| /* |
| * Copyright 2002 Niels Provos <provos@citi.umich.edu> |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include "includes.h" |
| RCSID("$OpenBSD$"); |
| |
| #include <openssl/bn.h> |
| #include <openssl/dh.h> |
| |
| #include "ssh.h" |
| #include "dh.h" |
| #include "kex.h" |
| #include "buffer.h" |
| #include "bufaux.h" |
| #include "packet.h" |
| #include "mac.h" |
| #include "log.h" |
| #include "zlib.h" |
| #include "monitor.h" |
| #include "monitor_wrap.h" |
| #include "xmalloc.h" |
| #include "atomicio.h" |
| #include "monitor_fdpass.h" |
| #include "getput.h" |
| |
| /* Imports */ |
| extern Newkeys *newkeys[]; |
| extern z_stream incoming_stream; |
| extern z_stream outgoing_stream; |
| |
| void |
| mm_request_send(int socket, enum monitor_reqtype type, Buffer *m) |
| { |
| u_char buf[5]; |
| u_int mlen = buffer_len(m); |
| |
| debug3("%s entering: type %d", __FUNCTION__, type); |
| |
| PUT_32BIT(buf, mlen + 1); |
| buf[4] = (u_char) type; /* 1st byte of payload is mesg-type */ |
| if (atomicio(write, socket, buf, sizeof(buf)) != sizeof(buf)) |
| fatal("%s: write", __FUNCTION__); |
| if (atomicio(write, socket, buffer_ptr(m), mlen) != mlen) |
| fatal("%s: write", __FUNCTION__); |
| } |
| |
| void |
| mm_request_receive(int socket, Buffer *m) |
| { |
| u_char buf[4]; |
| ssize_t res; |
| u_int msg_len; |
| |
| debug3("%s entering", __FUNCTION__); |
| |
| res = atomicio(read, socket, buf, sizeof(buf)); |
| if (res != sizeof(buf)) |
| fatal("%s: read: %d", __FUNCTION__, res); |
| msg_len = GET_32BIT(buf); |
| if (msg_len > 256 * 1024) |
| fatal("%s: read: bad msg_len %d", __FUNCTION__, msg_len); |
| buffer_clear(m); |
| buffer_append_space(m, msg_len); |
| res = atomicio(read, socket, buffer_ptr(m), msg_len); |
| if (res != msg_len) |
| fatal("%s: read: %d != msg_len", __FUNCTION__, res); |
| } |
| |
| void |
| mm_request_receive_expect(int socket, enum monitor_reqtype type, Buffer *m) |
| { |
| u_char rtype; |
| |
| debug3("%s entering: type %d", __FUNCTION__, type); |
| |
| mm_request_receive(socket, m); |
| rtype = buffer_get_char(m); |
| if (rtype != type) |
| fatal("%s: read: rtype %d != type %d", __FUNCTION__, |
| rtype, type); |
| } |
| |
| DH * |
| mm_choose_dh(int socket, int min, int nbits, int max) |
| { |
| BIGNUM *p, *g; |
| int success = 0; |
| Buffer m; |
| |
| buffer_init(&m); |
| buffer_put_int(&m, min); |
| buffer_put_int(&m, nbits); |
| buffer_put_int(&m, max); |
| |
| mm_request_send(socket, MONITOR_REQ_MODULI, &m); |
| |
| debug3("%s: waiting for MONITOR_ANS_MODULI", __FUNCTION__); |
| mm_request_receive_expect(socket, MONITOR_ANS_MODULI, &m); |
| |
| success = buffer_get_char(&m); |
| if (success == 0) |
| fatal("%s: MONITOR_ANS_MODULI failed", __FUNCTION__); |
| |
| if ((p = BN_new()) == NULL) |
| fatal("%s: BN_new failed", __FUNCTION__); |
| if ((g = BN_new()) == NULL) |
| fatal("%s: BN_new failed", __FUNCTION__); |
| buffer_get_bignum2(&m, p); |
| buffer_get_bignum2(&m, g); |
| |
| debug3("%s: remaining %d", __FUNCTION__, buffer_len(&m)); |
| buffer_free(&m); |
| |
| return (dh_new_group(g, p)); |
| } |
| |
| int |
| mm_key_sign(int socket, int keyind, u_char **sigp, u_int *lenp, |
| u_char *data, u_int datalen) |
| { |
| Buffer m; |
| |
| debug3("%s entering", __FUNCTION__); |
| |
| buffer_init(&m); |
| buffer_put_int(&m, keyind); |
| buffer_put_string(&m, data, datalen); |
| |
| mm_request_send(socket, MONITOR_REQ_SIGN, &m); |
| |
| debug3("%s: waiting for MONITOR_ANS_SIGN", __FUNCTION__); |
| mm_request_receive_expect(socket, MONITOR_ANS_SIGN, &m); |
| *sigp = buffer_get_string(&m, lenp); |
| buffer_free(&m); |
| |
| return (0); |
| } |
| |
| struct passwd * |
| mm_getpwnamallow(int socket, const char *login, int *allowed) |
| { |
| Buffer m; |
| struct passwd *pw; |
| u_int pwlen; |
| |
| debug3("%s entering", __FUNCTION__); |
| |
| buffer_init(&m); |
| buffer_put_cstring(&m, login); |
| |
| mm_request_send(socket, MONITOR_REQ_PWNAM, &m); |
| |
| debug3("%s: waiting for MONITOR_ANS_PWNAM", __FUNCTION__); |
| mm_request_receive_expect(socket, MONITOR_ANS_PWNAM, &m); |
| |
| *allowed = buffer_get_char(&m); |
| if (*allowed == 0) { |
| buffer_free(&m); |
| return (NULL); |
| } |
| pw = buffer_get_string(&m, &pwlen); |
| if (pwlen != sizeof(struct passwd)) |
| fatal("%s: struct passwd size mismatch", __FUNCTION__); |
| pw->pw_name = buffer_get_string(&m, NULL); |
| pw->pw_passwd = buffer_get_string(&m, NULL); |
| pw->pw_gecos = buffer_get_string(&m, NULL); |
| pw->pw_class = buffer_get_string(&m, NULL); |
| pw->pw_dir = buffer_get_string(&m, NULL); |
| pw->pw_shell = buffer_get_string(&m, NULL); |
| buffer_free(&m); |
| |
| return (pw); |
| } |
| |
| void |
| pwfree(struct passwd *pw) |
| { |
| xfree(pw->pw_name); |
| xfree(pw->pw_passwd); |
| xfree(pw->pw_gecos); |
| xfree(pw->pw_class); |
| xfree(pw->pw_dir); |
| xfree(pw->pw_shell); |
| xfree(pw); |
| } |
| |
| /* Inform the privileged process about service and style */ |
| |
| void |
| mm_inform_authserv(int socket, char *service, char *style) |
| { |
| Buffer m; |
| |
| debug3("%s entering", __FUNCTION__); |
| |
| buffer_init(&m); |
| buffer_put_cstring(&m, service); |
| buffer_put_cstring(&m, style ? style : ""); |
| |
| mm_request_send(socket, MONITOR_REQ_AUTHSERV, &m); |
| |
| buffer_free(&m); |
| } |
| |
| /* Do the password authentication */ |
| int |
| mm_auth_password(int socket, char *password) |
| { |
| Buffer m; |
| int authenticated = 0; |
| |
| debug3("%s entering", __FUNCTION__); |
| |
| buffer_init(&m); |
| buffer_put_cstring(&m, password); |
| mm_request_send(socket, MONITOR_REQ_AUTHPASSWORD, &m); |
| |
| debug3("%s: waiting for MONITOR_ANS_AUTHPASSWORD", __FUNCTION__); |
| mm_request_receive_expect(socket, MONITOR_ANS_AUTHPASSWORD, &m); |
| |
| authenticated = buffer_get_int(&m); |
| |
| buffer_free(&m); |
| |
| debug3("%s: user %sauthenticated", |
| __FUNCTION__, authenticated ? "" : "not "); |
| return (authenticated); |
| } |
| |
| int |
| mm_key_allowed(int socket, enum mm_keytype type, char *user, char *host, |
| Key *key) |
| { |
| Buffer m; |
| u_char *blob; |
| u_int len; |
| int allowed = 0; |
| |
| debug3("%s entering", __FUNCTION__); |
| |
| /* Convert the key to a blob and the pass it over */ |
| if (!key_to_blob(key, &blob, &len)) |
| return (0); |
| |
| buffer_init(&m); |
| buffer_put_int(&m, type); |
| buffer_put_cstring(&m, user ? user : ""); |
| buffer_put_cstring(&m, host ? host : ""); |
| buffer_put_string(&m, blob, len); |
| xfree(blob); |
| |
| mm_request_send(socket, MONITOR_REQ_KEYALLOWED, &m); |
| |
| debug3("%s: waiting for MONITOR_ANS_KEYALLOWED", __FUNCTION__); |
| mm_request_receive_expect(socket, MONITOR_ANS_KEYALLOWED, &m); |
| |
| allowed = buffer_get_int(&m); |
| |
| buffer_free(&m); |
| |
| return (allowed); |
| } |
| |
| /* |
| * This key verify needs to send the key type along, because the |
| * privileged parent makes the decision if the key is allowed |
| * for authentication. |
| */ |
| |
| int |
| mm_key_verify(int socket, enum mm_keytype type, char *user, char *host, |
| Key *key, u_char *sig, u_int siglen, u_char *data, u_int datalen) |
| { |
| Buffer m; |
| u_char *blob; |
| u_int len; |
| int verified = 0; |
| |
| debug3("%s entering", __FUNCTION__); |
| |
| /* Convert the key to a blob and the pass it over */ |
| if (!key_to_blob(key, &blob, &len)) |
| return (0); |
| |
| buffer_init(&m); |
| buffer_put_int(&m, type); |
| buffer_put_cstring(&m, user ? user : ""); |
| buffer_put_cstring(&m, host ? host : ""); |
| buffer_put_string(&m, blob, len); |
| buffer_put_string(&m, sig, siglen); |
| buffer_put_string(&m, data, datalen); |
| xfree(blob); |
| |
| mm_request_send(socket, MONITOR_REQ_KEYVERIFY, &m); |
| |
| debug3("%s: waiting for MONITOR_ANS_KEYVERIFY", __FUNCTION__); |
| mm_request_receive_expect(socket, MONITOR_ANS_KEYVERIFY, &m); |
| |
| verified = buffer_get_int(&m); |
| |
| buffer_free(&m); |
| |
| return (verified); |
| } |
| |
| /* Export key state after authentication */ |
| Newkeys * |
| mm_newkeys_from_blob(u_char *blob, int blen) |
| { |
| Buffer b; |
| int rlen; |
| Newkeys *newkey = NULL; |
| Enc *enc; |
| Mac *mac; |
| Comp *comp; |
| |
| debug3("%s: %p(%d)", __FUNCTION__, blob, blen); |
| #ifdef DEBUG_PK |
| dump_base64(stderr, blob, blen); |
| #endif |
| buffer_init(&b); |
| buffer_append(&b, blob, blen); |
| |
| newkey = xmalloc(sizeof(*newkey)); |
| enc = &newkey->enc; |
| mac = &newkey->mac; |
| comp = &newkey->comp; |
| |
| /* Enc structure */ |
| enc->name = buffer_get_string(&b, NULL); |
| buffer_get(&b, &enc->cipher, sizeof(enc->cipher)); |
| enc->enabled = buffer_get_int(&b); |
| enc->key_len = buffer_get_int(&b); |
| enc->block_size = buffer_get_int(&b); |
| enc->key = xmalloc(enc->key_len); |
| buffer_get(&b, enc->key, enc->key_len); |
| enc->iv = xmalloc(enc->block_size); |
| buffer_get(&b, enc->iv, enc->block_size); |
| |
| if (enc->name == NULL || cipher_by_name(enc->name) != enc->cipher) |
| fatal("%s: bad cipher name %s or pointer %p", __FUNCTION__, |
| enc->name, enc->cipher); |
| |
| /* Mac structure */ |
| mac->name = buffer_get_string(&b, NULL); |
| if (mac->name == NULL || mac_init(mac, mac->name) == -1) |
| fatal("%s: can not init mac %s", __FUNCTION__, mac->name); |
| mac->enabled = buffer_get_int(&b); |
| mac->key = xmalloc(mac->key_len); |
| buffer_get(&b, mac->key, mac->key_len); |
| |
| /* Comp structure */ |
| comp->type = buffer_get_int(&b); |
| comp->enabled = buffer_get_int(&b); |
| comp->name = buffer_get_string(&b, NULL); |
| |
| rlen = buffer_len(&b); |
| if (rlen != 0) |
| error("newkeys_from_blob: remaining bytes in blob %d", rlen); |
| buffer_free(&b); |
| return (newkey); |
| } |
| |
| int |
| mm_newkeys_to_blob(int mode, u_char **blobp, u_int *lenp) |
| { |
| Buffer b; |
| int len; |
| u_char *buf; |
| Enc *enc; |
| Mac *mac; |
| Comp *comp; |
| Newkeys *newkey = newkeys[mode]; |
| |
| debug3("%s: converting %p", __FUNCTION__, newkey); |
| |
| if (newkey == NULL) { |
| error("%s: newkey == NULL", __FUNCTION__); |
| return 0; |
| } |
| enc = &newkey->enc; |
| mac = &newkey->mac; |
| comp = &newkey->comp; |
| |
| buffer_init(&b); |
| /* Enc structure */ |
| buffer_put_cstring(&b, enc->name); |
| /* The cipher struct is constant and shared, you export pointer */ |
| buffer_append(&b, &enc->cipher, sizeof(enc->cipher)); |
| buffer_put_int(&b, enc->enabled); |
| buffer_put_int(&b, enc->key_len); |
| buffer_put_int(&b, enc->block_size); |
| buffer_append(&b, enc->key, enc->key_len); |
| packet_get_keyiv(mode, enc->iv, enc->block_size); |
| buffer_append(&b, enc->iv, enc->block_size); |
| |
| /* Mac structure */ |
| buffer_put_cstring(&b, mac->name); |
| buffer_put_int(&b, mac->enabled); |
| buffer_append(&b, mac->key, mac->key_len); |
| |
| /* Comp structure */ |
| buffer_put_int(&b, comp->type); |
| buffer_put_int(&b, comp->enabled); |
| buffer_put_cstring(&b, comp->name); |
| |
| len = buffer_len(&b); |
| buf = xmalloc(len); |
| memcpy(buf, buffer_ptr(&b), len); |
| memset(buffer_ptr(&b), 0, len); |
| buffer_free(&b); |
| if (lenp != NULL) |
| *lenp = len; |
| if (blobp != NULL) |
| *blobp = buf; |
| return len; |
| } |
| |
| void |
| mm_send_keystate(int socket) |
| { |
| Buffer m; |
| u_char *blob, *p; |
| u_int bloblen, plen; |
| |
| debug3("%s: Sending new keys: %p %p", |
| __FUNCTION__, newkeys[MODE_OUT], newkeys[MODE_IN]); |
| |
| buffer_init(&m); |
| |
| /* Keys from Kex */ |
| if (!mm_newkeys_to_blob(MODE_OUT, &blob, &bloblen)) |
| fatal("%s: conversion of newkeys failed", __FUNCTION__); |
| |
| buffer_put_string(&m, blob, bloblen); |
| xfree(blob); |
| |
| if (!mm_newkeys_to_blob(MODE_IN, &blob, &bloblen)) |
| fatal("%s: conversion of newkeys failed", __FUNCTION__); |
| |
| buffer_put_string(&m, blob, bloblen); |
| xfree(blob); |
| |
| buffer_put_int(&m, packet_get_seqnr(MODE_OUT)); |
| buffer_put_int(&m, packet_get_seqnr(MODE_IN)); |
| |
| debug3("%s: New keys have been sent", __FUNCTION__); |
| |
| /* More key context */ |
| plen = packet_get_keycontext(MODE_OUT, NULL); |
| p = xmalloc(plen+1); |
| packet_get_keycontext(MODE_OUT, p); |
| buffer_put_string(&m, p, plen); |
| xfree(p); |
| |
| plen = packet_get_keycontext(MODE_IN, NULL); |
| p = xmalloc(plen+1); |
| packet_get_keycontext(MODE_IN, p); |
| buffer_put_string(&m, p, plen); |
| xfree(p); |
| |
| /* Compression state */ |
| debug3("%s: Sending compression state", __FUNCTION__); |
| buffer_put_string(&m, &outgoing_stream, sizeof(outgoing_stream)); |
| buffer_put_string(&m, &incoming_stream, sizeof(incoming_stream)); |
| |
| mm_request_send(socket, MONITOR_REQ_KEYEXPORT, &m); |
| debug3("%s: Finished sending state", __FUNCTION__); |
| |
| buffer_free(&m); |
| } |
| |
| int |
| mm_pty_allocown(int socket, int *ptyfd, int *ttyfd, |
| char *namebuf, int namebuflen) |
| { |
| Buffer m; |
| u_char *p; |
| int success = 0; |
| |
| buffer_init(&m); |
| mm_request_send(socket, MONITOR_REQ_PTY, &m); |
| |
| debug3("%s: waiting for MONITOR_ANS_PTY", __FUNCTION__); |
| mm_request_receive_expect(socket, MONITOR_ANS_PTY, &m); |
| |
| success = buffer_get_int(&m); |
| if (success == 0) { |
| debug3("%s: pty alloc failed", __FUNCTION__); |
| buffer_free(&m); |
| return (0); |
| } |
| p = buffer_get_string(&m, NULL); |
| buffer_free(&m); |
| |
| strlcpy(namebuf, p, namebuflen); /* Possible truncation */ |
| xfree(p); |
| |
| *ptyfd = mm_receive_fd(socket); |
| *ttyfd = mm_receive_fd(socket); |
| |
| /* Success */ |
| return (1); |
| } |
| |
| /* Request process termination */ |
| |
| void |
| mm_terminate(int socket) |
| { |
| Buffer m; |
| |
| buffer_init(&m); |
| mm_request_send(socket, MONITOR_REQ_TERM, &m); |
| buffer_free(&m); |
| } |