1255767Sdes/* $OpenBSD: authfile.c,v 1.97 2013/05/17 00:13:13 djm Exp $ */ 257429Smarkm/* 357429Smarkm * Author: Tatu Ylonen <ylo@cs.hut.fi> 457429Smarkm * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland 557429Smarkm * All rights reserved 657429Smarkm * This file contains functions for reading and writing identity files, and 757429Smarkm * for reading the passphrase from the user. 860576Skris * 965674Skris * As far as I am concerned, the code I have written for this software 1065674Skris * can be used freely for any purpose. Any derived versions of this 1165674Skris * software must be clearly marked as such, and if the derived work is 1265674Skris * incompatible with the protocol description in the RFC file, it must be 1365674Skris * called by a name other than "ssh" or "Secure Shell". 1465674Skris * 1565674Skris * 1665674Skris * Copyright (c) 2000 Markus Friedl. All rights reserved. 1765674Skris * 1865674Skris * Redistribution and use in source and binary forms, with or without 1965674Skris * modification, are permitted provided that the following conditions 2065674Skris * are met: 2165674Skris * 1. Redistributions of source code must retain the above copyright 2265674Skris * notice, this list of conditions and the following disclaimer. 2365674Skris * 2. Redistributions in binary form must reproduce the above copyright 2465674Skris * notice, this list of conditions and the following disclaimer in the 2565674Skris * documentation and/or other materials provided with the distribution. 2665674Skris * 2765674Skris * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 2865674Skris * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 2965674Skris * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 3065674Skris * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 3165674Skris * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 3265674Skris * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 3365674Skris * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 3465674Skris * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 3565674Skris * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 3665674Skris * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 3757429Smarkm */ 3857429Smarkm 3957429Smarkm#include "includes.h" 4057429Smarkm 41162856Sdes#include <sys/types.h> 42162856Sdes#include <sys/stat.h> 43162856Sdes#include <sys/param.h> 44162856Sdes#include <sys/uio.h> 45162856Sdes 4676262Sgreen#include <openssl/err.h> 4776262Sgreen#include <openssl/evp.h> 4860576Skris#include <openssl/pem.h> 4960576Skris 50204917Sdes/* compatibility with old or broken OpenSSL versions */ 51204917Sdes#include "openbsd-compat/openssl-compat.h" 52204917Sdes 53162856Sdes#include <errno.h> 54162856Sdes#include <fcntl.h> 55162856Sdes#include <stdarg.h> 56162856Sdes#include <stdio.h> 57162856Sdes#include <stdlib.h> 58162856Sdes#include <string.h> 59162856Sdes#include <unistd.h> 60162856Sdes 61162856Sdes#include "xmalloc.h" 6276262Sgreen#include "cipher.h" 6357429Smarkm#include "buffer.h" 6476262Sgreen#include "key.h" 6557429Smarkm#include "ssh.h" 6676262Sgreen#include "log.h" 6776262Sgreen#include "authfile.h" 6892559Sdes#include "rsa.h" 69147005Sdes#include "misc.h" 70149753Sdes#include "atomicio.h" 7157429Smarkm 72226046Sdes#define MAX_KEY_FILE_SIZE (1024 * 1024) 73226046Sdes 7476262Sgreen/* Version identification string for SSH v1 identity files. */ 7576262Sgreenstatic const char authfile_id_string[] = 7676262Sgreen "SSH PRIVATE KEY FILE FORMAT 1.1\n"; 7757429Smarkm 7857429Smarkm/* 79221420Sdes * Serialises the authentication (private) key to a blob, encrypting it with 80221420Sdes * passphrase. The identification of the blob (lowest 64 bits of n) will 8157429Smarkm * precede the key to provide identification of the key without needing a 8257429Smarkm * passphrase. 8357429Smarkm */ 8492559Sdesstatic int 85221420Sdeskey_private_rsa1_to_blob(Key *key, Buffer *blob, const char *passphrase, 8676262Sgreen const char *comment) 8757429Smarkm{ 8857429Smarkm Buffer buffer, encrypted; 8992559Sdes u_char buf[100], *cp; 90221420Sdes int i, cipher_num; 9169591Sgreen CipherContext ciphercontext; 92255767Sdes const Cipher *cipher; 93137019Sdes u_int32_t rnd; 9457429Smarkm 9557429Smarkm /* 9657429Smarkm * If the passphrase is empty, use SSH_CIPHER_NONE to ease converting 9757429Smarkm * to another cipher; otherwise use SSH_AUTHFILE_CIPHER. 9857429Smarkm */ 9992559Sdes cipher_num = (strcmp(passphrase, "") == 0) ? 10092559Sdes SSH_CIPHER_NONE : SSH_AUTHFILE_CIPHER; 10192559Sdes if ((cipher = cipher_by_number(cipher_num)) == NULL) 10269591Sgreen fatal("save_private_key_rsa: bad cipher"); 10357429Smarkm 10457429Smarkm /* This buffer is used to built the secret part of the private key. */ 10557429Smarkm buffer_init(&buffer); 10657429Smarkm 10757429Smarkm /* Put checkbytes for checking passphrase validity. */ 108137019Sdes rnd = arc4random(); 109137019Sdes buf[0] = rnd & 0xff; 110137019Sdes buf[1] = (rnd >> 8) & 0xff; 11157429Smarkm buf[2] = buf[0]; 11257429Smarkm buf[3] = buf[1]; 11357429Smarkm buffer_append(&buffer, buf, 4); 11457429Smarkm 11557429Smarkm /* 11657429Smarkm * Store the private key (n and e will not be stored because they 11757429Smarkm * will be stored in plain text, and storing them also in encrypted 11857429Smarkm * format would just give known plaintext). 11957429Smarkm */ 12076262Sgreen buffer_put_bignum(&buffer, key->rsa->d); 12176262Sgreen buffer_put_bignum(&buffer, key->rsa->iqmp); 12276262Sgreen buffer_put_bignum(&buffer, key->rsa->q); /* reverse from SSL p */ 12376262Sgreen buffer_put_bignum(&buffer, key->rsa->p); /* reverse from SSL q */ 12457429Smarkm 12557429Smarkm /* Pad the part to be encrypted until its size is a multiple of 8. */ 12657429Smarkm while (buffer_len(&buffer) % 8 != 0) 12757429Smarkm buffer_put_char(&buffer, 0); 12857429Smarkm 12957429Smarkm /* This buffer will be used to contain the data in the file. */ 13057429Smarkm buffer_init(&encrypted); 13157429Smarkm 13257429Smarkm /* First store keyfile id string. */ 13376262Sgreen for (i = 0; authfile_id_string[i]; i++) 13476262Sgreen buffer_put_char(&encrypted, authfile_id_string[i]); 13557429Smarkm buffer_put_char(&encrypted, 0); 13657429Smarkm 13757429Smarkm /* Store cipher type. */ 13892559Sdes buffer_put_char(&encrypted, cipher_num); 13957429Smarkm buffer_put_int(&encrypted, 0); /* For future extension */ 14057429Smarkm 14157429Smarkm /* Store public key. This will be in plain text. */ 14276262Sgreen buffer_put_int(&encrypted, BN_num_bits(key->rsa->n)); 14376262Sgreen buffer_put_bignum(&encrypted, key->rsa->n); 14476262Sgreen buffer_put_bignum(&encrypted, key->rsa->e); 14592559Sdes buffer_put_cstring(&encrypted, comment); 14657429Smarkm 14757429Smarkm /* Allocate space for the private part of the key in the buffer. */ 14892559Sdes cp = buffer_append_space(&encrypted, buffer_len(&buffer)); 14957429Smarkm 15092559Sdes cipher_set_key_string(&ciphercontext, cipher, passphrase, 15192559Sdes CIPHER_ENCRYPT); 15292559Sdes cipher_crypt(&ciphercontext, cp, 153248619Sdes buffer_ptr(&buffer), buffer_len(&buffer), 0, 0); 15492559Sdes cipher_cleanup(&ciphercontext); 15569591Sgreen memset(&ciphercontext, 0, sizeof(ciphercontext)); 15657429Smarkm 15757429Smarkm /* Destroy temporary data. */ 15857429Smarkm memset(buf, 0, sizeof(buf)); 15957429Smarkm buffer_free(&buffer); 16057429Smarkm 161221420Sdes buffer_append(blob, buffer_ptr(&encrypted), buffer_len(&encrypted)); 16257429Smarkm buffer_free(&encrypted); 163221420Sdes 16457429Smarkm return 1; 16557429Smarkm} 16657429Smarkm 167221420Sdes/* convert SSH v2 key in OpenSSL PEM format */ 16892559Sdesstatic int 169221420Sdeskey_private_pem_to_blob(Key *key, Buffer *blob, const char *_passphrase, 17076262Sgreen const char *comment) 17160576Skris{ 17276262Sgreen int success = 0; 173221420Sdes int blen, len = strlen(_passphrase); 17492559Sdes u_char *passphrase = (len > 0) ? (u_char *)_passphrase : NULL; 175204917Sdes#if (OPENSSL_VERSION_NUMBER < 0x00907000L) 17692559Sdes const EVP_CIPHER *cipher = (len > 0) ? EVP_des_ede3_cbc() : NULL; 177204917Sdes#else 178204917Sdes const EVP_CIPHER *cipher = (len > 0) ? EVP_aes_128_cbc() : NULL; 179204917Sdes#endif 180221420Sdes const u_char *bptr; 181221420Sdes BIO *bio; 18260576Skris 18360576Skris if (len > 0 && len <= 4) { 18476262Sgreen error("passphrase too short: have %d bytes, need > 4", len); 18560576Skris return 0; 18660576Skris } 187221420Sdes if ((bio = BIO_new(BIO_s_mem())) == NULL) { 188221420Sdes error("%s: BIO_new failed", __func__); 18960576Skris return 0; 19060576Skris } 19176262Sgreen switch (key->type) { 19276262Sgreen case KEY_DSA: 193221420Sdes success = PEM_write_bio_DSAPrivateKey(bio, key->dsa, 19476262Sgreen cipher, passphrase, len, NULL, NULL); 19576262Sgreen break; 196221420Sdes#ifdef OPENSSL_HAS_ECC 197221420Sdes case KEY_ECDSA: 198221420Sdes success = PEM_write_bio_ECPrivateKey(bio, key->ecdsa, 199221420Sdes cipher, passphrase, len, NULL, NULL); 200221420Sdes break; 201221420Sdes#endif 20276262Sgreen case KEY_RSA: 203221420Sdes success = PEM_write_bio_RSAPrivateKey(bio, key->rsa, 20476262Sgreen cipher, passphrase, len, NULL, NULL); 20576262Sgreen break; 20660576Skris } 207221420Sdes if (success) { 208221420Sdes if ((blen = BIO_get_mem_data(bio, &bptr)) <= 0) 209221420Sdes success = 0; 210221420Sdes else 211221420Sdes buffer_append(blob, bptr, blen); 212221420Sdes } 213221420Sdes BIO_free(bio); 21460576Skris return success; 21560576Skris} 21660576Skris 217221420Sdes/* Save a key blob to a file */ 218221420Sdesstatic int 219221420Sdeskey_save_private_blob(Buffer *keybuf, const char *filename) 220221420Sdes{ 221221420Sdes int fd; 222221420Sdes 223221420Sdes if ((fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0600)) < 0) { 224221420Sdes error("open %s failed: %s.", filename, strerror(errno)); 225221420Sdes return 0; 226221420Sdes } 227221420Sdes if (atomicio(vwrite, fd, buffer_ptr(keybuf), 228221420Sdes buffer_len(keybuf)) != buffer_len(keybuf)) { 229221420Sdes error("write to key file %s failed: %s", filename, 230221420Sdes strerror(errno)); 231221420Sdes close(fd); 232221420Sdes unlink(filename); 233221420Sdes return 0; 234221420Sdes } 235221420Sdes close(fd); 236221420Sdes return 1; 237221420Sdes} 238221420Sdes 239221420Sdes/* Serialise "key" to buffer "blob" */ 240221420Sdesstatic int 241221420Sdeskey_private_to_blob(Key *key, Buffer *blob, const char *passphrase, 24260576Skris const char *comment) 24360576Skris{ 24460576Skris switch (key->type) { 24576262Sgreen case KEY_RSA1: 246221420Sdes return key_private_rsa1_to_blob(key, blob, passphrase, comment); 24760576Skris case KEY_DSA: 248221420Sdes case KEY_ECDSA: 24976262Sgreen case KEY_RSA: 250221420Sdes return key_private_pem_to_blob(key, blob, passphrase, comment); 25160576Skris default: 252221420Sdes error("%s: cannot save key type %d", __func__, key->type); 253221420Sdes return 0; 25460576Skris } 25560576Skris} 25660576Skris 257221420Sdesint 258221420Sdeskey_save_private(Key *key, const char *filename, const char *passphrase, 259221420Sdes const char *comment) 260221420Sdes{ 261221420Sdes Buffer keyblob; 262221420Sdes int success = 0; 263221420Sdes 264221420Sdes buffer_init(&keyblob); 265221420Sdes if (!key_private_to_blob(key, &keyblob, passphrase, comment)) 266221420Sdes goto out; 267221420Sdes if (!key_save_private_blob(&keyblob, filename)) 268221420Sdes goto out; 269221420Sdes success = 1; 270221420Sdes out: 271221420Sdes buffer_free(&keyblob); 272221420Sdes return success; 273221420Sdes} 274221420Sdes 27557429Smarkm/* 276221420Sdes * Parse the public, unencrypted portion of a RSA1 key. 27757429Smarkm */ 27892559Sdesstatic Key * 279221420Sdeskey_parse_public_rsa1(Buffer *blob, char **commentp) 28057429Smarkm{ 28176262Sgreen Key *pub; 282226046Sdes Buffer copy; 283221420Sdes 284221420Sdes /* Check that it is at least big enough to contain the ID string. */ 285221420Sdes if (buffer_len(blob) < sizeof(authfile_id_string)) { 286221420Sdes debug3("Truncated RSA1 identifier"); 287221420Sdes return NULL; 288221420Sdes } 289221420Sdes 290221420Sdes /* 291221420Sdes * Make sure it begins with the id string. Consume the id string 292221420Sdes * from the buffer. 293221420Sdes */ 294221420Sdes if (memcmp(buffer_ptr(blob), authfile_id_string, 295221420Sdes sizeof(authfile_id_string)) != 0) { 296221420Sdes debug3("Incorrect RSA1 identifier"); 297221420Sdes return NULL; 298221420Sdes } 299226046Sdes buffer_init(©); 300226046Sdes buffer_append(©, buffer_ptr(blob), buffer_len(blob)); 301226046Sdes buffer_consume(©, sizeof(authfile_id_string)); 302221420Sdes 303221420Sdes /* Skip cipher type and reserved data. */ 304226046Sdes (void) buffer_get_char(©); /* cipher type */ 305226046Sdes (void) buffer_get_int(©); /* reserved */ 306221420Sdes 307221420Sdes /* Read the public key from the buffer. */ 308226046Sdes (void) buffer_get_int(©); 309221420Sdes pub = key_new(KEY_RSA1); 310226046Sdes buffer_get_bignum(©, pub->rsa->n); 311226046Sdes buffer_get_bignum(©, pub->rsa->e); 312221420Sdes if (commentp) 313226046Sdes *commentp = buffer_get_string(©, NULL); 314221420Sdes /* The encrypted private part is not parsed by this function. */ 315226046Sdes buffer_free(©); 316221420Sdes 317221420Sdes return pub; 318221420Sdes} 319221420Sdes 320226046Sdes/* Load a key from a fd into a buffer */ 321226046Sdesint 322221420Sdeskey_load_file(int fd, const char *filename, Buffer *blob) 323221420Sdes{ 324226046Sdes u_char buf[1024]; 325221420Sdes size_t len; 326113911Sdes struct stat st; 32757429Smarkm 328113911Sdes if (fstat(fd, &st) < 0) { 329221420Sdes error("%s: fstat of key file %.200s%sfailed: %.100s", __func__, 330221420Sdes filename == NULL ? "" : filename, 331221420Sdes filename == NULL ? "" : " ", 332221420Sdes strerror(errno)); 333221420Sdes return 0; 334113911Sdes } 335226046Sdes if ((st.st_mode & (S_IFSOCK|S_IFCHR|S_IFIFO)) == 0 && 336226046Sdes st.st_size > MAX_KEY_FILE_SIZE) { 337226046Sdes toobig: 338221420Sdes error("%s: key file %.200s%stoo large", __func__, 339221420Sdes filename == NULL ? "" : filename, 340221420Sdes filename == NULL ? "" : " "); 341221420Sdes return 0; 342147005Sdes } 343240075Sdes buffer_clear(blob); 344226046Sdes for (;;) { 345226046Sdes if ((len = atomicio(read, fd, buf, sizeof(buf))) == 0) { 346226046Sdes if (errno == EPIPE) 347226046Sdes break; 348226046Sdes debug("%s: read from key file %.200s%sfailed: %.100s", 349226046Sdes __func__, filename == NULL ? "" : filename, 350226046Sdes filename == NULL ? "" : " ", strerror(errno)); 351226046Sdes buffer_clear(blob); 352226046Sdes bzero(buf, sizeof(buf)); 353226046Sdes return 0; 354226046Sdes } 355226046Sdes buffer_append(blob, buf, len); 356226046Sdes if (buffer_len(blob) > MAX_KEY_FILE_SIZE) { 357226046Sdes buffer_clear(blob); 358226046Sdes bzero(buf, sizeof(buf)); 359226046Sdes goto toobig; 360226046Sdes } 361226046Sdes } 362226046Sdes bzero(buf, sizeof(buf)); 363226046Sdes if ((st.st_mode & (S_IFSOCK|S_IFCHR|S_IFIFO)) == 0 && 364226046Sdes st.st_size != buffer_len(blob)) { 365226046Sdes debug("%s: key file %.200s%schanged size while reading", 366226046Sdes __func__, filename == NULL ? "" : filename, 367226046Sdes filename == NULL ? "" : " "); 368221420Sdes buffer_clear(blob); 369221420Sdes return 0; 37057429Smarkm } 371226046Sdes 372221420Sdes return 1; 373221420Sdes} 37457429Smarkm 375221420Sdes/* 376221420Sdes * Loads the public part of the ssh v1 key file. Returns NULL if an error was 377221420Sdes * encountered (the file does not exist or is not readable), and the key 378221420Sdes * otherwise. 379221420Sdes */ 380221420Sdesstatic Key * 381221420Sdeskey_load_public_rsa1(int fd, const char *filename, char **commentp) 382221420Sdes{ 383221420Sdes Buffer buffer; 384221420Sdes Key *pub; 385221420Sdes 386221420Sdes buffer_init(&buffer); 387221420Sdes if (!key_load_file(fd, filename, &buffer)) { 38857429Smarkm buffer_free(&buffer); 38976262Sgreen return NULL; 39057429Smarkm } 39157429Smarkm 392221420Sdes pub = key_parse_public_rsa1(&buffer, commentp); 393221420Sdes if (pub == NULL) 394221420Sdes debug3("Could not load \"%s\" as a RSA1 public key", filename); 39557429Smarkm buffer_free(&buffer); 39676262Sgreen return pub; 39757429Smarkm} 39857429Smarkm 39976262Sgreen/* load public key from private-key file, works only for SSH v1 */ 40076262SgreenKey * 40176262Sgreenkey_load_public_type(int type, const char *filename, char **commentp) 40260576Skris{ 40376262Sgreen Key *pub; 40476262Sgreen int fd; 40576262Sgreen 40676262Sgreen if (type == KEY_RSA1) { 40776262Sgreen fd = open(filename, O_RDONLY); 40876262Sgreen if (fd < 0) 40976262Sgreen return NULL; 41076262Sgreen pub = key_load_public_rsa1(fd, filename, commentp); 41176262Sgreen close(fd); 41276262Sgreen return pub; 41360576Skris } 41476262Sgreen return NULL; 41560576Skris} 41660576Skris 41792559Sdesstatic Key * 418221420Sdeskey_parse_private_rsa1(Buffer *blob, const char *passphrase, char **commentp) 41957429Smarkm{ 420149753Sdes int check1, check2, cipher_type; 421221420Sdes Buffer decrypted; 42292559Sdes u_char *cp; 42369591Sgreen CipherContext ciphercontext; 424255767Sdes const Cipher *cipher; 42576262Sgreen Key *prv = NULL; 426226046Sdes Buffer copy; 42757429Smarkm 428221420Sdes /* Check that it is at least big enough to contain the ID string. */ 429221420Sdes if (buffer_len(blob) < sizeof(authfile_id_string)) { 430221420Sdes debug3("Truncated RSA1 identifier"); 431113911Sdes return NULL; 432113911Sdes } 43357429Smarkm 43457429Smarkm /* 43557429Smarkm * Make sure it begins with the id string. Consume the id string 43657429Smarkm * from the buffer. 43757429Smarkm */ 438221420Sdes if (memcmp(buffer_ptr(blob), authfile_id_string, 439221420Sdes sizeof(authfile_id_string)) != 0) { 440221420Sdes debug3("Incorrect RSA1 identifier"); 441221420Sdes return NULL; 442221420Sdes } 443226046Sdes buffer_init(©); 444226046Sdes buffer_append(©, buffer_ptr(blob), buffer_len(blob)); 445226046Sdes buffer_consume(©, sizeof(authfile_id_string)); 44676262Sgreen 44757429Smarkm /* Read cipher type. */ 448226046Sdes cipher_type = buffer_get_char(©); 449226046Sdes (void) buffer_get_int(©); /* Reserved data. */ 45057429Smarkm 45157429Smarkm /* Read the public key from the buffer. */ 452226046Sdes (void) buffer_get_int(©); 45376262Sgreen prv = key_new_private(KEY_RSA1); 45476262Sgreen 455226046Sdes buffer_get_bignum(©, prv->rsa->n); 456226046Sdes buffer_get_bignum(©, prv->rsa->e); 45776262Sgreen if (commentp) 458226046Sdes *commentp = buffer_get_string(©, NULL); 45957429Smarkm else 460226046Sdes (void)buffer_get_string_ptr(©, NULL); 46157429Smarkm 46257429Smarkm /* Check that it is a supported cipher. */ 46369591Sgreen cipher = cipher_by_number(cipher_type); 46469591Sgreen if (cipher == NULL) { 465221420Sdes debug("Unsupported RSA1 cipher %d", cipher_type); 466226046Sdes buffer_free(©); 46757429Smarkm goto fail; 46857429Smarkm } 46957429Smarkm /* Initialize space for decrypted data. */ 47057429Smarkm buffer_init(&decrypted); 471226046Sdes cp = buffer_append_space(&decrypted, buffer_len(©)); 47257429Smarkm 47357429Smarkm /* Rest of the buffer is encrypted. Decrypt it using the passphrase. */ 47492559Sdes cipher_set_key_string(&ciphercontext, cipher, passphrase, 47592559Sdes CIPHER_DECRYPT); 47692559Sdes cipher_crypt(&ciphercontext, cp, 477248619Sdes buffer_ptr(©), buffer_len(©), 0, 0); 47892559Sdes cipher_cleanup(&ciphercontext); 47969591Sgreen memset(&ciphercontext, 0, sizeof(ciphercontext)); 480226046Sdes buffer_free(©); 48157429Smarkm 48257429Smarkm check1 = buffer_get_char(&decrypted); 48357429Smarkm check2 = buffer_get_char(&decrypted); 48457429Smarkm if (check1 != buffer_get_char(&decrypted) || 48557429Smarkm check2 != buffer_get_char(&decrypted)) { 48657429Smarkm if (strcmp(passphrase, "") != 0) 487221420Sdes debug("Bad passphrase supplied for RSA1 key"); 48857429Smarkm /* Bad passphrase. */ 48957429Smarkm buffer_free(&decrypted); 49076262Sgreen goto fail; 49157429Smarkm } 49257429Smarkm /* Read the rest of the private key. */ 49376262Sgreen buffer_get_bignum(&decrypted, prv->rsa->d); 49476262Sgreen buffer_get_bignum(&decrypted, prv->rsa->iqmp); /* u */ 49576262Sgreen /* in SSL and SSH v1 p and q are exchanged */ 49676262Sgreen buffer_get_bignum(&decrypted, prv->rsa->q); /* p */ 49776262Sgreen buffer_get_bignum(&decrypted, prv->rsa->p); /* q */ 49857429Smarkm 49976262Sgreen /* calculate p-1 and q-1 */ 50092559Sdes rsa_generate_additional_parameters(prv->rsa); 50157429Smarkm 50257429Smarkm buffer_free(&decrypted); 503113911Sdes 504113911Sdes /* enable blinding */ 505113911Sdes if (RSA_blinding_on(prv->rsa, NULL) != 1) { 506221420Sdes error("%s: RSA_blinding_on failed", __func__); 507113911Sdes goto fail; 508113911Sdes } 50976262Sgreen return prv; 51057429Smarkm 51176262Sgreenfail: 512255767Sdes if (commentp != NULL) 513255767Sdes free(*commentp); 51476262Sgreen key_free(prv); 51576262Sgreen return NULL; 51657429Smarkm} 51760576Skris 518221420Sdesstatic Key * 519221420Sdeskey_parse_private_pem(Buffer *blob, int type, const char *passphrase, 52076262Sgreen char **commentp) 52160576Skris{ 52276262Sgreen EVP_PKEY *pk = NULL; 52376262Sgreen Key *prv = NULL; 52476262Sgreen char *name = "<no key>"; 525221420Sdes BIO *bio; 52660576Skris 527221420Sdes if ((bio = BIO_new_mem_buf(buffer_ptr(blob), 528221420Sdes buffer_len(blob))) == NULL) { 529221420Sdes error("%s: BIO_new_mem_buf failed", __func__); 53076262Sgreen return NULL; 53160576Skris } 532221420Sdes 533221420Sdes pk = PEM_read_bio_PrivateKey(bio, NULL, NULL, (char *)passphrase); 534221420Sdes BIO_free(bio); 53576262Sgreen if (pk == NULL) { 536221420Sdes debug("%s: PEM_read_PrivateKey failed", __func__); 53776262Sgreen (void)ERR_get_error(); 53876262Sgreen } else if (pk->type == EVP_PKEY_RSA && 53992559Sdes (type == KEY_UNSPEC||type==KEY_RSA)) { 54076262Sgreen prv = key_new(KEY_UNSPEC); 54176262Sgreen prv->rsa = EVP_PKEY_get1_RSA(pk); 54276262Sgreen prv->type = KEY_RSA; 54376262Sgreen name = "rsa w/o comment"; 54476262Sgreen#ifdef DEBUG_PK 54576262Sgreen RSA_print_fp(stderr, prv->rsa, 8); 54676262Sgreen#endif 547113911Sdes if (RSA_blinding_on(prv->rsa, NULL) != 1) { 548221420Sdes error("%s: RSA_blinding_on failed", __func__); 549113911Sdes key_free(prv); 550113911Sdes prv = NULL; 551113911Sdes } 55276262Sgreen } else if (pk->type == EVP_PKEY_DSA && 55392559Sdes (type == KEY_UNSPEC||type==KEY_DSA)) { 55476262Sgreen prv = key_new(KEY_UNSPEC); 55576262Sgreen prv->dsa = EVP_PKEY_get1_DSA(pk); 55676262Sgreen prv->type = KEY_DSA; 55776262Sgreen name = "dsa w/o comment"; 55876262Sgreen#ifdef DEBUG_PK 55976262Sgreen DSA_print_fp(stderr, prv->dsa, 8); 56076262Sgreen#endif 561221420Sdes#ifdef OPENSSL_HAS_ECC 562221420Sdes } else if (pk->type == EVP_PKEY_EC && 563221420Sdes (type == KEY_UNSPEC||type==KEY_ECDSA)) { 564221420Sdes prv = key_new(KEY_UNSPEC); 565221420Sdes prv->ecdsa = EVP_PKEY_get1_EC_KEY(pk); 566221420Sdes prv->type = KEY_ECDSA; 567221420Sdes if ((prv->ecdsa_nid = key_ecdsa_key_to_nid(prv->ecdsa)) == -1 || 568221420Sdes key_curve_nid_to_name(prv->ecdsa_nid) == NULL || 569221420Sdes key_ec_validate_public(EC_KEY_get0_group(prv->ecdsa), 570221420Sdes EC_KEY_get0_public_key(prv->ecdsa)) != 0 || 571221420Sdes key_ec_validate_private(prv->ecdsa) != 0) { 572221420Sdes error("%s: bad ECDSA key", __func__); 573221420Sdes key_free(prv); 574221420Sdes prv = NULL; 575221420Sdes } 576221420Sdes name = "ecdsa w/o comment"; 577221420Sdes#ifdef DEBUG_PK 578221420Sdes if (prv != NULL && prv->ecdsa != NULL) 579221420Sdes key_dump_ec_key(prv->ecdsa); 580221420Sdes#endif 581221420Sdes#endif /* OPENSSL_HAS_ECC */ 58260576Skris } else { 583221420Sdes error("%s: PEM_read_PrivateKey: mismatch or " 584221420Sdes "unknown EVP_PKEY save_type %d", __func__, pk->save_type); 58560576Skris } 58676262Sgreen if (pk != NULL) 58776262Sgreen EVP_PKEY_free(pk); 58876262Sgreen if (prv != NULL && commentp) 58976262Sgreen *commentp = xstrdup(name); 59076262Sgreen debug("read PEM private key done: type %s", 59176262Sgreen prv ? key_type(prv) : "<unknown>"); 59276262Sgreen return prv; 59360576Skris} 59460576Skris 595221420SdesKey * 596221420Sdeskey_load_private_pem(int fd, int type, const char *passphrase, 597221420Sdes char **commentp) 598221420Sdes{ 599221420Sdes Buffer buffer; 600221420Sdes Key *prv; 601221420Sdes 602221420Sdes buffer_init(&buffer); 603221420Sdes if (!key_load_file(fd, NULL, &buffer)) { 604221420Sdes buffer_free(&buffer); 605221420Sdes return NULL; 606221420Sdes } 607221420Sdes prv = key_parse_private_pem(&buffer, type, passphrase, commentp); 608221420Sdes buffer_free(&buffer); 609221420Sdes return prv; 610221420Sdes} 611221420Sdes 612162856Sdesint 61376262Sgreenkey_perm_ok(int fd, const char *filename) 61460576Skris{ 61560576Skris struct stat st; 61660576Skris 61792559Sdes if (fstat(fd, &st) < 0) 61892559Sdes return 0; 61992559Sdes /* 62092559Sdes * if a key owned by the user is accessed, then we check the 62192559Sdes * permissions of the file. if the key owned by a different user, 62292559Sdes * then we don't care. 62392559Sdes */ 62498941Sdes#ifdef HAVE_CYGWIN 62598941Sdes if (check_ntsec(filename)) 62698941Sdes#endif 62792559Sdes if ((st.st_uid == getuid()) && (st.st_mode & 077) != 0) { 62860576Skris error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"); 62960576Skris error("@ WARNING: UNPROTECTED PRIVATE KEY FILE! @"); 63060576Skris error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"); 63192559Sdes error("Permissions 0%3.3o for '%s' are too open.", 632124211Sdes (u_int)st.st_mode & 0777, filename); 633226046Sdes error("It is required that your private key files are NOT accessible by others."); 63476262Sgreen error("This private key will be ignored."); 63560576Skris return 0; 63660576Skris } 63776262Sgreen return 1; 63876262Sgreen} 63976262Sgreen 640221420Sdesstatic Key * 641221420Sdeskey_parse_private_type(Buffer *blob, int type, const char *passphrase, 642221420Sdes char **commentp) 643221420Sdes{ 644221420Sdes switch (type) { 645221420Sdes case KEY_RSA1: 646221420Sdes return key_parse_private_rsa1(blob, passphrase, commentp); 647221420Sdes case KEY_DSA: 648221420Sdes case KEY_ECDSA: 649221420Sdes case KEY_RSA: 650221420Sdes case KEY_UNSPEC: 651221420Sdes return key_parse_private_pem(blob, type, passphrase, commentp); 652221420Sdes default: 653226046Sdes error("%s: cannot parse key type %d", __func__, type); 654221420Sdes break; 655221420Sdes } 656221420Sdes return NULL; 657221420Sdes} 658221420Sdes 65976262SgreenKey * 66076262Sgreenkey_load_private_type(int type, const char *filename, const char *passphrase, 661162856Sdes char **commentp, int *perm_ok) 66276262Sgreen{ 66376262Sgreen int fd; 664221420Sdes Key *ret; 665221420Sdes Buffer buffer; 66676262Sgreen 66776262Sgreen fd = open(filename, O_RDONLY); 668204917Sdes if (fd < 0) { 669204917Sdes debug("could not open key file '%s': %s", filename, 670204917Sdes strerror(errno)); 671204917Sdes if (perm_ok != NULL) 672204917Sdes *perm_ok = 0; 67376262Sgreen return NULL; 674204917Sdes } 67576262Sgreen if (!key_perm_ok(fd, filename)) { 676162856Sdes if (perm_ok != NULL) 677162856Sdes *perm_ok = 0; 67876262Sgreen error("bad permissions: ignore key: %s", filename); 67976262Sgreen close(fd); 68076262Sgreen return NULL; 68176262Sgreen } 682162856Sdes if (perm_ok != NULL) 683162856Sdes *perm_ok = 1; 684221420Sdes 685221420Sdes buffer_init(&buffer); 686221420Sdes if (!key_load_file(fd, filename, &buffer)) { 687221420Sdes buffer_free(&buffer); 68876262Sgreen close(fd); 689221420Sdes return NULL; 69060576Skris } 691221420Sdes close(fd); 692221420Sdes ret = key_parse_private_type(&buffer, type, passphrase, commentp); 693221420Sdes buffer_free(&buffer); 694221420Sdes return ret; 69560576Skris} 69665674Skris 69776262SgreenKey * 698226046Sdeskey_parse_private(Buffer *buffer, const char *filename, 699226046Sdes const char *passphrase, char **commentp) 700226046Sdes{ 701226046Sdes Key *pub, *prv; 702226046Sdes 703226046Sdes /* it's a SSH v1 key if the public key part is readable */ 704226046Sdes pub = key_parse_public_rsa1(buffer, commentp); 705226046Sdes if (pub == NULL) { 706226046Sdes prv = key_parse_private_type(buffer, KEY_UNSPEC, 707226046Sdes passphrase, NULL); 708226046Sdes /* use the filename as a comment for PEM */ 709226046Sdes if (commentp && prv) 710226046Sdes *commentp = xstrdup(filename); 711226046Sdes } else { 712226046Sdes key_free(pub); 713226046Sdes /* key_parse_public_rsa1() has already loaded the comment */ 714226046Sdes prv = key_parse_private_type(buffer, KEY_RSA1, passphrase, 715226046Sdes NULL); 716226046Sdes } 717226046Sdes return prv; 718226046Sdes} 719226046Sdes 720226046SdesKey * 72176262Sgreenkey_load_private(const char *filename, const char *passphrase, 72276262Sgreen char **commentp) 72376262Sgreen{ 724226046Sdes Key *prv; 725226046Sdes Buffer buffer; 72676262Sgreen int fd; 72776262Sgreen 72876262Sgreen fd = open(filename, O_RDONLY); 729204917Sdes if (fd < 0) { 730204917Sdes debug("could not open key file '%s': %s", filename, 731204917Sdes strerror(errno)); 73276262Sgreen return NULL; 733204917Sdes } 73476262Sgreen if (!key_perm_ok(fd, filename)) { 73576262Sgreen error("bad permissions: ignore key: %s", filename); 73676262Sgreen close(fd); 73776262Sgreen return NULL; 73876262Sgreen } 739221420Sdes 740221420Sdes buffer_init(&buffer); 741221420Sdes if (!key_load_file(fd, filename, &buffer)) { 742221420Sdes buffer_free(&buffer); 743221420Sdes close(fd); 744221420Sdes return NULL; 745221420Sdes } 746221420Sdes close(fd); 747221420Sdes 748226046Sdes prv = key_parse_private(&buffer, filename, passphrase, commentp); 749221420Sdes buffer_free(&buffer); 75092559Sdes return prv; 75176262Sgreen} 75276262Sgreen 75392559Sdesstatic int 75476262Sgreenkey_try_load_public(Key *k, const char *filename, char **commentp) 75565674Skris{ 75665674Skris FILE *f; 757147005Sdes char line[SSH_MAX_PUBKEY_BYTES]; 75865674Skris char *cp; 759147005Sdes u_long linenum = 0; 76065674Skris 76165674Skris f = fopen(filename, "r"); 76265674Skris if (f != NULL) { 763147005Sdes while (read_keyfile_line(f, filename, line, sizeof(line), 764147005Sdes &linenum) != -1) { 76565674Skris cp = line; 76692559Sdes switch (*cp) { 76765674Skris case '#': 76865674Skris case '\n': 76965674Skris case '\0': 77065674Skris continue; 77165674Skris } 772226046Sdes /* Abort loading if this looks like a private key */ 773226046Sdes if (strncmp(cp, "-----BEGIN", 10) == 0) 774226046Sdes break; 77565674Skris /* Skip leading whitespace. */ 77665674Skris for (; *cp && (*cp == ' ' || *cp == '\t'); cp++) 77765674Skris ; 77865674Skris if (*cp) { 77976262Sgreen if (key_read(k, &cp) == 1) { 780226046Sdes cp[strcspn(cp, "\r\n")] = '\0'; 781226046Sdes if (commentp) { 782226046Sdes *commentp = xstrdup(*cp ? 783226046Sdes cp : filename); 784226046Sdes } 78565674Skris fclose(f); 78665674Skris return 1; 78765674Skris } 78865674Skris } 78965674Skris } 79065674Skris fclose(f); 79165674Skris } 79265674Skris return 0; 79365674Skris} 79465674Skris 79576262Sgreen/* load public key from ssh v1 private or any pubkey file */ 79676262SgreenKey * 79776262Sgreenkey_load_public(const char *filename, char **commentp) 79865674Skris{ 79976262Sgreen Key *pub; 80076262Sgreen char file[MAXPATHLEN]; 80165674Skris 802124211Sdes /* try rsa1 private key */ 80376262Sgreen pub = key_load_public_type(KEY_RSA1, filename, commentp); 80476262Sgreen if (pub != NULL) 80576262Sgreen return pub; 806124211Sdes 807124211Sdes /* try rsa1 public key */ 808124211Sdes pub = key_new(KEY_RSA1); 809124211Sdes if (key_try_load_public(pub, filename, commentp) == 1) 810124211Sdes return pub; 811124211Sdes key_free(pub); 812124211Sdes 813124211Sdes /* try ssh2 public key */ 81476262Sgreen pub = key_new(KEY_UNSPEC); 81576262Sgreen if (key_try_load_public(pub, filename, commentp) == 1) 81676262Sgreen return pub; 81776262Sgreen if ((strlcpy(file, filename, sizeof file) < sizeof(file)) && 81876262Sgreen (strlcat(file, ".pub", sizeof file) < sizeof(file)) && 81976262Sgreen (key_try_load_public(pub, file, commentp) == 1)) 82076262Sgreen return pub; 82176262Sgreen key_free(pub); 82276262Sgreen return NULL; 82365674Skris} 824204917Sdes 825215116Sdes/* Load the certificate associated with the named private key */ 826215116SdesKey * 827215116Sdeskey_load_cert(const char *filename) 828215116Sdes{ 829215116Sdes Key *pub; 830215116Sdes char *file; 831215116Sdes 832215116Sdes pub = key_new(KEY_UNSPEC); 833215116Sdes xasprintf(&file, "%s-cert.pub", filename); 834215116Sdes if (key_try_load_public(pub, file, NULL) == 1) { 835255767Sdes free(file); 836215116Sdes return pub; 837215116Sdes } 838255767Sdes free(file); 839215116Sdes key_free(pub); 840215116Sdes return NULL; 841215116Sdes} 842215116Sdes 843215116Sdes/* Load private key and certificate */ 844215116SdesKey * 845215116Sdeskey_load_private_cert(int type, const char *filename, const char *passphrase, 846215116Sdes int *perm_ok) 847215116Sdes{ 848215116Sdes Key *key, *pub; 849215116Sdes 850215116Sdes switch (type) { 851215116Sdes case KEY_RSA: 852215116Sdes case KEY_DSA: 853221420Sdes case KEY_ECDSA: 854215116Sdes break; 855215116Sdes default: 856215116Sdes error("%s: unsupported key type", __func__); 857215116Sdes return NULL; 858215116Sdes } 859215116Sdes 860215116Sdes if ((key = key_load_private_type(type, filename, 861215116Sdes passphrase, NULL, perm_ok)) == NULL) 862215116Sdes return NULL; 863215116Sdes 864215116Sdes if ((pub = key_load_cert(filename)) == NULL) { 865215116Sdes key_free(key); 866215116Sdes return NULL; 867215116Sdes } 868215116Sdes 869215116Sdes /* Make sure the private key matches the certificate */ 870215116Sdes if (key_equal_public(key, pub) == 0) { 871215116Sdes error("%s: certificate does not match private key %s", 872215116Sdes __func__, filename); 873215116Sdes } else if (key_to_certified(key, key_cert_is_legacy(pub)) != 0) { 874215116Sdes error("%s: key_to_certified failed", __func__); 875215116Sdes } else { 876215116Sdes key_cert_copy(pub, key); 877215116Sdes key_free(pub); 878215116Sdes return key; 879215116Sdes } 880215116Sdes 881215116Sdes key_free(key); 882215116Sdes key_free(pub); 883215116Sdes return NULL; 884215116Sdes} 885215116Sdes 886204917Sdes/* 887204917Sdes * Returns 1 if the specified "key" is listed in the file "filename", 888204917Sdes * 0 if the key is not listed or -1 on error. 889204917Sdes * If strict_type is set then the key type must match exactly, 890204917Sdes * otherwise a comparison that ignores certficiate data is performed. 891204917Sdes */ 892204917Sdesint 893204917Sdeskey_in_file(Key *key, const char *filename, int strict_type) 894204917Sdes{ 895204917Sdes FILE *f; 896204917Sdes char line[SSH_MAX_PUBKEY_BYTES]; 897204917Sdes char *cp; 898204917Sdes u_long linenum = 0; 899204917Sdes int ret = 0; 900204917Sdes Key *pub; 901204917Sdes int (*key_compare)(const Key *, const Key *) = strict_type ? 902204917Sdes key_equal : key_equal_public; 903204917Sdes 904204917Sdes if ((f = fopen(filename, "r")) == NULL) { 905204917Sdes if (errno == ENOENT) { 906204917Sdes debug("%s: keyfile \"%s\" missing", __func__, filename); 907204917Sdes return 0; 908204917Sdes } else { 909204917Sdes error("%s: could not open keyfile \"%s\": %s", __func__, 910204917Sdes filename, strerror(errno)); 911204917Sdes return -1; 912204917Sdes } 913204917Sdes } 914204917Sdes 915204917Sdes while (read_keyfile_line(f, filename, line, sizeof(line), 916204917Sdes &linenum) != -1) { 917204917Sdes cp = line; 918204917Sdes 919204917Sdes /* Skip leading whitespace. */ 920204917Sdes for (; *cp && (*cp == ' ' || *cp == '\t'); cp++) 921204917Sdes ; 922204917Sdes 923204917Sdes /* Skip comments and empty lines */ 924204917Sdes switch (*cp) { 925204917Sdes case '#': 926204917Sdes case '\n': 927204917Sdes case '\0': 928204917Sdes continue; 929204917Sdes } 930204917Sdes 931204917Sdes pub = key_new(KEY_UNSPEC); 932204917Sdes if (key_read(pub, &cp) != 1) { 933204917Sdes key_free(pub); 934204917Sdes continue; 935204917Sdes } 936204917Sdes if (key_compare(key, pub)) { 937204917Sdes ret = 1; 938204917Sdes key_free(pub); 939204917Sdes break; 940204917Sdes } 941204917Sdes key_free(pub); 942204917Sdes } 943204917Sdes fclose(f); 944204917Sdes return ret; 945204917Sdes} 946204917Sdes 947