int
mm_answer_sesskey(int sock, Buffer *m)
{
BIGNUM *p;
int rsafail;
/* Turn off permissions */
monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 0);
if ((p = BN_new()) == NULL)
fatal("%s: BN_new", __func__);
buffer_get_bignum2(m, p);
rsafail = ssh1_session_key(p);
buffer_clear(m);
buffer_put_int(m, rsafail);
buffer_put_bignum2(m, p);
BN_clear_free(p);
mm_request_send(sock, MONITOR_ANS_SESSKEY, m);
/* Turn on permissions for sessid passing */
monitor_permit(mon_dispatch, MONITOR_REQ_SESSID, 1);
return (0);
}
int
mm_answer_gss_accept_ctx(int sock, struct sshbuf *m)
{
gss_buffer_desc in;
gss_buffer_desc out = GSS_C_EMPTY_BUFFER;
OM_uint32 major, minor;
OM_uint32 flags = 0; /* GSI needs this */
size_t len;
u_char *p;
int r;
if ((r = sshbuf_get_string(m, &p, &len)) != 0)
fatal("%s: buffer error: %s", __func__, ssh_err(r));
in.value = p;
in.length = len;
major = ssh_gssapi_accept_ctx(gsscontext, &in, &out, &flags);
free(in.value);
sshbuf_reset(m);
if ((r = sshbuf_put_u32(m, major)) != 0 ||
(r = sshbuf_put_string(m, out.value, out.length)) != 0 ||
(r = sshbuf_put_u32(m, flags)) != 0)
fatal("%s: buffer error: %s", __func__, ssh_err(r));
mm_request_send(sock, MONITOR_ANS_GSSSTEP, m);
gss_release_buffer(&minor, &out);
if (major == GSS_S_COMPLETE) {
monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 0);
monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1);
monitor_permit(mon_dispatch, MONITOR_REQ_GSSCHECKMIC, 1);
}
return 0;
}
int
mm_answer_gss_accept_ctx(int sock, Buffer *m)
{
gss_buffer_desc in;
gss_buffer_desc out = GSS_C_EMPTY_BUFFER;
OM_uint32 major, minor;
OM_uint32 flags = 0; /* GSI needs this */
u_int len;
in.value = buffer_get_string(m, &len);
in.length = len;
major = ssh_gssapi_accept_ctx(gsscontext, &in, &out, &flags);
xfree(in.value);
buffer_clear(m);
buffer_put_int(m, major);
buffer_put_string(m, out.value, out.length);
buffer_put_int(m, flags);
mm_request_send(sock, MONITOR_ANS_GSSSTEP, m);
gss_release_buffer(&minor, &out);
if (major == GSS_S_COMPLETE) {
monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 0);
monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1);
monitor_permit(mon_dispatch, MONITOR_REQ_GSSCHECKMIC, 1);
}
return (0);
}
void
monitor_child_postauth(struct monitor *pmonitor)
{
close(pmonitor->m_recvfd);
pmonitor->m_recvfd = -1;
monitor_set_child_handler(pmonitor->m_pid);
signal(SIGHUP, &monitor_child_handler);
signal(SIGTERM, &monitor_child_handler);
signal(SIGINT, &monitor_child_handler);
#ifdef SIGXFSZ
signal(SIGXFSZ, SIG_IGN);
#endif
mon_dispatch = mon_dispatch_postauth20;
/* Permit requests for moduli and signatures */
monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1);
monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1);
monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1);
if (!no_pty_flag) {
monitor_permit(mon_dispatch, MONITOR_REQ_PTY, 1);
monitor_permit(mon_dispatch, MONITOR_REQ_PTYCLEANUP, 1);
}
for (;;)
monitor_read(pmonitor, mon_dispatch, NULL);
}
int
mm_answer_sesskey(int sock, struct sshbuf *m)
{
BIGNUM *p;
int r, rsafail;
/* Turn off permissions */
monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 0);
if ((p = BN_new()) == NULL)
fatal("%s: BN_new", __func__);
if ((r = sshbuf_get_bignum2(m, p)) != 0)
fatal("%s: buffer error: %s", __func__, ssh_err(r));
rsafail = ssh1_session_key(p);
sshbuf_reset(m);
if ((r = sshbuf_put_u32(m, rsafail)) != 0 ||
(r = sshbuf_put_bignum2(m, p)) != 0)
fatal("%s: buffer error: %s", __func__, ssh_err(r));
BN_clear_free(p);
mm_request_send(sock, MONITOR_ANS_SESSKEY, m);
/* Turn on permissions for sessid passing */
monitor_permit(mon_dispatch, MONITOR_REQ_SESSID, 1);
return (0);
}
int
mm_answer_pwnamallow(int sock, Buffer *m)
{
char *username;
struct passwd *pwent;
int allowed = 0;
debug3("%s", __func__);
if (authctxt->attempt++ != 0)
fatal("%s: multiple attempts for getpwnam", __func__);
username = buffer_get_string(m, NULL);
pwent = getpwnamallow(username);
authctxt->user = xstrdup(username);
setproctitle("%s [priv]", pwent ? username : "******");
xfree(username);
buffer_clear(m);
if (pwent == NULL) {
buffer_put_char(m, 0);
authctxt->pw = fakepw();
goto out;
}
allowed = 1;
authctxt->pw = pwent;
authctxt->valid = 1;
buffer_put_char(m, 1);
buffer_put_string(m, pwent, sizeof(struct passwd));
buffer_put_cstring(m, pwent->pw_name);
buffer_put_cstring(m, "*");
buffer_put_cstring(m, pwent->pw_gecos);
buffer_put_cstring(m, pwent->pw_class);
buffer_put_cstring(m, pwent->pw_dir);
buffer_put_cstring(m, pwent->pw_shell);
out:
buffer_put_string(m, &options, sizeof(options));
if (options.banner != NULL)
buffer_put_cstring(m, options.banner);
debug3("%s: sending MONITOR_ANS_PWNAM: %d", __func__, allowed);
mm_request_send(sock, MONITOR_ANS_PWNAM, m);
/* For SSHv1 allow authentication now */
if (!compat20)
monitor_permit_authentications(1);
else {
/* Allow service/style information on the auth context */
monitor_permit(mon_dispatch, MONITOR_REQ_AUTHSERV, 1);
monitor_permit(mon_dispatch, MONITOR_REQ_AUTH2_READ_BANNER, 1);
}
return (0);
}
Authctxt *
monitor_child_preauth(struct monitor *pmonitor)
{
struct mon_table *ent;
int authenticated = 0;
debug3("preauth child monitor started");
if (compat20) {
mon_dispatch = mon_dispatch_proto20;
/* Permit requests for moduli and signatures */
monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1);
monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1);
} else {
mon_dispatch = mon_dispatch_proto15;
monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 1);
}
authctxt = authctxt_new();
/* The first few requests do not require asynchronous access */
while (!authenticated) {
authenticated = monitor_read(pmonitor, mon_dispatch, &ent);
if (authenticated) {
if (!(ent->flags & MON_AUTHDECIDE))
fatal("%s: unexpected authentication from %d",
__func__, ent->type);
if (authctxt->pw->pw_uid == 0 &&
!auth_root_allowed(auth_method))
authenticated = 0;
#ifdef USE_PAM
if (!do_pam_account(authctxt->pw->pw_name, NULL))
authenticated = 0;
#endif
}
if (ent->flags & MON_AUTHDECIDE) {
auth_log(authctxt, authenticated, auth_method,
compat20 ? " ssh2" : "");
if (!authenticated)
authctxt->failures++;
}
}
if (!authctxt->valid)
fatal("%s: authenticated invalid user", __func__);
debug("%s: %s has been authenticated by privileged process",
__func__, authctxt->user);
mm_get_keystate(pmonitor);
return (authctxt);
}
int
mm_answer_rsa_keyallowed(int sock, struct sshbuf *m)
{
BIGNUM *client_n;
struct sshkey *key = NULL;
u_char *blob = NULL;
size_t blen = 0;
int r, allowed = 0;
debug3("%s entering", __func__);
auth_method = "rsa";
if (options.rsa_authentication && authctxt->valid) {
if ((client_n = BN_new()) == NULL)
fatal("%s: BN_new", __func__);
if ((r = sshbuf_get_bignum2(m, client_n)) != 0)
fatal("%s: buffer error: %s", __func__, ssh_err(r));
allowed = auth_rsa_key_allowed(authctxt->pw, client_n, &key);
BN_clear_free(client_n);
}
sshbuf_reset(m);
if ((r = sshbuf_put_u32(m, allowed)) != 0 ||
(r = sshbuf_put_u32(m, forced_command != NULL)) != 0)
fatal("%s: buffer error: %s", __func__, ssh_err(r));
/* clear temporarily storage (used by generate challenge) */
monitor_reset_key_state();
if (allowed && key != NULL) {
key->type = KEY_RSA; /* cheat for key_to_blob */
if ((r = sshkey_to_blob(key, &blob, &blen)) != 0)
fatal("%s: key_to_blob failed: %s",
__func__, ssh_err(r));
if ((r = sshbuf_put_string(m, blob, blen)) != 0)
fatal("%s: buffer error: %s", __func__, ssh_err(r));
/* Save temporarily for comparison in verify */
key_blob = blob;
key_bloblen = blen;
key_blobtype = MM_RSAUSERKEY;
}
if (key != NULL)
sshkey_free(key);
mm_request_send(sock, MONITOR_ANS_RSAKEYALLOWED, m);
monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed);
monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 0);
return (0);
}
int
mm_answer_pam_start(int sock, Buffer *m)
{
if (!options.use_pam)
fatal("UsePAM not set, but ended up in %s anyway", __func__);
start_pam(authctxt);
monitor_permit(mon_dispatch, MONITOR_REQ_PAM_ACCOUNT, 1);
if (options.kbd_interactive_authentication)
monitor_permit(mon_dispatch, MONITOR_REQ_PAM_INIT_CTX, 1);
return (0);
}
int
mm_answer_gss_checkmic(int sock, struct sshbuf *m)
{
gss_buffer_desc gssbuf, mic;
OM_uint32 ret;
size_t len;
int r;
u_char *p;
if ((r = sshbuf_get_string(m, &p, &len)) != 0)
fatal("%s: buffer error: %s", __func__, ssh_err(r));
gssbuf.value = p;
gssbuf.length = len;
if ((r = sshbuf_get_string(m, &p, &len)) != 0)
fatal("%s: buffer error: %s", __func__, ssh_err(r));
mic.value = p;
mic.length = len;
ret = ssh_gssapi_checkmic(gsscontext, &gssbuf, &mic);
free(gssbuf.value);
free(mic.value);
sshbuf_reset(m);
if ((r = sshbuf_put_u32(m, ret)) != 0)
fatal("%s: buffer error: %s", __func__, ssh_err(r));
mm_request_send(sock, MONITOR_ANS_GSSCHECKMIC, m);
if (!GSS_ERROR(ret))
monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1);
return 0;
}
int
mm_answer_gss_setup_ctx(int sock, struct sshbuf *m)
{
gss_OID_desc goid;
OM_uint32 major;
size_t len;
u_char *p;
int r;
if ((r = sshbuf_get_string(m, &p, &len)) != 0)
fatal("%s: buffer error: %s", __func__, ssh_err(r));
goid.elements = p;
goid.length = len;
major = ssh_gssapi_server_ctx(&gsscontext, &goid);
free(goid.elements);
sshbuf_reset(m);
if ((r = sshbuf_put_u32(m, major)) != 0)
fatal("%s: buffer error: %s", __func__, ssh_err(r));
mm_request_send(sock, MONITOR_ANS_GSSSETUP, m);
/* Now we have a context, enable the step */
monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 1);
return (0);
}
int
mm_answer_jpake_check_confirm(int sock, Buffer *m)
{
int authenticated = 0;
u_char *peer_confirm_hash;
u_int peer_confirm_hash_len;
struct jpake_ctx *pctx = authctxt->jpake_ctx;
if (pctx == NULL)
fatal("%s: pctx == NULL", __func__);
peer_confirm_hash = buffer_get_string(m, &peer_confirm_hash_len);
authenticated = jpake_check_confirm(pctx->k,
pctx->client_id, pctx->client_id_len,
session_id2, session_id2_len,
peer_confirm_hash, peer_confirm_hash_len) && authctxt->valid;
JPAKE_DEBUG_CTX((pctx, "check_confirm done in %s", __func__));
bzero(peer_confirm_hash, peer_confirm_hash_len);
xfree(peer_confirm_hash);
buffer_clear(m);
buffer_put_int(m, authenticated);
debug3("%s: sending result %d", __func__, authenticated);
mm_request_send(sock, MONITOR_ANS_JPAKE_CHECK_CONFIRM, m);
monitor_permit(mon_dispatch, MONITOR_REQ_JPAKE_STEP1, 1);
auth_method = "*****@*****.**";
return authenticated;
}
int
mm_answer_gss_setup_ctx(int sock, Buffer *m)
{
gss_OID_desc goid;
OM_uint32 major;
u_int len;
if (!options.gss_authentication)
fatal("%s: GSSAPI authentication not enabled", __func__);
goid.elements = buffer_get_string(m, &len);
goid.length = len;
major = ssh_gssapi_server_ctx(&gsscontext, &goid);
free(goid.elements);
buffer_clear(m);
buffer_put_int(m, major);
mm_request_send(sock, MONITOR_ANS_GSSSETUP, m);
/* Now we have a context, enable the step */
monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 1);
return (0);
}
int
mm_answer_gss_checkmic(int sock, Buffer *m)
{
gss_buffer_desc gssbuf, mic;
OM_uint32 ret;
u_int len;
gssbuf.value = buffer_get_string(m, &len);
gssbuf.length = len;
mic.value = buffer_get_string(m, &len);
mic.length = len;
ret = ssh_gssapi_checkmic(gsscontext, &gssbuf, &mic);
xfree(gssbuf.value);
xfree(mic.value);
buffer_clear(m);
buffer_put_int(m, ret);
mm_request_send(sock, MONITOR_ANS_GSSCHECKMIC, m);
if (!GSS_ERROR(ret))
monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1);
return (0);
}
int
mm_answer_rsa_challenge(int sock, Buffer *m)
{
Key *key = NULL;
u_char *blob;
u_int blen;
debug3("%s entering", __func__);
if (!authctxt->valid)
fatal("%s: authctxt not valid", __func__);
blob = buffer_get_string(m, &blen);
if (!monitor_allowed_key(blob, blen))
fatal("%s: bad key, not previously allowed", __func__);
if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY)
fatal("%s: key type mismatch", __func__);
if ((key = key_from_blob(blob, blen)) == NULL)
fatal("%s: received bad key", __func__);
if (ssh1_challenge)
BN_clear_free(ssh1_challenge);
ssh1_challenge = auth_rsa_generate_challenge(key);
buffer_clear(m);
buffer_put_bignum2(m, ssh1_challenge);
debug3("%s sending reply", __func__);
mm_request_send(sock, MONITOR_ANS_RSACHALLENGE, m);
monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 1);
xfree(blob);
key_free(key);
return (0);
}
int
mm_answer_jpake_get_pwdata(int sock, Buffer *m)
{
struct jpake_ctx *pctx = authctxt->jpake_ctx;
char *hash_scheme, *salt;
if (pctx == NULL)
fatal("%s: pctx == NULL", __func__);
auth2_jpake_get_pwdata(authctxt, &pctx->s, &hash_scheme, &salt);
buffer_clear(m);
/* pctx->s is sensitive, not returned to slave */
buffer_put_cstring(m, hash_scheme);
buffer_put_cstring(m, salt);
debug3("%s: sending pwdata", __func__);
mm_request_send(sock, MONITOR_ANS_JPAKE_GET_PWDATA, m);
bzero(hash_scheme, strlen(hash_scheme));
bzero(salt, strlen(salt));
xfree(hash_scheme);
xfree(salt);
monitor_permit(mon_dispatch, MONITOR_REQ_JPAKE_STEP2, 1);
return 0;
}
int
mm_answer_rsa_keyallowed(int socket, Buffer *m)
{
BIGNUM *client_n;
Key *key = NULL;
u_char *blob = NULL;
u_int blen = 0;
int allowed = 0;
debug3("%s entering", __func__);
if (options.rsa_authentication && authctxt->valid) {
if ((client_n = BN_new()) == NULL)
fatal("%s: BN_new", __func__);
buffer_get_bignum2(m, client_n);
allowed = auth_rsa_key_allowed(authctxt->pw, client_n, &key);
BN_clear_free(client_n);
}
buffer_clear(m);
buffer_put_int(m, allowed);
/* clear temporarily storage (used by generate challenge) */
monitor_reset_key_state();
if (allowed && key != NULL) {
key->type = KEY_RSA; /* cheat for key_to_blob */
if (key_to_blob(key, &blob, &blen) == 0)
fatal("%s: key_to_blob failed", __func__);
buffer_put_string(m, blob, blen);
/* Save temporarily for comparison in verify */
key_blob = blob;
key_bloblen = blen;
key_blobtype = MM_RSAUSERKEY;
key_free(key);
}
mm_append_debug(m);
mm_request_send(socket, MONITOR_ANS_RSAKEYALLOWED, m);
monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed);
monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 0);
return (0);
}
int
mm_answer_jpake_step1(int sock, Buffer *m)
{
struct jpake_ctx *pctx;
u_char *x3_proof, *x4_proof;
u_int x3_proof_len, x4_proof_len;
if (!options.zero_knowledge_password_authentication)
fatal("zero_knowledge_password_authentication disabled");
if (authctxt->jpake_ctx != NULL)
fatal("%s: authctxt->jpake_ctx already set (%p)",
__func__, authctxt->jpake_ctx);
authctxt->jpake_ctx = pctx = jpake_new();
jpake_step1(pctx->grp,
&pctx->server_id, &pctx->server_id_len,
&pctx->x3, &pctx->x4, &pctx->g_x3, &pctx->g_x4,
&x3_proof, &x3_proof_len,
&x4_proof, &x4_proof_len);
JPAKE_DEBUG_CTX((pctx, "step1 done in %s", __func__));
buffer_clear(m);
buffer_put_string(m, pctx->server_id, pctx->server_id_len);
buffer_put_bignum2(m, pctx->g_x3);
buffer_put_bignum2(m, pctx->g_x4);
buffer_put_string(m, x3_proof, x3_proof_len);
buffer_put_string(m, x4_proof, x4_proof_len);
debug3("%s: sending step1", __func__);
mm_request_send(sock, MONITOR_ANS_JPAKE_STEP1, m);
bzero(x3_proof, x3_proof_len);
bzero(x4_proof, x4_proof_len);
xfree(x3_proof);
xfree(x4_proof);
monitor_permit(mon_dispatch, MONITOR_REQ_JPAKE_GET_PWDATA, 1);
monitor_permit(mon_dispatch, MONITOR_REQ_JPAKE_STEP1, 0);
return 0;
}
int
mm_answer_pam_init_ctx(int sock, Buffer *m)
{
debug3("%s", __func__);
if (!options.kbd_interactive_authentication)
fatal("%s: kbd-int authentication not enabled", __func__);
if (sshpam_ctxt != NULL)
fatal("%s: already called", __func__);
sshpam_ctxt = (sshpam_device.init_ctx)(authctxt);
sshpam_authok = NULL;
buffer_clear(m);
if (sshpam_ctxt != NULL) {
monitor_permit(mon_dispatch, MONITOR_REQ_PAM_FREE_CTX, 1);
monitor_permit(mon_dispatch, MONITOR_REQ_PAM_QUERY, 1);
buffer_put_int(m, 1);
} else {
buffer_put_int(m, 0);
}
mm_request_send(sock, MONITOR_ANS_PAM_INIT_CTX, m);
return (0);
}
void
monitor_child_postauth(struct monitor *pmonitor)
{
monitor_set_child_handler(pmonitor->m_pid);
signal(SIGHUP, &monitor_child_handler);
signal(SIGTERM, &monitor_child_handler);
if (compat20) {
mon_dispatch = mon_dispatch_postauth20;
/* Permit requests for moduli and signatures */
monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1);
monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1);
monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1);
} else {
mon_dispatch = mon_dispatch_postauth15;
monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1);
}
if (!no_pty_flag) {
monitor_permit(mon_dispatch, MONITOR_REQ_PTY, 1);
monitor_permit(mon_dispatch, MONITOR_REQ_PTYCLEANUP, 1);
}
for (;;)
monitor_read(pmonitor, mon_dispatch, NULL);
}
int
mm_answer_jpake_step2(int sock, Buffer *m)
{
struct jpake_ctx *pctx = authctxt->jpake_ctx;
u_char *x1_proof, *x2_proof, *x4_s_proof;
u_int x1_proof_len, x2_proof_len, x4_s_proof_len;
if (pctx == NULL)
fatal("%s: pctx == NULL", __func__);
if ((pctx->g_x1 = BN_new()) == NULL ||
(pctx->g_x2 = BN_new()) == NULL)
fatal("%s: BN_new", __func__);
buffer_get_bignum2(m, pctx->g_x1);
buffer_get_bignum2(m, pctx->g_x2);
pctx->client_id = buffer_get_string(m, &pctx->client_id_len);
x1_proof = buffer_get_string(m, &x1_proof_len);
x2_proof = buffer_get_string(m, &x2_proof_len);
jpake_step2(pctx->grp, pctx->s, pctx->g_x3,
pctx->g_x1, pctx->g_x2, pctx->x4,
pctx->client_id, pctx->client_id_len,
pctx->server_id, pctx->server_id_len,
x1_proof, x1_proof_len,
x2_proof, x2_proof_len,
&pctx->b,
&x4_s_proof, &x4_s_proof_len);
JPAKE_DEBUG_CTX((pctx, "step2 done in %s", __func__));
bzero(x1_proof, x1_proof_len);
bzero(x2_proof, x2_proof_len);
xfree(x1_proof);
xfree(x2_proof);
buffer_clear(m);
buffer_put_bignum2(m, pctx->b);
buffer_put_string(m, x4_s_proof, x4_s_proof_len);
debug3("%s: sending step2", __func__);
mm_request_send(sock, MONITOR_ANS_JPAKE_STEP2, m);
bzero(x4_s_proof, x4_s_proof_len);
xfree(x4_s_proof);
monitor_permit(mon_dispatch, MONITOR_REQ_JPAKE_KEY_CONFIRM, 1);
return 0;
}
int
mm_answer_sign(int sock, Buffer *m)
{
Key *key;
u_char *p;
u_char *signature;
u_int siglen, datlen;
int keyid;
debug3("%s", __func__);
keyid = buffer_get_int(m);
p = buffer_get_string(m, &datlen);
/*
* Supported KEX types will only return SHA1 (20 byte) or
* SHA256 (32 byte) hashes
*/
if (datlen != 20 && datlen != 32)
fatal("%s: data length incorrect: %u", __func__, datlen);
/* save session id, it will be passed on the first call */
if (session_id2_len == 0) {
session_id2_len = datlen;
session_id2 = xmalloc(session_id2_len);
memcpy(session_id2, p, session_id2_len);
}
if ((key = get_hostkey_by_index(keyid)) == NULL)
fatal("%s: no hostkey from index %d", __func__, keyid);
if (key_sign(key, &signature, &siglen, p, datlen) < 0)
fatal("%s: key_sign failed", __func__);
debug3("%s: signature %p(%u)", __func__, signature, siglen);
buffer_clear(m);
buffer_put_string(m, signature, siglen);
xfree(p);
xfree(signature);
mm_request_send(sock, MONITOR_ANS_SIGN, m);
/* Turn on permissions for getpwnam */
monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1);
return (0);
}
int
mm_answer_sessid(int sock, Buffer *m)
{
int i;
debug3("%s entering", __func__);
if (buffer_len(m) != 16)
fatal("%s: bad ssh1 session id", __func__);
for (i = 0; i < 16; i++)
session_id[i] = buffer_get_char(m);
/* Turn on permissions for getpwnam */
monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1);
return (0);
}
int
mm_answer_pam_init_ctx(int sock, Buffer *m)
{
debug3("%s", __func__);
authctxt->user = buffer_get_string(m, NULL);
sshpam_ctxt = (sshpam_device.init_ctx)(authctxt);
sshpam_authok = NULL;
buffer_clear(m);
if (sshpam_ctxt != NULL) {
monitor_permit(mon_dispatch, MONITOR_REQ_PAM_FREE_CTX, 1);
buffer_put_int(m, 1);
} else {
buffer_put_int(m, 0);
}
mm_request_send(sock, MONITOR_ANS_PAM_INIT_CTX, m);
return (0);
}
int
mm_answer_pam_free_ctx(int sock, Buffer *m)
{
int r = sshpam_authok != NULL && sshpam_authok == sshpam_ctxt;
debug3("%s", __func__);
if (sshpam_ctxt == NULL)
fatal("%s: no context", __func__);
(sshpam_device.free_ctx)(sshpam_ctxt);
sshpam_ctxt = sshpam_authok = NULL;
buffer_clear(m);
mm_request_send(sock, MONITOR_ANS_PAM_FREE_CTX, m);
/* Allow another attempt */
monitor_permit(mon_dispatch, MONITOR_REQ_PAM_INIT_CTX, 1);
auth_method = "keyboard-interactive";
auth_submethod = "pam";
return r;
}
int
mm_answer_sessid(int sock, struct sshbuf *m)
{
int r;
debug3("%s entering", __func__);
if (sshbuf_len(m) != 16)
fatal("%s: bad ssh1 session id, len = %zu",
__func__, sshbuf_len(m));
if ((r = sshbuf_get(m, session_id, 16)) != 0)
fatal("%s: buffer error: %s", __func__, ssh_err(r));
/* Turn on permissions for getpwnam */
monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1);
return (0);
}
int
mm_answer_rsa_challenge(int sock, struct sshbuf *m)
{
struct sshkey *key = NULL;
u_char *blob;
size_t blen;
int r;
debug3("%s entering", __func__);
if (!authctxt->valid)
fatal("%s: authctxt not valid", __func__);
if ((r = sshbuf_get_string(m, &blob, &blen)) != 0)
fatal("%s: buffer error: %s", __func__, ssh_err(r));
if (!monitor_allowed_key(blob, blen))
fatal("%s: bad key, not previously allowed", __func__);
if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY)
fatal("%s: key type mismatch", __func__);
if ((r = sshkey_from_blob(blob, blen, &key)) != 0)
fatal("%s: received bad key: %s", __func__, ssh_err(r));
if (key->type != KEY_RSA)
fatal("%s: received bad key type %d", __func__, key->type);
key->type = KEY_RSA1;
if (ssh1_challenge)
BN_clear_free(ssh1_challenge);
ssh1_challenge = auth_rsa_generate_challenge(key);
sshbuf_reset(m);
if ((r = sshbuf_put_bignum2(m, ssh1_challenge)) != 0)
fatal("%s: buffer error: %s", __func__, ssh_err(r));
debug3("%s sending reply", __func__);
mm_request_send(sock, MONITOR_ANS_RSACHALLENGE, m);
monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 1);
free(blob);
sshkey_free(key);
return (0);
}
int
mm_answer_jpake_key_confirm(int sock, Buffer *m)
{
struct jpake_ctx *pctx = authctxt->jpake_ctx;
u_char *x2_s_proof;
u_int x2_s_proof_len;
if (pctx == NULL)
fatal("%s: pctx == NULL", __func__);
if ((pctx->a = BN_new()) == NULL)
fatal("%s: BN_new", __func__);
buffer_get_bignum2(m, pctx->a);
x2_s_proof = buffer_get_string(m, &x2_s_proof_len);
jpake_key_confirm(pctx->grp, pctx->s, pctx->a,
pctx->x4, pctx->g_x3, pctx->g_x4, pctx->g_x1, pctx->g_x2,
pctx->server_id, pctx->server_id_len,
pctx->client_id, pctx->client_id_len,
session_id2, session_id2_len,
x2_s_proof, x2_s_proof_len,
&pctx->k,
&pctx->h_k_sid_sessid, &pctx->h_k_sid_sessid_len);
JPAKE_DEBUG_CTX((pctx, "key_confirm done in %s", __func__));
bzero(x2_s_proof, x2_s_proof_len);
buffer_clear(m);
/* pctx->k is sensitive, not sent */
buffer_put_string(m, pctx->h_k_sid_sessid, pctx->h_k_sid_sessid_len);
debug3("%s: sending confirmation hash", __func__);
mm_request_send(sock, MONITOR_ANS_JPAKE_KEY_CONFIRM, m);
monitor_permit(mon_dispatch, MONITOR_REQ_JPAKE_CHECK_CONFIRM, 1);
return 0;
}
int
mm_answer_pam_query(int sock, Buffer *m)
{
char *name = NULL, *info = NULL, **prompts = NULL;
u_int i, num = 0, *echo_on = 0;
int ret;
debug3("%s", __func__);
sshpam_authok = NULL;
if (sshpam_ctxt == NULL)
fatal("%s: no context", __func__);
ret = (sshpam_device.query)(sshpam_ctxt, &name, &info,
&num, &prompts, &echo_on);
if (ret == 0 && num == 0)
sshpam_authok = sshpam_ctxt;
if (num > 1 || name == NULL || info == NULL)
fatal("sshpam_device.query failed");
monitor_permit(mon_dispatch, MONITOR_REQ_PAM_RESPOND, 1);
buffer_clear(m);
buffer_put_int(m, ret);
buffer_put_cstring(m, name);
free(name);
buffer_put_cstring(m, info);
free(info);
buffer_put_int(m, sshpam_get_maxtries_reached());
buffer_put_int(m, num);
for (i = 0; i < num; ++i) {
buffer_put_cstring(m, prompts[i]);
free(prompts[i]);
buffer_put_int(m, echo_on[i]);
}
free(prompts);
free(echo_on);
auth_method = "keyboard-interactive";
auth_submethod = "pam";
mm_request_send(sock, MONITOR_ANS_PAM_QUERY, m);
return (0);
}
int
mm_answer_keyallowed(int sock, Buffer *m)
{
Key *key;
char *cuser, *chost;
u_char *blob;
u_int bloblen;
enum mm_keytype type = 0;
int allowed = 0;
debug3("%s entering", __func__);
type = buffer_get_int(m);
cuser = buffer_get_string(m, NULL);
chost = buffer_get_string(m, NULL);
blob = buffer_get_string(m, &bloblen);
key = key_from_blob(blob, bloblen);
if ((compat20 && type == MM_RSAHOSTKEY) ||
(!compat20 && type != MM_RSAHOSTKEY))
fatal("%s: key type and protocol mismatch", __func__);
debug3("%s: key_from_blob: %p", __func__, key);
if (key != NULL && authctxt->valid) {
switch (type) {
case MM_USERKEY:
allowed = options.pubkey_authentication &&
user_key_allowed(authctxt->pw, key);
break;
case MM_HOSTKEY:
allowed = options.hostbased_authentication &&
hostbased_key_allowed(authctxt->pw,
cuser, chost, key);
break;
case MM_RSAHOSTKEY:
key->type = KEY_RSA1; /* XXX */
allowed = options.rhosts_rsa_authentication &&
auth_rhosts_rsa_key_allowed(authctxt->pw,
cuser, chost, key);
break;
default:
fatal("%s: unknown key type %d", __func__, type);
break;
}
}
if (key != NULL)
key_free(key);
/* clear temporarily storage (used by verify) */
monitor_reset_key_state();
if (allowed) {
/* Save temporarily for comparison in verify */
key_blob = blob;
key_bloblen = bloblen;
key_blobtype = type;
hostbased_cuser = cuser;
hostbased_chost = chost;
}
debug3("%s: key %p is %s",
__func__, key, allowed ? "allowed" : "disallowed");
buffer_clear(m);
buffer_put_int(m, allowed);
buffer_put_int(m, forced_command != NULL);
mm_append_debug(m);
mm_request_send(sock, MONITOR_ANS_KEYALLOWED, m);
if (type == MM_RSAHOSTKEY)
monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed);
return (0);
}
