+/* $OpenBSD: authfile.c,v 1.79 2010/01/12 00:16:47 dtucker Exp $ */
/*
+ * Author: Tatu Ylonen <ylo@cs.hut.fi>
+ * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
+ * All rights reserved
+ * This file contains functions for reading and writing identity files, and
+ * for reading the passphrase from the user.
+ *
+ * As far as I am concerned, the code I have written for this software
+ * can be used freely for any purpose. Any derived versions of this
+ * software must be clearly marked as such, and if the derived work is
+ * incompatible with the protocol description in the RFC file, it must be
+ * called by a name other than "ssh" or "Secure Shell".
+ *
+ *
+ * Copyright (c) 2000 Markus Friedl. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
-authfile.c
-
-Author: Tatu Ylonen <ylo@cs.hut.fi>
-
-Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
- All rights reserved
+#include "includes.h"
-Created: Mon Mar 27 03:52:05 1995 ylo
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/param.h>
+#include <sys/uio.h>
-This file contains functions for reading and writing identity files, and
-for reading the passphrase from the user.
+#include <openssl/err.h>
+#include <openssl/evp.h>
+#include <openssl/pem.h>
-*/
+/* compatibility with old or broken OpenSSL versions */
+#include "openbsd-compat/openssl-compat.h"
-#include "includes.h"
-RCSID("$Id$");
-
-#ifdef HAVE_OPENSSL
-#include <openssl/bn.h>
-#endif
-#ifdef HAVE_SSL
-#include <ssl/bn.h>
-#endif
+#include <errno.h>
+#include <fcntl.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
#include "xmalloc.h"
-#include "buffer.h"
-#include "bufaux.h"
#include "cipher.h"
+#include "buffer.h"
+#include "key.h"
#include "ssh.h"
+#include "log.h"
+#include "authfile.h"
+#include "rsa.h"
+#include "misc.h"
+#include "atomicio.h"
+
+/* Version identification string for SSH v1 identity files. */
+static const char authfile_id_string[] =
+ "SSH PRIVATE KEY FILE FORMAT 1.1\n";
+
+/*
+ * Saves the authentication (private) key in a file, encrypting it with
+ * passphrase. The identification of the file (lowest 64 bits of n) will
+ * precede the key to provide identification of the key without needing a
+ * passphrase.
+ */
+
+static int
+key_save_private_rsa1(Key *key, const char *filename, const char *passphrase,
+ const char *comment)
+{
+ Buffer buffer, encrypted;
+ u_char buf[100], *cp;
+ int fd, i, cipher_num;
+ CipherContext ciphercontext;
+ Cipher *cipher;
+ u_int32_t rnd;
+
+ /*
+ * If the passphrase is empty, use SSH_CIPHER_NONE to ease converting
+ * to another cipher; otherwise use SSH_AUTHFILE_CIPHER.
+ */
+ cipher_num = (strcmp(passphrase, "") == 0) ?
+ SSH_CIPHER_NONE : SSH_AUTHFILE_CIPHER;
+ if ((cipher = cipher_by_number(cipher_num)) == NULL)
+ fatal("save_private_key_rsa: bad cipher");
+
+ /* This buffer is used to built the secret part of the private key. */
+ buffer_init(&buffer);
+
+ /* Put checkbytes for checking passphrase validity. */
+ rnd = arc4random();
+ buf[0] = rnd & 0xff;
+ buf[1] = (rnd >> 8) & 0xff;
+ buf[2] = buf[0];
+ buf[3] = buf[1];
+ buffer_append(&buffer, buf, 4);
+
+ /*
+ * Store the private key (n and e will not be stored because they
+ * will be stored in plain text, and storing them also in encrypted
+ * format would just give known plaintext).
+ */
+ buffer_put_bignum(&buffer, key->rsa->d);
+ buffer_put_bignum(&buffer, key->rsa->iqmp);
+ buffer_put_bignum(&buffer, key->rsa->q); /* reverse from SSL p */
+ buffer_put_bignum(&buffer, key->rsa->p); /* reverse from SSL q */
+
+ /* Pad the part to be encrypted until its size is a multiple of 8. */
+ while (buffer_len(&buffer) % 8 != 0)
+ buffer_put_char(&buffer, 0);
+
+ /* This buffer will be used to contain the data in the file. */
+ buffer_init(&encrypted);
+
+ /* First store keyfile id string. */
+ for (i = 0; authfile_id_string[i]; i++)
+ buffer_put_char(&encrypted, authfile_id_string[i]);
+ buffer_put_char(&encrypted, 0);
+
+ /* Store cipher type. */
+ buffer_put_char(&encrypted, cipher_num);
+ buffer_put_int(&encrypted, 0); /* For future extension */
+
+ /* Store public key. This will be in plain text. */
+ buffer_put_int(&encrypted, BN_num_bits(key->rsa->n));
+ buffer_put_bignum(&encrypted, key->rsa->n);
+ buffer_put_bignum(&encrypted, key->rsa->e);
+ buffer_put_cstring(&encrypted, comment);
+
+ /* Allocate space for the private part of the key in the buffer. */
+ cp = buffer_append_space(&encrypted, buffer_len(&buffer));
+
+ cipher_set_key_string(&ciphercontext, cipher, passphrase,
+ CIPHER_ENCRYPT);
+ cipher_crypt(&ciphercontext, cp,
+ buffer_ptr(&buffer), buffer_len(&buffer));
+ cipher_cleanup(&ciphercontext);
+ memset(&ciphercontext, 0, sizeof(ciphercontext));
+
+ /* Destroy temporary data. */
+ memset(buf, 0, sizeof(buf));
+ buffer_free(&buffer);
-/* Version identification string for identity files. */
-#define AUTHFILE_ID_STRING "SSH PRIVATE KEY FILE FORMAT 1.1\n"
+ fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0600);
+ if (fd < 0) {
+ error("open %s failed: %s.", filename, strerror(errno));
+ buffer_free(&encrypted);
+ return 0;
+ }
+ if (atomicio(vwrite, fd, buffer_ptr(&encrypted),
+ buffer_len(&encrypted)) != buffer_len(&encrypted)) {
+ error("write to key file %s failed: %s", filename,
+ strerror(errno));
+ buffer_free(&encrypted);
+ close(fd);
+ unlink(filename);
+ return 0;
+ }
+ close(fd);
+ buffer_free(&encrypted);
+ return 1;
+}
-/* Saves the authentication (private) key in a file, encrypting it with
- passphrase. The identification of the file (lowest 64 bits of n)
- will precede the key to provide identification of the key without
- needing a passphrase. */
+/* save SSH v2 key in OpenSSL PEM format */
+static int
+key_save_private_pem(Key *key, const char *filename, const char *_passphrase,
+ const char *comment)
+{
+ FILE *fp;
+ int fd;
+ int success = 0;
+ int len = strlen(_passphrase);
+ u_char *passphrase = (len > 0) ? (u_char *)_passphrase : NULL;
+#if (OPENSSL_VERSION_NUMBER < 0x00907000L)
+ const EVP_CIPHER *cipher = (len > 0) ? EVP_des_ede3_cbc() : NULL;
+#else
+ const EVP_CIPHER *cipher = (len > 0) ? EVP_aes_128_cbc() : NULL;
+#endif
+
+ if (len > 0 && len <= 4) {
+ error("passphrase too short: have %d bytes, need > 4", len);
+ return 0;
+ }
+ fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0600);
+ if (fd < 0) {
+ error("open %s failed: %s.", filename, strerror(errno));
+ return 0;
+ }
+ fp = fdopen(fd, "w");
+ if (fp == NULL) {
+ error("fdopen %s failed: %s.", filename, strerror(errno));
+ close(fd);
+ return 0;
+ }
+ switch (key->type) {
+ case KEY_DSA:
+ success = PEM_write_DSAPrivateKey(fp, key->dsa,
+ cipher, passphrase, len, NULL, NULL);
+ break;
+ case KEY_RSA:
+ success = PEM_write_RSAPrivateKey(fp, key->rsa,
+ cipher, passphrase, len, NULL, NULL);
+ break;
+ }
+ fclose(fp);
+ return success;
+}
int
-save_private_key(const char *filename, const char *passphrase,
- RSA *key, const char *comment)
+key_save_private(Key *key, const char *filename, const char *passphrase,
+ const char *comment)
{
- Buffer buffer, encrypted;
- char buf[100], *cp;
- int f, i;
- CipherContext cipher;
- int cipher_type;
- u_int32_t rand;
-
- /* If the passphrase is empty, use SSH_CIPHER_NONE to ease converting to
- another cipher; otherwise use SSH_AUTHFILE_CIPHER. */
- if (strcmp(passphrase, "") == 0)
- cipher_type = SSH_CIPHER_NONE;
- else
- cipher_type = SSH_AUTHFILE_CIPHER;
-
- /* This buffer is used to built the secret part of the private key. */
- buffer_init(&buffer);
-
- /* Put checkbytes for checking passphrase validity. */
- rand = arc4random();
- buf[0] = rand & 0xff;
- buf[1] = (rand >> 8) & 0xff;
- buf[2] = buf[0];
- buf[3] = buf[1];
- buffer_append(&buffer, buf, 4);
-
- /* Store the private key (n and e will not be stored because they will
- be stored in plain text, and storing them also in encrypted format
- would just give known plaintext). */
- buffer_put_bignum(&buffer, key->d);
- buffer_put_bignum(&buffer, key->iqmp);
- buffer_put_bignum(&buffer, key->q); /* reverse from SSL p */
- buffer_put_bignum(&buffer, key->p); /* reverse from SSL q */
-
- /* Pad the part to be encrypted until its size is a multiple of 8. */
- while (buffer_len(&buffer) % 8 != 0)
- buffer_put_char(&buffer, 0);
-
- /* This buffer will be used to contain the data in the file. */
- buffer_init(&encrypted);
-
- /* First store keyfile id string. */
- cp = AUTHFILE_ID_STRING;
- for (i = 0; cp[i]; i++)
- buffer_put_char(&encrypted, cp[i]);
- buffer_put_char(&encrypted, 0);
-
- /* Store cipher type. */
- buffer_put_char(&encrypted, cipher_type);
- buffer_put_int(&encrypted, 0); /* For future extension */
-
- /* Store public key. This will be in plain text. */
- buffer_put_int(&encrypted, BN_num_bits(key->n));
- buffer_put_bignum(&encrypted, key->n);
- buffer_put_bignum(&encrypted, key->e);
- buffer_put_string(&encrypted, comment, strlen(comment));
-
- /* Allocate space for the private part of the key in the buffer. */
- buffer_append_space(&encrypted, &cp, buffer_len(&buffer));
-
- cipher_set_key_string(&cipher, cipher_type, passphrase, 1);
- cipher_encrypt(&cipher, (unsigned char *)cp,
- (unsigned char *)buffer_ptr(&buffer),
- buffer_len(&buffer));
- memset(&cipher, 0, sizeof(cipher));
-
- /* Destroy temporary data. */
- memset(buf, 0, sizeof(buf));
- buffer_free(&buffer);
-
- /* Write to a file. */
- f = open(filename, O_WRONLY|O_CREAT|O_TRUNC, 0600);
- if (f < 0)
- return 0;
-
- if (write(f, buffer_ptr(&encrypted), buffer_len(&encrypted)) !=
- buffer_len(&encrypted))
- {
- debug("Write to key file %.200s failed: %.100s", filename,
- strerror(errno));
- buffer_free(&encrypted);
- close(f);
- remove(filename);
- return 0;
- }
- close(f);
- buffer_free(&encrypted);
- return 1;
+ switch (key->type) {
+ case KEY_RSA1:
+ return key_save_private_rsa1(key, filename, passphrase,
+ comment);
+ case KEY_DSA:
+ case KEY_RSA:
+ return key_save_private_pem(key, filename, passphrase,
+ comment);
+ default:
+ break;
+ }
+ error("key_save_private: cannot save key type %d", key->type);
+ return 0;
}
-/* Loads the public part of the key file. Returns 0 if an error
- was encountered (the file does not exist or is not readable), and
- non-zero otherwise. */
+/*
+ * Loads the public part of the ssh v1 key file. Returns NULL if an error was
+ * encountered (the file does not exist or is not readable), and the key
+ * otherwise.
+ */
-int
-load_public_key(const char *filename, RSA *pub,
- char **comment_return)
+static Key *
+key_load_public_rsa1(int fd, const char *filename, char **commentp)
{
- int f, i;
- off_t len;
- Buffer buffer;
- char *cp;
-
- /* Read data from the file into the buffer. */
- f = open(filename, O_RDONLY);
- if (f < 0)
- return 0;
-
- len = lseek(f, (off_t)0, SEEK_END);
- lseek(f, (off_t)0, SEEK_SET);
-
- buffer_init(&buffer);
- buffer_append_space(&buffer, &cp, len);
-
- if (read(f, cp, (size_t)len) != (size_t)len)
- {
- debug("Read from key file %.200s failed: %.100s", filename,
- strerror(errno));
- buffer_free(&buffer);
- close(f);
- return 0;
- }
- close(f);
-
- /* Check that it is at least big enought to contain the ID string. */
- if (len < strlen(AUTHFILE_ID_STRING) + 1)
- {
- debug("Bad key file %.200s.", filename);
- buffer_free(&buffer);
- return 0;
- }
-
- /* Make sure it begins with the id string. Consume the id string from
- the buffer. */
- for (i = 0; i < (unsigned int)strlen(AUTHFILE_ID_STRING) + 1; i++)
- if (buffer_get_char(&buffer) != (unsigned char)AUTHFILE_ID_STRING[i])
- {
- debug("Bad key file %.200s.", filename);
+ Buffer buffer;
+ Key *pub;
+ struct stat st;
+ char *cp;
+ u_int i;
+ size_t len;
+
+ if (fstat(fd, &st) < 0) {
+ error("fstat for key file %.200s failed: %.100s",
+ filename, strerror(errno));
+ return NULL;
+ }
+ if (st.st_size > 1*1024*1024) {
+ error("key file %.200s too large", filename);
+ return NULL;
+ }
+ len = (size_t)st.st_size; /* truncated */
+
+ buffer_init(&buffer);
+ cp = buffer_append_space(&buffer, len);
+
+ if (atomicio(read, fd, cp, len) != len) {
+ debug("Read from key file %.200s failed: %.100s", filename,
+ strerror(errno));
+ buffer_free(&buffer);
+ return NULL;
+ }
+
+ /* Check that it is at least big enough to contain the ID string. */
+ if (len < sizeof(authfile_id_string)) {
+ debug3("Not a RSA1 key file %.200s.", filename);
+ buffer_free(&buffer);
+ return NULL;
+ }
+ /*
+ * Make sure it begins with the id string. Consume the id string
+ * from the buffer.
+ */
+ for (i = 0; i < sizeof(authfile_id_string); i++)
+ if (buffer_get_char(&buffer) != authfile_id_string[i]) {
+ debug3("Not a RSA1 key file %.200s.", filename);
+ buffer_free(&buffer);
+ return NULL;
+ }
+ /* Skip cipher type and reserved data. */
+ (void) buffer_get_char(&buffer); /* cipher type */
+ (void) buffer_get_int(&buffer); /* reserved */
+
+ /* Read the public key from the buffer. */
+ (void) buffer_get_int(&buffer);
+ pub = key_new(KEY_RSA1);
+ buffer_get_bignum(&buffer, pub->rsa->n);
+ buffer_get_bignum(&buffer, pub->rsa->e);
+ if (commentp)
+ *commentp = buffer_get_string(&buffer, NULL);
+ /* The encrypted private part is not parsed by this function. */
+
buffer_free(&buffer);
- return 0;
- }
-
- /* Skip cipher type and reserved data. */
- (void)buffer_get_char(&buffer); /* cipher type */
- (void)buffer_get_int(&buffer); /* reserved */
-
- /* Read the public key from the buffer. */
- buffer_get_int(&buffer);
- pub->n = BN_new();
- buffer_get_bignum(&buffer, pub->n);
- pub->e = BN_new();
- buffer_get_bignum(&buffer, pub->e);
- if (comment_return)
- *comment_return = buffer_get_string(&buffer, NULL);
- /* The encrypted private part is not parsed by this function. */
-
- buffer_free(&buffer);
-
- return 1;
+ return pub;
}
-/* Loads the private key from the file. Returns 0 if an error is encountered
- (file does not exist or is not readable, or passphrase is bad).
- This initializes the private key. */
+/* load public key from private-key file, works only for SSH v1 */
+Key *
+key_load_public_type(int type, const char *filename, char **commentp)
+{
+ Key *pub;
+ int fd;
+
+ if (type == KEY_RSA1) {
+ fd = open(filename, O_RDONLY);
+ if (fd < 0)
+ return NULL;
+ pub = key_load_public_rsa1(fd, filename, commentp);
+ close(fd);
+ return pub;
+ }
+ return NULL;
+}
-int
-load_private_key(const char *filename, const char *passphrase,
- RSA *prv, char **comment_return)
+/*
+ * Loads the private key from the file. Returns 0 if an error is encountered
+ * (file does not exist or is not readable, or passphrase is bad). This
+ * initializes the private key.
+ * Assumes we are called under uid of the owner of the file.
+ */
+
+static Key *
+key_load_private_rsa1(int fd, const char *filename, const char *passphrase,
+ char **commentp)
{
- int f, i, check1, check2, cipher_type;
- off_t len;
- Buffer buffer, decrypted;
- char *cp;
- CipherContext cipher;
- BN_CTX *ctx;
- BIGNUM *aux;
- struct stat st;
-
- /* Read the file into the buffer. */
- f = open(filename, O_RDONLY);
- if (f < 0)
- return 0;
-
- /* We assume we are called under uid of the owner of the file */
- if (fstat(f, &st) < 0 ||
- (st.st_uid != 0 && st.st_uid != getuid()) ||
- (st.st_mode & 077) != 0) {
- error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
- error("@ WARNING: UNPROTECTED PRIVATE KEY FILE! @");
- error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
- error("Bad ownership or mode(0%3.3o) for '%s'.",
- st.st_mode & 0777, filename);
- error("It is recommended that your private key files are NOT accessible by others.");
- return 0;
- }
-
- len = lseek(f, (off_t)0, SEEK_END);
- lseek(f, (off_t)0, SEEK_SET);
-
- buffer_init(&buffer);
- buffer_append_space(&buffer, &cp, len);
-
- if (read(f, cp, (size_t)len) != (size_t)len)
- {
- debug("Read from key file %.200s failed: %.100s", filename,
- strerror(errno));
- buffer_free(&buffer);
- close(f);
- return 0;
- }
- close(f);
-
- /* Check that it is at least big enought to contain the ID string. */
- if (len < strlen(AUTHFILE_ID_STRING) + 1)
- {
- debug("Bad key file %.200s.", filename);
- buffer_free(&buffer);
- return 0;
- }
-
- /* Make sure it begins with the id string. Consume the id string from
- the buffer. */
- for (i = 0; i < (unsigned int)strlen(AUTHFILE_ID_STRING) + 1; i++)
- if (buffer_get_char(&buffer) != (unsigned char)AUTHFILE_ID_STRING[i])
- {
- debug("Bad key file %.200s.", filename);
+ u_int i;
+ int check1, check2, cipher_type;
+ size_t len;
+ Buffer buffer, decrypted;
+ u_char *cp;
+ CipherContext ciphercontext;
+ Cipher *cipher;
+ Key *prv = NULL;
+ struct stat st;
+
+ if (fstat(fd, &st) < 0) {
+ error("fstat for key file %.200s failed: %.100s",
+ filename, strerror(errno));
+ close(fd);
+ return NULL;
+ }
+ if (st.st_size > 1*1024*1024) {
+ error("key file %.200s too large", filename);
+ close(fd);
+ return (NULL);
+ }
+ len = (size_t)st.st_size; /* truncated */
+
+ buffer_init(&buffer);
+ cp = buffer_append_space(&buffer, len);
+
+ if (atomicio(read, fd, cp, len) != len) {
+ debug("Read from key file %.200s failed: %.100s", filename,
+ strerror(errno));
+ buffer_free(&buffer);
+ close(fd);
+ return NULL;
+ }
+
+ /* Check that it is at least big enough to contain the ID string. */
+ if (len < sizeof(authfile_id_string)) {
+ debug3("Not a RSA1 key file %.200s.", filename);
+ buffer_free(&buffer);
+ close(fd);
+ return NULL;
+ }
+ /*
+ * Make sure it begins with the id string. Consume the id string
+ * from the buffer.
+ */
+ for (i = 0; i < sizeof(authfile_id_string); i++)
+ if (buffer_get_char(&buffer) != authfile_id_string[i]) {
+ debug3("Not a RSA1 key file %.200s.", filename);
+ buffer_free(&buffer);
+ close(fd);
+ return NULL;
+ }
+
+ /* Read cipher type. */
+ cipher_type = buffer_get_char(&buffer);
+ (void) buffer_get_int(&buffer); /* Reserved data. */
+
+ /* Read the public key from the buffer. */
+ (void) buffer_get_int(&buffer);
+ prv = key_new_private(KEY_RSA1);
+
+ buffer_get_bignum(&buffer, prv->rsa->n);
+ buffer_get_bignum(&buffer, prv->rsa->e);
+ if (commentp)
+ *commentp = buffer_get_string(&buffer, NULL);
+ else
+ xfree(buffer_get_string(&buffer, NULL));
+
+ /* Check that it is a supported cipher. */
+ cipher = cipher_by_number(cipher_type);
+ if (cipher == NULL) {
+ debug("Unsupported cipher %d used in key file %.200s.",
+ cipher_type, filename);
+ buffer_free(&buffer);
+ goto fail;
+ }
+ /* Initialize space for decrypted data. */
+ buffer_init(&decrypted);
+ cp = buffer_append_space(&decrypted, buffer_len(&buffer));
+
+ /* Rest of the buffer is encrypted. Decrypt it using the passphrase. */
+ cipher_set_key_string(&ciphercontext, cipher, passphrase,
+ CIPHER_DECRYPT);
+ cipher_crypt(&ciphercontext, cp,
+ buffer_ptr(&buffer), buffer_len(&buffer));
+ cipher_cleanup(&ciphercontext);
+ memset(&ciphercontext, 0, sizeof(ciphercontext));
buffer_free(&buffer);
+
+ check1 = buffer_get_char(&decrypted);
+ check2 = buffer_get_char(&decrypted);
+ if (check1 != buffer_get_char(&decrypted) ||
+ check2 != buffer_get_char(&decrypted)) {
+ if (strcmp(passphrase, "") != 0)
+ debug("Bad passphrase supplied for key file %.200s.",
+ filename);
+ /* Bad passphrase. */
+ buffer_free(&decrypted);
+ goto fail;
+ }
+ /* Read the rest of the private key. */
+ buffer_get_bignum(&decrypted, prv->rsa->d);
+ buffer_get_bignum(&decrypted, prv->rsa->iqmp); /* u */
+ /* in SSL and SSH v1 p and q are exchanged */
+ buffer_get_bignum(&decrypted, prv->rsa->q); /* p */
+ buffer_get_bignum(&decrypted, prv->rsa->p); /* q */
+
+ /* calculate p-1 and q-1 */
+ rsa_generate_additional_parameters(prv->rsa);
+
+ buffer_free(&decrypted);
+
+ /* enable blinding */
+ if (RSA_blinding_on(prv->rsa, NULL) != 1) {
+ error("key_load_private_rsa1: RSA_blinding_on failed");
+ goto fail;
+ }
+ close(fd);
+ return prv;
+
+fail:
+ if (commentp)
+ xfree(*commentp);
+ close(fd);
+ key_free(prv);
+ return NULL;
+}
+
+Key *
+key_load_private_pem(int fd, int type, const char *passphrase,
+ char **commentp)
+{
+ FILE *fp;
+ EVP_PKEY *pk = NULL;
+ Key *prv = NULL;
+ char *name = "<no key>";
+
+ fp = fdopen(fd, "r");
+ if (fp == NULL) {
+ error("fdopen failed: %s", strerror(errno));
+ close(fd);
+ return NULL;
+ }
+ pk = PEM_read_PrivateKey(fp, NULL, NULL, (char *)passphrase);
+ if (pk == NULL) {
+ debug("PEM_read_PrivateKey failed");
+ (void)ERR_get_error();
+ } else if (pk->type == EVP_PKEY_RSA &&
+ (type == KEY_UNSPEC||type==KEY_RSA)) {
+ prv = key_new(KEY_UNSPEC);
+ prv->rsa = EVP_PKEY_get1_RSA(pk);
+ prv->type = KEY_RSA;
+ name = "rsa w/o comment";
+#ifdef DEBUG_PK
+ RSA_print_fp(stderr, prv->rsa, 8);
+#endif
+ if (RSA_blinding_on(prv->rsa, NULL) != 1) {
+ error("key_load_private_pem: RSA_blinding_on failed");
+ key_free(prv);
+ prv = NULL;
+ }
+ } else if (pk->type == EVP_PKEY_DSA &&
+ (type == KEY_UNSPEC||type==KEY_DSA)) {
+ prv = key_new(KEY_UNSPEC);
+ prv->dsa = EVP_PKEY_get1_DSA(pk);
+ prv->type = KEY_DSA;
+ name = "dsa w/o comment";
+#ifdef DEBUG_PK
+ DSA_print_fp(stderr, prv->dsa, 8);
+#endif
+ } else {
+ error("PEM_read_PrivateKey: mismatch or "
+ "unknown EVP_PKEY save_type %d", pk->save_type);
+ }
+ fclose(fp);
+ if (pk != NULL)
+ EVP_PKEY_free(pk);
+ if (prv != NULL && commentp)
+ *commentp = xstrdup(name);
+ debug("read PEM private key done: type %s",
+ prv ? key_type(prv) : "<unknown>");
+ return prv;
+}
+
+int
+key_perm_ok(int fd, const char *filename)
+{
+ struct stat st;
+
+ if (fstat(fd, &st) < 0)
+ return 0;
+ /*
+ * if a key owned by the user is accessed, then we check the
+ * permissions of the file. if the key owned by a different user,
+ * then we don't care.
+ */
+#ifdef HAVE_CYGWIN
+ if (check_ntsec(filename))
+#endif
+ if ((st.st_uid == getuid()) && (st.st_mode & 077) != 0) {
+ error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
+ error("@ WARNING: UNPROTECTED PRIVATE KEY FILE! @");
+ error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
+ error("Permissions 0%3.3o for '%s' are too open.",
+ (u_int)st.st_mode & 0777, filename);
+ error("It is recommended that your private key files are NOT accessible by others.");
+ error("This private key will be ignored.");
+ return 0;
+ }
+ return 1;
+}
+
+Key *
+key_load_private_type(int type, const char *filename, const char *passphrase,
+ char **commentp, int *perm_ok)
+{
+ int fd;
+
+ fd = open(filename, O_RDONLY);
+ if (fd < 0) {
+ debug("could not open key file '%s': %s", filename,
+ strerror(errno));
+ if (perm_ok != NULL)
+ *perm_ok = 0;
+ return NULL;
+ }
+ if (!key_perm_ok(fd, filename)) {
+ if (perm_ok != NULL)
+ *perm_ok = 0;
+ error("bad permissions: ignore key: %s", filename);
+ close(fd);
+ return NULL;
+ }
+ if (perm_ok != NULL)
+ *perm_ok = 1;
+ switch (type) {
+ case KEY_RSA1:
+ return key_load_private_rsa1(fd, filename, passphrase,
+ commentp);
+ /* closes fd */
+ case KEY_DSA:
+ case KEY_RSA:
+ case KEY_UNSPEC:
+ return key_load_private_pem(fd, type, passphrase, commentp);
+ /* closes fd */
+ default:
+ close(fd);
+ break;
+ }
+ return NULL;
+}
+
+Key *
+key_load_private(const char *filename, const char *passphrase,
+ char **commentp)
+{
+ Key *pub, *prv;
+ int fd;
+
+ fd = open(filename, O_RDONLY);
+ if (fd < 0) {
+ debug("could not open key file '%s': %s", filename,
+ strerror(errno));
+ return NULL;
+ }
+ if (!key_perm_ok(fd, filename)) {
+ error("bad permissions: ignore key: %s", filename);
+ close(fd);
+ return NULL;
+ }
+ pub = key_load_public_rsa1(fd, filename, commentp);
+ lseek(fd, (off_t) 0, SEEK_SET); /* rewind */
+ if (pub == NULL) {
+ /* closes fd */
+ prv = key_load_private_pem(fd, KEY_UNSPEC, passphrase, NULL);
+ /* use the filename as a comment for PEM */
+ if (commentp && prv)
+ *commentp = xstrdup(filename);
+ } else {
+ /* it's a SSH v1 key if the public key part is readable */
+ key_free(pub);
+ /* closes fd */
+ prv = key_load_private_rsa1(fd, filename, passphrase, NULL);
+ }
+ return prv;
+}
+
+static int
+key_try_load_public(Key *k, const char *filename, char **commentp)
+{
+ FILE *f;
+ char line[SSH_MAX_PUBKEY_BYTES];
+ char *cp;
+ u_long linenum = 0;
+
+ f = fopen(filename, "r");
+ if (f != NULL) {
+ while (read_keyfile_line(f, filename, line, sizeof(line),
+ &linenum) != -1) {
+ cp = line;
+ switch (*cp) {
+ case '#':
+ case '\n':
+ case '\0':
+ continue;
+ }
+ /* Skip leading whitespace. */
+ for (; *cp && (*cp == ' ' || *cp == '\t'); cp++)
+ ;
+ if (*cp) {
+ if (key_read(k, &cp) == 1) {
+ if (commentp)
+ *commentp=xstrdup(filename);
+ fclose(f);
+ return 1;
+ }
+ }
+ }
+ fclose(f);
+ }
return 0;
- }
-
- /* Read cipher type. */
- cipher_type = buffer_get_char(&buffer);
- (void)buffer_get_int(&buffer); /* Reserved data. */
-
- /* Read the public key from the buffer. */
- buffer_get_int(&buffer);
- prv->n = BN_new();
- buffer_get_bignum(&buffer, prv->n);
- prv->e = BN_new();
- buffer_get_bignum(&buffer, prv->e);
- if (comment_return)
- *comment_return = buffer_get_string(&buffer, NULL);
- else
- xfree(buffer_get_string(&buffer, NULL));
-
- /* Check that it is a supported cipher. */
- if (((cipher_mask() | SSH_CIPHER_NONE | SSH_AUTHFILE_CIPHER) &
- (1 << cipher_type)) == 0)
- {
- debug("Unsupported cipher %.100s used in key file %.200s.",
- cipher_name(cipher_type), filename);
- buffer_free(&buffer);
- goto fail;
- }
-
- /* Initialize space for decrypted data. */
- buffer_init(&decrypted);
- buffer_append_space(&decrypted, &cp, buffer_len(&buffer));
-
- /* Rest of the buffer is encrypted. Decrypt it using the passphrase. */
- cipher_set_key_string(&cipher, cipher_type, passphrase, 0);
- cipher_decrypt(&cipher, (unsigned char *)cp,
- (unsigned char *)buffer_ptr(&buffer),
- buffer_len(&buffer));
-
- buffer_free(&buffer);
-
- check1 = buffer_get_char(&decrypted);
- check2 = buffer_get_char(&decrypted);
- if (check1 != buffer_get_char(&decrypted) ||
- check2 != buffer_get_char(&decrypted))
- {
- if (strcmp(passphrase, "") != 0)
- debug("Bad passphrase supplied for key file %.200s.", filename);
- /* Bad passphrase. */
- buffer_free(&decrypted);
- fail:
- BN_clear_free(prv->n);
- BN_clear_free(prv->e);
- if (comment_return)
- xfree(*comment_return);
- return 0;
- }
-
- /* Read the rest of the private key. */
- prv->d = BN_new();
- buffer_get_bignum(&decrypted, prv->d);
- prv->iqmp = BN_new();
- buffer_get_bignum(&decrypted, prv->iqmp); /* u */
- /* in SSL and SSH p and q are exchanged */
- prv->q = BN_new();
- buffer_get_bignum(&decrypted, prv->q); /* p */
- prv->p = BN_new();
- buffer_get_bignum(&decrypted, prv->p); /* q */
-
- ctx = BN_CTX_new();
- aux = BN_new();
-
- BN_sub(aux, prv->q, BN_value_one());
- prv->dmq1 = BN_new();
- BN_mod(prv->dmq1, prv->d, aux, ctx);
-
- BN_sub(aux, prv->p, BN_value_one());
- prv->dmp1 = BN_new();
- BN_mod(prv->dmp1, prv->d, aux, ctx);
-
- BN_clear_free(aux);
- BN_CTX_free(ctx);
-
- buffer_free(&decrypted);
-
- return 1;
+}
+
+/* load public key from ssh v1 private or any pubkey file */
+Key *
+key_load_public(const char *filename, char **commentp)
+{
+ Key *pub;
+ char file[MAXPATHLEN];
+
+ /* try rsa1 private key */
+ pub = key_load_public_type(KEY_RSA1, filename, commentp);
+ if (pub != NULL)
+ return pub;
+
+ /* try rsa1 public key */
+ pub = key_new(KEY_RSA1);
+ if (key_try_load_public(pub, filename, commentp) == 1)
+ return pub;
+ key_free(pub);
+
+ /* try ssh2 public key */
+ pub = key_new(KEY_UNSPEC);
+ if (key_try_load_public(pub, filename, commentp) == 1)
+ return pub;
+ if ((strlcpy(file, filename, sizeof file) < sizeof(file)) &&
+ (strlcat(file, ".pub", sizeof file) < sizeof(file)) &&
+ (key_try_load_public(pub, file, commentp) == 1))
+ return pub;
+ key_free(pub);
+ return NULL;
}
andersk / openssh.git / blobdiff