version 1.72.2.3, 2001/11/15 22:51:15 |
version 1.72.2.4, 2002/03/09 00:20:45 |
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#include "includes.h" |
#include "includes.h" |
RCSID("$OpenBSD$"); |
RCSID("$OpenBSD$"); |
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#include <openssl/bn.h> |
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#include <openssl/md5.h> |
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#include <openssl/dh.h> |
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#include <openssl/hmac.h> |
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#include "ssh.h" |
#include "ssh.h" |
#include "ssh2.h" |
#include "ssh2.h" |
#include "xmalloc.h" |
#include "xmalloc.h" |
#include "rsa.h" |
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#include "buffer.h" |
#include "buffer.h" |
#include "packet.h" |
#include "packet.h" |
#include "uidswap.h" |
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#include "compat.h" |
#include "compat.h" |
#include "bufaux.h" |
#include "bufaux.h" |
#include "cipher.h" |
#include "cipher.h" |
#include "kex.h" |
#include "kex.h" |
#include "myproposal.h" |
#include "myproposal.h" |
#include "key.h" |
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#include "sshconnect.h" |
#include "sshconnect.h" |
#include "authfile.h" |
#include "authfile.h" |
#include "dh.h" |
#include "dh.h" |
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myproposal[PROPOSAL_MAC_ALGS_STOC] = options.macs; |
myproposal[PROPOSAL_MAC_ALGS_STOC] = options.macs; |
} |
} |
if (options.hostkeyalgorithms != NULL) |
if (options.hostkeyalgorithms != NULL) |
myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = |
myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = |
options.hostkeyalgorithms; |
options.hostkeyalgorithms; |
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/* start key exchange */ |
/* start key exchange */ |
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typedef int sign_cb_fn( |
typedef int sign_cb_fn( |
Authctxt *authctxt, Key *key, |
Authctxt *authctxt, Key *key, |
u_char **sigp, int *lenp, u_char *data, int datalen); |
u_char **sigp, u_int *lenp, u_char *data, u_int datalen); |
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struct Authctxt { |
struct Authctxt { |
const char *server_user; |
const char *server_user; |
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int *batch_flag; /* flag in option struct that disables method */ |
int *batch_flag; /* flag in option struct that disables method */ |
}; |
}; |
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void input_userauth_success(int type, int plen, void *ctxt); |
void input_userauth_success(int, u_int32_t, void *); |
void input_userauth_failure(int type, int plen, void *ctxt); |
void input_userauth_failure(int, u_int32_t, void *); |
void input_userauth_banner(int type, int plen, void *ctxt); |
void input_userauth_banner(int, u_int32_t, void *); |
void input_userauth_error(int type, int plen, void *ctxt); |
void input_userauth_error(int, u_int32_t, void *); |
void input_userauth_info_req(int type, int plen, void *ctxt); |
void input_userauth_info_req(int, u_int32_t, void *); |
void input_userauth_pk_ok(int type, int plen, void *ctxt); |
void input_userauth_pk_ok(int, u_int32_t, void *); |
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int userauth_none(Authctxt *authctxt); |
int userauth_none(Authctxt *); |
int userauth_pubkey(Authctxt *authctxt); |
int userauth_pubkey(Authctxt *); |
int userauth_passwd(Authctxt *authctxt); |
int userauth_passwd(Authctxt *); |
int userauth_kbdint(Authctxt *authctxt); |
int userauth_kbdint(Authctxt *); |
int userauth_hostbased(Authctxt *authctxt); |
int userauth_hostbased(Authctxt *); |
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void userauth(Authctxt *authctxt, char *authlist); |
void userauth(Authctxt *, char *); |
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static int sign_and_send_pubkey(Authctxt *, Key *, sign_cb_fn *); |
static int sign_and_send_pubkey(Authctxt *, Key *, sign_cb_fn *); |
static void clear_auth_state(Authctxt *); |
static void clear_auth_state(Authctxt *); |
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{ |
{ |
Authctxt authctxt; |
Authctxt authctxt; |
int type; |
int type; |
int plen; |
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if (options.challenge_response_authentication) |
if (options.challenge_response_authentication) |
options.kbd_interactive_authentication = 1; |
options.kbd_interactive_authentication = 1; |
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packet_put_cstring("ssh-userauth"); |
packet_put_cstring("ssh-userauth"); |
packet_send(); |
packet_send(); |
packet_write_wait(); |
packet_write_wait(); |
type = packet_read(&plen); |
type = packet_read(); |
if (type != SSH2_MSG_SERVICE_ACCEPT) { |
if (type != SSH2_MSG_SERVICE_ACCEPT) { |
fatal("denied SSH2_MSG_SERVICE_ACCEPT: %d", type); |
fatal("denied SSH2_MSG_SERVICE_ACCEPT: %d", type); |
} |
} |
if (packet_remaining() > 0) { |
if (packet_remaining() > 0) { |
char *reply = packet_get_string(&plen); |
char *reply = packet_get_string(NULL); |
debug("service_accept: %s", reply); |
debug("service_accept: %s", reply); |
xfree(reply); |
xfree(reply); |
} else { |
} else { |
debug("buggy server: service_accept w/o service"); |
debug("buggy server: service_accept w/o service"); |
} |
} |
packet_done(); |
packet_check_eom(); |
debug("got SSH2_MSG_SERVICE_ACCEPT"); |
debug("got SSH2_MSG_SERVICE_ACCEPT"); |
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if (options.preferred_authentications == NULL) |
if (options.preferred_authentications == NULL) |
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} |
} |
} |
} |
void |
void |
input_userauth_error(int type, int plen, void *ctxt) |
input_userauth_error(int type, u_int32_t seq, void *ctxt) |
{ |
{ |
fatal("input_userauth_error: bad message during authentication: " |
fatal("input_userauth_error: bad message during authentication: " |
"type %d", type); |
"type %d", type); |
} |
} |
void |
void |
input_userauth_banner(int type, int plen, void *ctxt) |
input_userauth_banner(int type, u_int32_t seq, void *ctxt) |
{ |
{ |
char *msg, *lang; |
char *msg, *lang; |
debug3("input_userauth_banner"); |
debug3("input_userauth_banner"); |
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xfree(lang); |
xfree(lang); |
} |
} |
void |
void |
input_userauth_success(int type, int plen, void *ctxt) |
input_userauth_success(int type, u_int32_t seq, void *ctxt) |
{ |
{ |
Authctxt *authctxt = ctxt; |
Authctxt *authctxt = ctxt; |
if (authctxt == NULL) |
if (authctxt == NULL) |
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authctxt->success = 1; /* break out */ |
authctxt->success = 1; /* break out */ |
} |
} |
void |
void |
input_userauth_failure(int type, int plen, void *ctxt) |
input_userauth_failure(int type, u_int32_t seq, void *ctxt) |
{ |
{ |
Authctxt *authctxt = ctxt; |
Authctxt *authctxt = ctxt; |
char *authlist = NULL; |
char *authlist = NULL; |
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authlist = packet_get_string(NULL); |
authlist = packet_get_string(NULL); |
partial = packet_get_char(); |
partial = packet_get_char(); |
packet_done(); |
packet_check_eom(); |
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if (partial != 0) |
if (partial != 0) |
log("Authenticated with partial success."); |
log("Authenticated with partial success."); |
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userauth(authctxt, authlist); |
userauth(authctxt, authlist); |
} |
} |
void |
void |
input_userauth_pk_ok(int type, int plen, void *ctxt) |
input_userauth_pk_ok(int type, u_int32_t seq, void *ctxt) |
{ |
{ |
Authctxt *authctxt = ctxt; |
Authctxt *authctxt = ctxt; |
Key *key = NULL; |
Key *key = NULL; |
Buffer b; |
Buffer b; |
int alen, blen, sent = 0; |
int pktype, sent = 0; |
char *pkalg, *pkblob, *fp; |
u_int alen, blen; |
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char *pkalg, *fp; |
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u_char *pkblob; |
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if (authctxt == NULL) |
if (authctxt == NULL) |
fatal("input_userauth_pk_ok: no authentication context"); |
fatal("input_userauth_pk_ok: no authentication context"); |
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pkalg = packet_get_string(&alen); |
pkalg = packet_get_string(&alen); |
pkblob = packet_get_string(&blen); |
pkblob = packet_get_string(&blen); |
} |
} |
packet_done(); |
packet_check_eom(); |
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debug("input_userauth_pk_ok: pkalg %s blen %d lastkey %p hint %d", |
debug("input_userauth_pk_ok: pkalg %s blen %d lastkey %p hint %d", |
pkalg, blen, authctxt->last_key, authctxt->last_key_hint); |
pkalg, blen, authctxt->last_key, authctxt->last_key_hint); |
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debug("no last key or no sign cb"); |
debug("no last key or no sign cb"); |
break; |
break; |
} |
} |
if (key_type_from_name(pkalg) == KEY_UNSPEC) { |
if ((pktype = key_type_from_name(pkalg)) == KEY_UNSPEC) { |
debug("unknown pkalg %s", pkalg); |
debug("unknown pkalg %s", pkalg); |
break; |
break; |
} |
} |
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debug("no key from blob. pkalg %s", pkalg); |
debug("no key from blob. pkalg %s", pkalg); |
break; |
break; |
} |
} |
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if (key->type != pktype) { |
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error("input_userauth_pk_ok: type mismatch " |
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"for decoded key (received %d, expected %d)", |
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key->type, pktype); |
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break; |
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} |
fp = key_fingerprint(key, SSH_FP_MD5, SSH_FP_HEX); |
fp = key_fingerprint(key, SSH_FP_MD5, SSH_FP_HEX); |
debug2("input_userauth_pk_ok: fp %s", fp); |
debug2("input_userauth_pk_ok: fp %s", fp); |
xfree(fp); |
xfree(fp); |
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} |
} |
sent = sign_and_send_pubkey(authctxt, key, |
sent = sign_and_send_pubkey(authctxt, key, |
authctxt->last_key_sign); |
authctxt->last_key_sign); |
} while(0); |
} while (0); |
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if (key != NULL) |
if (key != NULL) |
key_free(key); |
key_free(key); |
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if (attempt++ >= options.number_of_password_prompts) |
if (attempt++ >= options.number_of_password_prompts) |
return 0; |
return 0; |
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if(attempt != 1) |
if (attempt != 1) |
error("Permission denied, please try again."); |
error("Permission denied, please try again."); |
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snprintf(prompt, sizeof(prompt), "%.30s@%.128s's password: ", |
snprintf(prompt, sizeof(prompt), "%.30s@%.128s's password: ", |
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{ |
{ |
Buffer b; |
Buffer b; |
u_char *blob, *signature; |
u_char *blob, *signature; |
int bloblen, slen; |
u_int bloblen, slen; |
int skip = 0; |
int skip = 0; |
int ret = -1; |
int ret = -1; |
int have_sig = 1; |
int have_sig = 1; |
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int hint) |
int hint) |
{ |
{ |
u_char *blob; |
u_char *blob; |
int bloblen, have_sig = 0; |
u_int bloblen, have_sig = 0; |
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debug3("send_pubkey_test"); |
debug3("send_pubkey_test"); |
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if (options.batch_mode) |
if (options.batch_mode) |
return NULL; |
return NULL; |
snprintf(prompt, sizeof prompt, |
snprintf(prompt, sizeof prompt, |
"Enter passphrase for key '%.100s': ", filename); |
"Enter passphrase for key '%.100s': ", filename); |
for (i = 0; i < options.number_of_password_prompts; i++) { |
for (i = 0; i < options.number_of_password_prompts; i++) { |
passphrase = read_passphrase(prompt, 0); |
passphrase = read_passphrase(prompt, 0); |
if (strcmp(passphrase, "") != 0) { |
if (strcmp(passphrase, "") != 0) { |
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} |
} |
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static int |
static int |
identity_sign_cb(Authctxt *authctxt, Key *key, u_char **sigp, int *lenp, |
identity_sign_cb(Authctxt *authctxt, Key *key, u_char **sigp, u_int *lenp, |
u_char *data, int datalen) |
u_char *data, u_int datalen) |
{ |
{ |
Key *private; |
Key *private; |
int idx, ret; |
int idx, ret; |
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return -1; |
return -1; |
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/* private key is stored in external hardware */ |
/* private key is stored in external hardware */ |
if (options.identity_keys[idx]->flags & KEY_FLAG_EXT) |
if (options.identity_keys[idx]->flags & KEY_FLAG_EXT) |
return key_sign(options.identity_keys[idx], sigp, lenp, data, datalen); |
return key_sign(options.identity_keys[idx], sigp, lenp, data, datalen); |
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private = load_identity_file(options.identity_files[idx]); |
private = load_identity_file(options.identity_files[idx]); |
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} |
} |
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static int |
static int |
agent_sign_cb(Authctxt *authctxt, Key *key, u_char **sigp, int *lenp, |
agent_sign_cb(Authctxt *authctxt, Key *key, u_char **sigp, u_int *lenp, |
u_char *data, int datalen) |
u_char *data, u_int datalen) |
{ |
{ |
return ssh_agent_sign(authctxt->agent, key, sigp, lenp, data, datalen); |
return ssh_agent_sign(authctxt->agent, key, sigp, lenp, data, datalen); |
} |
} |
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static int |
static int |
key_sign_cb(Authctxt *authctxt, Key *key, u_char **sigp, int *lenp, |
key_sign_cb(Authctxt *authctxt, Key *key, u_char **sigp, u_int *lenp, |
u_char *data, int datalen) |
u_char *data, u_int datalen) |
{ |
{ |
return key_sign(key, sigp, lenp, data, datalen); |
return key_sign(key, sigp, lenp, data, datalen); |
} |
} |
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if (authctxt->agent != NULL) { |
if (authctxt->agent != NULL) { |
do { |
do { |
sent = userauth_pubkey_agent(authctxt); |
sent = userauth_pubkey_agent(authctxt); |
} while(!sent && authctxt->agent->howmany > 0); |
} while (!sent && authctxt->agent->howmany > 0); |
} |
} |
while (!sent && idx < options.num_identity_files) { |
while (!sent && idx < options.num_identity_files) { |
key = options.identity_keys[idx]; |
key = options.identity_keys[idx]; |
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* parse INFO_REQUEST, prompt user and send INFO_RESPONSE |
* parse INFO_REQUEST, prompt user and send INFO_RESPONSE |
*/ |
*/ |
void |
void |
input_userauth_info_req(int type, int plen, void *ctxt) |
input_userauth_info_req(int type, u_int32_t seq, void *ctxt) |
{ |
{ |
Authctxt *authctxt = ctxt; |
Authctxt *authctxt = ctxt; |
char *name, *inst, *lang, *prompt, *response; |
char *name, *inst, *lang, *prompt, *response; |
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xfree(response); |
xfree(response); |
xfree(prompt); |
xfree(prompt); |
} |
} |
packet_done(); /* done with parsing incoming message. */ |
packet_check_eom(); /* done with parsing incoming message. */ |
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packet_add_padding(64); |
packet_add_padding(64); |
packet_send(); |
packet_send(); |
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{ |
{ |
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char *name = NULL; |
char *name = NULL; |
int next; |
u_int next; |
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/* Use a suitable default if we're passed a nil list. */ |
/* Use a suitable default if we're passed a nil list. */ |
if (authlist == NULL || strlen(authlist) == 0) |
if (authlist == NULL || strlen(authlist) == 0) |
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} |
} |
} |
} |
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#define DELIM "," |
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static char * |
static char * |
authmethods_get(void) |
authmethods_get(void) |
{ |
{ |
Authmethod *method = NULL; |
Authmethod *method = NULL; |
char buf[1024]; |
Buffer b; |
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char *list; |
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buf[0] = '\0'; |
buffer_init(&b); |
for (method = authmethods; method->name != NULL; method++) { |
for (method = authmethods; method->name != NULL; method++) { |
if (authmethod_is_enabled(method)) { |
if (authmethod_is_enabled(method)) { |
if (buf[0] != '\0') |
if (buffer_len(&b) > 0) |
strlcat(buf, DELIM, sizeof buf); |
buffer_append(&b, ",", 1); |
strlcat(buf, method->name, sizeof buf); |
buffer_append(&b, method->name, strlen(method->name)); |
} |
} |
} |
} |
return xstrdup(buf); |
buffer_append(&b, "\0", 1); |
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list = xstrdup(buffer_ptr(&b)); |
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buffer_free(&b); |
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return list; |
} |
} |