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Diffstat (limited to 'src/lib/libssl/ssl_lib.c')
-rw-r--r--src/lib/libssl/ssl_lib.c157
1 files changed, 1 insertions, 156 deletions
diff --git a/src/lib/libssl/ssl_lib.c b/src/lib/libssl/ssl_lib.c
index 649b238bd9..6f31d6dcdf 100644
--- a/src/lib/libssl/ssl_lib.c
+++ b/src/lib/libssl/ssl_lib.c
@@ -1,4 +1,4 @@
1/* $OpenBSD: ssl_lib.c,v 1.151 2017/01/26 00:42:44 jsing Exp $ */ 1/* $OpenBSD: ssl_lib.c,v 1.152 2017/01/26 06:01:44 jsing Exp $ */
2/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 2/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3 * All rights reserved. 3 * All rights reserved.
4 * 4 *
@@ -2492,161 +2492,6 @@ SSL_get_version(const SSL *s)
2492 return ssl_version_string(s->version); 2492 return ssl_version_string(s->version);
2493} 2493}
2494 2494
2495static int
2496ssl_clamp_version_range(uint16_t *min_ver, uint16_t *max_ver,
2497 uint16_t clamp_min, uint16_t clamp_max)
2498{
2499 if (clamp_min > clamp_max || *min_ver > *max_ver)
2500 return 0;
2501 if (clamp_max < *min_ver || clamp_min > *max_ver)
2502 return 0;
2503
2504 if (*min_ver < clamp_min)
2505 *min_ver = clamp_min;
2506 if (*max_ver > clamp_max)
2507 *max_ver = clamp_max;
2508
2509 return 1;
2510}
2511
2512int
2513ssl_enabled_version_range(SSL *s, uint16_t *min_ver, uint16_t *max_ver)
2514{
2515 uint16_t min_version, max_version;
2516
2517 /*
2518 * The enabled versions have to be a contiguous range, which means we
2519 * cannot enable and disable single versions at our whim, even though
2520 * this is what the OpenSSL flags allow. The historical way this has
2521 * been handled is by making a flag mean that all higher versions
2522 * are disabled, if any version lower than the flag is enabled.
2523 */
2524
2525 min_version = 0;
2526 max_version = TLS1_2_VERSION;
2527
2528 if ((s->internal->options & SSL_OP_NO_TLSv1) == 0)
2529 min_version = TLS1_VERSION;
2530 else if ((s->internal->options & SSL_OP_NO_TLSv1_1) == 0)
2531 min_version = TLS1_1_VERSION;
2532 else if ((s->internal->options & SSL_OP_NO_TLSv1_2) == 0)
2533 min_version = TLS1_2_VERSION;
2534
2535 if ((s->internal->options & SSL_OP_NO_TLSv1_2) && min_version < TLS1_2_VERSION)
2536 max_version = TLS1_1_VERSION;
2537 if ((s->internal->options & SSL_OP_NO_TLSv1_1) && min_version < TLS1_1_VERSION)
2538 max_version = TLS1_VERSION;
2539 if ((s->internal->options & SSL_OP_NO_TLSv1) && min_version < TLS1_VERSION)
2540 max_version = 0;
2541
2542 /* Everything has been disabled... */
2543 if (min_version == 0 || max_version == 0)
2544 return 0;
2545
2546 /* Limit to configured version range. */
2547 if (!ssl_clamp_version_range(&min_version, &max_version,
2548 s->internal->min_version, s->internal->max_version))
2549 return 0;
2550
2551 if (min_ver != NULL)
2552 *min_ver = min_version;
2553 if (max_ver != NULL)
2554 *max_ver = max_version;
2555
2556 return 1;
2557}
2558
2559int
2560ssl_supported_version_range(SSL *s, uint16_t *min_ver, uint16_t *max_ver)
2561{
2562 uint16_t min_version, max_version;
2563
2564 /* DTLS cannot currently be disabled... */
2565 if (SSL_IS_DTLS(s)) {
2566 min_version = max_version = DTLS1_VERSION;
2567 goto done;
2568 }
2569
2570 if (!ssl_enabled_version_range(s, &min_version, &max_version))
2571 return 0;
2572
2573 /* Limit to the versions supported by this method. */
2574 if (!ssl_clamp_version_range(&min_version, &max_version,
2575 s->method->internal->min_version,
2576 s->method->internal->max_version))
2577 return 0;
2578
2579 done:
2580 if (min_ver != NULL)
2581 *min_ver = min_version;
2582 if (max_ver != NULL)
2583 *max_ver = max_version;
2584
2585 return 1;
2586}
2587
2588int
2589ssl_max_shared_version(SSL *s, uint16_t peer_ver, uint16_t *max_ver)
2590{
2591 uint16_t min_version, max_version, shared_version;
2592
2593 *max_ver = 0;
2594
2595 if (SSL_IS_DTLS(s)) {
2596 if (peer_ver >= DTLS1_VERSION) {
2597 *max_ver = DTLS1_VERSION;
2598 return 1;
2599 }
2600 return 0;
2601 }
2602
2603 if (peer_ver >= TLS1_2_VERSION)
2604 shared_version = TLS1_2_VERSION;
2605 else if (peer_ver >= TLS1_1_VERSION)
2606 shared_version = TLS1_1_VERSION;
2607 else if (peer_ver >= TLS1_VERSION)
2608 shared_version = TLS1_VERSION;
2609 else
2610 return 0;
2611
2612 if (!ssl_supported_version_range(s, &min_version, &max_version))
2613 return 0;
2614
2615 if (shared_version < min_version)
2616 return 0;
2617
2618 if (shared_version > max_version)
2619 shared_version = max_version;
2620
2621 *max_ver = shared_version;
2622
2623 return 1;
2624}
2625
2626uint16_t
2627ssl_max_server_version(SSL *s)
2628{
2629 uint16_t max_version, min_version = 0;
2630
2631 if (SSL_IS_DTLS(s))
2632 return (DTLS1_VERSION);
2633
2634 if (!ssl_enabled_version_range(s, &min_version, &max_version))
2635 return 0;
2636
2637 /*
2638 * Limit to the versions supported by this method. The SSL method
2639 * will be changed during version negotiation, as such we want to
2640 * use the SSL method from the context.
2641 */
2642 if (!ssl_clamp_version_range(&min_version, &max_version,
2643 s->ctx->method->internal->min_version,
2644 s->ctx->method->internal->max_version))
2645 return 0;
2646
2647 return (max_version);
2648}
2649
2650SSL * 2495SSL *
2651SSL_dup(SSL *s) 2496SSL_dup(SSL *s)
2652{ 2497{