+/* $OpenBSD: sshconnect2.c,v 1.179 2010/01/13 01:20:20 dtucker Exp $ */
/*
* Copyright (c) 2000 Markus Friedl. All rights reserved.
+ * Copyright (c) 2008 Damien Miller. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
*/
#include "includes.h"
-RCSID("$OpenBSD: sshconnect2.c,v 1.119 2003/05/15 00:28:28 markus Exp $");
-#ifdef KRB5
-#include <krb5.h>
-#ifndef HEIMDAL
-#define krb5_get_err_text(context,code) error_message(code)
-#endif /* !HEIMDAL */
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/wait.h>
+#include <sys/stat.h>
+
+#include <errno.h>
+#include <fcntl.h>
+#include <netdb.h>
+#include <pwd.h>
+#include <signal.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+#if defined(HAVE_STRNVIS) && defined(HAVE_VIS_H)
+#include <vis.h>
#endif
#include "openbsd-compat/sys-queue.h"
+#include "xmalloc.h"
#include "ssh.h"
#include "ssh2.h"
-#include "xmalloc.h"
#include "buffer.h"
#include "packet.h"
#include "compat.h"
-#include "bufaux.h"
#include "cipher.h"
+#include "key.h"
#include "kex.h"
#include "myproposal.h"
#include "sshconnect.h"
#include "authfd.h"
#include "log.h"
#include "readconf.h"
-#include "readpass.h"
+#include "misc.h"
#include "match.h"
#include "dispatch.h"
#include "canohost.h"
#include "msg.h"
#include "pathnames.h"
+#include "uidswap.h"
+#include "schnorr.h"
+#include "jpake.h"
+
+#ifdef GSSAPI
+#include "ssh-gss.h"
+#endif
/* import */
extern char *client_version_string;
*/
u_char *session_id2 = NULL;
-int session_id2_len = 0;
+u_int session_id2_len = 0;
char *xxx_host;
struct sockaddr *xxx_hostaddr;
compat_cipher_proposal(myproposal[PROPOSAL_ENC_ALGS_STOC]);
if (options.compression) {
myproposal[PROPOSAL_COMP_ALGS_CTOS] =
- myproposal[PROPOSAL_COMP_ALGS_STOC] = "zlib,none";
+ myproposal[PROPOSAL_COMP_ALGS_STOC] = "zlib@openssh.com,zlib,none";
} else {
myproposal[PROPOSAL_COMP_ALGS_CTOS] =
- myproposal[PROPOSAL_COMP_ALGS_STOC] = "none,zlib";
+ myproposal[PROPOSAL_COMP_ALGS_STOC] = "none,zlib@openssh.com,zlib";
}
if (options.macs != NULL) {
myproposal[PROPOSAL_MAC_ALGS_CTOS] =
options.hostkeyalgorithms;
if (options.rekey_limit)
- packet_set_rekey_limit(options.rekey_limit);
+ packet_set_rekey_limit((u_int32_t)options.rekey_limit);
/* start key exchange */
kex = kex_setup(myproposal);
kex->kex[KEX_DH_GRP1_SHA1] = kexdh_client;
+ kex->kex[KEX_DH_GRP14_SHA1] = kexdh_client;
kex->kex[KEX_DH_GEX_SHA1] = kexgex_client;
+ kex->kex[KEX_DH_GEX_SHA256] = kexgex_client;
kex->client_version_string=client_version_string;
kex->server_version_string=server_version_string;
kex->verify_host_key=&verify_host_key_callback;
dispatch_run(DISPATCH_BLOCK, &kex->done, kex);
+ if (options.use_roaming && !kex->roaming) {
+ debug("Roaming not allowed by server");
+ options.use_roaming = 0;
+ }
+
session_id2 = kex->session_id;
session_id2_len = kex->session_id_len;
Sensitive *sensitive;
/* kbd-interactive */
int info_req_seen;
+ /* generic */
+ void *methoddata;
};
struct Authmethod {
char *name; /* string to compare against server's list */
int (*userauth)(Authctxt *authctxt);
+ void (*cleanup)(Authctxt *authctxt);
int *enabled; /* flag in option struct that enables method */
int *batch_flag; /* flag in option struct that disables method */
};
void input_userauth_success(int, u_int32_t, void *);
+void input_userauth_success_unexpected(int, u_int32_t, void *);
void input_userauth_failure(int, u_int32_t, void *);
void input_userauth_banner(int, u_int32_t, void *);
void input_userauth_error(int, u_int32_t, void *);
void input_userauth_info_req(int, u_int32_t, void *);
void input_userauth_pk_ok(int, u_int32_t, void *);
void input_userauth_passwd_changereq(int, u_int32_t, void *);
+void input_userauth_jpake_server_step1(int, u_int32_t, void *);
+void input_userauth_jpake_server_step2(int, u_int32_t, void *);
+void input_userauth_jpake_server_confirm(int, u_int32_t, void *);
int userauth_none(Authctxt *);
int userauth_pubkey(Authctxt *);
int userauth_passwd(Authctxt *);
int userauth_kbdint(Authctxt *);
int userauth_hostbased(Authctxt *);
-int userauth_kerberos(Authctxt *);
+int userauth_jpake(Authctxt *);
+
+void userauth_jpake_cleanup(Authctxt *);
+
+#ifdef GSSAPI
+int userauth_gssapi(Authctxt *authctxt);
+void input_gssapi_response(int type, u_int32_t, void *);
+void input_gssapi_token(int type, u_int32_t, void *);
+void input_gssapi_hash(int type, u_int32_t, void *);
+void input_gssapi_error(int, u_int32_t, void *);
+void input_gssapi_errtok(int, u_int32_t, void *);
+#endif
void userauth(Authctxt *, char *);
static char *authmethods_get(void);
Authmethod authmethods[] = {
+#ifdef GSSAPI
+ {"gssapi-with-mic",
+ userauth_gssapi,
+ NULL,
+ &options.gss_authentication,
+ NULL},
+#endif
{"hostbased",
userauth_hostbased,
+ NULL,
&options.hostbased_authentication,
NULL},
-#if KRB5
- {"kerberos-2@ssh.com",
- userauth_kerberos,
- &options.kerberos_authentication,
- NULL},
-#endif
{"publickey",
userauth_pubkey,
+ NULL,
&options.pubkey_authentication,
NULL},
+#ifdef JPAKE
+ {"jpake-01@openssh.com",
+ userauth_jpake,
+ userauth_jpake_cleanup,
+ &options.zero_knowledge_password_authentication,
+ &options.batch_mode},
+#endif
{"keyboard-interactive",
userauth_kbdint,
+ NULL,
&options.kbd_interactive_authentication,
&options.batch_mode},
{"password",
userauth_passwd,
+ NULL,
&options.password_authentication,
&options.batch_mode},
{"none",
userauth_none,
NULL,
+ NULL,
NULL},
- {NULL, NULL, NULL, NULL}
+ {NULL, NULL, NULL, NULL, NULL}
};
void
authctxt.success = 0;
authctxt.method = authmethod_lookup("none");
authctxt.authlist = NULL;
+ authctxt.methoddata = NULL;
authctxt.sensitive = sensitive;
authctxt.info_req_seen = 0;
if (authctxt.method == NULL)
void
userauth(Authctxt *authctxt, char *authlist)
{
+ if (authctxt->method != NULL && authctxt->method->cleanup != NULL)
+ authctxt->method->cleanup(authctxt);
+
+ if (authctxt->methoddata) {
+ xfree(authctxt->methoddata);
+ authctxt->methoddata = NULL;
+ }
if (authlist == NULL) {
authlist = authctxt->authlist;
} else {
}
}
+/* ARGSUSED */
void
input_userauth_error(int type, u_int32_t seq, void *ctxt)
{
fatal("input_userauth_error: bad message during authentication: "
- "type %d", type);
+ "type %d", type);
}
+/* ARGSUSED */
void
input_userauth_banner(int type, u_int32_t seq, void *ctxt)
{
- char *msg, *lang;
+ char *msg, *raw, *lang;
+ u_int len;
+
debug3("input_userauth_banner");
- msg = packet_get_string(NULL);
+ raw = packet_get_string(&len);
lang = packet_get_string(NULL);
- fprintf(stderr, "%s", msg);
- xfree(msg);
+ if (len > 0 && options.log_level >= SYSLOG_LEVEL_INFO) {
+ if (len > 65536)
+ len = 65536;
+ msg = xmalloc(len * 4 + 1); /* max expansion from strnvis() */
+ strnvis(msg, raw, len * 4 + 1, VIS_SAFE|VIS_OCTAL|VIS_NOSLASH);
+ fprintf(stderr, "%s", msg);
+ xfree(msg);
+ }
+ xfree(raw);
xfree(lang);
}
+/* ARGSUSED */
void
input_userauth_success(int type, u_int32_t seq, void *ctxt)
{
Authctxt *authctxt = ctxt;
+
if (authctxt == NULL)
fatal("input_userauth_success: no authentication context");
- if (authctxt->authlist)
+ if (authctxt->authlist) {
xfree(authctxt->authlist);
+ authctxt->authlist = NULL;
+ }
+ if (authctxt->method != NULL && authctxt->method->cleanup != NULL)
+ authctxt->method->cleanup(authctxt);
+ if (authctxt->methoddata) {
+ xfree(authctxt->methoddata);
+ authctxt->methoddata = NULL;
+ }
authctxt->success = 1; /* break out */
}
+void
+input_userauth_success_unexpected(int type, u_int32_t seq, void *ctxt)
+{
+ Authctxt *authctxt = ctxt;
+
+ if (authctxt == NULL)
+ fatal("%s: no authentication context", __func__);
+
+ fatal("Unexpected authentication success during %s.",
+ authctxt->method->name);
+}
+
+/* ARGSUSED */
void
input_userauth_failure(int type, u_int32_t seq, void *ctxt)
{
userauth(authctxt, authlist);
}
+
+/* ARGSUSED */
void
input_userauth_pk_ok(int type, u_int32_t seq, void *ctxt)
{
debug2("input_userauth_pk_ok: fp %s", fp);
xfree(fp);
- TAILQ_FOREACH(id, &authctxt->keys, next) {
+ /*
+ * search keys in the reverse order, because last candidate has been
+ * moved to the end of the queue. this also avoids confusion by
+ * duplicate keys
+ */
+ TAILQ_FOREACH_REVERSE(id, &authctxt->keys, idlist, next) {
if (key_equal(key, id->key)) {
sent = sign_and_send_pubkey(authctxt, id);
break;
userauth(authctxt, NULL);
}
+#ifdef GSSAPI
+int
+userauth_gssapi(Authctxt *authctxt)
+{
+ Gssctxt *gssctxt = NULL;
+ static gss_OID_set gss_supported = NULL;
+ static u_int mech = 0;
+ OM_uint32 min;
+ int ok = 0;
+
+ /* Try one GSSAPI method at a time, rather than sending them all at
+ * once. */
+
+ if (gss_supported == NULL)
+ gss_indicate_mechs(&min, &gss_supported);
+
+ /* Check to see if the mechanism is usable before we offer it */
+ while (mech < gss_supported->count && !ok) {
+ /* My DER encoding requires length<128 */
+ if (gss_supported->elements[mech].length < 128 &&
+ ssh_gssapi_check_mechanism(&gssctxt,
+ &gss_supported->elements[mech], authctxt->host)) {
+ ok = 1; /* Mechanism works */
+ } else {
+ mech++;
+ }
+ }
+
+ if (!ok)
+ return 0;
+
+ authctxt->methoddata=(void *)gssctxt;
+
+ packet_start(SSH2_MSG_USERAUTH_REQUEST);
+ packet_put_cstring(authctxt->server_user);
+ packet_put_cstring(authctxt->service);
+ packet_put_cstring(authctxt->method->name);
+
+ packet_put_int(1);
+
+ packet_put_int((gss_supported->elements[mech].length) + 2);
+ packet_put_char(SSH_GSS_OIDTYPE);
+ packet_put_char(gss_supported->elements[mech].length);
+ packet_put_raw(gss_supported->elements[mech].elements,
+ gss_supported->elements[mech].length);
+
+ packet_send();
+
+ dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_RESPONSE, &input_gssapi_response);
+ dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_TOKEN, &input_gssapi_token);
+ dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_ERROR, &input_gssapi_error);
+ dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_ERRTOK, &input_gssapi_errtok);
+
+ mech++; /* Move along to next candidate */
+
+ return 1;
+}
+
+static OM_uint32
+process_gssapi_token(void *ctxt, gss_buffer_t recv_tok)
+{
+ Authctxt *authctxt = ctxt;
+ Gssctxt *gssctxt = authctxt->methoddata;
+ gss_buffer_desc send_tok = GSS_C_EMPTY_BUFFER;
+ gss_buffer_desc mic = GSS_C_EMPTY_BUFFER;
+ gss_buffer_desc gssbuf;
+ OM_uint32 status, ms, flags;
+ Buffer b;
+
+ status = ssh_gssapi_init_ctx(gssctxt, options.gss_deleg_creds,
+ recv_tok, &send_tok, &flags);
+
+ if (send_tok.length > 0) {
+ if (GSS_ERROR(status))
+ packet_start(SSH2_MSG_USERAUTH_GSSAPI_ERRTOK);
+ else
+ packet_start(SSH2_MSG_USERAUTH_GSSAPI_TOKEN);
+
+ packet_put_string(send_tok.value, send_tok.length);
+ packet_send();
+ gss_release_buffer(&ms, &send_tok);
+ }
+
+ if (status == GSS_S_COMPLETE) {
+ /* send either complete or MIC, depending on mechanism */
+ if (!(flags & GSS_C_INTEG_FLAG)) {
+ packet_start(SSH2_MSG_USERAUTH_GSSAPI_EXCHANGE_COMPLETE);
+ packet_send();
+ } else {
+ ssh_gssapi_buildmic(&b, authctxt->server_user,
+ authctxt->service, "gssapi-with-mic");
+
+ gssbuf.value = buffer_ptr(&b);
+ gssbuf.length = buffer_len(&b);
+
+ status = ssh_gssapi_sign(gssctxt, &gssbuf, &mic);
+
+ if (!GSS_ERROR(status)) {
+ packet_start(SSH2_MSG_USERAUTH_GSSAPI_MIC);
+ packet_put_string(mic.value, mic.length);
+
+ packet_send();
+ }
+
+ buffer_free(&b);
+ gss_release_buffer(&ms, &mic);
+ }
+ }
+
+ return status;
+}
+
+/* ARGSUSED */
+void
+input_gssapi_response(int type, u_int32_t plen, void *ctxt)
+{
+ Authctxt *authctxt = ctxt;
+ Gssctxt *gssctxt;
+ int oidlen;
+ char *oidv;
+
+ if (authctxt == NULL)
+ fatal("input_gssapi_response: no authentication context");
+ gssctxt = authctxt->methoddata;
+
+ /* Setup our OID */
+ oidv = packet_get_string(&oidlen);
+
+ if (oidlen <= 2 ||
+ oidv[0] != SSH_GSS_OIDTYPE ||
+ oidv[1] != oidlen - 2) {
+ xfree(oidv);
+ debug("Badly encoded mechanism OID received");
+ userauth(authctxt, NULL);
+ return;
+ }
+
+ if (!ssh_gssapi_check_oid(gssctxt, oidv + 2, oidlen - 2))
+ fatal("Server returned different OID than expected");
+
+ packet_check_eom();
+
+ xfree(oidv);
+
+ if (GSS_ERROR(process_gssapi_token(ctxt, GSS_C_NO_BUFFER))) {
+ /* Start again with next method on list */
+ debug("Trying to start again");
+ userauth(authctxt, NULL);
+ return;
+ }
+}
+
+/* ARGSUSED */
+void
+input_gssapi_token(int type, u_int32_t plen, void *ctxt)
+{
+ Authctxt *authctxt = ctxt;
+ gss_buffer_desc recv_tok;
+ OM_uint32 status;
+ u_int slen;
+
+ if (authctxt == NULL)
+ fatal("input_gssapi_response: no authentication context");
+
+ recv_tok.value = packet_get_string(&slen);
+ recv_tok.length = slen; /* safe typecast */
+
+ packet_check_eom();
+
+ status = process_gssapi_token(ctxt, &recv_tok);
+
+ xfree(recv_tok.value);
+
+ if (GSS_ERROR(status)) {
+ /* Start again with the next method in the list */
+ userauth(authctxt, NULL);
+ return;
+ }
+}
+
+/* ARGSUSED */
+void
+input_gssapi_errtok(int type, u_int32_t plen, void *ctxt)
+{
+ Authctxt *authctxt = ctxt;
+ Gssctxt *gssctxt;
+ gss_buffer_desc send_tok = GSS_C_EMPTY_BUFFER;
+ gss_buffer_desc recv_tok;
+ OM_uint32 status, ms;
+ u_int len;
+
+ if (authctxt == NULL)
+ fatal("input_gssapi_response: no authentication context");
+ gssctxt = authctxt->methoddata;
+
+ recv_tok.value = packet_get_string(&len);
+ recv_tok.length = len;
+
+ packet_check_eom();
+
+ /* Stick it into GSSAPI and see what it says */
+ status = ssh_gssapi_init_ctx(gssctxt, options.gss_deleg_creds,
+ &recv_tok, &send_tok, NULL);
+
+ xfree(recv_tok.value);
+ gss_release_buffer(&ms, &send_tok);
+
+ /* Server will be returning a failed packet after this one */
+}
+
+/* ARGSUSED */
+void
+input_gssapi_error(int type, u_int32_t plen, void *ctxt)
+{
+ OM_uint32 maj, min;
+ char *msg;
+ char *lang;
+
+ maj=packet_get_int();
+ min=packet_get_int();
+ msg=packet_get_string(NULL);
+ lang=packet_get_string(NULL);
+
+ packet_check_eom();
+
+ debug("Server GSSAPI Error:\n%s", msg);
+ xfree(msg);
+ xfree(lang);
+}
+#endif /* GSSAPI */
+
int
userauth_none(Authctxt *authctxt)
{
static int attempt = 0;
char prompt[150];
char *password;
+ const char *host = options.host_key_alias ? options.host_key_alias :
+ authctxt->host;
if (attempt++ >= options.number_of_password_prompts)
return 0;
error("Permission denied, please try again.");
snprintf(prompt, sizeof(prompt), "%.30s@%.128s's password: ",
- authctxt->server_user, authctxt->host);
+ authctxt->server_user, host);
password = read_passphrase(prompt, 0);
packet_start(SSH2_MSG_USERAUTH_REQUEST);
packet_put_cstring(authctxt->server_user);
return 1;
}
+
/*
* parse PASSWD_CHANGEREQ, prompt user and send SSH2_MSG_USERAUTH_REQUEST
*/
+/* ARGSUSED */
void
input_userauth_passwd_changereq(int type, u_int32_t seqnr, void *ctxt)
{
Authctxt *authctxt = ctxt;
char *info, *lang, *password = NULL, *retype = NULL;
char prompt[150];
+ const char *host = options.host_key_alias ? options.host_key_alias :
+ authctxt->host;
debug2("input_userauth_passwd_changereq");
packet_put_char(1); /* additional info */
snprintf(prompt, sizeof(prompt),
"Enter %.30s@%.128s's old password: ",
- authctxt->server_user, authctxt->host);
+ authctxt->server_user, host);
password = read_passphrase(prompt, 0);
packet_put_cstring(password);
memset(password, 0, strlen(password));
while (password == NULL) {
snprintf(prompt, sizeof(prompt),
"Enter %.30s@%.128s's new password: ",
- authctxt->server_user, authctxt->host);
+ authctxt->server_user, host);
password = read_passphrase(prompt, RP_ALLOW_EOF);
if (password == NULL) {
/* bail out */
}
snprintf(prompt, sizeof(prompt),
"Retype %.30s@%.128s's new password: ",
- authctxt->server_user, authctxt->host);
+ authctxt->server_user, host);
retype = read_passphrase(prompt, 0);
if (strcmp(password, retype) != 0) {
memset(password, 0, strlen(password));
&input_userauth_passwd_changereq);
}
+#ifdef JPAKE
+static char *
+pw_encrypt(const char *password, const char *crypt_scheme, const char *salt)
+{
+ /* OpenBSD crypt(3) handles all of these */
+ if (strcmp(crypt_scheme, "crypt") == 0 ||
+ strcmp(crypt_scheme, "bcrypt") == 0 ||
+ strcmp(crypt_scheme, "md5crypt") == 0 ||
+ strcmp(crypt_scheme, "crypt-extended") == 0)
+ return xstrdup(crypt(password, salt));
+ error("%s: unsupported password encryption scheme \"%.100s\"",
+ __func__, crypt_scheme);
+ return NULL;
+}
+
+static BIGNUM *
+jpake_password_to_secret(Authctxt *authctxt, const char *crypt_scheme,
+ const char *salt)
+{
+ char prompt[256], *password, *crypted;
+ u_char *secret;
+ u_int secret_len;
+ BIGNUM *ret;
+
+ snprintf(prompt, sizeof(prompt), "%.30s@%.128s's password (JPAKE): ",
+ authctxt->server_user, authctxt->host);
+ password = read_passphrase(prompt, 0);
+
+ if ((crypted = pw_encrypt(password, crypt_scheme, salt)) == NULL) {
+ logit("Disabling %s authentication", authctxt->method->name);
+ authctxt->method->enabled = NULL;
+ /* Continue with an empty password to fail gracefully */
+ crypted = xstrdup("");
+ }
+
+#ifdef JPAKE_DEBUG
+ debug3("%s: salt = %s", __func__, salt);
+ debug3("%s: scheme = %s", __func__, crypt_scheme);
+ debug3("%s: crypted = %s", __func__, crypted);
+#endif
+
+ if (hash_buffer(crypted, strlen(crypted), EVP_sha256(),
+ &secret, &secret_len) != 0)
+ fatal("%s: hash_buffer", __func__);
+
+ bzero(password, strlen(password));
+ bzero(crypted, strlen(crypted));
+ xfree(password);
+ xfree(crypted);
+
+ if ((ret = BN_bin2bn(secret, secret_len, NULL)) == NULL)
+ fatal("%s: BN_bin2bn (secret)", __func__);
+ bzero(secret, secret_len);
+ xfree(secret);
+
+ return ret;
+}
+
+/* ARGSUSED */
+void
+input_userauth_jpake_server_step1(int type, u_int32_t seq, void *ctxt)
+{
+ Authctxt *authctxt = ctxt;
+ struct jpake_ctx *pctx = authctxt->methoddata;
+ u_char *x3_proof, *x4_proof, *x2_s_proof;
+ u_int x3_proof_len, x4_proof_len, x2_s_proof_len;
+ char *crypt_scheme, *salt;
+
+ /* Disable this message */
+ dispatch_set(SSH2_MSG_USERAUTH_JPAKE_SERVER_STEP1, NULL);
+
+ if ((pctx->g_x3 = BN_new()) == NULL ||
+ (pctx->g_x4 = BN_new()) == NULL)
+ fatal("%s: BN_new", __func__);
+
+ /* Fetch step 1 values */
+ crypt_scheme = packet_get_string(NULL);
+ salt = packet_get_string(NULL);
+ pctx->server_id = packet_get_string(&pctx->server_id_len);
+ packet_get_bignum2(pctx->g_x3);
+ packet_get_bignum2(pctx->g_x4);
+ x3_proof = packet_get_string(&x3_proof_len);
+ x4_proof = packet_get_string(&x4_proof_len);
+ packet_check_eom();
+
+ JPAKE_DEBUG_CTX((pctx, "step 1 received in %s", __func__));
+
+ /* Obtain password and derive secret */
+ pctx->s = jpake_password_to_secret(authctxt, crypt_scheme, salt);
+ bzero(crypt_scheme, strlen(crypt_scheme));
+ bzero(salt, strlen(salt));
+ xfree(crypt_scheme);
+ xfree(salt);
+ JPAKE_DEBUG_BN((pctx->s, "%s: s = ", __func__));
+
+ /* Calculate step 2 values */
+ jpake_step2(pctx->grp, pctx->s, pctx->g_x1,
+ pctx->g_x3, pctx->g_x4, pctx->x2,
+ pctx->server_id, pctx->server_id_len,
+ pctx->client_id, pctx->client_id_len,
+ x3_proof, x3_proof_len,
+ x4_proof, x4_proof_len,
+ &pctx->a,
+ &x2_s_proof, &x2_s_proof_len);
+
+ bzero(x3_proof, x3_proof_len);
+ bzero(x4_proof, x4_proof_len);
+ xfree(x3_proof);
+ xfree(x4_proof);
+
+ JPAKE_DEBUG_CTX((pctx, "step 2 sending in %s", __func__));
+
+ /* Send values for step 2 */
+ packet_start(SSH2_MSG_USERAUTH_JPAKE_CLIENT_STEP2);
+ packet_put_bignum2(pctx->a);
+ packet_put_string(x2_s_proof, x2_s_proof_len);
+ packet_send();
+
+ bzero(x2_s_proof, x2_s_proof_len);
+ xfree(x2_s_proof);
+
+ /* Expect step 2 packet from peer */
+ dispatch_set(SSH2_MSG_USERAUTH_JPAKE_SERVER_STEP2,
+ input_userauth_jpake_server_step2);
+}
+
+/* ARGSUSED */
+void
+input_userauth_jpake_server_step2(int type, u_int32_t seq, void *ctxt)
+{
+ Authctxt *authctxt = ctxt;
+ struct jpake_ctx *pctx = authctxt->methoddata;
+ u_char *x4_s_proof;
+ u_int x4_s_proof_len;
+
+ /* Disable this message */
+ dispatch_set(SSH2_MSG_USERAUTH_JPAKE_SERVER_STEP2, NULL);
+
+ if ((pctx->b = BN_new()) == NULL)
+ fatal("%s: BN_new", __func__);
+
+ /* Fetch step 2 values */
+ packet_get_bignum2(pctx->b);
+ x4_s_proof = packet_get_string(&x4_s_proof_len);
+ packet_check_eom();
+
+ JPAKE_DEBUG_CTX((pctx, "step 2 received in %s", __func__));
+
+ /* Derive shared key and calculate confirmation hash */
+ jpake_key_confirm(pctx->grp, pctx->s, pctx->b,
+ pctx->x2, pctx->g_x1, pctx->g_x2, pctx->g_x3, pctx->g_x4,
+ pctx->client_id, pctx->client_id_len,
+ pctx->server_id, pctx->server_id_len,
+ session_id2, session_id2_len,
+ x4_s_proof, x4_s_proof_len,
+ &pctx->k,
+ &pctx->h_k_cid_sessid, &pctx->h_k_cid_sessid_len);
+
+ bzero(x4_s_proof, x4_s_proof_len);
+ xfree(x4_s_proof);
+
+ JPAKE_DEBUG_CTX((pctx, "confirm sending in %s", __func__));
+
+ /* Send key confirmation proof */
+ packet_start(SSH2_MSG_USERAUTH_JPAKE_CLIENT_CONFIRM);
+ packet_put_string(pctx->h_k_cid_sessid, pctx->h_k_cid_sessid_len);
+ packet_send();
+
+ /* Expect confirmation from peer */
+ dispatch_set(SSH2_MSG_USERAUTH_JPAKE_SERVER_CONFIRM,
+ input_userauth_jpake_server_confirm);
+}
+
+/* ARGSUSED */
+void
+input_userauth_jpake_server_confirm(int type, u_int32_t seq, void *ctxt)
+{
+ Authctxt *authctxt = ctxt;
+ struct jpake_ctx *pctx = authctxt->methoddata;
+
+ /* Disable this message */
+ dispatch_set(SSH2_MSG_USERAUTH_JPAKE_SERVER_CONFIRM, NULL);
+
+ pctx->h_k_sid_sessid = packet_get_string(&pctx->h_k_sid_sessid_len);
+ packet_check_eom();
+
+ JPAKE_DEBUG_CTX((pctx, "confirm received in %s", __func__));
+
+ /* Verify expected confirmation hash */
+ if (jpake_check_confirm(pctx->k,
+ pctx->server_id, pctx->server_id_len,
+ session_id2, session_id2_len,
+ pctx->h_k_sid_sessid, pctx->h_k_sid_sessid_len) == 1)
+ debug("%s: %s success", __func__, authctxt->method->name);
+ else {
+ debug("%s: confirmation mismatch", __func__);
+ /* XXX stash this so if auth succeeds then we can warn/kill */
+ }
+
+ userauth_jpake_cleanup(authctxt);
+}
+#endif /* JPAKE */
+
static int
identity_sign(Identity *id, u_char **sigp, u_int *lenp,
u_char *data, u_int datalen)
Buffer b;
u_char *blob, *signature;
u_int bloblen, slen;
- int skip = 0;
+ u_int skip = 0;
int ret = -1;
int have_sig = 1;
{
Key *private;
char prompt[300], *passphrase;
- int quit, i;
+ int perm_ok = 0, quit, i;
struct stat st;
if (stat(filename, &st) < 0) {
debug3("no such identity: %s", filename);
return NULL;
}
- private = key_load_private_type(KEY_UNSPEC, filename, "", NULL);
+ private = key_load_private_type(KEY_UNSPEC, filename, "", NULL, &perm_ok);
+ if (!perm_ok)
+ return NULL;
if (private == NULL) {
if (options.batch_mode)
return NULL;
for (i = 0; i < options.number_of_password_prompts; i++) {
passphrase = read_passphrase(prompt, 0);
if (strcmp(passphrase, "") != 0) {
- private = key_load_private_type(KEY_UNSPEC, filename,
- passphrase, NULL);
+ private = key_load_private_type(KEY_UNSPEC,
+ filename, passphrase, NULL, NULL);
quit = 0;
} else {
debug2("no passphrase given, try next key");
if (key && key->type == KEY_RSA1)
continue;
options.identity_keys[i] = NULL;
- id = xmalloc(sizeof(*id));
- memset(id, 0, sizeof(*id));
+ id = xcalloc(1, sizeof(*id));
id->key = key;
id->filename = xstrdup(options.identity_files[i]);
TAILQ_INSERT_TAIL(&files, id, next);
key = ssh_get_next_identity(ac, &comment, 2)) {
found = 0;
TAILQ_FOREACH(id, &files, next) {
- /* agent keys from the config file are preferred */
+ /* agent keys from the config file are preferred */
if (key_equal(key, id->key)) {
key_free(key);
xfree(comment);
break;
}
}
- if (!found) {
- id = xmalloc(sizeof(*id));
- memset(id, 0, sizeof(*id));
+ if (!found && !options.identities_only) {
+ id = xcalloc(1, sizeof(*id));
id->key = key;
id->filename = comment;
id->ac = ac;
while ((id = TAILQ_FIRST(&authctxt->keys))) {
if (id->tried++)
return (0);
+ /* move key to the end of the queue */
TAILQ_REMOVE(&authctxt->keys, id, next);
TAILQ_INSERT_TAIL(&authctxt->keys, id, next);
/*
debug2("ssh_keysign called");
if (stat(_PATH_SSH_KEY_SIGN, &st) < 0) {
- error("ssh_keysign: no installed: %s", strerror(errno));
+ error("ssh_keysign: not installed: %s", strerror(errno));
return -1;
}
if (fflush(stdout) != 0)
return -1;
}
if (pid == 0) {
- seteuid(getuid());
- setuid(getuid());
+ /* keep the socket on exec */
+ fcntl(packet_get_connection_in(), F_SETFD, 0);
+ permanently_drop_suid(getuid());
close(from[0]);
if (dup2(from[1], STDOUT_FILENO) < 0)
fatal("ssh_keysign: dup2: %s", strerror(errno));
buffer_init(&b);
buffer_put_int(&b, packet_get_connection_in()); /* send # of socket */
buffer_put_string(&b, data, datalen);
- ssh_msg_send(to[1], version, &b);
+ if (ssh_msg_send(to[1], version, &b) == -1)
+ fatal("ssh_keysign: couldn't send request");
if (ssh_msg_recv(from[0], &b) < 0) {
error("ssh_keysign: no reply");
- buffer_clear(&b);
+ buffer_free(&b);
return -1;
}
close(from[0]);
if (buffer_get_char(&b) != version) {
error("ssh_keysign: bad version");
- buffer_clear(&b);
+ buffer_free(&b);
return -1;
}
*sigp = buffer_get_string(&b, lenp);
- buffer_clear(&b);
+ buffer_free(&b);
return 0;
}
char *chost, *pkalg, *p;
const char *service;
u_int blen, slen;
- int ok, i, len, found = 0;
+ int ok, i, found = 0;
/* check for a useful key */
for (i = 0; i < sensitive->nkeys; i++) {
if (p == NULL) {
error("userauth_hostbased: cannot get local ipaddr/name");
key_free(private);
+ xfree(blob);
return 0;
}
- len = strlen(p) + 2;
- chost = xmalloc(len);
- strlcpy(chost, p, len);
- strlcat(chost, ".", len);
+ xasprintf(&chost, "%s.", p);
debug2("userauth_hostbased: chost %s", chost);
xfree(p);
error("key_sign failed");
xfree(chost);
xfree(pkalg);
+ xfree(blob);
return 0;
}
packet_start(SSH2_MSG_USERAUTH_REQUEST);
xfree(signature);
xfree(chost);
xfree(pkalg);
+ xfree(blob);
packet_send();
return 1;
}
-#if KRB5
-static int
-ssh_krb5_helper(krb5_data *ap, krb5_context *context)
+#ifdef JPAKE
+int
+userauth_jpake(Authctxt *authctxt)
{
- krb5_context xcontext = NULL; /* XXX share with ssh1 */
- krb5_auth_context xauth_context = NULL;
- krb5_auth_context *auth_context;
- krb5_error_code problem;
- const char *tkfile;
- struct stat buf;
- krb5_ccache ccache = NULL;
- const char *remotehost;
- int ret;
+ struct jpake_ctx *pctx;
+ u_char *x1_proof, *x2_proof;
+ u_int x1_proof_len, x2_proof_len;
+ static int attempt = 0; /* XXX share with userauth_password's? */
- memset(ap, 0, sizeof(*ap));
+ if (attempt++ >= options.number_of_password_prompts)
+ return 0;
+ if (attempt != 1)
+ error("Permission denied, please try again.");
- context = &xcontext;
- auth_context = &xauth_context;
+ if (authctxt->methoddata != NULL)
+ fatal("%s: authctxt->methoddata already set (%p)",
+ __func__, authctxt->methoddata);
- problem = krb5_init_context(context);
- if (problem) {
- debug("Kerberos v5: krb5_init_context failed");
- ret = 0;
- goto out;
- }
+ authctxt->methoddata = pctx = jpake_new();
+
+ /*
+ * Send request immediately, to get the protocol going while
+ * we do the initial computations.
+ */
+ packet_start(SSH2_MSG_USERAUTH_REQUEST);
+ packet_put_cstring(authctxt->server_user);
+ packet_put_cstring(authctxt->service);
+ packet_put_cstring(authctxt->method->name);
+ packet_send();
+ packet_write_wait();
- tkfile = krb5_cc_default_name(*context);
- if (strncmp(tkfile, "FILE:", 5) == 0)
- tkfile += 5;
+ jpake_step1(pctx->grp,
+ &pctx->client_id, &pctx->client_id_len,
+ &pctx->x1, &pctx->x2, &pctx->g_x1, &pctx->g_x2,
+ &x1_proof, &x1_proof_len,
+ &x2_proof, &x2_proof_len);
- if (stat(tkfile, &buf) == 0 && getuid() != buf.st_uid) {
- debug("Kerberos v5: could not get default ccache (permission denied).");
- ret = 0;
- goto out;
- }
+ JPAKE_DEBUG_CTX((pctx, "step 1 sending in %s", __func__));
- 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;
- }
+ packet_start(SSH2_MSG_USERAUTH_JPAKE_CLIENT_STEP1);
+ packet_put_string(pctx->client_id, pctx->client_id_len);
+ packet_put_bignum2(pctx->g_x1);
+ packet_put_bignum2(pctx->g_x2);
+ packet_put_string(x1_proof, x1_proof_len);
+ packet_put_string(x2_proof, x2_proof_len);
+ packet_send();
- remotehost = get_canonical_hostname(1);
+ bzero(x1_proof, x1_proof_len);
+ bzero(x2_proof, x2_proof_len);
+ xfree(x1_proof);
+ xfree(x2_proof);
- 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;
- }
- ret = 1;
+ /* Expect step 1 packet from peer */
+ dispatch_set(SSH2_MSG_USERAUTH_JPAKE_SERVER_STEP1,
+ input_userauth_jpake_server_step1);
+ dispatch_set(SSH2_MSG_USERAUTH_SUCCESS,
+ &input_userauth_success_unexpected);
- out:
- if (ccache != NULL)
- krb5_cc_close(*context, ccache);
- if (*auth_context)
- krb5_auth_con_free(*context, *auth_context);
- return (ret);
+ return 1;
}
-int
-userauth_kerberos(Authctxt *authctxt)
+void
+userauth_jpake_cleanup(Authctxt *authctxt)
{
- krb5_data ap;
- krb5_context *context;
- int ret = 0;
-
- if (ssh_krb5_helper(&ap, context) == 0)
- goto out;
-
- packet_start(SSH2_MSG_USERAUTH_REQUEST);
- packet_put_cstring(authctxt->server_user);
- packet_put_cstring(authctxt->service);
- packet_put_cstring(authctxt->method->name);
- packet_put_string(ap.data, ap.length);
- packet_send();
-
-#ifdef HEIMDAL
- krb5_data_free(&ap);
-#else
- krb5_free_data_contents(*context, &ap);
-#endif
- ret = 1;
-
-out:
- if (*context)
- krb5_free_context(*context);
- return ret;
+ debug3("%s: clean up", __func__);
+ if (authctxt->methoddata != NULL) {
+ jpake_free(authctxt->methoddata);
+ authctxt->methoddata = NULL;
+ }
+ dispatch_set(SSH2_MSG_USERAUTH_SUCCESS, &input_userauth_success);
}
-#endif
+#endif /* JPAKE */
/* find auth method */
buffer_free(&b);
return list;
}
+
andersk / openssh.git / blobdiff