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upstream commit
switch auth2-hostbased.c to modern APIs; ok djm@ Upstream-ID: 146af25c36daeeb83d5dbbb8ca52b5d25de88f4e
This commit is contained in:
markus@openbsd.org
Damien Miller
parent
2ae666a8fc
commit
eb76698b91
@ -1,4 +1,4 @@
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/* $OpenBSD: auth2-hostbased.c,v 1.28 2017/05/30 14:10:53 markus Exp $ */
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/* $OpenBSD: auth2-hostbased.c,v 1.29 2017/05/30 14:25:42 markus Exp $ */
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/*
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* Copyright (c) 2000 Markus Friedl. All rights reserved.
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*
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@ -39,7 +39,7 @@
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#include "misc.h"
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#include "servconf.h"
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#include "compat.h"
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#include "key.h"
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#include "sshkey.h"
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#include "hostfile.h"
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#include "auth.h"
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#include "canohost.h"
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@ -48,6 +48,7 @@
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#endif
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#include "monitor_wrap.h"
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#include "pathnames.h"
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#include "ssherr.h"
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#include "match.h"
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/* import */
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@ -58,52 +59,54 @@ extern u_int session_id2_len;
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static int
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userauth_hostbased(Authctxt *authctxt)
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{
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Buffer b;
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struct ssh *ssh = active_state; /* XXX */
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struct sshbuf *b;
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struct sshkey *key = NULL;
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char *pkalg, *cuser, *chost, *service;
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u_char *pkblob, *sig;
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u_int alen, blen, slen;
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int pktype;
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int authenticated = 0;
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size_t alen, blen, slen;
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int r, pktype, authenticated = 0;
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if (!authctxt->valid) {
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debug2("userauth_hostbased: disabled because of invalid user");
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debug2("%s: disabled because of invalid user", __func__);
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return 0;
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}
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pkalg = packet_get_string(&alen);
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pkblob = packet_get_string(&blen);
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chost = packet_get_string(NULL);
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cuser = packet_get_string(NULL);
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sig = packet_get_string(&slen);
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/* XXX use sshkey_froms() */
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if ((r = sshpkt_get_cstring(ssh, &pkalg, &alen)) != 0 ||
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(r = sshpkt_get_string(ssh, &pkblob, &blen)) != 0 ||
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(r = sshpkt_get_cstring(ssh, &chost, NULL)) != 0 ||
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(r = sshpkt_get_cstring(ssh, &cuser, NULL)) != 0 ||
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(r = sshpkt_get_string(ssh, &sig, &slen)) != 0)
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fatal("%s: packet parsing: %s", __func__, ssh_err(r));
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debug("userauth_hostbased: cuser %s chost %s pkalg %s slen %d",
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debug("%s: cuser %s chost %s pkalg %s slen %zu", __func__,
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cuser, chost, pkalg, slen);
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#ifdef DEBUG_PK
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debug("signature:");
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buffer_init(&b);
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buffer_append(&b, sig, slen);
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buffer_dump(&b);
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buffer_free(&b);
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sshbuf_dump_data(sig, siglen, stderr);
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#endif
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pktype = key_type_from_name(pkalg);
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pktype = sshkey_type_from_name(pkalg);
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if (pktype == KEY_UNSPEC) {
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/* this is perfectly legal */
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logit("userauth_hostbased: unsupported "
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"public key algorithm: %s", pkalg);
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logit("%s: unsupported public key algorithm: %s",
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__func__, pkalg);
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goto done;
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}
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if ((r = sshkey_from_blob(pkblob, blen, &key)) != 0) {
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error("%s: key_from_blob: %s", __func__, ssh_err(r));
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goto done;
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}
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key = key_from_blob(pkblob, blen);
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if (key == NULL) {
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error("userauth_hostbased: cannot decode key: %s", pkalg);
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error("%s: cannot decode key: %s", __func__, pkalg);
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goto done;
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}
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if (key->type != pktype) {
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error("userauth_hostbased: type mismatch for decoded key "
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"(received %d, expected %d)", key->type, pktype);
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error("%s: type mismatch for decoded key "
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"(received %d, expected %d)", __func__, key->type, pktype);
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goto done;
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}
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if (key_type_plain(key->type) == KEY_RSA &&
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(datafellows & SSH_BUG_RSASIGMD5) != 0) {
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if (sshkey_type_plain(key->type) == KEY_RSA &&
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(ssh->compat & SSH_BUG_RSASIGMD5) != 0) {
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error("Refusing RSA key because peer uses unsafe "
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"signature format");
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goto done;
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@ -115,21 +118,23 @@ userauth_hostbased(Authctxt *authctxt)
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goto done;
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}
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service = datafellows & SSH_BUG_HBSERVICE ? "ssh-userauth" :
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service = ssh->compat & SSH_BUG_HBSERVICE ? "ssh-userauth" :
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authctxt->service;
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buffer_init(&b);
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buffer_put_string(&b, session_id2, session_id2_len);
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if ((b = sshbuf_new()) == NULL)
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fatal("%s: sshbuf_new failed", __func__);
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/* reconstruct packet */
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buffer_put_char(&b, SSH2_MSG_USERAUTH_REQUEST);
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buffer_put_cstring(&b, authctxt->user);
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buffer_put_cstring(&b, service);
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buffer_put_cstring(&b, "hostbased");
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buffer_put_string(&b, pkalg, alen);
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buffer_put_string(&b, pkblob, blen);
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buffer_put_cstring(&b, chost);
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buffer_put_cstring(&b, cuser);
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if ((r = sshbuf_put_string(b, session_id2, session_id2_len)) != 0 ||
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(r = sshbuf_put_u8(b, SSH2_MSG_USERAUTH_REQUEST)) != 0 ||
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(r = sshbuf_put_cstring(b, authctxt->user)) != 0 ||
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(r = sshbuf_put_cstring(b, service)) != 0 ||
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(r = sshbuf_put_cstring(b, "hostbased")) != 0 ||
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(r = sshbuf_put_string(b, pkalg, alen)) != 0 ||
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(r = sshbuf_put_string(b, pkblob, blen)) != 0 ||
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(r = sshbuf_put_cstring(b, chost)) != 0 ||
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(r = sshbuf_put_cstring(b, cuser)) != 0)
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fatal("%s: buffer error: %s", __func__, ssh_err(r));
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#ifdef DEBUG_PK
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buffer_dump(&b);
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sshbuf_dump(b, stderr);
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#endif
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pubkey_auth_info(authctxt, key,
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@ -138,15 +143,15 @@ userauth_hostbased(Authctxt *authctxt)
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/* test for allowed key and correct signature */
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authenticated = 0;
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if (PRIVSEP(hostbased_key_allowed(authctxt->pw, cuser, chost, key)) &&
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PRIVSEP(sshkey_verify(key, sig, slen, buffer_ptr(&b),
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buffer_len(&b), 0)) == 0)
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PRIVSEP(sshkey_verify(key, sig, slen,
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sshbuf_ptr(b), sshbuf_len(b), ssh->compat)) == 0)
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authenticated = 1;
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buffer_free(&b);
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sshbuf_free(b);
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done:
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debug2("userauth_hostbased: authenticated %d", authenticated);
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debug2("%s: authenticated %d", __func__, authenticated);
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if (key != NULL)
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key_free(key);
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sshkey_free(key);
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free(pkalg);
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free(pkblob);
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free(cuser);
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@ -203,8 +208,8 @@ hostbased_key_allowed(struct passwd *pw, const char *cuser, char *chost,
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}
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debug2("%s: access allowed by auth_rhosts2", __func__);
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if (key_is_cert(key) &&
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key_cert_check_authority(key, 1, 0, lookup, &reason)) {
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if (sshkey_is_cert(key) &&
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sshkey_cert_check_authority(key, 1, 0, lookup, &reason)) {
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error("%s", reason);
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auth_debug_add("%s", reason);
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return 0;
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@ -223,20 +228,20 @@ hostbased_key_allowed(struct passwd *pw, const char *cuser, char *chost,
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}
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if (host_status == HOST_OK) {
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if (key_is_cert(key)) {
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if (sshkey_is_cert(key)) {
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if ((fp = sshkey_fingerprint(key->cert->signature_key,
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options.fingerprint_hash, SSH_FP_DEFAULT)) == NULL)
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fatal("%s: sshkey_fingerprint fail", __func__);
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verbose("Accepted certificate ID \"%s\" signed by "
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"%s CA %s from %s@%s", key->cert->key_id,
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key_type(key->cert->signature_key), fp,
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sshkey_type(key->cert->signature_key), fp,
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cuser, lookup);
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} else {
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if ((fp = sshkey_fingerprint(key,
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options.fingerprint_hash, SSH_FP_DEFAULT)) == NULL)
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fatal("%s: sshkey_fingerprint fail", __func__);
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verbose("Accepted %s public key %s from %s@%s",
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key_type(key), fp, cuser, lookup);
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sshkey_type(key), fp, cuser, lookup);
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}
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free(fp);
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}
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