upstream commit

Allow RekeyLimits in excess of 4G up to 2**63 bits
 (limited by the return type of scan_scaled).  Part of bz#2521, ok djm.

Upstream-ID: 13bea82be566b9704821b1ea05bf7804335c7979

5 files changed, 22 insertions, 27 deletions

diff --git a/packet.c b/packet.c
index ffcd8eab9..f61b32b80 100644
--- a/packet.c
+++ b/packet.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: packet.c,v 1.223 2016/01/29 02:42:46 dtucker Exp $ */
+/* $OpenBSD: packet.c,v 1.224 2016/01/29 02:54:45 dtucker Exp $ */
 /*
  * Author: Tatu Ylonen <ylo@cs.hut.fi>
  * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
@@ -180,8 +180,7 @@ struct session_state {
         struct packet_state p_read, p_send;
 
         /* Volume-based rekeying */
-        u_int64_t max_blocks_in, max_blocks_out;
-        u_int32_t rekey_limit;
+        u_int64_t max_blocks_in, max_blocks_out, rekey_limit;
 
         /* Time-based rekeying */
         u_int32_t rekey_interval;       /* how often in seconds */
@@ -953,7 +952,10 @@ ssh_set_newkeys(struct ssh *ssh, int mode)
                 max_blocks = &state->max_blocks_in;
         }
         if (state->newkeys[mode] != NULL) {
-                debug("set_newkeys: rekeying");
+                debug("set_newkeys: rekeying, input %llu bytes %llu blocks, "
+                   "output %llu bytes %llu blocks",
+                   state->p_read.bytes, state->p_read.blocks,
+                   state->p_send.bytes, state->p_send.blocks);
                 if ((r = cipher_cleanup(cc)) != 0)
                         return r;
                 enc  = &state->newkeys[mode]->enc;
@@ -1021,6 +1023,7 @@ ssh_set_newkeys(struct ssh *ssh, int mode)
         if (state->rekey_limit)
                 *max_blocks = MIN(*max_blocks,
                     state->rekey_limit / enc->block_size);
+        debug("rekey after %llu blocks", *max_blocks);
         return 0;
 }
 
@@ -2271,9 +2274,9 @@ ssh_packet_need_rekeying(struct ssh *ssh)
 }
 
 void
-ssh_packet_set_rekey_limits(struct ssh *ssh, u_int32_t bytes, time_t seconds)
+ssh_packet_set_rekey_limits(struct ssh *ssh, u_int64_t bytes, time_t seconds)
 {
-        debug3("rekey after %lld bytes, %d seconds", (long long)bytes,
+        debug3("rekey after %llu bytes, %d seconds", (unsigned long long)bytes,
             (int)seconds);
         ssh->state->rekey_limit = bytes;
         ssh->state->rekey_interval = seconds;
@@ -2431,7 +2434,7 @@ ssh_packet_get_state(struct ssh *ssh, struct sshbuf *m)
                 if ((r = kex_to_blob(m, ssh->kex)) != 0 ||
                     (r = newkeys_to_blob(m, ssh, MODE_OUT)) != 0 ||
                     (r = newkeys_to_blob(m, ssh, MODE_IN)) != 0 ||
-                    (r = sshbuf_put_u32(m, state->rekey_limit)) != 0 ||
+                    (r = sshbuf_put_u64(m, state->rekey_limit)) != 0 ||
                     (r = sshbuf_put_u32(m, state->rekey_interval)) != 0 ||
                     (r = sshbuf_put_u32(m, state->p_send.seqnr)) != 0 ||
                     (r = sshbuf_put_u64(m, state->p_send.blocks)) != 0 ||
@@ -2610,7 +2613,7 @@ ssh_packet_set_state(struct ssh *ssh, struct sshbuf *m)
                 if ((r = kex_from_blob(m, &ssh->kex)) != 0 ||
                     (r = newkeys_from_blob(m, ssh, MODE_OUT)) != 0 ||
                     (r = newkeys_from_blob(m, ssh, MODE_IN)) != 0 ||
-                    (r = sshbuf_get_u32(m, &state->rekey_limit)) != 0 ||
+                    (r = sshbuf_get_u64(m, &state->rekey_limit)) != 0 ||
                     (r = sshbuf_get_u32(m, &state->rekey_interval)) != 0 ||
                     (r = sshbuf_get_u32(m, &state->p_send.seqnr)) != 0 ||
                     (r = sshbuf_get_u64(m, &state->p_send.blocks)) != 0 ||
diff --git a/packet.h b/packet.h
index c8f36eb7f..62302747d 100644
--- a/packet.h
+++ b/packet.h
@@ -1,4 +1,4 @@
-/* $OpenBSD: packet.h,v 1.68 2016/01/14 16:17:40 markus Exp $ */
+/* $OpenBSD: packet.h,v 1.69 2016/01/29 02:54:45 dtucker Exp $ */
 
 /*
  * Author: Tatu Ylonen <ylo@cs.hut.fi>
@@ -146,7 +146,7 @@ const char *ssh_remote_ipaddr(struct ssh *);
 int      ssh_remote_port(struct ssh *);
 
 int      ssh_packet_need_rekeying(struct ssh *);
-void     ssh_packet_set_rekey_limits(struct ssh *, u_int32_t, time_t);
+void     ssh_packet_set_rekey_limits(struct ssh *, u_int64_t, time_t);
 time_t   ssh_packet_get_rekey_timeout(struct ssh *);
 
 void    *ssh_packet_get_input(struct ssh *);
diff --git a/readconf.c b/readconf.c
index 8e9a25da7..2a5620479 100644
--- a/readconf.c
+++ b/readconf.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: readconf.c,v 1.248 2016/01/14 16:17:40 markus Exp $ */
+/* $OpenBSD: readconf.c,v 1.249 2016/01/29 02:54:45 dtucker Exp $ */
 /*
  * Author: Tatu Ylonen <ylo@cs.hut.fi>
  * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
@@ -976,16 +976,12 @@ parse_time:
                         if (scan_scaled(arg, &val64) == -1)
                                 fatal("%.200s line %d: Bad number '%s': %s",
                                     filename, linenum, arg, strerror(errno));
-                        /* check for too-large or too-small limits */
-                        if (val64 > UINT_MAX)
-                                fatal("%.200s line %d: RekeyLimit too large",
-                                    filename, linenum);
                         if (val64 != 0 && val64 < 16)
                                 fatal("%.200s line %d: RekeyLimit too small",
                                     filename, linenum);
                 }
                 if (*activep && options->rekey_limit == -1)
-                        options->rekey_limit = (u_int32_t)val64;
+                        options->rekey_limit = val64;
                 if (s != NULL) { /* optional rekey interval present */
                         if (strcmp(s, "none") == 0) {
                                 (void)strdelim(&s);     /* discard */
@@ -2436,8 +2432,8 @@ dump_client_config(Options *o, const char *host)
         printf("%s\n", iptos2str(o->ip_qos_bulk));
 
         /* oRekeyLimit */
-        printf("rekeylimit %lld %d\n",
-            (long long)o->rekey_limit, o->rekey_interval);
+        printf("rekeylimit %llu %d\n",
+            (unsigned long long)o->rekey_limit, o->rekey_interval);
 
         /* oStreamLocalBindMask */
         printf("streamlocalbindmask 0%o\n",
diff --git a/servconf.c b/servconf.c
index 19c68e2d7..7bee5a17a 100644
--- a/servconf.c
+++ b/servconf.c
@@ -1,5 +1,5 @@
 
-/* $OpenBSD: servconf.c,v 1.283 2015/11/13 04:38:06 djm Exp $ */
+/* $OpenBSD: servconf.c,v 1.284 2016/01/29 02:54:45 dtucker Exp $ */
 /*
  * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
  *                    All rights reserved
@@ -1330,16 +1330,12 @@ process_server_config_line(ServerOptions *options, char *line,
                         if (scan_scaled(arg, &val64) == -1)
                                 fatal("%.200s line %d: Bad number '%s': %s",
                                     filename, linenum, arg, strerror(errno));
-                        /* check for too-large or too-small limits */
-                        if (val64 > UINT_MAX)
-                                fatal("%.200s line %d: RekeyLimit too large",
-                                    filename, linenum);
                         if (val64 != 0 && val64 < 16)
                                 fatal("%.200s line %d: RekeyLimit too small",
                                     filename, linenum);
                 }
                 if (*activep && options->rekey_limit == -1)
-                        options->rekey_limit = (u_int32_t)val64;
+                        options->rekey_limit = val64;
                 if (cp != NULL) { /* optional rekey interval present */
                         if (strcmp(cp, "none") == 0) {
                                 (void)strdelim(&cp);    /* discard */
@@ -2361,7 +2357,7 @@ dump_config(ServerOptions *o)
         printf("ipqos %s ", iptos2str(o->ip_qos_interactive));
         printf("%s\n", iptos2str(o->ip_qos_bulk));
 
-        printf("rekeylimit %lld %d\n", (long long)o->rekey_limit,
+        printf("rekeylimit %llu %d\n", (unsigned long long)o->rekey_limit,
             o->rekey_interval);
 
         channel_print_adm_permitted_opens();
diff --git a/sshd.c b/sshd.c
index 7504bff6d..253004db4 100644
--- a/sshd.c
+++ b/sshd.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: sshd.c,v 1.463 2016/01/14 16:17:40 markus Exp $ */
+/* $OpenBSD: sshd.c,v 1.464 2016/01/29 02:54:45 dtucker Exp $ */
 /*
  * Author: Tatu Ylonen <ylo@cs.hut.fi>
  * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
@@ -2563,7 +2563,7 @@ do_ssh2_kex(void)
         }
 
         if (options.rekey_limit || options.rekey_interval)
-                packet_set_rekey_limits((u_int32_t)options.rekey_limit,
+                packet_set_rekey_limits(options.rekey_limit,
                     (time_t)options.rekey_interval);
 
         myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = compat_pkalg_proposal(