version 1.20, 2000/10/11 20:27:23 |
version 1.20.2.3, 2001/03/21 19:46:23 |
|
|
#include "includes.h" |
#include "includes.h" |
RCSID("$OpenBSD$"); |
RCSID("$OpenBSD$"); |
|
|
#include <openssl/bn.h> |
#include <openssl/err.h> |
#include <openssl/dsa.h> |
|
#include <openssl/rsa.h> |
|
#include <openssl/pem.h> |
|
#include <openssl/evp.h> |
#include <openssl/evp.h> |
|
#include <openssl/pem.h> |
|
|
|
#include "cipher.h" |
#include "xmalloc.h" |
#include "xmalloc.h" |
#include "buffer.h" |
#include "buffer.h" |
#include "bufaux.h" |
#include "bufaux.h" |
#include "ssh.h" |
|
#include "key.h" |
#include "key.h" |
|
#include "ssh.h" |
|
#include "log.h" |
|
#include "authfile.h" |
|
|
/* Version identification string for identity files. */ |
/* Version identification string for identity files. */ |
#define AUTHFILE_ID_STRING "SSH PRIVATE KEY FILE FORMAT 1.1\n" |
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 |
* Saves the authentication (private) key in a file, encrypting it with |
|
|
*/ |
*/ |
|
|
int |
int |
save_private_key_rsa(const char *filename, const char *passphrase, |
save_private_key_rsa1(const char *filename, const char *passphrase, |
RSA *key, const char *comment) |
RSA *key, const char *comment) |
{ |
{ |
Buffer buffer, encrypted; |
Buffer buffer, encrypted; |
|
|
buffer_init(&encrypted); |
buffer_init(&encrypted); |
|
|
/* First store keyfile id string. */ |
/* First store keyfile id string. */ |
cp = AUTHFILE_ID_STRING; |
for (i = 0; authfile_id_string[i]; i++) |
for (i = 0; cp[i]; i++) |
buffer_put_char(&encrypted, authfile_id_string[i]); |
buffer_put_char(&encrypted, cp[i]); |
|
buffer_put_char(&encrypted, 0); |
buffer_put_char(&encrypted, 0); |
|
|
/* Store cipher type. */ |
/* Store cipher type. */ |
|
|
buffer_append_space(&encrypted, &cp, buffer_len(&buffer)); |
buffer_append_space(&encrypted, &cp, buffer_len(&buffer)); |
|
|
cipher_set_key_string(&ciphercontext, cipher, passphrase); |
cipher_set_key_string(&ciphercontext, cipher, passphrase); |
cipher_encrypt(&ciphercontext, (unsigned char *) cp, |
cipher_encrypt(&ciphercontext, (u_char *) cp, |
(unsigned char *) buffer_ptr(&buffer), buffer_len(&buffer)); |
(u_char *) buffer_ptr(&buffer), buffer_len(&buffer)); |
memset(&ciphercontext, 0, sizeof(ciphercontext)); |
memset(&ciphercontext, 0, sizeof(ciphercontext)); |
|
|
/* Destroy temporary data. */ |
/* Destroy temporary data. */ |
|
|
strerror(errno)); |
strerror(errno)); |
buffer_free(&encrypted); |
buffer_free(&encrypted); |
close(fd); |
close(fd); |
remove(filename); |
unlink(filename); |
return 0; |
return 0; |
} |
} |
close(fd); |
close(fd); |
|
|
return 1; |
return 1; |
} |
} |
|
|
/* save DSA key in OpenSSL PEM format */ |
/* save SSH2 key in OpenSSL PEM format */ |
|
|
int |
int |
save_private_key_dsa(const char *filename, const char *passphrase, |
save_private_key_ssh2(const char *filename, const char *_passphrase, |
DSA *dsa, const char *comment) |
Key *key, const char *comment) |
{ |
{ |
FILE *fp; |
FILE *fp; |
int fd; |
int fd; |
int success = 1; |
int success = 0; |
int len = strlen(passphrase); |
int len = strlen(_passphrase); |
|
char *passphrase = (len > 0) ? (char *)_passphrase : NULL; |
|
EVP_CIPHER *cipher = (len > 0) ? EVP_des_ede3_cbc() : NULL; |
|
|
if (len > 0 && len <= 4) { |
if (len > 0 && len <= 4) { |
error("passphrase too short: %d bytes", len); |
error("passphrase too short: %d bytes", len); |
|
|
close(fd); |
close(fd); |
return 0; |
return 0; |
} |
} |
if (len > 0) { |
switch (key->type) { |
if (!PEM_write_DSAPrivateKey(fp, dsa, EVP_des_ede3_cbc(), |
case KEY_DSA: |
(char *)passphrase, strlen(passphrase), NULL, NULL)) |
success = PEM_write_DSAPrivateKey(fp, key->dsa, |
success = 0; |
cipher, passphrase, len, NULL, NULL); |
} else { |
break; |
if (!PEM_write_DSAPrivateKey(fp, dsa, NULL, |
case KEY_RSA: |
NULL, 0, NULL, NULL)) |
success = PEM_write_RSAPrivateKey(fp, key->rsa, |
success = 0; |
cipher, passphrase, len, NULL, NULL); |
|
break; |
} |
} |
fclose(fp); |
fclose(fp); |
return success; |
return success; |
|
|
const char *comment) |
const char *comment) |
{ |
{ |
switch (key->type) { |
switch (key->type) { |
case KEY_RSA: |
case KEY_RSA1: |
return save_private_key_rsa(filename, passphrase, key->rsa, comment); |
return save_private_key_rsa1(filename, passphrase, key->rsa, comment); |
break; |
break; |
case KEY_DSA: |
case KEY_DSA: |
return save_private_key_dsa(filename, passphrase, key->dsa, comment); |
case KEY_RSA: |
|
return save_private_key_ssh2(filename, passphrase, key, comment); |
break; |
break; |
default: |
default: |
break; |
break; |
|
|
} |
} |
close(fd); |
close(fd); |
|
|
/* Check that it is at least big enought to contain the ID string. */ |
/* Check that it is at least big enough to contain the ID string. */ |
if (len < strlen(AUTHFILE_ID_STRING) + 1) { |
if (len < sizeof(authfile_id_string)) { |
debug("Bad key file %.200s.", filename); |
debug3("Bad RSA1 key file %.200s.", filename); |
buffer_free(&buffer); |
buffer_free(&buffer); |
return 0; |
return 0; |
} |
} |
|
|
* Make sure it begins with the id string. Consume the id string |
* Make sure it begins with the id string. Consume the id string |
* from the buffer. |
* from the buffer. |
*/ |
*/ |
for (i = 0; i < (unsigned int) strlen(AUTHFILE_ID_STRING) + 1; i++) |
for (i = 0; i < sizeof(authfile_id_string); i++) |
if (buffer_get_char(&buffer) != (u_char) AUTHFILE_ID_STRING[i]) { |
if (buffer_get_char(&buffer) != authfile_id_string[i]) { |
debug("Bad key file %.200s.", filename); |
debug3("Bad RSA1 key file %.200s.", filename); |
buffer_free(&buffer); |
buffer_free(&buffer); |
return 0; |
return 0; |
} |
} |
|
|
load_public_key(const char *filename, Key * key, char **comment_return) |
load_public_key(const char *filename, Key * key, char **comment_return) |
{ |
{ |
switch (key->type) { |
switch (key->type) { |
case KEY_RSA: |
case KEY_RSA1: |
return load_public_key_rsa(filename, key->rsa, comment_return); |
return load_public_key_rsa(filename, key->rsa, comment_return); |
break; |
break; |
case KEY_DSA: |
case KEY_DSA: |
|
case KEY_RSA: |
default: |
default: |
break; |
break; |
} |
} |
|
|
*/ |
*/ |
|
|
int |
int |
load_private_key_rsa(int fd, const char *filename, |
load_private_key_rsa1(int fd, const char *filename, |
const char *passphrase, RSA * prv, char **comment_return) |
const char *passphrase, RSA * prv, char **comment_return) |
{ |
{ |
int i, check1, check2, cipher_type; |
int i, check1, check2, cipher_type; |
|
|
|
|
if (read(fd, cp, (size_t) len) != (size_t) len) { |
if (read(fd, cp, (size_t) len) != (size_t) len) { |
debug("Read from key file %.200s failed: %.100s", filename, |
debug("Read from key file %.200s failed: %.100s", filename, |
strerror(errno)); |
strerror(errno)); |
buffer_free(&buffer); |
buffer_free(&buffer); |
close(fd); |
close(fd); |
return 0; |
return 0; |
} |
} |
close(fd); |
|
|
|
/* Check that it is at least big enought to contain the ID string. */ |
/* Check that it is at least big enough to contain the ID string. */ |
if (len < strlen(AUTHFILE_ID_STRING) + 1) { |
if (len < sizeof(authfile_id_string)) { |
debug("Bad key file %.200s.", filename); |
debug3("Bad RSA1 key file %.200s.", filename); |
buffer_free(&buffer); |
buffer_free(&buffer); |
|
close(fd); |
return 0; |
return 0; |
} |
} |
/* |
/* |
* Make sure it begins with the id string. Consume the id string |
* Make sure it begins with the id string. Consume the id string |
* from the buffer. |
* from the buffer. |
*/ |
*/ |
for (i = 0; i < (unsigned int) strlen(AUTHFILE_ID_STRING) + 1; i++) |
for (i = 0; i < sizeof(authfile_id_string); i++) |
if (buffer_get_char(&buffer) != (unsigned char) AUTHFILE_ID_STRING[i]) { |
if (buffer_get_char(&buffer) != authfile_id_string[i]) { |
debug("Bad key file %.200s.", filename); |
debug3("Bad RSA1 key file %.200s.", filename); |
buffer_free(&buffer); |
buffer_free(&buffer); |
|
close(fd); |
return 0; |
return 0; |
} |
} |
|
|
/* Read cipher type. */ |
/* Read cipher type. */ |
cipher_type = buffer_get_char(&buffer); |
cipher_type = buffer_get_char(&buffer); |
(void) buffer_get_int(&buffer); /* Reserved data. */ |
(void) buffer_get_int(&buffer); /* Reserved data. */ |
|
|
|
|
/* Rest of the buffer is encrypted. Decrypt it using the passphrase. */ |
/* Rest of the buffer is encrypted. Decrypt it using the passphrase. */ |
cipher_set_key_string(&ciphercontext, cipher, passphrase); |
cipher_set_key_string(&ciphercontext, cipher, passphrase); |
cipher_decrypt(&ciphercontext, (unsigned char *) cp, |
cipher_decrypt(&ciphercontext, (u_char *) cp, |
(unsigned char *) buffer_ptr(&buffer), buffer_len(&buffer)); |
(u_char *) buffer_ptr(&buffer), buffer_len(&buffer)); |
memset(&ciphercontext, 0, sizeof(ciphercontext)); |
memset(&ciphercontext, 0, sizeof(ciphercontext)); |
buffer_free(&buffer); |
buffer_free(&buffer); |
|
|
|
|
prv->e = NULL; |
prv->e = NULL; |
if (comment_return) |
if (comment_return) |
xfree(*comment_return); |
xfree(*comment_return); |
|
close(fd); |
return 0; |
return 0; |
} |
} |
/* Read the rest of the private key. */ |
/* Read the rest of the private key. */ |
|
|
BN_CTX_free(ctx); |
BN_CTX_free(ctx); |
|
|
buffer_free(&decrypted); |
buffer_free(&decrypted); |
|
close(fd); |
return 1; |
return 1; |
} |
} |
|
|
int |
int |
load_private_key_dsa(int fd, const char *passphrase, Key *k, char **comment_return) |
load_private_key_ssh2(int fd, const char *passphrase, Key *k, char **comment_return) |
{ |
{ |
DSA *dsa; |
|
BIO *in; |
|
FILE *fp; |
FILE *fp; |
|
int success = 0; |
|
EVP_PKEY *pk = NULL; |
|
char *name = "<no key>"; |
|
|
in = BIO_new(BIO_s_file()); |
|
if (in == NULL) { |
|
error("BIO_new failed"); |
|
return 0; |
|
} |
|
fp = fdopen(fd, "r"); |
fp = fdopen(fd, "r"); |
if (fp == NULL) { |
if (fp == NULL) { |
error("fdopen failed"); |
error("fdopen failed"); |
|
close(fd); |
return 0; |
return 0; |
} |
} |
BIO_set_fp(in, fp, BIO_NOCLOSE); |
pk = PEM_read_PrivateKey(fp, NULL, NULL, (char *)passphrase); |
dsa = PEM_read_bio_DSAPrivateKey(in, NULL, NULL, (char *)passphrase); |
if (pk == NULL) { |
if (dsa == NULL) { |
debug("PEM_read_PrivateKey failed"); |
debug("PEM_read_bio_DSAPrivateKey failed"); |
(void)ERR_get_error(); |
} else { |
} else if (pk->type == EVP_PKEY_RSA) { |
|
/* replace k->rsa with loaded key */ |
|
if (k->type == KEY_RSA || k->type == KEY_UNSPEC) { |
|
if (k->rsa != NULL) |
|
RSA_free(k->rsa); |
|
k->rsa = EVP_PKEY_get1_RSA(pk); |
|
k->type = KEY_RSA; |
|
name = "rsa w/o comment"; |
|
success = 1; |
|
#ifdef DEBUG_PK |
|
RSA_print_fp(stderr, k->rsa, 8); |
|
#endif |
|
} |
|
} else if (pk->type == EVP_PKEY_DSA) { |
/* replace k->dsa with loaded key */ |
/* replace k->dsa with loaded key */ |
DSA_free(k->dsa); |
if (k->type == KEY_DSA || k->type == KEY_UNSPEC) { |
k->dsa = dsa; |
if (k->dsa != NULL) |
|
DSA_free(k->dsa); |
|
k->dsa = EVP_PKEY_get1_DSA(pk); |
|
k->type = KEY_DSA; |
|
name = "dsa w/o comment"; |
|
#ifdef DEBUG_PK |
|
DSA_print_fp(stderr, k->dsa, 8); |
|
#endif |
|
success = 1; |
|
} |
|
} else { |
|
error("PEM_read_PrivateKey: mismatch or " |
|
"unknown EVP_PKEY save_type %d", pk->save_type); |
} |
} |
BIO_free(in); |
|
fclose(fp); |
fclose(fp); |
if (comment_return) |
if (pk != NULL) |
*comment_return = xstrdup("dsa w/o comment"); |
EVP_PKEY_free(pk); |
debug("read DSA private key done"); |
if (success && comment_return) |
#ifdef DEBUG_DSS |
*comment_return = xstrdup(name); |
DSA_print_fp(stderr, dsa, 8); |
debug("read SSH2 private key done: name %s success %d", name, success); |
#endif |
return success; |
return dsa != NULL ? 1 : 0; |
|
} |
} |
|
|
int |
int |
|
|
|
|
/* check owner and modes */ |
/* check owner and modes */ |
if (fstat(fd, &st) < 0 || |
if (fstat(fd, &st) < 0 || |
(st.st_uid != 0 && st.st_uid != getuid()) || |
(st.st_uid != 0 && getuid() != 0 && st.st_uid != getuid()) || |
(st.st_mode & 077) != 0) { |
(st.st_mode & 077) != 0) { |
close(fd); |
close(fd); |
error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"); |
error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"); |
error("@ WARNING: UNPROTECTED PRIVATE KEY FILE! @"); |
error("@ WARNING: UNPROTECTED PRIVATE KEY FILE! @"); |
error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"); |
error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"); |
error("Bad ownership or mode(0%3.3o) for '%s'.", |
error("Bad ownership or mode(0%3.3o) for '%s'.", |
st.st_mode & 0777, filename); |
st.st_mode & 0777, filename); |
error("It is recommended that your private key files are NOT accessible by others."); |
error("It is recommended that your private key files are NOT accessible by others."); |
return 0; |
return 0; |
} |
} |
switch (key->type) { |
switch (key->type) { |
case KEY_RSA: |
case KEY_RSA1: |
if (key->rsa->e != NULL) { |
if (key->rsa->e != NULL) { |
BN_clear_free(key->rsa->e); |
BN_clear_free(key->rsa->e); |
key->rsa->e = NULL; |
key->rsa->e = NULL; |
|
|
BN_clear_free(key->rsa->n); |
BN_clear_free(key->rsa->n); |
key->rsa->n = NULL; |
key->rsa->n = NULL; |
} |
} |
ret = load_private_key_rsa(fd, filename, passphrase, |
ret = load_private_key_rsa1(fd, filename, passphrase, |
key->rsa, comment_return); |
key->rsa, comment_return); /* closes fd */ |
|
|
break; |
break; |
case KEY_DSA: |
case KEY_DSA: |
ret = load_private_key_dsa(fd, passphrase, key, comment_return); |
case KEY_RSA: |
|
case KEY_UNSPEC: |
|
ret = load_private_key_ssh2(fd, passphrase, key, |
|
comment_return); /* closes fd */ |
|
break; |
default: |
default: |
|
close(fd); |
break; |
break; |
} |
} |
close(fd); |
|
return ret; |
return ret; |
} |
} |
|
|
|
|
do_load_public_key(const char *filename, Key *k, char **commentp) |
do_load_public_key(const char *filename, Key *k, char **commentp) |
{ |
{ |
FILE *f; |
FILE *f; |
unsigned int bits; |
|
char line[1024]; |
char line[1024]; |
char *cp; |
char *cp; |
|
|
|
|
for (; *cp && (*cp == ' ' || *cp == '\t'); cp++) |
for (; *cp && (*cp == ' ' || *cp == '\t'); cp++) |
; |
; |
if (*cp) { |
if (*cp) { |
bits = key_read(k, &cp); |
if (key_read(k, &cp) == 1) { |
if (bits != 0) { |
|
if (commentp) |
if (commentp) |
*commentp=xstrdup(filename); |
*commentp=xstrdup(filename); |
fclose(f); |
fclose(f); |