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https://github.com/openwrt/openwrt.git
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902961c148
Update wolfssl to the latest release v3.12.2 and backport an upstream
pending fix for CVE-2017-13099 ("ROBOT vulnerability").
Ref: https://github.com/wolfSSL/wolfssl/pull/1229
Ref: https://robotattack.org/
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
145 lines
6.5 KiB
Diff
145 lines
6.5 KiB
Diff
From fd455d5a5e9fef24c208e7ac7d3a4bc58834cbf1 Mon Sep 17 00:00:00 2001
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From: David Garske <david@wolfssl.com>
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Date: Tue, 14 Nov 2017 14:05:50 -0800
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Subject: [PATCH] Fix for handling of static RSA PKCS formatting failures so
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they are indistinguishable from from correctly formatted RSA blocks (per
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RFC5246 section 7.4.7.1). Adjusted the static RSA preMasterSecret RNG
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creation for consistency in client case. Removed obsolete
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`PMS_VERSION_ERROR`.
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---
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src/internal.c | 70 +++++++++++++++++++++++++++++++++++++++++++++--------
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wolfssl/error-ssl.h | 2 +-
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2 files changed, 61 insertions(+), 11 deletions(-)
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--- a/src/internal.c
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+++ b/src/internal.c
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@@ -14190,9 +14190,6 @@ const char* wolfSSL_ERR_reason_error_str
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case NOT_READY_ERROR :
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return "handshake layer not ready yet, complete first";
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- case PMS_VERSION_ERROR :
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- return "premaster secret version mismatch error";
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-
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case VERSION_ERROR :
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return "record layer version error";
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@@ -18758,8 +18755,10 @@ int SendClientKeyExchange(WOLFSSL* ssl)
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#ifndef NO_RSA
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case rsa_kea:
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{
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+ /* build PreMasterSecret with RNG data */
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ret = wc_RNG_GenerateBlock(ssl->rng,
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- ssl->arrays->preMasterSecret, SECRET_LEN);
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+ &ssl->arrays->preMasterSecret[VERSION_SZ],
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+ SECRET_LEN - VERSION_SZ);
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if (ret != 0) {
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goto exit_scke;
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}
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@@ -23545,6 +23544,9 @@ static int DoSessionTicket(WOLFSSL* ssl,
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word32 idx;
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word32 begin;
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word32 sigSz;
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+ #ifndef NO_RSA
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+ int lastErr;
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+ #endif
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} DckeArgs;
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static void FreeDckeArgs(WOLFSSL* ssl, void* pArgs)
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@@ -23770,6 +23772,14 @@ static int DoSessionTicket(WOLFSSL* ssl,
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ERROR_OUT(BUFFER_ERROR, exit_dcke);
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}
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+ /* pre-load PreMasterSecret with RNG data */
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+ ret = wc_RNG_GenerateBlock(ssl->rng,
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+ &ssl->arrays->preMasterSecret[VERSION_SZ],
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+ SECRET_LEN - VERSION_SZ);
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+ if (ret != 0) {
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+ goto exit_dcke;
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+ }
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+
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args->output = NULL;
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break;
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} /* rsa_kea */
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@@ -24234,6 +24244,20 @@ static int DoSessionTicket(WOLFSSL* ssl,
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NULL, 0, NULL
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#endif
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);
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+
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+ /* Errors that can occur here that should be
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+ * indistinguishable:
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+ * RSA_BUFFER_E, RSA_PAD_E and RSA_PRIVATE_ERROR
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+ */
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+ if (ret < 0 && ret != BAD_FUNC_ARG) {
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+ #ifdef WOLFSSL_ASYNC_CRYPT
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+ if (ret == WC_PENDING_E)
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+ goto exit_dcke;
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+ #endif
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+ /* store error code for handling below */
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+ args->lastErr = ret;
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+ ret = 0;
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+ }
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break;
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} /* rsa_kea */
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#endif /* !NO_RSA */
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@@ -24380,16 +24404,42 @@ static int DoSessionTicket(WOLFSSL* ssl,
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/* Add the signature length to idx */
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args->idx += args->length;
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- if (args->sigSz == SECRET_LEN && args->output != NULL) {
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- XMEMCPY(ssl->arrays->preMasterSecret, args->output, SECRET_LEN);
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- if (ssl->arrays->preMasterSecret[0] != ssl->chVersion.major ||
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- ssl->arrays->preMasterSecret[1] != ssl->chVersion.minor) {
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- ERROR_OUT(PMS_VERSION_ERROR, exit_dcke);
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+ #ifdef DEBUG_WOLFSSL
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+ /* check version (debug warning message only) */
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+ if (args->output != NULL) {
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+ if (args->output[0] != ssl->chVersion.major ||
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+ args->output[1] != ssl->chVersion.minor) {
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+ WOLFSSL_MSG("preMasterSecret version mismatch");
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}
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}
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+ #endif
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+
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+ /* RFC5246 7.4.7.1:
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+ * Treat incorrectly formatted message blocks and/or
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+ * mismatched version numbers in a manner
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+ * indistinguishable from correctly formatted RSA blocks
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+ */
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+
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+ ret = args->lastErr;
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+ args->lastErr = 0; /* reset */
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+
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+ /* build PreMasterSecret */
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+ ssl->arrays->preMasterSecret[0] = ssl->chVersion.major;
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+ ssl->arrays->preMasterSecret[1] = ssl->chVersion.minor;
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+ if (ret == 0 && args->sigSz == SECRET_LEN &&
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+ args->output != NULL) {
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+ XMEMCPY(&ssl->arrays->preMasterSecret[VERSION_SZ],
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+ &args->output[VERSION_SZ],
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+ SECRET_LEN - VERSION_SZ);
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+ }
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else {
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- ERROR_OUT(RSA_PRIVATE_ERROR, exit_dcke);
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+ /* preMasterSecret has RNG and version set */
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+ /* return proper length and ignore error */
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+ /* error will be caught as decryption error */
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+ args->sigSz = SECRET_LEN;
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+ ret = 0;
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}
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+
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break;
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} /* rsa_kea */
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#endif /* !NO_RSA */
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--- a/wolfssl/error-ssl.h
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+++ b/wolfssl/error-ssl.h
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@@ -57,7 +57,7 @@ enum wolfSSL_ErrorCodes {
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DOMAIN_NAME_MISMATCH = -322, /* peer subject name mismatch */
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WANT_READ = -323, /* want read, call again */
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NOT_READY_ERROR = -324, /* handshake layer not ready */
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- PMS_VERSION_ERROR = -325, /* pre m secret version error */
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+
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VERSION_ERROR = -326, /* record layer version error */
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WANT_WRITE = -327, /* want write, call again */
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BUFFER_ERROR = -328, /* malformed buffer input */
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