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@@ -0,0 +1,447 @@
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+ diff --git a/PROTOCOL b/PROTOCOL
|
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+ index d453c779..ded935eb 100644
|
| |
+ --- a/PROTOCOL
|
| |
+ +++ b/PROTOCOL
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| |
+ @@ -137,6 +137,32 @@ than as a named global or channel request to allow pings with very
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| |
+ described at:
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+ http://git.libssh.org/users/aris/libssh.git/plain/doc/curve25519-sha256@libssh.org.txt?h=curve25519
|
| |
+
|
| |
+ +1.9 transport: strict key exchange extension
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+ +
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| |
+ +OpenSSH supports a number of transport-layer hardening measures under
|
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+ +a "strict KEX" feature. This feature is signalled similarly to the
|
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+ +RFC8308 ext-info feature: by including a additional algorithm in the
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+ +initiial SSH2_MSG_KEXINIT kex_algorithms field. The client may append
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+ +"kex-strict-c-v00@openssh.com" to its kex_algorithms and the server
|
| |
+ +may append "kex-strict-s-v00@openssh.com". These pseudo-algorithms
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+ +are only valid in the initial SSH2_MSG_KEXINIT and MUST be ignored
|
| |
+ +if they are present in subsequent SSH2_MSG_KEXINIT packets.
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+ +
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| |
+ +When an endpoint that supports this extension observes this algorithm
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+ +name in a peer's KEXINIT packet, it MUST make the following changes to
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+ +the the protocol:
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+ +
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+ +a) During initial KEX, terminate the connection if any unexpected or
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+ + out-of-sequence packet is received. This includes terminating the
|
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+ + connection if the first packet received is not SSH2_MSG_KEXINIT.
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+ + Unexpected packets for the purpose of strict KEX include messages
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+ + that are otherwise valid at any time during the connection such as
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+ + SSH2_MSG_DEBUG and SSH2_MSG_IGNORE.
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+ +b) After sending or receiving a SSH2_MSG_NEWKEYS message, reset the
|
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+ + packet sequence number to zero. This behaviour persists for the
|
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+ + duration of the connection (i.e. not just the first
|
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+ + SSH2_MSG_NEWKEYS).
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+ +
|
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+ 2. Connection protocol changes
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+
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+ 2.1. connection: Channel write close extension "eow@openssh.com"
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+ diff --git a/kex.c b/kex.c
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| |
+ index aa5e792d..d478ff6e 100644
|
| |
+ --- a/kex.c
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+ +++ b/kex.c
|
| |
+ @@ -65,7 +65,7 @@
|
| |
+ #endif
|
| |
+
|
| |
+ /* prototype */
|
| |
+ -static int kex_choose_conf(struct ssh *);
|
| |
+ +static int kex_choose_conf(struct ssh *, uint32_t seq);
|
| |
+ static int kex_input_newkeys(int, u_int32_t, struct ssh *);
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+
|
| |
+ static const char *proposal_names[PROPOSAL_MAX] = {
|
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+ @@ -177,6 +177,18 @@ kex_names_valid(const char *names)
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+ return 1;
|
| |
+ }
|
| |
+
|
| |
+ +/* returns non-zero if proposal contains any algorithm from algs */
|
| |
+ +static int
|
| |
+ +has_any_alg(const char *proposal, const char *algs)
|
| |
+ +{
|
| |
+ + char *cp;
|
| |
+ +
|
| |
+ + if ((cp = match_list(proposal, algs, NULL)) == NULL)
|
| |
+ + return 0;
|
| |
+ + free(cp);
|
| |
+ + return 1;
|
| |
+ +}
|
| |
+ +
|
| |
+ /*
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| |
+ * Concatenate algorithm names, avoiding duplicates in the process.
|
| |
+ * Caller must free returned string.
|
| |
+ @@ -184,7 +196,7 @@ kex_names_valid(const char *names)
|
| |
+ char *
|
| |
+ kex_names_cat(const char *a, const char *b)
|
| |
+ {
|
| |
+ - char *ret = NULL, *tmp = NULL, *cp, *p, *m;
|
| |
+ + char *ret = NULL, *tmp = NULL, *cp, *p;
|
| |
+ size_t len;
|
| |
+
|
| |
+ if (a == NULL || *a == '\0')
|
| |
+ @@ -201,10 +213,8 @@ kex_names_cat(const char *a, const char *b)
|
| |
+ }
|
| |
+ strlcpy(ret, a, len);
|
| |
+ for ((p = strsep(&cp, ",")); p && *p != '\0'; (p = strsep(&cp, ","))) {
|
| |
+ - if ((m = match_list(ret, p, NULL)) != NULL) {
|
| |
+ - free(m);
|
| |
+ + if (has_any_alg(ret, p))
|
| |
+ continue; /* Algorithm already present */
|
| |
+ - }
|
| |
+ if (strlcat(ret, ",", len) >= len ||
|
| |
+ strlcat(ret, p, len) >= len) {
|
| |
+ free(tmp);
|
| |
+ @@ -466,7 +485,12 @@ kex_protocol_error(int type, u_int32_t seq, struct ssh *ssh)
|
| |
+ {
|
| |
+ int r;
|
| |
+
|
| |
+ - error("kex protocol error: type %d seq %u", type, seq);
|
| |
+ + /* If in strict mode, any unexpected message is an error */
|
| |
+ + if ((ssh->kex->flags & KEX_INITIAL) && ssh->kex->kex_strict) {
|
| |
+ + ssh_packet_disconnect(ssh, "strict KEX violation: "
|
| |
+ + "unexpected packet type %u (seqnr %u)", type, seq);
|
| |
+ + }
|
| |
+ + error_f("type %u seq %u", type, seq);
|
| |
+ if ((r = sshpkt_start(ssh, SSH2_MSG_UNIMPLEMENTED)) != 0 ||
|
| |
+ (r = sshpkt_put_u32(ssh, seq)) != 0 ||
|
| |
+ (r = sshpkt_send(ssh)) != 0)
|
| |
+ @@ -548,6 +572,11 @@ kex_input_ext_info(int type, u_int32_t seq, struct ssh *ssh)
|
| |
+ ssh_dispatch_set(ssh, SSH2_MSG_EXT_INFO, &kex_protocol_error);
|
| |
+ if ((r = sshpkt_get_u32(ssh, &ninfo)) != 0)
|
| |
+ return r;
|
| |
+ + if (ninfo >= 1024) {
|
| |
+ + error("SSH2_MSG_EXT_INFO with too many entries, expected "
|
| |
+ + "<=1024, received %u", ninfo);
|
| |
+ + return dispatch_protocol_error(type, seq, ssh);
|
| |
+ + }
|
| |
+ for (i = 0; i < ninfo; i++) {
|
| |
+ if ((r = sshpkt_get_cstring(ssh, &name, NULL)) != 0)
|
| |
+ return r;
|
| |
+ @@ -681,7 +705,7 @@ kex_input_kexinit(int type, u_int32_t seq, struct ssh *ssh)
|
| |
+ error_f("no kex");
|
| |
+ return SSH_ERR_INTERNAL_ERROR;
|
| |
+ }
|
| |
+ - ssh_dispatch_set(ssh, SSH2_MSG_KEXINIT, NULL);
|
| |
+ + ssh_dispatch_set(ssh, SSH2_MSG_KEXINIT, &kex_protocol_error);
|
| |
+ ptr = sshpkt_ptr(ssh, &dlen);
|
| |
+ if ((r = sshbuf_put(kex->peer, ptr, dlen)) != 0)
|
| |
+ return r;
|
| |
+ @@ -717,7 +741,7 @@ kex_input_kexinit(int type, u_int32_t seq, struct ssh *ssh)
|
| |
+ if (!(kex->flags & KEX_INIT_SENT))
|
| |
+ if ((r = kex_send_kexinit(ssh)) != 0)
|
| |
+ return r;
|
| |
+ - if ((r = kex_choose_conf(ssh)) != 0)
|
| |
+ + if ((r = kex_choose_conf(ssh, seq)) != 0)
|
| |
+ return r;
|
| |
+
|
| |
+ if (kex->kex_type < KEX_MAX && kex->kex[kex->kex_type] != NULL)
|
| |
+ @@ -981,20 +1005,14 @@ proposals_match(char *my[PROPOSAL_MAX], char *peer[PROPOSAL_MAX])
|
| |
+ return (1);
|
| |
+ }
|
| |
+
|
| |
+ -/* returns non-zero if proposal contains any algorithm from algs */
|
| |
+ static int
|
| |
+ -has_any_alg(const char *proposal, const char *algs)
|
| |
+ +kexalgs_contains(char **peer, const char *ext)
|
| |
+ {
|
| |
+ - char *cp;
|
| |
+ -
|
| |
+ - if ((cp = match_list(proposal, algs, NULL)) == NULL)
|
| |
+ - return 0;
|
| |
+ - free(cp);
|
| |
+ - return 1;
|
| |
+ + return has_any_alg(peer[PROPOSAL_KEX_ALGS], ext);
|
| |
+ }
|
| |
+
|
| |
+ static int
|
| |
+ -kex_choose_conf(struct ssh *ssh)
|
| |
+ +kex_choose_conf(struct ssh *ssh, uint32_t seq)
|
| |
+ {
|
| |
+ struct kex *kex = ssh->kex;
|
| |
+ struct newkeys *newkeys;
|
| |
+ @@ -1019,13 +1037,23 @@ kex_choose_conf(struct ssh *ssh)
|
| |
+ sprop=peer;
|
| |
+ }
|
| |
+
|
| |
+ - /* Check whether client supports ext_info_c */
|
| |
+ - if (kex->server && (kex->flags & KEX_INITIAL)) {
|
| |
+ - char *ext;
|
| |
+ -
|
| |
+ - ext = match_list("ext-info-c", peer[PROPOSAL_KEX_ALGS], NULL);
|
| |
+ - kex->ext_info_c = (ext != NULL);
|
| |
+ - free(ext);
|
| |
+ + /* Check whether peer supports ext_info/kex_strict */
|
| |
+ + if ((kex->flags & KEX_INITIAL) != 0) {
|
| |
+ + if (kex->server) {
|
| |
+ + kex->ext_info_c = kexalgs_contains(peer, "ext-info-c");
|
| |
+ + kex->kex_strict = kexalgs_contains(peer,
|
| |
+ + "kex-strict-c-v00@openssh.com");
|
| |
+ + } else {
|
| |
+ + kex->kex_strict = kexalgs_contains(peer,
|
| |
+ + "kex-strict-s-v00@openssh.com");
|
| |
+ + }
|
| |
+ + if (kex->kex_strict) {
|
| |
+ + debug3_f("will use strict KEX ordering");
|
| |
+ + if (seq != 0)
|
| |
+ + ssh_packet_disconnect(ssh,
|
| |
+ + "strict KEX violation: "
|
| |
+ + "KEXINIT was not the first packet");
|
| |
+ + }
|
| |
+ }
|
| |
+
|
| |
+ /* Check whether client supports rsa-sha2 algorithms */
|
| |
+ diff --git a/kex.h b/kex.h
|
| |
+ index 5f7ef784..272ebb43 100644
|
| |
+ --- a/kex.h
|
| |
+ +++ b/kex.h
|
| |
+ @@ -149,6 +149,7 @@ struct kex {
|
| |
+ u_int kex_type;
|
| |
+ char *server_sig_algs;
|
| |
+ int ext_info_c;
|
| |
+ + int kex_strict;
|
| |
+ struct sshbuf *my;
|
| |
+ struct sshbuf *peer;
|
| |
+ struct sshbuf *client_version;
|
| |
+ diff --git a/packet.c b/packet.c
|
| |
+ index 52017def..beb214f9 100644
|
| |
+ --- a/packet.c
|
| |
+ +++ b/packet.c
|
| |
+ @@ -1207,8 +1207,13 @@ ssh_packet_send2_wrapped(struct ssh *ssh)
|
| |
+ sshbuf_dump(state->output, stderr);
|
| |
+ #endif
|
| |
+ /* increment sequence number for outgoing packets */
|
| |
+ - if (++state->p_send.seqnr == 0)
|
| |
+ + if (++state->p_send.seqnr == 0) {
|
| |
+ + if ((ssh->kex->flags & KEX_INITIAL) != 0) {
|
| |
+ + ssh_packet_disconnect(ssh, "outgoing sequence number "
|
| |
+ + "wrapped during initial key exchange");
|
| |
+ + }
|
| |
+ logit("outgoing seqnr wraps around");
|
| |
+ + }
|
| |
+ if (++state->p_send.packets == 0)
|
| |
+ if (!(ssh->compat & SSH_BUG_NOREKEY))
|
| |
+ return SSH_ERR_NEED_REKEY;
|
| |
+ @@ -1216,6 +1221,11 @@ ssh_packet_send2_wrapped(struct ssh *ssh)
|
| |
+ state->p_send.bytes += len;
|
| |
+ sshbuf_reset(state->outgoing_packet);
|
| |
+
|
| |
+ + if (type == SSH2_MSG_NEWKEYS && ssh->kex->kex_strict) {
|
| |
+ + debug_f("resetting send seqnr %u", state->p_send.seqnr);
|
| |
+ + state->p_send.seqnr = 0;
|
| |
+ + }
|
| |
+ +
|
| |
+ if (type == SSH2_MSG_NEWKEYS)
|
| |
+ r = ssh_set_newkeys(ssh, MODE_OUT);
|
| |
+ else if (type == SSH2_MSG_USERAUTH_SUCCESS && state->server_side)
|
| |
+ @@ -1344,8 +1354,7 @@ ssh_packet_read_seqnr(struct ssh *ssh, u_char *typep, u_int32_t *seqnr_p)
|
| |
+ /* Stay in the loop until we have received a complete packet. */
|
| |
+ for (;;) {
|
| |
+ /* Try to read a packet from the buffer. */
|
| |
+ - r = ssh_packet_read_poll_seqnr(ssh, typep, seqnr_p);
|
| |
+ - if (r != 0)
|
| |
+ + if ((r = ssh_packet_read_poll_seqnr(ssh, typep, seqnr_p)) != 0)
|
| |
+ break;
|
| |
+ /* If we got a packet, return it. */
|
| |
+ if (*typep != SSH_MSG_NONE)
|
| |
+ @@ -1629,10 +1615,16 @@ ssh_packet_read_poll2(struct ssh *ssh, u_char *typep, u_int32_t *seqnr_p)
|
| |
+ if ((r = sshbuf_consume(state->input, mac->mac_len)) != 0)
|
| |
+ goto out;
|
| |
+ }
|
| |
+ +
|
| |
+ if (seqnr_p != NULL)
|
| |
+ *seqnr_p = state->p_read.seqnr;
|
| |
+ - if (++state->p_read.seqnr == 0)
|
| |
+ + if (++state->p_read.seqnr == 0) {
|
| |
+ + if ((ssh->kex->flags & KEX_INITIAL) != 0) {
|
| |
+ + ssh_packet_disconnect(ssh, "incoming sequence number "
|
| |
+ + "wrapped during initial key exchange");
|
| |
+ + }
|
| |
+ logit("incoming seqnr wraps around");
|
| |
+ + }
|
| |
+ if (++state->p_read.packets == 0)
|
| |
+ if (!(ssh->compat & SSH_BUG_NOREKEY))
|
| |
+ return SSH_ERR_NEED_REKEY;
|
| |
+ @@ -1698,6 +1690,10 @@ ssh_packet_read_poll2(struct ssh *ssh, u_char *typep, u_int32_t *seqnr_p)
|
| |
+ #endif
|
| |
+ /* reset for next packet */
|
| |
+ state->packlen = 0;
|
| |
+ + if (*typep == SSH2_MSG_NEWKEYS && ssh->kex->kex_strict) {
|
| |
+ + debug_f("resetting read seqnr %u", state->p_read.seqnr);
|
| |
+ + state->p_read.seqnr = 0;
|
| |
+ + }
|
| |
+
|
| |
+ if ((r = ssh_packet_check_rekey(ssh)) != 0)
|
| |
+ return r;
|
| |
+ @@ -1720,10 +1716,39 @@ ssh_packet_read_poll_seqnr(struct ssh *ssh, u_char *typep, u_int32_t *seqnr_p)
|
| |
+ r = ssh_packet_read_poll2(ssh, typep, seqnr_p);
|
| |
+ if (r != 0)
|
| |
+ return r;
|
| |
+ - if (*typep) {
|
| |
+ - state->keep_alive_timeouts = 0;
|
| |
+ - DBG(debug("received packet type %d", *typep));
|
| |
+ + if (*typep == 0) {
|
| |
+ + /* no message ready */
|
| |
+ + return 0;
|
| |
+ }
|
| |
+ + state->keep_alive_timeouts = 0;
|
| |
+ + DBG(debug("received packet type %d", *typep));
|
| |
+ +
|
| |
+ + /* Always process disconnect messages */
|
| |
+ + if (*typep == SSH2_MSG_DISCONNECT) {
|
| |
+ + if ((r = sshpkt_get_u32(ssh, &reason)) != 0 ||
|
| |
+ + (r = sshpkt_get_string(ssh, &msg, NULL)) != 0)
|
| |
+ + return r;
|
| |
+ + /* Ignore normal client exit notifications */
|
| |
+ + do_log2(ssh->state->server_side &&
|
| |
+ + reason == SSH2_DISCONNECT_BY_APPLICATION ?
|
| |
+ + SYSLOG_LEVEL_INFO : SYSLOG_LEVEL_ERROR,
|
| |
+ + "Received disconnect from %s port %d:"
|
| |
+ + "%u: %.400s", ssh_remote_ipaddr(ssh),
|
| |
+ + ssh_remote_port(ssh), reason, msg);
|
| |
+ + free(msg);
|
| |
+ + return SSH_ERR_DISCONNECTED;
|
| |
+ + }
|
| |
+ +
|
| |
+ + /*
|
| |
+ + * Do not implicitly handle any messages here during initial
|
| |
+ + * KEX when in strict mode. They will be need to be allowed
|
| |
+ + * explicitly by the KEX dispatch table or they will generate
|
| |
+ + * protocol errors.
|
| |
+ + */
|
| |
+ + if (ssh->kex != NULL &&
|
| |
+ + (ssh->kex->flags & KEX_INITIAL) && ssh->kex->kex_strict)
|
| |
+ + return 0;
|
| |
+ + /* Implicitly handle transport-level messages */
|
| |
+ switch (*typep) {
|
| |
+ case SSH2_MSG_IGNORE:
|
| |
+ debug3("Received SSH2_MSG_IGNORE");
|
| |
+ @@ -1738,19 +1763,6 @@ ssh_packet_read_poll_seqnr(struct ssh *ssh, u_char *typep, u_int32_t *seqnr_p)
|
| |
+ debug("Remote: %.900s", msg);
|
| |
+ free(msg);
|
| |
+ break;
|
| |
+ - case SSH2_MSG_DISCONNECT:
|
| |
+ - if ((r = sshpkt_get_u32(ssh, &reason)) != 0 ||
|
| |
+ - (r = sshpkt_get_string(ssh, &msg, NULL)) != 0)
|
| |
+ - return r;
|
| |
+ - /* Ignore normal client exit notifications */
|
| |
+ - do_log2(ssh->state->server_side &&
|
| |
+ - reason == SSH2_DISCONNECT_BY_APPLICATION ?
|
| |
+ - SYSLOG_LEVEL_INFO : SYSLOG_LEVEL_ERROR,
|
| |
+ - "Received disconnect from %s port %d:"
|
| |
+ - "%u: %.400s", ssh_remote_ipaddr(ssh),
|
| |
+ - ssh_remote_port(ssh), reason, msg);
|
| |
+ - free(msg);
|
| |
+ - return SSH_ERR_DISCONNECTED;
|
| |
+ case SSH2_MSG_UNIMPLEMENTED:
|
| |
+ if ((r = sshpkt_get_u32(ssh, &seqnr)) != 0)
|
| |
+ return r;
|
| |
+ @@ -2242,6 +2254,7 @@ kex_to_blob(struct sshbuf *m, struct kex *kex)
|
| |
+ (r = sshbuf_put_u32(m, kex->hostkey_type)) != 0 ||
|
| |
+ (r = sshbuf_put_u32(m, kex->hostkey_nid)) != 0 ||
|
| |
+ (r = sshbuf_put_u32(m, kex->kex_type)) != 0 ||
|
| |
+ + (r = sshbuf_put_u32(m, kex->kex_strict)) != 0 ||
|
| |
+ (r = sshbuf_put_stringb(m, kex->my)) != 0 ||
|
| |
+ (r = sshbuf_put_stringb(m, kex->peer)) != 0 ||
|
| |
+ (r = sshbuf_put_stringb(m, kex->client_version)) != 0 ||
|
| |
+ @@ -2404,6 +2417,7 @@ kex_from_blob(struct sshbuf *m, struct kex **kexp)
|
| |
+ (r = sshbuf_get_u32(m, (u_int *)&kex->hostkey_type)) != 0 ||
|
| |
+ (r = sshbuf_get_u32(m, (u_int *)&kex->hostkey_nid)) != 0 ||
|
| |
+ (r = sshbuf_get_u32(m, &kex->kex_type)) != 0 ||
|
| |
+ + (r = sshbuf_get_u32(m, &kex->kex_strict)) != 0 ||
|
| |
+ (r = sshbuf_get_stringb(m, kex->my)) != 0 ||
|
| |
+ (r = sshbuf_get_stringb(m, kex->peer)) != 0 ||
|
| |
+ (r = sshbuf_get_stringb(m, kex->client_version)) != 0 ||
|
| |
+ @@ -2732,6 +2746,7 @@ sshpkt_disconnect(struct ssh *ssh, const char *fmt,...)
|
| |
+ vsnprintf(buf, sizeof(buf), fmt, args);
|
| |
+ va_end(args);
|
| |
+
|
| |
+ + debug2_f("sending SSH2_MSG_DISCONNECT: %s", buf);
|
| |
+ if ((r = sshpkt_start(ssh, SSH2_MSG_DISCONNECT)) != 0 ||
|
| |
+ (r = sshpkt_put_u32(ssh, SSH2_DISCONNECT_PROTOCOL_ERROR)) != 0 ||
|
| |
+ (r = sshpkt_put_cstring(ssh, buf)) != 0 ||
|
| |
+ diff --git a/sshconnect2.c b/sshconnect2.c
|
| |
+ index df6caf81..0cccbcc4 100644
|
| |
+ --- a/sshconnect2.c
|
| |
+ +++ b/sshconnect2.c
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+ @@ -253,7 +253,8 @@ ssh_kex2(struct ssh *ssh, char *host, st
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| |
+ fatal_fr(r, "kex_assemble_namelist");
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+ free(all_key);
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+
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+ - if ((s = kex_names_cat(options.kex_algorithms, "ext-info-c")) == NULL)
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+ + if ((s = kex_names_cat(options.kex_algorithms,
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+ + "ext-info-c,kex-strict-c-v00@openssh.com")) == NULL)
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+ fatal_f("kex_names_cat");
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+ myproposal[PROPOSAL_KEX_ALGS] = prop_kex = compat_kex_proposal(ssh, s);
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+ myproposal[PROPOSAL_ENC_ALGS_CTOS] =
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+ @@ -358,7 +358,6 @@ struct cauthmethod {
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| |
+ };
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+
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| |
+ static int input_userauth_service_accept(int, u_int32_t, struct ssh *);
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+ -static int input_userauth_ext_info(int, u_int32_t, struct ssh *);
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+ static int input_userauth_success(int, u_int32_t, struct ssh *);
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| |
+ static int input_userauth_failure(int, u_int32_t, struct ssh *);
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| |
+ static int input_userauth_banner(int, u_int32_t, struct ssh *);
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| |
+ @@ -472,7 +471,7 @@ ssh_userauth2(struct ssh *ssh, const char *local_user,
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+
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| |
+ ssh->authctxt = &authctxt;
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| |
+ ssh_dispatch_init(ssh, &input_userauth_error);
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| |
+ - ssh_dispatch_set(ssh, SSH2_MSG_EXT_INFO, &input_userauth_ext_info);
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+ + ssh_dispatch_set(ssh, SSH2_MSG_EXT_INFO, kex_input_ext_info);
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| |
+ ssh_dispatch_set(ssh, SSH2_MSG_SERVICE_ACCEPT, &input_userauth_service_accept);
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| |
+ ssh_dispatch_run_fatal(ssh, DISPATCH_BLOCK, &authctxt.success); /* loop until success */
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| |
+ pubkey_cleanup(ssh);
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| |
+ @@ -531,12 +530,6 @@ input_userauth_service_accept(int type, u_int32_t seq, struct ssh *ssh)
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| |
+ }
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| |
+
|
| |
+ /* ARGSUSED */
|
| |
+ -static int
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| |
+ -input_userauth_ext_info(int type, u_int32_t seqnr, struct ssh *ssh)
|
| |
+ -{
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| |
+ - return kex_input_ext_info(type, seqnr, ssh);
|
| |
+ -}
|
| |
+ -
|
| |
+ void
|
| |
+ userauth(struct ssh *ssh, char *authlist)
|
| |
+ {
|
| |
+ @@ -615,6 +608,7 @@ input_userauth_success(int type, u_int32_t seq, struct ssh *ssh)
|
| |
+ free(authctxt->methoddata);
|
| |
+ authctxt->methoddata = NULL;
|
| |
+ authctxt->success = 1; /* break out */
|
| |
+ + ssh_dispatch_set(ssh, SSH2_MSG_EXT_INFO, dispatch_protocol_error);
|
| |
+ return 0;
|
| |
+ }
|
| |
+
|
| |
+ diff -up openssh-8.7p1/sshd.c.kexstrict openssh-8.7p1/sshd.c
|
| |
+ --- openssh-8.7p1/sshd.c.kexstrict 2023-11-27 13:19:18.855433602 +0100
|
| |
+ +++ openssh-8.7p1/sshd.c 2023-11-27 13:28:10.441325314 +0100
|
| |
+ @@ -2531,10 +2531,14 @@ do_ssh2_kex(struct ssh *ssh)
|
| |
+ struct kex *kex;
|
| |
+ char *hostkey_types = NULL;
|
| |
+ char *prop_kex = NULL, *prop_enc = NULL, *prop_hostkey = NULL;
|
| |
+ + char *cp;
|
| |
+ int r;
|
| |
+
|
| |
+ - myproposal[PROPOSAL_KEX_ALGS] = prop_kex = compat_kex_proposal(ssh,
|
| |
+ - options.kex_algorithms);
|
| |
+ + if ((cp = kex_names_cat(options.kex_algorithms,
|
| |
+ + "kex-strict-s-v00@openssh.com")) == NULL)
|
| |
+ + fatal_f("kex_names_cat");
|
| |
+ +
|
| |
+ + myproposal[PROPOSAL_KEX_ALGS] = prop_kex = compat_kex_proposal(ssh, cp);
|
| |
+ myproposal[PROPOSAL_ENC_ALGS_CTOS] =
|
| |
+ myproposal[PROPOSAL_ENC_ALGS_STOC] = prop_enc =
|
| |
+ compat_cipher_proposal(ssh, options.ciphers);
|
| |
+ @@ -2586,7 +2586,7 @@ do_ssh2_kex(struct ssh *ssh)
|
| |
+ if (gss && orig)
|
| |
+ xasprintf(&newstr, "%s,%s", gss, orig);
|
| |
+ else if (gss)
|
| |
+ - newstr = gss;
|
| |
+ + xasprintf(&newstr, "%s,%s", gss, "kex-strict-s-v00@openssh.com");
|
| |
+ else if (orig)
|
| |
+ newstr = orig;
|
| |
+
|
| |
+ @@ -2650,6 +2654,7 @@ do_ssh2_kex(struct ssh *ssh)
|
| |
+ #endif
|
| |
+ free(prop_kex);
|
| |
+ free(prop_enc);
|
| |
+ + free(cp);
|
| |
+ free(prop_hostkey);
|
| |
+ debug("KEX done");
|
| |
+ }
|
| |
rcolebaugh
commented 6 months ago
src rpm scratch build: https://cbs.centos.org/koji/taskinfo?taskID=3941512