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52 lines
1.6 KiB
52 lines
1.6 KiB
7 years ago
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diff -up openssl-1.0.1e/ssl/s3_clnt.c.ecdh-downgrade openssl-1.0.1e/ssl/s3_clnt.c
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--- openssl-1.0.1e/ssl/s3_clnt.c.ecdh-downgrade 2015-01-12 16:37:49.978126895 +0100
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+++ openssl-1.0.1e/ssl/s3_clnt.c 2015-01-12 17:02:01.740959687 +0100
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@@ -1287,6 +1287,8 @@ int ssl3_get_key_exchange(SSL *s)
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int encoded_pt_len = 0;
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#endif
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+ EVP_MD_CTX_init(&md_ctx);
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+
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/* use same message size as in ssl3_get_certificate_request()
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* as ServerKeyExchange message may be skipped */
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n=s->method->ssl_get_message(s,
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@@ -1297,14 +1299,26 @@ int ssl3_get_key_exchange(SSL *s)
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&ok);
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if (!ok) return((int)n);
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+ alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
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+
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if (s->s3->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE)
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{
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+ /*
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+ * Can't skip server key exchange if this is an ephemeral
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+ * ciphersuite.
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+ */
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+ if (alg_k & (SSL_kEDH|SSL_kEECDH))
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+ {
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+ SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_UNEXPECTED_MESSAGE);
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+ al = SSL_AD_UNEXPECTED_MESSAGE;
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+ goto f_err;
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+ }
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#ifndef OPENSSL_NO_PSK
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/* In plain PSK ciphersuite, ServerKeyExchange can be
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omitted if no identity hint is sent. Set
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session->sess_cert anyway to avoid problems
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later.*/
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- if (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)
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+ if (alg_k & SSL_kPSK)
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{
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s->session->sess_cert=ssl_sess_cert_new();
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if (s->ctx->psk_identity_hint)
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@@ -1347,9 +1361,8 @@ int ssl3_get_key_exchange(SSL *s)
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}
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param_len=0;
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- alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
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+
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alg_a=s->s3->tmp.new_cipher->algorithm_auth;
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- EVP_MD_CTX_init(&md_ctx);
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#ifndef OPENSSL_NO_PSK
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if (alg_k & SSL_kPSK)
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