version 1.8.2.4, 2001/05/07 21:09:37 |
version 1.8.2.5, 2001/09/27 00:15:43 |
|
|
#ifdef KRB4 |
#ifdef KRB4 |
#include <krb.h> |
#include <krb.h> |
#endif |
#endif |
|
#ifdef KRB5 |
|
#include <krb5.h> |
|
#endif |
#ifdef AFS |
#ifdef AFS |
#include <kafs.h> |
#include <kafs.h> |
#include "radix.h" |
#include "radix.h" |
|
|
#include "readpass.h" |
#include "readpass.h" |
#include "cipher.h" |
#include "cipher.h" |
#include "canohost.h" |
#include "canohost.h" |
|
#include "auth.h" |
|
|
/* Session id for the current session. */ |
/* Session id for the current session. */ |
u_char session_id[16]; |
u_char session_id[16]; |
|
|
* Checks if the user has an authentication agent, and if so, tries to |
* Checks if the user has an authentication agent, and if so, tries to |
* authenticate using the agent. |
* authenticate using the agent. |
*/ |
*/ |
int |
static int |
try_agent_authentication(void) |
try_agent_authentication(void) |
{ |
{ |
int type; |
int type; |
|
|
* Computes the proper response to a RSA challenge, and sends the response to |
* Computes the proper response to a RSA challenge, and sends the response to |
* the server. |
* the server. |
*/ |
*/ |
void |
static void |
respond_to_rsa_challenge(BIGNUM * challenge, RSA * prv) |
respond_to_rsa_challenge(BIGNUM * challenge, RSA * prv) |
{ |
{ |
u_char buf[32], response[16]; |
u_char buf[32], response[16]; |
|
|
* Checks if the user has authentication file, and if so, tries to authenticate |
* Checks if the user has authentication file, and if so, tries to authenticate |
* the user using it. |
* the user using it. |
*/ |
*/ |
int |
static int |
try_rsa_authentication(const char *authfile) |
try_rsa_authentication(int idx) |
{ |
{ |
BIGNUM *challenge; |
BIGNUM *challenge; |
Key *public; |
Key *public, *private; |
Key *private; |
char buf[300], *passphrase, *comment, *authfile; |
char *passphrase, *comment; |
int i, type, quit, plen, clen; |
int type, i; |
|
int plen, clen; |
|
|
|
/* Try to load identification for the authentication key. */ |
public = options.identity_keys[idx]; |
/* XXKEYLOAD */ |
authfile = options.identity_files[idx]; |
public = key_load_public_type(KEY_RSA1, authfile, &comment); |
comment = xstrdup(authfile); |
if (public == NULL) { |
|
/* Could not load it. Fail. */ |
|
return 0; |
|
} |
|
debug("Trying RSA authentication with key '%.100s'", comment); |
debug("Trying RSA authentication with key '%.100s'", comment); |
|
|
/* Tell the server that we are willing to authenticate using this key. */ |
/* Tell the server that we are willing to authenticate using this key. */ |
|
|
packet_send(); |
packet_send(); |
packet_write_wait(); |
packet_write_wait(); |
|
|
/* We no longer need the public key. */ |
|
key_free(public); |
|
|
|
/* Wait for server's response. */ |
/* Wait for server's response. */ |
type = packet_read(&plen); |
type = packet_read(&plen); |
|
|
|
|
debug("Received RSA challenge from server."); |
debug("Received RSA challenge from server."); |
|
|
/* |
/* |
* Load the private key. Try first with empty passphrase; if it |
* If the key is not stored in external hardware, we have to |
|
* load the private key. Try first with empty passphrase; if it |
* fails, ask for a passphrase. |
* fails, ask for a passphrase. |
*/ |
*/ |
private = key_load_private_type(KEY_RSA1, authfile, "", NULL); |
if (public->flags && KEY_FLAG_EXT) |
if (private == NULL) { |
private = public; |
char buf[300]; |
else |
snprintf(buf, sizeof buf, "Enter passphrase for RSA key '%.100s': ", |
private = key_load_private_type(KEY_RSA1, authfile, "", NULL); |
comment); |
if (private == NULL && !options.batch_mode) { |
if (!options.batch_mode) |
snprintf(buf, sizeof(buf), |
|
"Enter passphrase for RSA key '%.100s': ", comment); |
|
for (i = 0; i < options.number_of_password_prompts; i++) { |
passphrase = read_passphrase(buf, 0); |
passphrase = read_passphrase(buf, 0); |
else { |
if (strcmp(passphrase, "") != 0) { |
debug("Will not query passphrase for %.100s in batch mode.", |
private = key_load_private_type(KEY_RSA1, |
comment); |
authfile, passphrase, NULL); |
passphrase = xstrdup(""); |
quit = 0; |
} |
} else { |
|
debug2("no passphrase given, try next key"); |
/* Load the authentication file using the pasphrase. */ |
quit = 1; |
private = key_load_private_type(KEY_RSA1, authfile, passphrase, NULL); |
} |
if (private == NULL) { |
|
memset(passphrase, 0, strlen(passphrase)); |
memset(passphrase, 0, strlen(passphrase)); |
xfree(passphrase); |
xfree(passphrase); |
error("Bad passphrase."); |
if (private != NULL || quit) |
|
break; |
/* Send a dummy response packet to avoid protocol error. */ |
debug2("bad passphrase given, try again..."); |
packet_start(SSH_CMSG_AUTH_RSA_RESPONSE); |
|
for (i = 0; i < 16; i++) |
|
packet_put_char(0); |
|
packet_send(); |
|
packet_write_wait(); |
|
|
|
/* Expect the server to reject it... */ |
|
packet_read_expect(&plen, SSH_SMSG_FAILURE); |
|
xfree(comment); |
|
BN_clear_free(challenge); |
|
return 0; |
|
} |
} |
/* Destroy the passphrase. */ |
|
memset(passphrase, 0, strlen(passphrase)); |
|
xfree(passphrase); |
|
} |
} |
/* We no longer need the comment. */ |
/* We no longer need the comment. */ |
xfree(comment); |
xfree(comment); |
|
|
|
if (private == NULL) { |
|
if (!options.batch_mode) |
|
error("Bad passphrase."); |
|
|
|
/* Send a dummy response packet to avoid protocol error. */ |
|
packet_start(SSH_CMSG_AUTH_RSA_RESPONSE); |
|
for (i = 0; i < 16; i++) |
|
packet_put_char(0); |
|
packet_send(); |
|
packet_write_wait(); |
|
|
|
/* Expect the server to reject it... */ |
|
packet_read_expect(&plen, SSH_SMSG_FAILURE); |
|
BN_clear_free(challenge); |
|
return 0; |
|
} |
|
|
/* Compute and send a response to the challenge. */ |
/* Compute and send a response to the challenge. */ |
respond_to_rsa_challenge(challenge, private->rsa); |
respond_to_rsa_challenge(challenge, private->rsa); |
|
|
/* Destroy the private key. */ |
/* Destroy the private key unless it in external hardware. */ |
key_free(private); |
if (!(private->flags & KEY_FLAG_EXT)) |
|
key_free(private); |
|
|
/* We no longer need the challenge. */ |
/* We no longer need the challenge. */ |
BN_clear_free(challenge); |
BN_clear_free(challenge); |
|
|
* Tries to authenticate the user using combined rhosts or /etc/hosts.equiv |
* Tries to authenticate the user using combined rhosts or /etc/hosts.equiv |
* authentication and RSA host authentication. |
* authentication and RSA host authentication. |
*/ |
*/ |
int |
static int |
try_rhosts_rsa_authentication(const char *local_user, Key * host_key) |
try_rhosts_rsa_authentication(const char *local_user, Key * host_key) |
{ |
{ |
int type; |
int type; |
|
|
|
|
/* Tell the server that we are willing to authenticate using this key. */ |
/* Tell the server that we are willing to authenticate using this key. */ |
packet_start(SSH_CMSG_AUTH_RHOSTS_RSA); |
packet_start(SSH_CMSG_AUTH_RHOSTS_RSA); |
packet_put_string(local_user, strlen(local_user)); |
packet_put_cstring(local_user); |
packet_put_int(BN_num_bits(host_key->rsa->n)); |
packet_put_int(BN_num_bits(host_key->rsa->n)); |
packet_put_bignum(host_key->rsa->e); |
packet_put_bignum(host_key->rsa->e); |
packet_put_bignum(host_key->rsa->n); |
packet_put_bignum(host_key->rsa->n); |
|
|
} |
} |
|
|
#ifdef KRB4 |
#ifdef KRB4 |
int |
static int |
try_kerberos_authentication(void) |
try_krb4_authentication(void) |
{ |
{ |
KTEXT_ST auth; /* Kerberos data */ |
KTEXT_ST auth; /* Kerberos data */ |
char *reply; |
char *reply; |
|
|
/* Don't do anything if we don't have any tickets. */ |
/* Don't do anything if we don't have any tickets. */ |
if (stat(tkt_string(), &st) < 0) |
if (stat(tkt_string(), &st) < 0) |
return 0; |
return 0; |
|
|
strncpy(inst, (char *) krb_get_phost(get_canonical_hostname(1)), INST_SZ); |
strlcpy(inst, (char *)krb_get_phost(get_canonical_hostname(1)), |
|
INST_SZ); |
realm = (char *) krb_realmofhost(get_canonical_hostname(1)); |
|
|
realm = (char *)krb_realmofhost(get_canonical_hostname(1)); |
if (!realm) { |
if (!realm) { |
debug("Kerberos V4: no realm for %s", get_canonical_hostname(1)); |
debug("Kerberos v4: no realm for %s", get_canonical_hostname(1)); |
return 0; |
return 0; |
} |
} |
/* This can really be anything. */ |
/* This can really be anything. */ |
checksum = (u_long) getpid(); |
checksum = (u_long)getpid(); |
|
|
r = krb_mk_req(&auth, KRB4_SERVICE_NAME, inst, realm, checksum); |
r = krb_mk_req(&auth, KRB4_SERVICE_NAME, inst, realm, checksum); |
if (r != KSUCCESS) { |
if (r != KSUCCESS) { |
debug("Kerberos V4 krb_mk_req failed: %s", krb_err_txt[r]); |
debug("Kerberos v4 krb_mk_req failed: %s", krb_err_txt[r]); |
return 0; |
return 0; |
} |
} |
/* Get session key to decrypt the server's reply with. */ |
/* Get session key to decrypt the server's reply with. */ |
|
|
return 0; |
return 0; |
} |
} |
des_key_sched((des_cblock *) cred.session, schedule); |
des_key_sched((des_cblock *) cred.session, schedule); |
|
|
/* Send authentication info to server. */ |
/* Send authentication info to server. */ |
packet_start(SSH_CMSG_AUTH_KERBEROS); |
packet_start(SSH_CMSG_AUTH_KERBEROS); |
packet_put_string((char *) auth.dat, auth.length); |
packet_put_string((char *) auth.dat, auth.length); |
packet_send(); |
packet_send(); |
packet_write_wait(); |
packet_write_wait(); |
|
|
/* Zero the buffer. */ |
/* Zero the buffer. */ |
(void) memset(auth.dat, 0, MAX_KTXT_LEN); |
(void) memset(auth.dat, 0, MAX_KTXT_LEN); |
|
|
slen = sizeof(local); |
slen = sizeof(local); |
memset(&local, 0, sizeof(local)); |
memset(&local, 0, sizeof(local)); |
if (getsockname(packet_get_connection_in(), |
if (getsockname(packet_get_connection_in(), |
(struct sockaddr *) & local, &slen) < 0) |
(struct sockaddr *)&local, &slen) < 0) |
debug("getsockname failed: %s", strerror(errno)); |
debug("getsockname failed: %s", strerror(errno)); |
|
|
slen = sizeof(foreign); |
slen = sizeof(foreign); |
memset(&foreign, 0, sizeof(foreign)); |
memset(&foreign, 0, sizeof(foreign)); |
if (getpeername(packet_get_connection_in(), |
if (getpeername(packet_get_connection_in(), |
(struct sockaddr *) & foreign, &slen) < 0) { |
(struct sockaddr *)&foreign, &slen) < 0) { |
debug("getpeername failed: %s", strerror(errno)); |
debug("getpeername failed: %s", strerror(errno)); |
fatal_cleanup(); |
fatal_cleanup(); |
} |
} |
|
|
switch (type) { |
switch (type) { |
case SSH_SMSG_FAILURE: |
case SSH_SMSG_FAILURE: |
/* Should really be SSH_SMSG_AUTH_KERBEROS_FAILURE */ |
/* Should really be SSH_SMSG_AUTH_KERBEROS_FAILURE */ |
debug("Kerberos V4 authentication failed."); |
debug("Kerberos v4 authentication failed."); |
return 0; |
return 0; |
break; |
break; |
|
|
case SSH_SMSG_AUTH_KERBEROS_RESPONSE: |
case SSH_SMSG_AUTH_KERBEROS_RESPONSE: |
/* SSH_SMSG_AUTH_KERBEROS_SUCCESS */ |
/* SSH_SMSG_AUTH_KERBEROS_SUCCESS */ |
debug("Kerberos V4 authentication accepted."); |
debug("Kerberos v4 authentication accepted."); |
|
|
/* Get server's response. */ |
/* Get server's response. */ |
reply = packet_get_string((u_int *) &auth.length); |
reply = packet_get_string((u_int *) &auth.length); |
memcpy(auth.dat, reply, auth.length); |
memcpy(auth.dat, reply, auth.length); |
xfree(reply); |
xfree(reply); |
|
|
packet_integrity_check(plen, 4 + auth.length, type); |
packet_integrity_check(plen, 4 + auth.length, type); |
|
|
/* |
/* |
* If his response isn't properly encrypted with the session |
* If his response isn't properly encrypted with the session |
* key, and the decrypted checksum fails to match, he's |
* key, and the decrypted checksum fails to match, he's |
* bogus. Bail out. |
* bogus. Bail out. |
*/ |
*/ |
r = krb_rd_priv(auth.dat, auth.length, schedule, &cred.session, |
r = krb_rd_priv(auth.dat, auth.length, schedule, &cred.session, |
&foreign, &local, &msg_data); |
&foreign, &local, &msg_data); |
if (r != KSUCCESS) { |
if (r != KSUCCESS) { |
debug("Kerberos V4 krb_rd_priv failed: %s", krb_err_txt[r]); |
debug("Kerberos v4 krb_rd_priv failed: %s", |
packet_disconnect("Kerberos V4 challenge failed!"); |
krb_err_txt[r]); |
|
packet_disconnect("Kerberos v4 challenge failed!"); |
} |
} |
/* Fetch the (incremented) checksum that we supplied in the request. */ |
/* Fetch the (incremented) checksum that we supplied in the request. */ |
(void) memcpy((char *) &cksum, (char *) msg_data.app_data, sizeof(cksum)); |
memcpy((char *)&cksum, (char *)msg_data.app_data, |
|
sizeof(cksum)); |
cksum = ntohl(cksum); |
cksum = ntohl(cksum); |
|
|
/* If it matches, we're golden. */ |
/* If it matches, we're golden. */ |
if (cksum == checksum + 1) { |
if (cksum == checksum + 1) { |
debug("Kerberos V4 challenge successful."); |
debug("Kerberos v4 challenge successful."); |
return 1; |
return 1; |
} else |
} else |
packet_disconnect("Kerberos V4 challenge failed!"); |
packet_disconnect("Kerberos v4 challenge failed!"); |
break; |
break; |
|
|
default: |
default: |
packet_disconnect("Protocol error on Kerberos V4 response: %d", type); |
packet_disconnect("Protocol error on Kerberos v4 response: %d", type); |
} |
} |
return 0; |
return 0; |
} |
} |
|
|
#endif /* KRB4 */ |
#endif /* KRB4 */ |
|
|
|
#ifdef KRB5 |
|
static int |
|
try_krb5_authentication(krb5_context *context, krb5_auth_context *auth_context) |
|
{ |
|
krb5_error_code problem; |
|
const char *tkfile; |
|
struct stat buf; |
|
krb5_ccache ccache = NULL; |
|
const char *remotehost; |
|
krb5_data ap; |
|
int type, payload_len; |
|
krb5_ap_rep_enc_part *reply = NULL; |
|
int ret; |
|
|
|
memset(&ap, 0, sizeof(ap)); |
|
|
|
problem = krb5_init_context(context); |
|
if (problem) { |
|
debug("Kerberos v5: krb5_init_context failed"); |
|
ret = 0; |
|
goto out; |
|
} |
|
|
|
tkfile = krb5_cc_default_name(*context); |
|
if (strncmp(tkfile, "FILE:", 5) == 0) |
|
tkfile += 5; |
|
|
|
if (stat(tkfile, &buf) == 0 && getuid() != buf.st_uid) { |
|
debug("Kerberos v5: could not get default ccache (permission denied)."); |
|
ret = 0; |
|
goto out; |
|
} |
|
|
|
problem = krb5_cc_default(*context, &ccache); |
|
if (problem) { |
|
debug("Kerberos v5: krb5_cc_default failed: %s", |
|
krb5_get_err_text(*context, problem)); |
|
ret = 0; |
|
goto out; |
|
} |
|
|
|
remotehost = get_canonical_hostname(1); |
|
|
|
problem = krb5_mk_req(*context, auth_context, AP_OPTS_MUTUAL_REQUIRED, |
|
"host", remotehost, NULL, ccache, &ap); |
|
if (problem) { |
|
debug("Kerberos v5: krb5_mk_req failed: %s", |
|
krb5_get_err_text(*context, problem)); |
|
ret = 0; |
|
goto out; |
|
} |
|
|
|
packet_start(SSH_CMSG_AUTH_KERBEROS); |
|
packet_put_string((char *) ap.data, ap.length); |
|
packet_send(); |
|
packet_write_wait(); |
|
|
|
xfree(ap.data); |
|
ap.length = 0; |
|
|
|
type = packet_read(&payload_len); |
|
switch (type) { |
|
case SSH_SMSG_FAILURE: |
|
/* Should really be SSH_SMSG_AUTH_KERBEROS_FAILURE */ |
|
debug("Kerberos v5 authentication failed."); |
|
ret = 0; |
|
break; |
|
|
|
case SSH_SMSG_AUTH_KERBEROS_RESPONSE: |
|
/* SSH_SMSG_AUTH_KERBEROS_SUCCESS */ |
|
debug("Kerberos v5 authentication accepted."); |
|
|
|
/* Get server's response. */ |
|
ap.data = packet_get_string((unsigned int *) &ap.length); |
|
|
|
packet_integrity_check(payload_len, 4 + ap.length, type); |
|
/* XXX je to dobre? */ |
|
|
|
problem = krb5_rd_rep(*context, *auth_context, &ap, &reply); |
|
if (problem) { |
|
ret = 0; |
|
} |
|
ret = 1; |
|
break; |
|
|
|
default: |
|
packet_disconnect("Protocol error on Kerberos v5 response: %d", |
|
type); |
|
ret = 0; |
|
break; |
|
|
|
} |
|
|
|
out: |
|
if (ccache != NULL) |
|
krb5_cc_close(*context, ccache); |
|
if (reply != NULL) |
|
krb5_free_ap_rep_enc_part(*context, reply); |
|
if (ap.length > 0) |
|
krb5_data_free(&ap); |
|
|
|
return (ret); |
|
} |
|
|
|
static void |
|
send_krb5_tgt(krb5_context context, krb5_auth_context auth_context) |
|
{ |
|
int fd, type, payload_len; |
|
krb5_error_code problem; |
|
krb5_data outbuf; |
|
krb5_ccache ccache = NULL; |
|
krb5_creds creds; |
|
krb5_kdc_flags flags; |
|
const char *remotehost; |
|
|
|
memset(&creds, 0, sizeof(creds)); |
|
memset(&outbuf, 0, sizeof(outbuf)); |
|
|
|
fd = packet_get_connection_in(); |
|
|
|
problem = krb5_auth_con_setaddrs_from_fd(context, auth_context, &fd); |
|
if (problem) |
|
goto out; |
|
|
|
problem = krb5_cc_default(context, &ccache); |
|
if (problem) |
|
goto out; |
|
|
|
problem = krb5_cc_get_principal(context, ccache, &creds.client); |
|
if (problem) |
|
goto out; |
|
|
|
problem = krb5_build_principal(context, &creds.server, |
|
strlen(creds.client->realm), creds.client->realm, |
|
"krbtgt", creds.client->realm, NULL); |
|
if (problem) |
|
goto out; |
|
|
|
creds.times.endtime = 0; |
|
|
|
flags.i = 0; |
|
flags.b.forwarded = 1; |
|
flags.b.forwardable = krb5_config_get_bool(context, NULL, |
|
"libdefaults", "forwardable", NULL); |
|
|
|
remotehost = get_canonical_hostname(1); |
|
|
|
problem = krb5_get_forwarded_creds(context, auth_context, |
|
ccache, flags.i, remotehost, &creds, &outbuf); |
|
if (problem) |
|
goto out; |
|
|
|
packet_start(SSH_CMSG_HAVE_KERBEROS_TGT); |
|
packet_put_string((char *)outbuf.data, outbuf.length); |
|
packet_send(); |
|
packet_write_wait(); |
|
|
|
type = packet_read(&payload_len); |
|
|
|
if (type == SSH_SMSG_SUCCESS) { |
|
char *pname; |
|
|
|
krb5_unparse_name(context, creds.client, &pname); |
|
debug("Kerberos v5 TGT forwarded (%s).", pname); |
|
xfree(pname); |
|
} else |
|
debug("Kerberos v5 TGT forwarding failed."); |
|
|
|
return; |
|
|
|
out: |
|
if (problem) |
|
debug("Kerberos v5 TGT forwarding failed: %s", |
|
krb5_get_err_text(context, problem)); |
|
if (creds.client) |
|
krb5_free_principal(context, creds.client); |
|
if (creds.server) |
|
krb5_free_principal(context, creds.server); |
|
if (ccache) |
|
krb5_cc_close(context, ccache); |
|
if (outbuf.data) |
|
xfree(outbuf.data); |
|
} |
|
#endif /* KRB5 */ |
|
|
#ifdef AFS |
#ifdef AFS |
int |
static void |
send_kerberos_tgt(void) |
send_krb4_tgt(void) |
{ |
{ |
CREDENTIALS *creds; |
CREDENTIALS *creds; |
char pname[ANAME_SZ], pinst[INST_SZ], prealm[REALM_SZ]; |
|
int r, type, plen; |
|
char buffer[8192]; |
|
struct stat st; |
struct stat st; |
|
char buffer[4096], pname[ANAME_SZ], pinst[INST_SZ], prealm[REALM_SZ]; |
|
int problem, type, len; |
|
|
/* Don't do anything if we don't have any tickets. */ |
/* Don't do anything if we don't have any tickets. */ |
if (stat(tkt_string(), &st) < 0) |
if (stat(tkt_string(), &st) < 0) |
return 0; |
return; |
|
|
creds = xmalloc(sizeof(*creds)); |
creds = xmalloc(sizeof(*creds)); |
|
|
if ((r = krb_get_tf_fullname(TKT_FILE, pname, pinst, prealm)) != KSUCCESS) { |
problem = krb_get_tf_fullname(TKT_FILE, pname, pinst, prealm); |
debug("Kerberos V4 tf_fullname failed: %s", krb_err_txt[r]); |
if (problem) |
return 0; |
goto out; |
} |
|
if ((r = krb_get_cred("krbtgt", prealm, prealm, creds)) != GC_OK) { |
problem = krb_get_cred("krbtgt", prealm, prealm, creds); |
debug("Kerberos V4 get_cred failed: %s", krb_err_txt[r]); |
if (problem) |
return 0; |
goto out; |
} |
|
if (time(0) > krb_life_to_time(creds->issue_date, creds->lifetime)) { |
if (time(0) > krb_life_to_time(creds->issue_date, creds->lifetime)) { |
debug("Kerberos V4 ticket expired: %s", TKT_FILE); |
problem = RD_AP_EXP; |
return 0; |
goto out; |
} |
} |
creds_to_radix(creds, (u_char *)buffer, sizeof buffer); |
creds_to_radix(creds, (u_char *)buffer, sizeof(buffer)); |
xfree(creds); |
|
|
|
packet_start(SSH_CMSG_HAVE_KERBEROS_TGT); |
packet_start(SSH_CMSG_HAVE_KERBEROS_TGT); |
packet_put_string(buffer, strlen(buffer)); |
packet_put_cstring(buffer); |
packet_send(); |
packet_send(); |
packet_write_wait(); |
packet_write_wait(); |
|
|
type = packet_read(&plen); |
type = packet_read(&len); |
|
|
if (type == SSH_SMSG_FAILURE) |
if (type == SSH_SMSG_SUCCESS) |
debug("Kerberos TGT for realm %s rejected.", prealm); |
debug("Kerberos v4 TGT forwarded (%s%s%s@%s).", |
else if (type != SSH_SMSG_SUCCESS) |
creds->pname, creds->pinst[0] ? "." : "", |
packet_disconnect("Protocol error on Kerberos TGT response: %d", type); |
creds->pinst, creds->realm); |
|
else |
return 1; |
debug("Kerberos v4 TGT rejected."); |
|
|
|
xfree(creds); |
|
return; |
|
|
|
out: |
|
debug("Kerberos v4 TGT passing failed: %s", krb_err_txt[problem]); |
|
xfree(creds); |
} |
} |
|
|
void |
static void |
send_afs_tokens(void) |
send_afs_tokens(void) |
{ |
{ |
CREDENTIALS creds; |
CREDENTIALS creds; |
struct ViceIoctl parms; |
struct ViceIoctl parms; |
struct ClearToken ct; |
struct ClearToken ct; |
int i, type, len, plen; |
int i, type, len; |
char buf[2048], *p, *server_cell; |
char buf[2048], *p, *server_cell; |
char buffer[8192]; |
char buffer[8192]; |
|
|
/* Move over ktc_GetToken, here's something leaner. */ |
/* Move over ktc_GetToken, here's something leaner. */ |
for (i = 0; i < 100; i++) { /* just in case */ |
for (i = 0; i < 100; i++) { /* just in case */ |
parms.in = (char *) &i; |
parms.in = (char *) &i; |
|
|
if (k_pioctl(0, VIOCGETTOK, &parms, 0) != 0) |
if (k_pioctl(0, VIOCGETTOK, &parms, 0) != 0) |
break; |
break; |
p = buf; |
p = buf; |
|
|
/* Get secret token. */ |
/* Get secret token. */ |
memcpy(&creds.ticket_st.length, p, sizeof(u_int)); |
memcpy(&creds.ticket_st.length, p, sizeof(u_int)); |
if (creds.ticket_st.length > MAX_KTXT_LEN) |
if (creds.ticket_st.length > MAX_KTXT_LEN) |
|
|
p += sizeof(u_int); |
p += sizeof(u_int); |
memcpy(creds.ticket_st.dat, p, creds.ticket_st.length); |
memcpy(creds.ticket_st.dat, p, creds.ticket_st.length); |
p += creds.ticket_st.length; |
p += creds.ticket_st.length; |
|
|
/* Get clear token. */ |
/* Get clear token. */ |
memcpy(&len, p, sizeof(len)); |
memcpy(&len, p, sizeof(len)); |
if (len != sizeof(struct ClearToken)) |
if (len != sizeof(struct ClearToken)) |
|
|
p += len; |
p += len; |
p += sizeof(len); /* primary flag */ |
p += sizeof(len); /* primary flag */ |
server_cell = p; |
server_cell = p; |
|
|
/* Flesh out our credentials. */ |
/* Flesh out our credentials. */ |
strlcpy(creds.service, "afs", sizeof creds.service); |
strlcpy(creds.service, "afs", sizeof(creds.service)); |
creds.instance[0] = '\0'; |
creds.instance[0] = '\0'; |
strlcpy(creds.realm, server_cell, REALM_SZ); |
strlcpy(creds.realm, server_cell, REALM_SZ); |
memcpy(creds.session, ct.HandShakeKey, DES_KEY_SZ); |
memcpy(creds.session, ct.HandShakeKey, DES_KEY_SZ); |
creds.issue_date = ct.BeginTimestamp; |
creds.issue_date = ct.BeginTimestamp; |
creds.lifetime = krb_time_to_life(creds.issue_date, ct.EndTimestamp); |
creds.lifetime = krb_time_to_life(creds.issue_date, |
|
ct.EndTimestamp); |
creds.kvno = ct.AuthHandle; |
creds.kvno = ct.AuthHandle; |
snprintf(creds.pname, sizeof(creds.pname), "AFS ID %d", ct.ViceId); |
snprintf(creds.pname, sizeof(creds.pname), "AFS ID %d", ct.ViceId); |
creds.pinst[0] = '\0'; |
creds.pinst[0] = '\0'; |
|
|
/* Encode token, ship it off. */ |
/* Encode token, ship it off. */ |
if (creds_to_radix(&creds, (u_char *) buffer, sizeof buffer) <= 0) |
if (creds_to_radix(&creds, (u_char *)buffer, |
|
sizeof(buffer)) <= 0) |
break; |
break; |
packet_start(SSH_CMSG_HAVE_AFS_TOKEN); |
packet_start(SSH_CMSG_HAVE_AFS_TOKEN); |
packet_put_string(buffer, strlen(buffer)); |
packet_put_cstring(buffer); |
packet_send(); |
packet_send(); |
packet_write_wait(); |
packet_write_wait(); |
|
|
/* Roger, Roger. Clearance, Clarence. What's your vector, |
/* Roger, Roger. Clearance, Clarence. What's your vector, |
Victor? */ |
Victor? */ |
type = packet_read(&plen); |
type = packet_read(&len); |
|
|
if (type == SSH_SMSG_FAILURE) |
if (type == SSH_SMSG_FAILURE) |
debug("AFS token for cell %s rejected.", server_cell); |
debug("AFS token for cell %s rejected.", server_cell); |
else if (type != SSH_SMSG_SUCCESS) |
else if (type != SSH_SMSG_SUCCESS) |
|
|
* Tries to authenticate with any string-based challenge/response system. |
* Tries to authenticate with any string-based challenge/response system. |
* Note that the client code is not tied to s/key or TIS. |
* Note that the client code is not tied to s/key or TIS. |
*/ |
*/ |
int |
static int |
try_challenge_reponse_authentication(void) |
try_challenge_response_authentication(void) |
{ |
{ |
int type, i; |
int type, i; |
int payload_len; |
int payload_len; |
u_int clen; |
u_int clen; |
char prompt[1024]; |
char prompt[1024]; |
char *challenge, *response; |
char *challenge, *response; |
|
|
debug("Doing challenge reponse authentication."); |
debug("Doing challenge reponse authentication."); |
|
|
for (i = 0; i < options.number_of_password_prompts; i++) { |
for (i = 0; i < options.number_of_password_prompts; i++) { |
/* request a challenge */ |
/* request a challenge */ |
packet_start(SSH_CMSG_AUTH_TIS); |
packet_start(SSH_CMSG_AUTH_TIS); |
|
|
/* |
/* |
* Tries to authenticate with plain passwd authentication. |
* Tries to authenticate with plain passwd authentication. |
*/ |
*/ |
int |
static int |
try_password_authentication(char *prompt) |
try_password_authentication(char *prompt) |
{ |
{ |
int type, i, payload_len; |
int type, i, payload_len; |
|
|
SSH_SMSG_PUBLIC_KEY); |
SSH_SMSG_PUBLIC_KEY); |
k.type = KEY_RSA1; |
k.type = KEY_RSA1; |
k.rsa = host_key; |
k.rsa = host_key; |
check_host_key(host, hostaddr, &k, |
if (verify_host_key(host, hostaddr, &k) == -1) |
options.user_hostfile, options.system_hostfile); |
fatal("host_key verification failed"); |
|
|
client_flags = SSH_PROTOFLAG_SCREEN_NUMBER | SSH_PROTOFLAG_HOST_IN_FWD_OPEN; |
client_flags = SSH_PROTOFLAG_SCREEN_NUMBER | SSH_PROTOFLAG_HOST_IN_FWD_OPEN; |
|
|
|
|
ssh_userauth1(const char *local_user, const char *server_user, char *host, |
ssh_userauth1(const char *local_user, const char *server_user, char *host, |
Key **keys, int nkeys) |
Key **keys, int nkeys) |
{ |
{ |
|
#ifdef KRB5 |
|
krb5_context context = NULL; |
|
krb5_auth_context auth_context = NULL; |
|
#endif |
int i, type; |
int i, type; |
int payload_len; |
int payload_len; |
|
|
if (supported_authentications == 0) |
if (supported_authentications == 0) |
fatal("ssh_userauth1: server supports no auth methods"); |
fatal("ssh_userauth1: server supports no auth methods"); |
|
|
/* Send the name of the user to log in as on the server. */ |
/* Send the name of the user to log in as on the server. */ |
packet_start(SSH_CMSG_USER); |
packet_start(SSH_CMSG_USER); |
packet_put_string(server_user, strlen(server_user)); |
packet_put_cstring(server_user); |
packet_send(); |
packet_send(); |
packet_write_wait(); |
packet_write_wait(); |
|
|
|
|
|
|
/* check whether the connection was accepted without authentication. */ |
/* check whether the connection was accepted without authentication. */ |
if (type == SSH_SMSG_SUCCESS) |
if (type == SSH_SMSG_SUCCESS) |
return; |
goto success; |
if (type != SSH_SMSG_FAILURE) |
if (type != SSH_SMSG_FAILURE) |
packet_disconnect("Protocol error: got %d in response to SSH_CMSG_USER", |
packet_disconnect("Protocol error: got %d in response to SSH_CMSG_USER", type); |
type); |
|
|
#ifdef KRB5 |
#ifdef AFS |
if ((supported_authentications & (1 << SSH_AUTH_KERBEROS)) && |
/* Try Kerberos tgt passing if the server supports it. */ |
options.kerberos_authentication) { |
if ((supported_authentications & (1 << SSH_PASS_KERBEROS_TGT)) && |
debug("Trying Kerberos v5 authentication."); |
options.kerberos_tgt_passing) { |
|
if (options.cipher == SSH_CIPHER_NONE) |
if (try_krb5_authentication(&context, &auth_context)) { |
log("WARNING: Encryption is disabled! Ticket will be transmitted in the clear!"); |
type = packet_read(&payload_len); |
(void) send_kerberos_tgt(); |
if (type == SSH_SMSG_SUCCESS) |
|
goto success; |
|
if (type != SSH_SMSG_FAILURE) |
|
packet_disconnect("Protocol error: got %d in response to Kerberos v5 auth", type); |
|
} |
} |
} |
/* Try AFS token passing if the server supports it. */ |
#endif /* KRB5 */ |
if ((supported_authentications & (1 << SSH_PASS_AFS_TOKEN)) && |
|
options.afs_token_passing && k_hasafs()) { |
|
if (options.cipher == SSH_CIPHER_NONE) |
|
log("WARNING: Encryption is disabled! Token will be transmitted in the clear!"); |
|
send_afs_tokens(); |
|
} |
|
#endif /* AFS */ |
|
|
|
#ifdef KRB4 |
#ifdef KRB4 |
if ((supported_authentications & (1 << SSH_AUTH_KERBEROS)) && |
if ((supported_authentications & (1 << SSH_AUTH_KERBEROS)) && |
options.kerberos_authentication) { |
options.kerberos_authentication) { |
debug("Trying Kerberos authentication."); |
debug("Trying Kerberos v4 authentication."); |
if (try_kerberos_authentication()) { |
|
/* The server should respond with success or failure. */ |
if (try_krb4_authentication()) { |
type = packet_read(&payload_len); |
type = packet_read(&payload_len); |
if (type == SSH_SMSG_SUCCESS) |
if (type == SSH_SMSG_SUCCESS) |
return; |
goto success; |
if (type != SSH_SMSG_FAILURE) |
if (type != SSH_SMSG_FAILURE) |
packet_disconnect("Protocol error: got %d in response to Kerberos auth", type); |
packet_disconnect("Protocol error: got %d in response to Kerberos v4 auth", type); |
} |
} |
} |
} |
#endif /* KRB4 */ |
#endif /* KRB4 */ |
|
|
/* |
/* |
* Use rhosts authentication if running in privileged socket and we |
* Use rhosts authentication if running in privileged socket and we |
* do not wish to remain anonymous. |
* do not wish to remain anonymous. |
|
|
options.rhosts_authentication) { |
options.rhosts_authentication) { |
debug("Trying rhosts authentication."); |
debug("Trying rhosts authentication."); |
packet_start(SSH_CMSG_AUTH_RHOSTS); |
packet_start(SSH_CMSG_AUTH_RHOSTS); |
packet_put_string(local_user, strlen(local_user)); |
packet_put_cstring(local_user); |
packet_send(); |
packet_send(); |
packet_write_wait(); |
packet_write_wait(); |
|
|
/* The server should respond with success or failure. */ |
/* The server should respond with success or failure. */ |
type = packet_read(&payload_len); |
type = packet_read(&payload_len); |
if (type == SSH_SMSG_SUCCESS) |
if (type == SSH_SMSG_SUCCESS) |
return; |
goto success; |
if (type != SSH_SMSG_FAILURE) |
if (type != SSH_SMSG_FAILURE) |
packet_disconnect("Protocol error: got %d in response to rhosts auth", |
packet_disconnect("Protocol error: got %d in response to rhosts auth", |
type); |
type); |
|
|
for (i = 0; i < nkeys; i++) { |
for (i = 0; i < nkeys; i++) { |
if (keys[i] != NULL && keys[i]->type == KEY_RSA1 && |
if (keys[i] != NULL && keys[i]->type == KEY_RSA1 && |
try_rhosts_rsa_authentication(local_user, keys[i])) |
try_rhosts_rsa_authentication(local_user, keys[i])) |
return; |
goto success; |
} |
} |
} |
} |
/* Try RSA authentication if the server supports it. */ |
/* Try RSA authentication if the server supports it. */ |
|
|
* it, whereas identity files may require passphrases. |
* it, whereas identity files may require passphrases. |
*/ |
*/ |
if (try_agent_authentication()) |
if (try_agent_authentication()) |
return; |
goto success; |
|
|
/* Try RSA authentication for each identity. */ |
/* Try RSA authentication for each identity. */ |
for (i = 0; i < options.num_identity_files; i++) |
for (i = 0; i < options.num_identity_files; i++) |
if (options.identity_keys[i] != NULL && |
if (options.identity_keys[i] != NULL && |
options.identity_keys[i]->type == KEY_RSA1 && |
options.identity_keys[i]->type == KEY_RSA1 && |
try_rsa_authentication(options.identity_files[i])) |
try_rsa_authentication(i)) |
return; |
goto success; |
} |
} |
/* Try challenge response authentication if the server supports it. */ |
/* Try challenge response authentication if the server supports it. */ |
if ((supported_authentications & (1 << SSH_AUTH_TIS)) && |
if ((supported_authentications & (1 << SSH_AUTH_TIS)) && |
options.challenge_reponse_authentication && !options.batch_mode) { |
options.challenge_response_authentication && !options.batch_mode) { |
if (try_challenge_reponse_authentication()) |
if (try_challenge_response_authentication()) |
return; |
goto success; |
} |
} |
/* Try password authentication if the server supports it. */ |
/* Try password authentication if the server supports it. */ |
if ((supported_authentications & (1 << SSH_AUTH_PASSWORD)) && |
if ((supported_authentications & (1 << SSH_AUTH_PASSWORD)) && |
|
|
snprintf(prompt, sizeof(prompt), "%.30s@%.128s's password: ", |
snprintf(prompt, sizeof(prompt), "%.30s@%.128s's password: ", |
server_user, host); |
server_user, host); |
if (try_password_authentication(prompt)) |
if (try_password_authentication(prompt)) |
return; |
goto success; |
} |
} |
/* All authentication methods have failed. Exit with an error message. */ |
/* All authentication methods have failed. Exit with an error message. */ |
fatal("Permission denied."); |
fatal("Permission denied."); |
/* NOTREACHED */ |
/* NOTREACHED */ |
|
|
|
success: |
|
#ifdef KRB5 |
|
/* Try Kerberos v5 TGT passing. */ |
|
if ((supported_authentications & (1 << SSH_PASS_KERBEROS_TGT)) && |
|
options.kerberos_tgt_passing && context && auth_context) { |
|
if (options.cipher == SSH_CIPHER_NONE) |
|
log("WARNING: Encryption is disabled! Ticket will be transmitted in the clear!"); |
|
send_krb5_tgt(context, auth_context); |
|
} |
|
if (auth_context) |
|
krb5_auth_con_free(context, auth_context); |
|
if (context) |
|
krb5_free_context(context); |
|
#endif |
|
|
|
#ifdef AFS |
|
/* Try Kerberos v4 TGT passing if the server supports it. */ |
|
if ((supported_authentications & (1 << SSH_PASS_KERBEROS_TGT)) && |
|
options.kerberos_tgt_passing) { |
|
if (options.cipher == SSH_CIPHER_NONE) |
|
log("WARNING: Encryption is disabled! Ticket will be transmitted in the clear!"); |
|
send_krb4_tgt(); |
|
} |
|
/* Try AFS token passing if the server supports it. */ |
|
if ((supported_authentications & (1 << SSH_PASS_AFS_TOKEN)) && |
|
options.afs_token_passing && k_hasafs()) { |
|
if (options.cipher == SSH_CIPHER_NONE) |
|
log("WARNING: Encryption is disabled! Token will be transmitted in the clear!"); |
|
send_afs_tokens(); |
|
} |
|
#endif /* AFS */ |
|
|
|
return; /* need statement after label */ |
} |
} |