Mercurial > dropbear
view dropbearkey.c @ 1467:7279a633cc50
Merge branch 'houseofkodai-cli_bind_address_connect'
author | Matt Johnston <matt@ucc.asn.au> |
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date | Fri, 26 Jan 2018 00:32:39 +0800 |
parents | bdd3802c8ac6 |
children | d32bcb5c557d |
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/* * 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. */ /* The format of the keyfiles is basically a raw dump of the buffer. Data types * are specified in the transport rfc 4253 - string is a 32-bit len then the * non-null-terminated string, mp_int is a 32-bit len then the bignum data. * The actual functions are buf_put_rsa_priv_key() and buf_put_dss_priv_key() * RSA: * string "ssh-rsa" * mp_int e * mp_int n * mp_int d * mp_int p (newer versions only) * mp_int q (newer versions only) * * DSS: * string "ssh-dss" * mp_int p * mp_int q * mp_int g * mp_int y * mp_int x * */ #include "includes.h" #include "signkey.h" #include "buffer.h" #include "dbutil.h" #include "genrsa.h" #include "gendss.h" #include "ecdsa.h" #include "crypto_desc.h" #include "dbrandom.h" #include "gensignkey.h" static void printhelp(char * progname); static void printpubkey(sign_key * key, int keytype); static int printpubfile(const char* filename); /* Print a help message */ static void printhelp(char * progname) { fprintf(stderr, "Usage: %s -t <type> -f <filename> [-s bits]\n" "-t type Type of key to generate. One of:\n" #if DROPBEAR_RSA " rsa\n" #endif #if DROPBEAR_DSS " dss\n" #endif #if DROPBEAR_ECDSA " ecdsa\n" #endif "-f filename Use filename for the secret key.\n" " ~/.ssh/id_dropbear is recommended for client keys.\n" "-s bits Key size in bits, should be a multiple of 8 (optional)\n" #if DROPBEAR_DSS " DSS has a fixed size of 1024 bits\n" #endif #if DROPBEAR_ECDSA " ECDSA has sizes " #if DROPBEAR_ECC_256 "256 " #endif #if DROPBEAR_ECC_384 "384 " #endif #if DROPBEAR_ECC_521 "521 " #endif "\n" #endif "-y Just print the publickey and fingerprint for the\n private key in <filename>.\n" #if DEBUG_TRACE "-v verbose\n" #endif ,progname); } /* fails fatally */ static void check_signkey_bits(enum signkey_type type, int bits) { switch (type) { #if DROPBEAR_RSA case DROPBEAR_SIGNKEY_RSA: if (bits < 512 || bits > 4096 || (bits % 8 != 0)) { dropbear_exit("Bits must satisfy 512 <= bits <= 4096, and be a" " multiple of 8\n"); } break; #endif #ifdef DROPEAR_DSS case DROPBEAR_SIGNKEY_DSS: if (bits != 1024) { dropbear_exit("DSS keys have a fixed size of 1024 bits\n"); exit(EXIT_FAILURE); } #endif default: (void)0; /* quiet, compiler. ecdsa handles checks itself */ } } #if defined(DBMULTI_dropbearkey) || !DROPBEAR_MULTI #if defined(DBMULTI_dropbearkey) && DROPBEAR_MULTI int dropbearkey_main(int argc, char ** argv) { #else int main(int argc, char ** argv) { #endif int i; char ** next = NULL; char * filename = NULL; enum signkey_type keytype = DROPBEAR_SIGNKEY_NONE; char * typetext = NULL; char * sizetext = NULL; unsigned int bits = 0, genbits; int printpub = 0; crypto_init(); seedrandom(); /* get the commandline options */ for (i = 1; i < argc; i++) { if (argv[i] == NULL) { continue; /* Whack */ } if (next) { *next = argv[i]; next = NULL; continue; } if (argv[i][0] == '-') { switch (argv[i][1]) { case 'f': next = &filename; break; case 't': next = &typetext; break; case 's': next = &sizetext; break; case 'y': printpub = 1; break; case 'h': printhelp(argv[0]); exit(EXIT_SUCCESS); break; #if DEBUG_TRACE case 'v': debug_trace = 1; break; #endif default: fprintf(stderr, "Unknown argument %s\n", argv[i]); printhelp(argv[0]); exit(EXIT_FAILURE); break; } } } if (!filename) { fprintf(stderr, "Must specify a key filename\n"); printhelp(argv[0]); exit(EXIT_FAILURE); } if (printpub) { int ret = printpubfile(filename); exit(ret); } /* check/parse args */ if (!typetext) { fprintf(stderr, "Must specify key type\n"); printhelp(argv[0]); exit(EXIT_FAILURE); } #if DROPBEAR_RSA if (strcmp(typetext, "rsa") == 0) { keytype = DROPBEAR_SIGNKEY_RSA; } #endif #if DROPBEAR_DSS if (strcmp(typetext, "dss") == 0) { keytype = DROPBEAR_SIGNKEY_DSS; } #endif #if DROPBEAR_ECDSA if (strcmp(typetext, "ecdsa") == 0) { keytype = DROPBEAR_SIGNKEY_ECDSA_KEYGEN; } #endif if (keytype == DROPBEAR_SIGNKEY_NONE) { fprintf(stderr, "Unknown key type '%s'\n", typetext); printhelp(argv[0]); exit(EXIT_FAILURE); } if (sizetext) { if (sscanf(sizetext, "%u", &bits) != 1) { fprintf(stderr, "Bits must be an integer\n"); exit(EXIT_FAILURE); } check_signkey_bits(keytype, bits);; } genbits = signkey_generate_get_bits(keytype, bits); fprintf(stderr, "Generating %u bit %s key, this may take a while...\n", genbits, typetext); if (signkey_generate(keytype, bits, filename, 0) == DROPBEAR_FAILURE) { dropbear_exit("Failed to generate key.\n"); } printpubfile(filename); return EXIT_SUCCESS; } #endif static int printpubfile(const char* filename) { buffer *buf = NULL; sign_key *key = NULL; enum signkey_type keytype; int ret; int err = DROPBEAR_FAILURE; buf = buf_new(MAX_PRIVKEY_SIZE); ret = buf_readfile(buf, filename); if (ret != DROPBEAR_SUCCESS) { fprintf(stderr, "Failed reading '%s'\n", filename); goto out; } key = new_sign_key(); keytype = DROPBEAR_SIGNKEY_ANY; buf_setpos(buf, 0); ret = buf_get_priv_key(buf, key, &keytype); if (ret == DROPBEAR_FAILURE) { fprintf(stderr, "Bad key in '%s'\n", filename); goto out; } printpubkey(key, keytype); err = DROPBEAR_SUCCESS; out: buf_burn(buf); buf_free(buf); buf = NULL; if (key) { sign_key_free(key); key = NULL; } return err; } static void printpubkey(sign_key * key, int keytype) { buffer * buf = NULL; unsigned char base64key[MAX_PUBKEY_SIZE*2]; unsigned long base64len; int err; const char * typestring = NULL; char *fp = NULL; int len; struct passwd * pw = NULL; char * username = NULL; char hostname[100]; buf = buf_new(MAX_PUBKEY_SIZE); buf_put_pub_key(buf, key, keytype); buf_setpos(buf, 4); len = buf->len - buf->pos; base64len = sizeof(base64key); err = base64_encode(buf_getptr(buf, len), len, base64key, &base64len); if (err != CRYPT_OK) { fprintf(stderr, "base64 failed"); } typestring = signkey_name_from_type(keytype, NULL); fp = sign_key_fingerprint(buf_getptr(buf, len), len); /* a user@host comment is informative */ username = ""; pw = getpwuid(getuid()); if (pw) { username = pw->pw_name; } gethostname(hostname, sizeof(hostname)); hostname[sizeof(hostname)-1] = '\0'; printf("Public key portion is:\n%s %s %s@%s\nFingerprint: %s\n", typestring, base64key, username, hostname, fp); m_free(fp); buf_free(buf); }