portcount][0] = '\0'; svr_opts.ports[svr_opts.portcount]++; if (svr_opts.ports[svr_opts.portcount][0] != ':') { /* Missing port -> exit */ dropbear_exit("Missing port"); } } else { /* search for ':', that separates address and port */ svr_opts.ports[svr_opts.portcount] = strrchr(myspec, ':'); } if (svr_opts.ports[svr_opts.portcount] == NULL) { /* no ':' -> the whole string specifies just a port */ svr_opts.ports[svr_opts.portcount] = myspec; } else { /* Split the address/port */ svr_opts.ports[svr_opts.portcount][0] = '\0'; svr_opts.ports[svr_opts.portcount]++; svr_opts.addresses[svr_opts.portcount] = myspec; } if (svr_opts.addresses[svr_opts.portcount] == NULL) { /* no address given -> fill in the default address */ svr_opts.addresses[svr_opts.portcount] = m_strdup(DROPBEAR_DEFADDRESS); } if (svr_opts.ports[svr_opts.portcount][0] == '\0') { /* empty port -> exit */ dropbear_exit("Bad port"); } svr_opts.portcount++; } } static void disablekey(int type) { int i; TRACE(("Disabling key type %d", type)) for (i = 0; sshhostkey[i].name != NULL; i++) { if (sshhostkey[i].val == type) { sshhostkey[i].usable = 0; break; } } } static void loadhostkey_helper(const char *name, void** src, void** dst, int fatal_duplicate) { if (*dst) { if (fatal_duplicate) { dropbear_exit("Only one %s key can be specified", name); } } else { *dst = *src; *src = NULL; } } /* Must be called after syslog/etc is working */ static void loadhostkey(const char *keyfile, int fatal_duplicate) { sign_key * read_key = new_sign_key(); enum signkey_type type = DROPBEAR_SIGNKEY_ANY; if (readhostkey(keyfile, read_key, &type) == DROPBEAR_FAILURE) { if (!svr_opts.delay_hostkey) { dropbear_log(LOG_WARNING, "Failed loading %s", keyfile); } } #ifdef DROPBEAR_RSA if (type == DROPBEAR_SIGNKEY_RSA) { loadhostkey_helper("RSA", (void**)&read_key->rsakey, (void**)&svr_opts.hostkey->rsakey, fatal_duplicate); } #endif #ifdef DROPBEAR_DSS if (type == DROPBEAR_SIGNKEY_DSS) { loadhostkey_helper("DSS", (void**)&read_key->dsskey, (void**)&svr_opts.hostkey->dsskey, fatal_duplicate); } #endif #ifdef DROPBEAR_ECDSA #ifdef DROPBEAR_ECC_256 if (type == DROPBEAR_SIGNKEY_ECDSA_NISTP256) { loadhostkey_helper("ECDSA256", (void**)&read_key->ecckey256, (void**)&svr_opts.hostkey->ecckey256, fatal_duplicate); } #endif #ifdef DROPBEAR_ECC_384 if (type == DROPBEAR_SIGNKEY_ECDSA_NISTP384) { loadhostkey_helper("ECDSA384", (void**)&read_key->ecckey384, (void**)&svr_opts.hostkey->ecckey384, fatal_duplicate); } #endif #ifdef DROPBEAR_ECC_521 if (type == DROPBEAR_SIGNKEY_ECDSA_NISTP521) { loadhostkey_helper("ECDSA521", (void**)&read_key->ecckey521, (void**)&svr_opts.hostkey->ecckey521, fatal_duplicate); } #endif #endif /* DROPBEAR_ECDSA */ sign_key_free(read_key); TRACE(("leave loadhostkey")) } static void addhostkey(const char *keyfile) { if (svr_opts.num_hostkey_files >= MAX_HOSTKEYS) { dropbear_exit("Too many hostkeys"); } svr_opts.hostkey_files[svr_opts.num_hostkey_files] = m_strdup(keyfile); svr_opts.num_hostkey_files++; } void load_all_hostkeys() { int i; int disable_unset_keys = 1; int any_keys = 0; svr_opts.hostkey = new_sign_key(); for (i = 0; i < svr_opts.num_hostkey_files; i++) { char *hostkey_file = svr_opts.hostkey_files[i]; loadhostkey(hostkey_file, 1); m_free(hostkey_file); } #ifdef DROPBEAR_RSA loadhostkey(RSA_PRIV_FILENAME, 0); #endif #ifdef DROPBEAR_DSS loadhostkey(DSS_PRIV_FILENAME, 0); #endif #ifdef DROPBEAR_ECDSA loadhostkey(ECDSA_PRIV_FILENAME, 0); #endif #ifdef DROPBEAR_DELAY_HOSTKEY if (svr_opts.delay_hostkey) { disable_unset_keys = 0; } #endif #ifdef DROPBEAR_RSA if (disable_unset_keys && !svr_opts.hostkey->rsakey) { disablekey(DROPBEAR_SIGNKEY_RSA); } else { any_keys = 1; } #endif #ifdef DROPBEAR_DSS if (disable_unset_keys && !svr_opts.hostkey->dsskey) { disablekey(DROPBEAR_SIGNKEY_DSS); } else { any_keys = 1; } #endif #ifdef DROPBEAR_ECDSA #ifdef DROPBEAR_ECC_256 if ((disable_unset_keys || ECDSA_DEFAULT_SIZE != 256) && !svr_opts.hostkey->ecckey256) { disablekey(DROPBEAR_SIGNKEY_ECDSA_NISTP256); } else { any_keys = 1; } #endif #ifdef DROPBEAR_ECC_384 if ((disable_unset_keys || ECDSA_DEFAULT_SIZE != 384) && !svr_opts.hostkey->ecckey384) { disablekey(DROPBEAR_SIGNKEY_ECDSA_NISTP384); } else { any_keys = 1; } #endif #ifdef DROPBEAR_ECC_521 if ((disable_unset_keys || ECDSA_DEFAULT_SIZE != 521) && !svr_opts.hostkey->ecckey521) { disablekey(DROPBEAR_SIGNKEY_ECDSA_NISTP521); } else { any_keys = 1; } #endif #endif /* DROPBEAR_ECDSA */ if (!any_keys) { dropbear_exit("No hostkeys available"); } }