89 lines
2.7 KiB
Diff
89 lines
2.7 KiB
Diff
Use version in SSL_METHOD not SSL structure.
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When deciding whether to use TLS 1.2 PRF and record hash algorithms
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use the version number in the corresponding SSL_METHOD structure
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instead of the SSL structure. The SSL structure version is sometimes
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inaccurate. Note: OpenSSL 1.0.2 and later effectively do this already.
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(CVE-2013-6449)
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Also preventively check EVP errors for handshake digests.
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diff --git a/ssl/s3_lib.c b/ssl/s3_lib.c
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index bf832bb..c4ef273 100644
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--- a/ssl/s3_lib.c
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+++ b/ssl/s3_lib.c
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@@ -4286,7 +4286,7 @@ need to go to SSL_ST_ACCEPT.
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long ssl_get_algorithm2(SSL *s)
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{
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long alg2 = s->s3->tmp.new_cipher->algorithm2;
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- if (TLS1_get_version(s) >= TLS1_2_VERSION &&
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+ if (s->method->version == TLS1_2_VERSION &&
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alg2 == (SSL_HANDSHAKE_MAC_DEFAULT|TLS1_PRF))
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return SSL_HANDSHAKE_MAC_SHA256 | TLS1_PRF_SHA256;
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return alg2;
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diff --git a/ssl/s3_both.c b/ssl/s3_both.c
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index ead01c8..1e5dcab 100644
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--- a/ssl/s3_both.c
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+++ b/ssl/s3_both.c
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@@ -161,6 +161,8 @@ int ssl3_send_finished(SSL *s, int a, int b, const char *sender, int slen)
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i=s->method->ssl3_enc->final_finish_mac(s,
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sender,slen,s->s3->tmp.finish_md);
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+ if (i == 0)
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+ return 0;
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s->s3->tmp.finish_md_len = i;
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memcpy(p, s->s3->tmp.finish_md, i);
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p+=i;
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diff --git a/ssl/s3_pkt.c b/ssl/s3_pkt.c
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index 804291e..c4bc4e7 100644
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--- a/ssl/s3_pkt.c
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+++ b/ssl/s3_pkt.c
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@@ -1459,8 +1459,14 @@ int ssl3_do_change_cipher_spec(SSL *s)
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slen=s->method->ssl3_enc->client_finished_label_len;
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}
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- s->s3->tmp.peer_finish_md_len = s->method->ssl3_enc->final_finish_mac(s,
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+ i = s->method->ssl3_enc->final_finish_mac(s,
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sender,slen,s->s3->tmp.peer_finish_md);
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+ if (i == 0)
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+ {
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+ SSLerr(SSL_F_SSL3_DO_CHANGE_CIPHER_SPEC, ERR_R_INTERNAL_ERROR);
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+ return 0;
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+ }
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+ s->s3->tmp.peer_finish_md_len = i;
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return(1);
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}
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diff --git a/ssl/t1_enc.c b/ssl/t1_enc.c
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index 809ad2e..72015f5 100644
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--- a/ssl/t1_enc.c
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+++ b/ssl/t1_enc.c
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@@ -915,18 +915,19 @@ int tls1_final_finish_mac(SSL *s,
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if (mask & ssl_get_algorithm2(s))
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{
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int hashsize = EVP_MD_size(md);
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- if (hashsize < 0 || hashsize > (int)(sizeof buf - (size_t)(q-buf)))
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+ EVP_MD_CTX *hdgst = s->s3->handshake_dgst[idx];
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+ if (!hdgst || hashsize < 0 || hashsize > (int)(sizeof buf - (size_t)(q-buf)))
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{
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/* internal error: 'buf' is too small for this cipersuite! */
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err = 1;
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}
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else
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{
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- EVP_MD_CTX_copy_ex(&ctx,s->s3->handshake_dgst[idx]);
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- EVP_DigestFinal_ex(&ctx,q,&i);
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- if (i != (unsigned int)hashsize) /* can't really happen */
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+ if (!EVP_MD_CTX_copy_ex(&ctx, hdgst) ||
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+ !EVP_DigestFinal_ex(&ctx,q,&i) ||
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+ (i != (unsigned int)hashsize))
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err = 1;
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- q+=i;
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+ q+=hashsize;
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}
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}
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}
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--
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1.8.3.1
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