version 1.32, 2001/04/18 23:44:51 |
version 1.32.2.3, 2002/03/09 00:20:44 |
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#include "ssh.h" |
#include "ssh.h" |
#include "log.h" |
#include "log.h" |
#include "authfile.h" |
#include "authfile.h" |
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#include "rsa.h" |
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/* Version identification string for SSH v1 identity files. */ |
/* Version identification string for SSH v1 identity files. */ |
static const char authfile_id_string[] = |
static const char authfile_id_string[] = |
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* passphrase. |
* passphrase. |
*/ |
*/ |
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int |
static int |
key_save_private_rsa1(Key *key, const char *filename, const char *passphrase, |
key_save_private_rsa1(Key *key, const char *filename, const char *passphrase, |
const char *comment) |
const char *comment) |
{ |
{ |
Buffer buffer, encrypted; |
Buffer buffer, encrypted; |
char buf[100], *cp; |
u_char buf[100], *cp; |
int fd, i; |
int fd, i, cipher_num; |
CipherContext ciphercontext; |
CipherContext ciphercontext; |
Cipher *cipher; |
Cipher *cipher; |
u_int32_t rand; |
u_int32_t rand; |
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* If the passphrase is empty, use SSH_CIPHER_NONE to ease converting |
* If the passphrase is empty, use SSH_CIPHER_NONE to ease converting |
* to another cipher; otherwise use SSH_AUTHFILE_CIPHER. |
* to another cipher; otherwise use SSH_AUTHFILE_CIPHER. |
*/ |
*/ |
if (strcmp(passphrase, "") == 0) |
cipher_num = (strcmp(passphrase, "") == 0) ? |
cipher = cipher_by_number(SSH_CIPHER_NONE); |
SSH_CIPHER_NONE : SSH_AUTHFILE_CIPHER; |
else |
if ((cipher = cipher_by_number(cipher_num)) == NULL) |
cipher = cipher_by_number(SSH_AUTHFILE_CIPHER); |
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if (cipher == NULL) |
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fatal("save_private_key_rsa: bad cipher"); |
fatal("save_private_key_rsa: bad cipher"); |
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/* This buffer is used to built the secret part of the private key. */ |
/* This buffer is used to built the secret part of the private key. */ |
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buffer_put_char(&encrypted, 0); |
buffer_put_char(&encrypted, 0); |
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/* Store cipher type. */ |
/* Store cipher type. */ |
buffer_put_char(&encrypted, cipher->number); |
buffer_put_char(&encrypted, cipher_num); |
buffer_put_int(&encrypted, 0); /* For future extension */ |
buffer_put_int(&encrypted, 0); /* For future extension */ |
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/* Store public key. This will be in plain text. */ |
/* Store public key. This will be in plain text. */ |
buffer_put_int(&encrypted, BN_num_bits(key->rsa->n)); |
buffer_put_int(&encrypted, BN_num_bits(key->rsa->n)); |
buffer_put_bignum(&encrypted, key->rsa->n); |
buffer_put_bignum(&encrypted, key->rsa->n); |
buffer_put_bignum(&encrypted, key->rsa->e); |
buffer_put_bignum(&encrypted, key->rsa->e); |
buffer_put_string(&encrypted, comment, strlen(comment)); |
buffer_put_cstring(&encrypted, comment); |
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/* Allocate space for the private part of the key in the buffer. */ |
/* Allocate space for the private part of the key in the buffer. */ |
buffer_append_space(&encrypted, &cp, buffer_len(&buffer)); |
cp = buffer_append_space(&encrypted, buffer_len(&buffer)); |
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cipher_set_key_string(&ciphercontext, cipher, passphrase); |
cipher_set_key_string(&ciphercontext, cipher, passphrase, |
cipher_encrypt(&ciphercontext, (u_char *) cp, |
CIPHER_ENCRYPT); |
(u_char *) buffer_ptr(&buffer), buffer_len(&buffer)); |
cipher_crypt(&ciphercontext, cp, |
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buffer_ptr(&buffer), buffer_len(&buffer)); |
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cipher_cleanup(&ciphercontext); |
memset(&ciphercontext, 0, sizeof(ciphercontext)); |
memset(&ciphercontext, 0, sizeof(ciphercontext)); |
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/* Destroy temporary data. */ |
/* Destroy temporary data. */ |
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if (write(fd, buffer_ptr(&encrypted), buffer_len(&encrypted)) != |
if (write(fd, buffer_ptr(&encrypted), buffer_len(&encrypted)) != |
buffer_len(&encrypted)) { |
buffer_len(&encrypted)) { |
error("write to key file %s failed: %s", filename, |
error("write to key file %s failed: %s", filename, |
strerror(errno)); |
strerror(errno)); |
buffer_free(&encrypted); |
buffer_free(&encrypted); |
close(fd); |
close(fd); |
unlink(filename); |
unlink(filename); |
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} |
} |
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/* save SSH v2 key in OpenSSL PEM format */ |
/* save SSH v2 key in OpenSSL PEM format */ |
int |
static int |
key_save_private_pem(Key *key, const char *filename, const char *_passphrase, |
key_save_private_pem(Key *key, const char *filename, const char *_passphrase, |
const char *comment) |
const char *comment) |
{ |
{ |
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int fd; |
int fd; |
int success = 0; |
int success = 0; |
int len = strlen(_passphrase); |
int len = strlen(_passphrase); |
char *passphrase = (len > 0) ? (char *)_passphrase : NULL; |
u_char *passphrase = (len > 0) ? (u_char *)_passphrase : NULL; |
EVP_CIPHER *cipher = (len > 0) ? EVP_des_ede3_cbc() : NULL; |
const EVP_CIPHER *cipher = (len > 0) ? EVP_des_ede3_cbc() : NULL; |
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if (len > 0 && len <= 4) { |
if (len > 0 && len <= 4) { |
error("passphrase too short: have %d bytes, need > 4", len); |
error("passphrase too short: have %d bytes, need > 4", len); |
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* otherwise. |
* otherwise. |
*/ |
*/ |
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Key * |
static Key * |
key_load_public_rsa1(int fd, const char *filename, char **commentp) |
key_load_public_rsa1(int fd, const char *filename, char **commentp) |
{ |
{ |
Buffer buffer; |
Buffer buffer; |
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lseek(fd, (off_t) 0, SEEK_SET); |
lseek(fd, (off_t) 0, SEEK_SET); |
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buffer_init(&buffer); |
buffer_init(&buffer); |
buffer_append_space(&buffer, &cp, len); |
cp = buffer_append_space(&buffer, len); |
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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, |
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/* Check that it is at least big enough to contain the ID string. */ |
/* Check that it is at least big enough to contain the ID string. */ |
if (len < sizeof(authfile_id_string)) { |
if (len < sizeof(authfile_id_string)) { |
debug3("No RSA1 key file %.200s.", filename); |
debug3("Not a RSA1 key file %.200s.", filename); |
buffer_free(&buffer); |
buffer_free(&buffer); |
return NULL; |
return NULL; |
} |
} |
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*/ |
*/ |
for (i = 0; i < sizeof(authfile_id_string); i++) |
for (i = 0; i < sizeof(authfile_id_string); i++) |
if (buffer_get_char(&buffer) != authfile_id_string[i]) { |
if (buffer_get_char(&buffer) != authfile_id_string[i]) { |
debug3("No RSA1 key file %.200s.", filename); |
debug3("Not a RSA1 key file %.200s.", filename); |
buffer_free(&buffer); |
buffer_free(&buffer); |
return NULL; |
return NULL; |
} |
} |
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* Assumes we are called under uid of the owner of the file. |
* Assumes we are called under uid of the owner of the file. |
*/ |
*/ |
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Key * |
static Key * |
key_load_private_rsa1(int fd, const char *filename, const char *passphrase, |
key_load_private_rsa1(int fd, const char *filename, const char *passphrase, |
char **commentp) |
char **commentp) |
{ |
{ |
int i, check1, check2, cipher_type; |
int i, check1, check2, cipher_type; |
off_t len; |
off_t len; |
Buffer buffer, decrypted; |
Buffer buffer, decrypted; |
char *cp; |
u_char *cp; |
CipherContext ciphercontext; |
CipherContext ciphercontext; |
Cipher *cipher; |
Cipher *cipher; |
BN_CTX *ctx; |
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BIGNUM *aux; |
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Key *prv = NULL; |
Key *prv = NULL; |
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len = lseek(fd, (off_t) 0, SEEK_END); |
len = lseek(fd, (off_t) 0, SEEK_END); |
lseek(fd, (off_t) 0, SEEK_SET); |
lseek(fd, (off_t) 0, SEEK_SET); |
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buffer_init(&buffer); |
buffer_init(&buffer); |
buffer_append_space(&buffer, &cp, len); |
cp = buffer_append_space(&buffer, len); |
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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, |
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/* Check that it is at least big enough to contain the ID string. */ |
/* Check that it is at least big enough to contain the ID string. */ |
if (len < sizeof(authfile_id_string)) { |
if (len < sizeof(authfile_id_string)) { |
debug3("No RSA1 key file %.200s.", filename); |
debug3("Not a RSA1 key file %.200s.", filename); |
buffer_free(&buffer); |
buffer_free(&buffer); |
close(fd); |
close(fd); |
return NULL; |
return NULL; |
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*/ |
*/ |
for (i = 0; i < sizeof(authfile_id_string); i++) |
for (i = 0; i < sizeof(authfile_id_string); i++) |
if (buffer_get_char(&buffer) != authfile_id_string[i]) { |
if (buffer_get_char(&buffer) != authfile_id_string[i]) { |
debug3("No RSA1 key file %.200s.", filename); |
debug3("Not a RSA1 key file %.200s.", filename); |
buffer_free(&buffer); |
buffer_free(&buffer); |
close(fd); |
close(fd); |
return NULL; |
return NULL; |
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} |
} |
/* Initialize space for decrypted data. */ |
/* Initialize space for decrypted data. */ |
buffer_init(&decrypted); |
buffer_init(&decrypted); |
buffer_append_space(&decrypted, &cp, buffer_len(&buffer)); |
cp = buffer_append_space(&decrypted, buffer_len(&buffer)); |
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/* 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, (u_char *) cp, |
CIPHER_DECRYPT); |
(u_char *) buffer_ptr(&buffer), buffer_len(&buffer)); |
cipher_crypt(&ciphercontext, cp, |
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buffer_ptr(&buffer), buffer_len(&buffer)); |
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cipher_cleanup(&ciphercontext); |
memset(&ciphercontext, 0, sizeof(ciphercontext)); |
memset(&ciphercontext, 0, sizeof(ciphercontext)); |
buffer_free(&buffer); |
buffer_free(&buffer); |
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buffer_get_bignum(&decrypted, prv->rsa->p); /* q */ |
buffer_get_bignum(&decrypted, prv->rsa->p); /* q */ |
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/* calculate p-1 and q-1 */ |
/* calculate p-1 and q-1 */ |
ctx = BN_CTX_new(); |
rsa_generate_additional_parameters(prv->rsa); |
aux = BN_new(); |
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BN_sub(aux, prv->rsa->q, BN_value_one()); |
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BN_mod(prv->rsa->dmq1, prv->rsa->d, aux, ctx); |
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BN_sub(aux, prv->rsa->p, BN_value_one()); |
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BN_mod(prv->rsa->dmp1, prv->rsa->d, aux, ctx); |
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BN_clear_free(aux); |
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BN_CTX_free(ctx); |
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buffer_free(&decrypted); |
buffer_free(&decrypted); |
close(fd); |
close(fd); |
return prv; |
return prv; |
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return NULL; |
return NULL; |
} |
} |
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Key * |
static Key * |
key_load_private_pem(int fd, int type, const char *passphrase, |
key_load_private_pem(int fd, int type, const char *passphrase, |
char **commentp) |
char **commentp) |
{ |
{ |
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debug("PEM_read_PrivateKey failed"); |
debug("PEM_read_PrivateKey failed"); |
(void)ERR_get_error(); |
(void)ERR_get_error(); |
} else if (pk->type == EVP_PKEY_RSA && |
} else if (pk->type == EVP_PKEY_RSA && |
(type == KEY_UNSPEC||type==KEY_RSA)) { |
(type == KEY_UNSPEC||type==KEY_RSA)) { |
prv = key_new(KEY_UNSPEC); |
prv = key_new(KEY_UNSPEC); |
prv->rsa = EVP_PKEY_get1_RSA(pk); |
prv->rsa = EVP_PKEY_get1_RSA(pk); |
prv->type = KEY_RSA; |
prv->type = KEY_RSA; |
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RSA_print_fp(stderr, prv->rsa, 8); |
RSA_print_fp(stderr, prv->rsa, 8); |
#endif |
#endif |
} else if (pk->type == EVP_PKEY_DSA && |
} else if (pk->type == EVP_PKEY_DSA && |
(type == KEY_UNSPEC||type==KEY_DSA)) { |
(type == KEY_UNSPEC||type==KEY_DSA)) { |
prv = key_new(KEY_UNSPEC); |
prv = key_new(KEY_UNSPEC); |
prv->dsa = EVP_PKEY_get1_DSA(pk); |
prv->dsa = EVP_PKEY_get1_DSA(pk); |
prv->type = KEY_DSA; |
prv->type = KEY_DSA; |
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return prv; |
return prv; |
} |
} |
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int |
static int |
key_perm_ok(int fd, const char *filename) |
key_perm_ok(int fd, const char *filename) |
{ |
{ |
struct stat st; |
struct stat st; |
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/* check owner and modes */ |
if (fstat(fd, &st) < 0) |
if (fstat(fd, &st) < 0 || |
return 0; |
(st.st_uid != 0 && getuid() != 0 && st.st_uid != getuid()) || |
/* |
(st.st_mode & 077) != 0) { |
* if a key owned by the user is accessed, then we check the |
close(fd); |
* permissions of the file. if the key owned by a different user, |
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* then we don't care. |
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*/ |
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if ((st.st_uid == getuid()) && (st.st_mode & 077) != 0) { |
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("Permissions 0%3.3o for '%s' are too open.", |
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."); |
error("This private key will be ignored."); |
error("This private key will be ignored."); |
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key_load_private(const char *filename, const char *passphrase, |
key_load_private(const char *filename, const char *passphrase, |
char **commentp) |
char **commentp) |
{ |
{ |
Key *pub; |
Key *pub, *prv; |
int fd; |
int fd; |
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fd = open(filename, O_RDONLY); |
fd = open(filename, O_RDONLY); |
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lseek(fd, (off_t) 0, SEEK_SET); /* rewind */ |
lseek(fd, (off_t) 0, SEEK_SET); /* rewind */ |
if (pub == NULL) { |
if (pub == NULL) { |
/* closes fd */ |
/* closes fd */ |
return key_load_private_pem(fd, KEY_UNSPEC, passphrase, NULL); |
prv = key_load_private_pem(fd, KEY_UNSPEC, passphrase, NULL); |
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/* use the filename as a comment for PEM */ |
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if (commentp && prv) |
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*commentp = xstrdup(filename); |
} else { |
} else { |
/* it's a SSH v1 key if the public key part is readable */ |
/* it's a SSH v1 key if the public key part is readable */ |
key_free(pub); |
key_free(pub); |
/* closes fd */ |
/* closes fd */ |
return key_load_private_rsa1(fd, filename, passphrase, NULL); |
prv = key_load_private_rsa1(fd, filename, passphrase, NULL); |
} |
} |
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return prv; |
} |
} |
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int |
static int |
key_try_load_public(Key *k, const char *filename, char **commentp) |
key_try_load_public(Key *k, const char *filename, char **commentp) |
{ |
{ |
FILE *f; |
FILE *f; |
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while (fgets(line, sizeof(line), f)) { |
while (fgets(line, sizeof(line), f)) { |
line[sizeof(line)-1] = '\0'; |
line[sizeof(line)-1] = '\0'; |
cp = line; |
cp = line; |
switch(*cp){ |
switch (*cp) { |
case '#': |
case '#': |
case '\n': |
case '\n': |
case '\0': |
case '\0': |