version 1.20, 1999/11/19 10:20:51 |
version 1.21, 1999/11/23 22:25:55 |
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#include <ssl/md5.h> |
#include <ssl/md5.h> |
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typedef struct |
typedef struct { |
{ |
int fd; |
int fd; |
enum { |
enum { AUTH_UNUSED, AUTH_SOCKET, AUTH_CONNECTION } type; |
AUTH_UNUSED, AUTH_SOCKET, AUTH_CONNECTION |
Buffer input; |
} type; |
Buffer output; |
Buffer input; |
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Buffer output; |
} SocketEntry; |
} SocketEntry; |
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unsigned int sockets_alloc = 0; |
unsigned int sockets_alloc = 0; |
SocketEntry *sockets = NULL; |
SocketEntry *sockets = NULL; |
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typedef struct |
typedef struct { |
{ |
RSA *key; |
RSA *key; |
char *comment; |
char *comment; |
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} Identity; |
} Identity; |
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unsigned int num_identities = 0; |
unsigned int num_identities = 0; |
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void |
void |
process_request_identity(SocketEntry *e) |
process_request_identity(SocketEntry *e) |
{ |
{ |
Buffer msg; |
Buffer msg; |
int i; |
int i; |
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buffer_init(&msg); |
buffer_init(&msg); |
buffer_put_char(&msg, SSH_AGENT_RSA_IDENTITIES_ANSWER); |
buffer_put_char(&msg, SSH_AGENT_RSA_IDENTITIES_ANSWER); |
buffer_put_int(&msg, num_identities); |
buffer_put_int(&msg, num_identities); |
for (i = 0; i < num_identities; i++) |
for (i = 0; i < num_identities; i++) { |
{ |
buffer_put_int(&msg, BN_num_bits(identities[i].key->n)); |
buffer_put_int(&msg, BN_num_bits(identities[i].key->n)); |
buffer_put_bignum(&msg, identities[i].key->e); |
buffer_put_bignum(&msg, identities[i].key->e); |
buffer_put_bignum(&msg, identities[i].key->n); |
buffer_put_bignum(&msg, identities[i].key->n); |
buffer_put_string(&msg, identities[i].comment, |
buffer_put_string(&msg, identities[i].comment, |
strlen(identities[i].comment)); |
strlen(identities[i].comment)); |
} |
} |
buffer_put_int(&e->output, buffer_len(&msg)); |
buffer_put_int(&e->output, buffer_len(&msg)); |
buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg)); |
buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg)); |
buffer_free(&msg); |
buffer_free(&msg); |
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} |
} |
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void |
void |
process_authentication_challenge(SocketEntry *e) |
process_authentication_challenge(SocketEntry *e) |
{ |
{ |
int i, pub_bits, len; |
int i, pub_bits, len; |
BIGNUM *pub_e, *pub_n, *challenge; |
BIGNUM *pub_e, *pub_n, *challenge; |
Buffer msg; |
Buffer msg; |
MD5_CTX md; |
MD5_CTX md; |
unsigned char buf[32], mdbuf[16], session_id[16]; |
unsigned char buf[32], mdbuf[16], session_id[16]; |
unsigned int response_type; |
unsigned int response_type; |
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buffer_init(&msg); |
buffer_init(&msg); |
pub_e = BN_new(); |
pub_e = BN_new(); |
pub_n = BN_new(); |
pub_n = BN_new(); |
challenge = BN_new(); |
challenge = BN_new(); |
pub_bits = buffer_get_int(&e->input); |
pub_bits = buffer_get_int(&e->input); |
buffer_get_bignum(&e->input, pub_e); |
buffer_get_bignum(&e->input, pub_e); |
buffer_get_bignum(&e->input, pub_n); |
buffer_get_bignum(&e->input, pub_n); |
buffer_get_bignum(&e->input, challenge); |
buffer_get_bignum(&e->input, challenge); |
if (buffer_len(&e->input) == 0) |
if (buffer_len(&e->input) == 0) { |
{ |
/* Compatibility code for old servers. */ |
/* Compatibility code for old servers. */ |
memset(session_id, 0, 16); |
memset(session_id, 0, 16); |
response_type = 0; |
response_type = 0; |
} else { |
} |
/* New code. */ |
else |
buffer_get(&e->input, (char *) session_id, 16); |
{ |
response_type = buffer_get_int(&e->input); |
/* New code. */ |
} |
buffer_get(&e->input, (char *)session_id, 16); |
for (i = 0; i < num_identities; i++) |
response_type = buffer_get_int(&e->input); |
if (pub_bits == BN_num_bits(identities[i].key->n) && |
} |
BN_cmp(pub_e, identities[i].key->e) == 0 && |
for (i = 0; i < num_identities; i++) |
BN_cmp(pub_n, identities[i].key->n) == 0) { |
if (pub_bits == BN_num_bits(identities[i].key->n) && |
/* Decrypt the challenge using the private key. */ |
BN_cmp(pub_e, identities[i].key->e) == 0 && |
rsa_private_decrypt(challenge, challenge, identities[i].key); |
BN_cmp(pub_n, identities[i].key->n) == 0) |
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{ |
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/* Decrypt the challenge using the private key. */ |
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rsa_private_decrypt(challenge, challenge, identities[i].key); |
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/* Compute the desired response. */ |
/* Compute the desired response. */ |
switch (response_type) |
switch (response_type) { |
{ |
case 0:/* As of protocol 1.0 */ |
case 0: /* As of protocol 1.0 */ |
/* This response type is no longer supported. */ |
/* This response type is no longer supported. */ |
log("Compatibility with ssh protocol 1.0 no longer supported."); |
log("Compatibility with ssh protocol 1.0 no longer supported."); |
buffer_put_char(&msg, SSH_AGENT_FAILURE); |
buffer_put_char(&msg, SSH_AGENT_FAILURE); |
goto send; |
goto send; |
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case 1: /* As of protocol 1.1 */ |
case 1:/* As of protocol 1.1 */ |
/* The response is MD5 of decrypted challenge plus session id. */ |
/* The response is MD5 of decrypted challenge plus session id. */ |
len = BN_num_bytes(challenge); |
len = BN_num_bytes(challenge); |
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if (len <= 0 || len > 32) { |
if (len <= 0 || len > 32) { |
fatal("process_authentication_challenge: " |
fatal("process_authentication_challenge: " |
"bad challenge length %d", len); |
"bad challenge length %d", len); |
} |
} |
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memset(buf, 0, 32); |
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BN_bn2bin(challenge, buf + 32 - len); |
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MD5_Init(&md); |
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MD5_Update(&md, buf, 32); |
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MD5_Update(&md, session_id, 16); |
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MD5_Final(mdbuf, &md); |
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break; |
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memset(buf, 0, 32); |
default: |
BN_bn2bin(challenge, buf + 32 - len); |
fatal("process_authentication_challenge: bad response_type %d", |
MD5_Init(&md); |
response_type); |
MD5_Update(&md, buf, 32); |
break; |
MD5_Update(&md, session_id, 16); |
} |
MD5_Final(mdbuf, &md); |
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break; |
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default: |
/* Send the response. */ |
fatal("process_authentication_challenge: bad response_type %d", |
buffer_put_char(&msg, SSH_AGENT_RSA_RESPONSE); |
response_type); |
for (i = 0; i < 16; i++) |
break; |
buffer_put_char(&msg, mdbuf[i]); |
} |
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/* Send the response. */ |
goto send; |
buffer_put_char(&msg, SSH_AGENT_RSA_RESPONSE); |
} |
for (i = 0; i < 16; i++) |
/* Unknown identity. Send failure. */ |
buffer_put_char(&msg, mdbuf[i]); |
buffer_put_char(&msg, SSH_AGENT_FAILURE); |
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send: |
goto send; |
buffer_put_int(&e->output, buffer_len(&msg)); |
} |
buffer_append(&e->output, buffer_ptr(&msg), |
/* Unknown identity. Send failure. */ |
buffer_len(&msg)); |
buffer_put_char(&msg, SSH_AGENT_FAILURE); |
buffer_free(&msg); |
send: |
BN_clear_free(pub_e); |
buffer_put_int(&e->output, buffer_len(&msg)); |
BN_clear_free(pub_n); |
buffer_append(&e->output, buffer_ptr(&msg), |
BN_clear_free(challenge); |
buffer_len(&msg)); |
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buffer_free(&msg); |
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BN_clear_free(pub_e); |
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BN_clear_free(pub_n); |
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BN_clear_free(challenge); |
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} |
} |
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void |
void |
process_remove_identity(SocketEntry *e) |
process_remove_identity(SocketEntry *e) |
{ |
{ |
unsigned int bits; |
unsigned int bits; |
unsigned int i; |
unsigned int i; |
BIGNUM *dummy, *n; |
BIGNUM *dummy, *n; |
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dummy = BN_new(); |
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n = BN_new(); |
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/* Get the key from the packet. */ |
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bits = buffer_get_int(&e->input); |
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buffer_get_bignum(&e->input, dummy); |
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buffer_get_bignum(&e->input, n); |
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if (bits != BN_num_bits(n)) |
dummy = BN_new(); |
error("Warning: keysize mismatch: actual %d, announced %d", |
n = BN_new(); |
BN_num_bits(n), bits); |
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/* Check if we have the key. */ |
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for (i = 0; i < num_identities; i++) |
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if (BN_cmp(identities[i].key->n, n) == 0) |
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{ |
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/* We have this key. Free the old key. Since we don\'t want to leave |
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empty slots in the middle of the array, we actually free the |
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key there and copy data from the last entry. */ |
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RSA_free(identities[i].key); |
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xfree(identities[i].comment); |
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if (i < num_identities - 1) |
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identities[i] = identities[num_identities - 1]; |
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num_identities--; |
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BN_clear_free(dummy); |
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BN_clear_free(n); |
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/* Send success. */ |
/* Get the key from the packet. */ |
buffer_put_int(&e->output, 1); |
bits = buffer_get_int(&e->input); |
buffer_put_char(&e->output, SSH_AGENT_SUCCESS); |
buffer_get_bignum(&e->input, dummy); |
return; |
buffer_get_bignum(&e->input, n); |
} |
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/* We did not have the key. */ |
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BN_clear(dummy); |
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BN_clear(n); |
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/* Send failure. */ |
if (bits != BN_num_bits(n)) |
buffer_put_int(&e->output, 1); |
error("Warning: keysize mismatch: actual %d, announced %d", |
buffer_put_char(&e->output, SSH_AGENT_FAILURE); |
BN_num_bits(n), bits); |
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/* Check if we have the key. */ |
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for (i = 0; i < num_identities; i++) |
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if (BN_cmp(identities[i].key->n, n) == 0) { |
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/* We have this key. Free the old key. Since we |
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don\'t want to leave empty slots in the middle |
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of the array, we actually free the key there |
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and copy data from the last entry. */ |
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RSA_free(identities[i].key); |
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xfree(identities[i].comment); |
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if (i < num_identities - 1) |
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identities[i] = identities[num_identities - 1]; |
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num_identities--; |
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BN_clear_free(dummy); |
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BN_clear_free(n); |
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/* Send success. */ |
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buffer_put_int(&e->output, 1); |
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buffer_put_char(&e->output, SSH_AGENT_SUCCESS); |
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return; |
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} |
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/* We did not have the key. */ |
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BN_clear(dummy); |
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BN_clear(n); |
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/* Send failure. */ |
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buffer_put_int(&e->output, 1); |
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buffer_put_char(&e->output, SSH_AGENT_FAILURE); |
} |
} |
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/* Removes all identities from the agent. */ |
/* Removes all identities from the agent. */ |
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void |
void |
process_remove_all_identities(SocketEntry *e) |
process_remove_all_identities(SocketEntry *e) |
{ |
{ |
unsigned int i; |
unsigned int i; |
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/* Loop over all identities and clear the keys. */ |
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for (i = 0; i < num_identities; i++) |
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{ |
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RSA_free(identities[i].key); |
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xfree(identities[i].comment); |
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} |
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/* Mark that there are no identities. */ |
/* Loop over all identities and clear the keys. */ |
num_identities = 0; |
for (i = 0; i < num_identities; i++) { |
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RSA_free(identities[i].key); |
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xfree(identities[i].comment); |
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} |
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/* Send success. */ |
/* Mark that there are no identities. */ |
buffer_put_int(&e->output, 1); |
num_identities = 0; |
buffer_put_char(&e->output, SSH_AGENT_SUCCESS); |
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return; |
/* Send success. */ |
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buffer_put_int(&e->output, 1); |
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buffer_put_char(&e->output, SSH_AGENT_SUCCESS); |
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return; |
} |
} |
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/* Adds an identity to the agent. */ |
/* Adds an identity to the agent. */ |
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void |
void |
process_add_identity(SocketEntry *e) |
process_add_identity(SocketEntry *e) |
{ |
{ |
RSA *k; |
RSA *k; |
int i; |
int i; |
BIGNUM *aux; |
BIGNUM *aux; |
BN_CTX *ctx; |
BN_CTX *ctx; |
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if (num_identities == 0) |
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identities = xmalloc(sizeof(Identity)); |
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else |
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identities = xrealloc(identities, (num_identities + 1) * sizeof(Identity)); |
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identities[num_identities].key = RSA_new(); |
if (num_identities == 0) |
k = identities[num_identities].key; |
identities = xmalloc(sizeof(Identity)); |
buffer_get_int(&e->input); /* bits */ |
else |
k->n = BN_new(); |
identities = xrealloc(identities, (num_identities + 1) * sizeof(Identity)); |
buffer_get_bignum(&e->input, k->n); |
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k->e = BN_new(); |
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buffer_get_bignum(&e->input, k->e); |
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k->d = BN_new(); |
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buffer_get_bignum(&e->input, k->d); |
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k->iqmp = BN_new(); |
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buffer_get_bignum(&e->input, k->iqmp); |
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/* SSH and SSL have p and q swapped */ |
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k->q = BN_new(); |
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buffer_get_bignum(&e->input, k->q); /* p */ |
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k->p = BN_new(); |
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buffer_get_bignum(&e->input, k->p); /* q */ |
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/* Generate additional parameters */ |
identities[num_identities].key = RSA_new(); |
aux = BN_new(); |
k = identities[num_identities].key; |
ctx = BN_CTX_new(); |
buffer_get_int(&e->input); /* bits */ |
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k->n = BN_new(); |
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buffer_get_bignum(&e->input, k->n); |
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k->e = BN_new(); |
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buffer_get_bignum(&e->input, k->e); |
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k->d = BN_new(); |
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buffer_get_bignum(&e->input, k->d); |
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k->iqmp = BN_new(); |
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buffer_get_bignum(&e->input, k->iqmp); |
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/* SSH and SSL have p and q swapped */ |
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k->q = BN_new(); |
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buffer_get_bignum(&e->input, k->q); /* p */ |
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k->p = BN_new(); |
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buffer_get_bignum(&e->input, k->p); /* q */ |
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BN_sub(aux, k->q, BN_value_one()); |
/* Generate additional parameters */ |
k->dmq1 = BN_new(); |
aux = BN_new(); |
BN_mod(k->dmq1, k->d, aux, ctx); |
ctx = BN_CTX_new(); |
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BN_sub(aux, k->p, BN_value_one()); |
BN_sub(aux, k->q, BN_value_one()); |
k->dmp1 = BN_new(); |
k->dmq1 = BN_new(); |
BN_mod(k->dmp1, k->d, aux, ctx); |
BN_mod(k->dmq1, k->d, aux, ctx); |
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BN_clear_free(aux); |
BN_sub(aux, k->p, BN_value_one()); |
BN_CTX_free(ctx); |
k->dmp1 = BN_new(); |
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BN_mod(k->dmp1, k->d, aux, ctx); |
identities[num_identities].comment = buffer_get_string(&e->input, NULL); |
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/* Check if we already have the key. */ |
BN_clear_free(aux); |
for (i = 0; i < num_identities; i++) |
BN_CTX_free(ctx); |
if (BN_cmp(identities[i].key->n, k->n) == 0) |
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{ |
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/* We already have this key. Clear and free the new data and |
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return success. */ |
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RSA_free(k); |
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xfree(identities[num_identities].comment); |
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/* Send success. */ |
identities[num_identities].comment = buffer_get_string(&e->input, NULL); |
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/* Check if we already have the key. */ |
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for (i = 0; i < num_identities; i++) |
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if (BN_cmp(identities[i].key->n, k->n) == 0) { |
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/* We already have this key. Clear and free the |
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new data and return success. */ |
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RSA_free(k); |
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xfree(identities[num_identities].comment); |
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/* Send success. */ |
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buffer_put_int(&e->output, 1); |
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buffer_put_char(&e->output, SSH_AGENT_SUCCESS); |
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return; |
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} |
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/* Increment the number of identities. */ |
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num_identities++; |
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/* Send a success message. */ |
buffer_put_int(&e->output, 1); |
buffer_put_int(&e->output, 1); |
buffer_put_char(&e->output, SSH_AGENT_SUCCESS); |
buffer_put_char(&e->output, SSH_AGENT_SUCCESS); |
return; |
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} |
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/* Increment the number of identities. */ |
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num_identities++; |
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/* Send a success message. */ |
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buffer_put_int(&e->output, 1); |
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buffer_put_char(&e->output, SSH_AGENT_SUCCESS); |
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} |
} |
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void |
void |
process_message(SocketEntry *e) |
process_message(SocketEntry *e) |
{ |
{ |
unsigned int msg_len; |
unsigned int msg_len; |
unsigned int type; |
unsigned int type; |
unsigned char *cp; |
unsigned char *cp; |
if (buffer_len(&e->input) < 5) |
if (buffer_len(&e->input) < 5) |
return; /* Incomplete message. */ |
return; /* Incomplete message. */ |
cp = (unsigned char *)buffer_ptr(&e->input); |
cp = (unsigned char *) buffer_ptr(&e->input); |
msg_len = GET_32BIT(cp); |
msg_len = GET_32BIT(cp); |
if (msg_len > 256 * 1024) |
if (msg_len > 256 * 1024) { |
{ |
shutdown(e->fd, SHUT_RDWR); |
shutdown(e->fd, SHUT_RDWR); |
close(e->fd); |
close(e->fd); |
e->type = AUTH_UNUSED; |
e->type = AUTH_UNUSED; |
return; |
return; |
} |
} |
if (buffer_len(&e->input) < msg_len + 4) |
if (buffer_len(&e->input) < msg_len + 4) |
return; |
return; |
buffer_consume(&e->input, 4); |
buffer_consume(&e->input, 4); |
type = buffer_get_char(&e->input); |
type = buffer_get_char(&e->input); |
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switch (type) |
switch (type) { |
{ |
case SSH_AGENTC_REQUEST_RSA_IDENTITIES: |
case SSH_AGENTC_REQUEST_RSA_IDENTITIES: |
process_request_identity(e); |
process_request_identity(e); |
break; |
break; |
case SSH_AGENTC_RSA_CHALLENGE: |
case SSH_AGENTC_RSA_CHALLENGE: |
process_authentication_challenge(e); |
process_authentication_challenge(e); |
break; |
break; |
case SSH_AGENTC_ADD_RSA_IDENTITY: |
case SSH_AGENTC_ADD_RSA_IDENTITY: |
process_add_identity(e); |
process_add_identity(e); |
break; |
break; |
case SSH_AGENTC_REMOVE_RSA_IDENTITY: |
case SSH_AGENTC_REMOVE_RSA_IDENTITY: |
process_remove_identity(e); |
process_remove_identity(e); |
break; |
break; |
case SSH_AGENTC_REMOVE_ALL_RSA_IDENTITIES: |
case SSH_AGENTC_REMOVE_ALL_RSA_IDENTITIES: |
process_remove_all_identities(e); |
process_remove_all_identities(e); |
break; |
break; |
default: |
default: |
/* Unknown message. Respond with failure. */ |
/* Unknown message. Respond with failure. */ |
error("Unknown message %d", type); |
error("Unknown message %d", type); |
buffer_clear(&e->input); |
buffer_clear(&e->input); |
buffer_put_int(&e->output, 1); |
buffer_put_int(&e->output, 1); |
buffer_put_char(&e->output, SSH_AGENT_FAILURE); |
buffer_put_char(&e->output, SSH_AGENT_FAILURE); |
break; |
break; |
} |
} |
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} |
} |
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void |
void |
new_socket(int type, int fd) |
new_socket(int type, int fd) |
{ |
{ |
unsigned int i, old_alloc; |
unsigned int i, old_alloc; |
if (fcntl(fd, F_SETFL, O_NONBLOCK) < 0) |
if (fcntl(fd, F_SETFL, O_NONBLOCK) < 0) |
error("fcntl O_NONBLOCK: %s", strerror(errno)); |
error("fcntl O_NONBLOCK: %s", strerror(errno)); |
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if (fd > max_fd) |
if (fd > max_fd) |
max_fd = fd; |
max_fd = fd; |
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for (i = 0; i < sockets_alloc; i++) |
for (i = 0; i < sockets_alloc; i++) |
if (sockets[i].type == AUTH_UNUSED) |
if (sockets[i].type == AUTH_UNUSED) { |
{ |
sockets[i].fd = fd; |
sockets[i].fd = fd; |
sockets[i].type = type; |
sockets[i].type = type; |
buffer_init(&sockets[i].input); |
buffer_init(&sockets[i].input); |
buffer_init(&sockets[i].output); |
buffer_init(&sockets[i].output); |
return; |
return; |
} |
} |
old_alloc = sockets_alloc; |
old_alloc = sockets_alloc; |
sockets_alloc += 10; |
sockets_alloc += 10; |
if (sockets) |
if (sockets) |
sockets = xrealloc(sockets, sockets_alloc * sizeof(sockets[0])); |
sockets = xrealloc(sockets, sockets_alloc * sizeof(sockets[0])); |
else |
else |
sockets = xmalloc(sockets_alloc * sizeof(sockets[0])); |
sockets = xmalloc(sockets_alloc * sizeof(sockets[0])); |
for (i = old_alloc; i < sockets_alloc; i++) |
for (i = old_alloc; i < sockets_alloc; i++) |
sockets[i].type = AUTH_UNUSED; |
sockets[i].type = AUTH_UNUSED; |
sockets[old_alloc].type = type; |
sockets[old_alloc].type = type; |
sockets[old_alloc].fd = fd; |
sockets[old_alloc].fd = fd; |
buffer_init(&sockets[old_alloc].input); |
buffer_init(&sockets[old_alloc].input); |
buffer_init(&sockets[old_alloc].output); |
buffer_init(&sockets[old_alloc].output); |
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} |
} |
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void |
void |
prepare_select(fd_set *readset, fd_set *writeset) |
prepare_select(fd_set *readset, fd_set *writeset) |
{ |
{ |
unsigned int i; |
unsigned int i; |
for (i = 0; i < sockets_alloc; i++) |
for (i = 0; i < sockets_alloc; i++) |
switch (sockets[i].type) |
switch (sockets[i].type) { |
{ |
case AUTH_SOCKET: |
case AUTH_SOCKET: |
case AUTH_CONNECTION: |
case AUTH_CONNECTION: |
FD_SET(sockets[i].fd, readset); |
FD_SET(sockets[i].fd, readset); |
if (buffer_len(&sockets[i].output) > 0) |
if (buffer_len(&sockets[i].output) > 0) |
FD_SET(sockets[i].fd, writeset); |
FD_SET(sockets[i].fd, writeset); |
break; |
break; |
case AUTH_UNUSED: |
case AUTH_UNUSED: |
break; |
break; |
default: |
default: |
fatal("Unknown socket type %d", sockets[i].type); |
fatal("Unknown socket type %d", sockets[i].type); |
break; |
break; |
} |
} |
|
} |
} |
|
|
void after_select(fd_set *readset, fd_set *writeset) |
void |
|
after_select(fd_set *readset, fd_set *writeset) |
{ |
{ |
unsigned int i; |
unsigned int i; |
int len, sock; |
int len, sock; |
char buf[1024]; |
char buf[1024]; |
struct sockaddr_un sunaddr; |
struct sockaddr_un sunaddr; |
|
|
for (i = 0; i < sockets_alloc; i++) |
for (i = 0; i < sockets_alloc; i++) |
switch (sockets[i].type) |
switch (sockets[i].type) { |
{ |
case AUTH_UNUSED: |
case AUTH_UNUSED: |
break; |
break; |
case AUTH_SOCKET: |
case AUTH_SOCKET: |
if (FD_ISSET(sockets[i].fd, readset)) { |
if (FD_ISSET(sockets[i].fd, readset)) |
len = sizeof(sunaddr); |
{ |
sock = accept(sockets[i].fd, (struct sockaddr *) & sunaddr, &len); |
len = sizeof(sunaddr); |
if (sock < 0) { |
sock = accept(sockets[i].fd, (struct sockaddr *)&sunaddr, &len); |
perror("accept from AUTH_SOCKET"); |
if (sock < 0) |
break; |
{ |
} |
perror("accept from AUTH_SOCKET"); |
new_socket(AUTH_CONNECTION, sock); |
break; |
} |
} |
break; |
new_socket(AUTH_CONNECTION, sock); |
case AUTH_CONNECTION: |
} |
if (buffer_len(&sockets[i].output) > 0 && |
break; |
FD_ISSET(sockets[i].fd, writeset)) { |
case AUTH_CONNECTION: |
len = write(sockets[i].fd, buffer_ptr(&sockets[i].output), |
if (buffer_len(&sockets[i].output) > 0 && |
buffer_len(&sockets[i].output)); |
FD_ISSET(sockets[i].fd, writeset)) |
if (len <= 0) { |
{ |
shutdown(sockets[i].fd, SHUT_RDWR); |
len = write(sockets[i].fd, buffer_ptr(&sockets[i].output), |
close(sockets[i].fd); |
buffer_len(&sockets[i].output)); |
sockets[i].type = AUTH_UNUSED; |
if (len <= 0) |
break; |
{ |
} |
shutdown(sockets[i].fd, SHUT_RDWR); |
buffer_consume(&sockets[i].output, len); |
close(sockets[i].fd); |
} |
sockets[i].type = AUTH_UNUSED; |
if (FD_ISSET(sockets[i].fd, readset)) { |
break; |
len = read(sockets[i].fd, buf, sizeof(buf)); |
} |
if (len <= 0) { |
buffer_consume(&sockets[i].output, len); |
shutdown(sockets[i].fd, SHUT_RDWR); |
} |
close(sockets[i].fd); |
if (FD_ISSET(sockets[i].fd, readset)) |
sockets[i].type = AUTH_UNUSED; |
{ |
break; |
len = read(sockets[i].fd, buf, sizeof(buf)); |
} |
if (len <= 0) |
buffer_append(&sockets[i].input, buf, len); |
{ |
process_message(&sockets[i]); |
shutdown(sockets[i].fd, SHUT_RDWR); |
} |
close(sockets[i].fd); |
break; |
sockets[i].type = AUTH_UNUSED; |
default: |
break; |
fatal("Unknown type %d", sockets[i].type); |
} |
} |
buffer_append(&sockets[i].input, buf, len); |
|
process_message(&sockets[i]); |
|
} |
|
break; |
|
default: |
|
fatal("Unknown type %d", sockets[i].type); |
|
} |
|
} |
} |
|
|
void |
void |
check_parent_exists(int sig) |
check_parent_exists(int sig) |
{ |
{ |
if (kill(parent_pid, 0) < 0) |
if (kill(parent_pid, 0) < 0) { |
{ |
/* printf("Parent has died - Authentication agent exiting.\n"); */ |
/* printf("Parent has died - Authentication agent exiting.\n"); */ |
exit(1); |
exit(1); |
} |
} |
signal(SIGALRM, check_parent_exists); |
signal(SIGALRM, check_parent_exists); |
alarm(10); |
alarm(10); |
|
} |
} |
|
|
void |
void |
cleanup_socket(void) |
cleanup_socket(void) |
{ |
{ |
remove(socket_name); |
remove(socket_name); |
rmdir(socket_dir); |
rmdir(socket_dir); |
} |
} |
|
|
void |
void |
cleanup_exit(int i) |
cleanup_exit(int i) |
{ |
{ |
cleanup_socket(); |
cleanup_socket(); |
exit(i); |
exit(i); |
} |
} |
|
|
void |
void |
usage() |
usage() |
{ |
{ |
fprintf(stderr, "ssh-agent version %s\n", SSH_VERSION); |
fprintf(stderr, "ssh-agent version %s\n", SSH_VERSION); |
fprintf(stderr, "Usage: %s [-c | -s] [-k] [command {args...]]\n", |
fprintf(stderr, "Usage: %s [-c | -s] [-k] [command {args...]]\n", |
__progname); |
__progname); |
exit(1); |
exit(1); |
} |
} |
|
|
int |
int |
main(int ac, char **av) |
main(int ac, char **av) |
{ |
{ |
fd_set readset, writeset; |
fd_set readset, writeset; |
int sock, c_flag = 0, k_flag = 0, s_flag = 0, ch; |
int sock, c_flag = 0, k_flag = 0, s_flag = 0, ch; |
struct sockaddr_un sunaddr; |
struct sockaddr_un sunaddr; |
pid_t pid; |
pid_t pid; |
char *shell, *format, *pidstr, pidstrbuf[1 + 3 * sizeof pid]; |
char *shell, *format, *pidstr, pidstrbuf[1 + 3 * sizeof pid]; |
|
|
/* check if RSA support exists */ |
/* check if RSA support exists */ |
if (rsa_alive() == 0) { |
if (rsa_alive() == 0) { |
fprintf(stderr, |
fprintf(stderr, |
"%s: no RSA support in libssl and libcrypto. See ssl(8).\n", |
"%s: no RSA support in libssl and libcrypto. See ssl(8).\n", |
__progname); |
__progname); |
exit(1); |
exit(1); |
} |
|
|
|
while ((ch = getopt(ac, av, "cks")) != -1) |
|
{ |
|
switch (ch) |
|
{ |
|
case 'c': |
|
if (s_flag) |
|
usage(); |
|
c_flag++; |
|
break; |
|
case 'k': |
|
k_flag++; |
|
break; |
|
case 's': |
|
if (c_flag) |
|
usage(); |
|
s_flag++; |
|
break; |
|
default: |
|
usage(); |
|
} |
} |
} |
while ((ch = getopt(ac, av, "cks")) != -1) { |
ac -= optind; |
switch (ch) { |
av += optind; |
case 'c': |
|
if (s_flag) |
|
usage(); |
|
c_flag++; |
|
break; |
|
case 'k': |
|
k_flag++; |
|
break; |
|
case 's': |
|
if (c_flag) |
|
usage(); |
|
s_flag++; |
|
break; |
|
default: |
|
usage(); |
|
} |
|
} |
|
ac -= optind; |
|
av += optind; |
|
|
if (ac > 0 && (c_flag || k_flag || s_flag)) |
if (ac > 0 && (c_flag || k_flag || s_flag)) |
usage(); |
usage(); |
|
|
if (ac == 0 && !c_flag && !k_flag && !s_flag) |
if (ac == 0 && !c_flag && !k_flag && !s_flag) { |
{ |
shell = getenv("SHELL"); |
shell = getenv("SHELL"); |
if (shell != NULL && strncmp(shell + strlen(shell) - 3, "csh", 3) == 0) |
if (shell != NULL && strncmp(shell + strlen(shell) - 3, "csh", 3) == 0) |
c_flag = 1; |
c_flag = 1; |
|
} |
|
|
|
if (k_flag) |
|
{ |
|
pidstr = getenv(SSH_AGENTPID_ENV_NAME); |
|
if (pidstr == NULL) |
|
{ |
|
fprintf(stderr, "%s not set, cannot kill agent\n", |
|
SSH_AGENTPID_ENV_NAME); |
|
exit(1); |
|
} |
} |
pid = atoi(pidstr); |
if (k_flag) { |
if (pid < 1) /* XXX PID_MAX check too */ |
pidstr = getenv(SSH_AGENTPID_ENV_NAME); |
{ |
if (pidstr == NULL) { |
fprintf(stderr, "%s=\"%s\", which is not a good PID\n", |
fprintf(stderr, "%s not set, cannot kill agent\n", |
SSH_AGENTPID_ENV_NAME, pidstr); |
SSH_AGENTPID_ENV_NAME); |
exit(1); |
exit(1); |
|
} |
|
pid = atoi(pidstr); |
|
if (pid < 1) { /* XXX PID_MAX check too */ |
|
fprintf(stderr, "%s=\"%s\", which is not a good PID\n", |
|
SSH_AGENTPID_ENV_NAME, pidstr); |
|
exit(1); |
|
} |
|
if (kill(pid, SIGTERM) == -1) { |
|
perror("kill"); |
|
exit(1); |
|
} |
|
format = c_flag ? "unsetenv %s;\n" : "unset %s;\n"; |
|
printf(format, SSH_AUTHSOCKET_ENV_NAME); |
|
printf(format, SSH_AGENTPID_ENV_NAME); |
|
printf("echo Agent pid %d killed;\n", pid); |
|
exit(0); |
} |
} |
if (kill(pid, SIGTERM) == -1) |
parent_pid = getpid(); |
{ |
|
perror("kill"); |
/* Create private directory for agent socket */ |
exit(1); |
strlcpy(socket_dir, "/tmp/ssh-XXXXXXXX", sizeof socket_dir); |
|
if (mkdtemp(socket_dir) == NULL) { |
|
perror("mkdtemp: private socket dir"); |
|
exit(1); |
} |
} |
format = c_flag ? "unsetenv %s;\n" : "unset %s;\n"; |
snprintf(socket_name, sizeof socket_name, "%s/agent.%d", socket_dir, |
printf(format, SSH_AUTHSOCKET_ENV_NAME); |
parent_pid); |
printf(format, SSH_AGENTPID_ENV_NAME); |
|
printf("echo Agent pid %d killed;\n", pid); |
|
exit(0); |
|
} |
|
|
|
parent_pid = getpid(); |
/* Create socket early so it will exist before command gets run |
|
from the parent. */ |
/* Create private directory for agent socket */ |
sock = socket(AF_UNIX, SOCK_STREAM, 0); |
strlcpy(socket_dir, "/tmp/ssh-XXXXXXXX", sizeof socket_dir); |
if (sock < 0) { |
if (mkdtemp(socket_dir) == NULL) { |
perror("socket"); |
perror("mkdtemp: private socket dir"); |
cleanup_exit(1); |
exit(1); |
|
} |
|
snprintf(socket_name, sizeof socket_name, "%s/agent.%d", socket_dir, |
|
parent_pid); |
|
|
|
/* Create socket early so it will exist before command gets run from |
|
the parent. */ |
|
sock = socket(AF_UNIX, SOCK_STREAM, 0); |
|
if (sock < 0) |
|
{ |
|
perror("socket"); |
|
cleanup_exit(1); |
|
} |
|
memset(&sunaddr, 0, sizeof(sunaddr)); |
|
sunaddr.sun_family = AF_UNIX; |
|
strlcpy(sunaddr.sun_path, socket_name, sizeof(sunaddr.sun_path)); |
|
if (bind(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) < 0) |
|
{ |
|
perror("bind"); |
|
cleanup_exit(1); |
|
} |
|
if (listen(sock, 5) < 0) |
|
{ |
|
perror("listen"); |
|
cleanup_exit(1); |
|
} |
|
|
|
/* Fork, and have the parent execute the command, if any, or present the |
|
socket data. The child continues as the authentication agent. */ |
|
pid = fork(); |
|
if (pid == -1) |
|
{ |
|
perror("fork"); |
|
exit(1); |
|
} |
|
if (pid != 0) |
|
{ /* Parent - execute the given command. */ |
|
close(sock); |
|
snprintf(pidstrbuf, sizeof pidstrbuf, "%d", pid); |
|
if (ac == 0) |
|
{ |
|
format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n"; |
|
printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name, |
|
SSH_AUTHSOCKET_ENV_NAME); |
|
printf(format, SSH_AGENTPID_ENV_NAME, pidstrbuf, |
|
SSH_AGENTPID_ENV_NAME); |
|
printf("echo Agent pid %d;\n", pid); |
|
exit(0); |
|
} |
} |
|
memset(&sunaddr, 0, sizeof(sunaddr)); |
|
sunaddr.sun_family = AF_UNIX; |
|
strlcpy(sunaddr.sun_path, socket_name, sizeof(sunaddr.sun_path)); |
|
if (bind(sock, (struct sockaddr *) & sunaddr, sizeof(sunaddr)) < 0) { |
|
perror("bind"); |
|
cleanup_exit(1); |
|
} |
|
if (listen(sock, 5) < 0) { |
|
perror("listen"); |
|
cleanup_exit(1); |
|
} |
|
/* Fork, and have the parent execute the command, if any, or |
|
present the socket data. The child continues as the |
|
authentication agent. */ |
|
pid = fork(); |
|
if (pid == -1) { |
|
perror("fork"); |
|
exit(1); |
|
} |
|
if (pid != 0) { /* Parent - execute the given command. */ |
|
close(sock); |
|
snprintf(pidstrbuf, sizeof pidstrbuf, "%d", pid); |
|
if (ac == 0) { |
|
format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n"; |
|
printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name, |
|
SSH_AUTHSOCKET_ENV_NAME); |
|
printf(format, SSH_AGENTPID_ENV_NAME, pidstrbuf, |
|
SSH_AGENTPID_ENV_NAME); |
|
printf("echo Agent pid %d;\n", pid); |
|
exit(0); |
|
} |
|
setenv(SSH_AUTHSOCKET_ENV_NAME, socket_name, 1); |
|
setenv(SSH_AGENTPID_ENV_NAME, pidstrbuf, 1); |
|
execvp(av[0], av); |
|
perror(av[0]); |
|
exit(1); |
|
} |
|
close(0); |
|
close(1); |
|
close(2); |
|
|
setenv(SSH_AUTHSOCKET_ENV_NAME, socket_name, 1); |
if (setsid() == -1) { |
setenv(SSH_AGENTPID_ENV_NAME, pidstrbuf, 1); |
perror("setsid"); |
execvp(av[0], av); |
cleanup_exit(1); |
perror(av[0]); |
|
exit(1); |
|
} |
|
|
|
close(0); |
|
close(1); |
|
close(2); |
|
|
|
if (setsid() == -1) |
|
{ |
|
perror("setsid"); |
|
cleanup_exit(1); |
|
} |
|
|
|
if (atexit(cleanup_socket) < 0) |
|
{ |
|
perror("atexit"); |
|
cleanup_exit(1); |
|
} |
|
|
|
new_socket(AUTH_SOCKET, sock); |
|
if (ac > 0) |
|
{ |
|
signal(SIGALRM, check_parent_exists); |
|
alarm(10); |
|
} |
|
|
|
signal(SIGINT, SIG_IGN); |
|
signal(SIGPIPE, SIG_IGN); |
|
while (1) |
|
{ |
|
FD_ZERO(&readset); |
|
FD_ZERO(&writeset); |
|
prepare_select(&readset, &writeset); |
|
if (select(max_fd + 1, &readset, &writeset, NULL, NULL) < 0) |
|
{ |
|
if (errno == EINTR) |
|
continue; |
|
exit(1); |
|
} |
} |
after_select(&readset, &writeset); |
if (atexit(cleanup_socket) < 0) { |
} |
perror("atexit"); |
/*NOTREACHED*/ |
cleanup_exit(1); |
|
} |
|
new_socket(AUTH_SOCKET, sock); |
|
if (ac > 0) { |
|
signal(SIGALRM, check_parent_exists); |
|
alarm(10); |
|
} |
|
signal(SIGINT, SIG_IGN); |
|
signal(SIGPIPE, SIG_IGN); |
|
while (1) { |
|
FD_ZERO(&readset); |
|
FD_ZERO(&writeset); |
|
prepare_select(&readset, &writeset); |
|
if (select(max_fd + 1, &readset, &writeset, NULL, NULL) < 0) { |
|
if (errno == EINTR) |
|
continue; |
|
exit(1); |
|
} |
|
after_select(&readset, &writeset); |
|
} |
|
/* NOTREACHED */ |
} |
} |