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* According to RFC 8446, Section 4.4.4, recipients of incorrect Finishedtb2020-02-232-4/+4
| | | | | | | messages must terminate the connection with a decrypt_error alert, so replace the use of the deprecated decryption_failed alert accordingly. ok beck inoguchi jsing
* Remove the s2n macro now that it is finally unused.jsing2020-02-211-4/+1
| | | | ok inoguchi@ tb@
* Convert the SSL/TLS record creation code to CBB.jsing2020-02-211-18/+28
| | | | ok inoguchi@ tb@
* Convert the DTLS header creation code to CBB.jsing2020-02-211-20/+27
| | | | | | | Also consolidate it into the one place, since there is no reason to write the epoch and sequence out later. ok inoguchi@ tb@
* Remove some commented code, remove some pointless comments and move somejsing2020-02-211-17/+6
| | | | | | comments to their correct places. ok inoguchi@ tb@
* Convert dtls1_build_sequence_number() to CBB.jsing2020-02-211-7/+15
| | | | ok inoguchi@ tb@
* Move l2n/l2n8 into s3_cbc.c, since this is the only code that uses it.jsing2020-02-212-16/+16
| | | | ok inoguchi@ tb@
* Remove prefix_len, since it is always zero.jsing2020-02-211-4/+3
| | | | ok inoguchi@ tb@
* Remove now unused variable.jsing2020-02-211-3/+1
| | | | ok inoguchi@ tb@
* Refactor do_ssl3_write().jsing2020-02-191-97/+98
| | | | | | | | | | | | | When empty fragments were added as a countermeasure against chosen plaintext attacks on CBC, it was done by adding a recursive call to do_ssl3_write(). This makes the code more complex and difficult to change. Split the record creation code into a separate ssl3_create_record() function, which do_ssl3_write() calls. In the case where an empty fragment is needed, ssl3_create_record() is simply called twice, removing the need for recursion. ok inoguchi@ tb@
* drop unused include <openssl/curve25519.h>tb2020-02-184-10/+4
| | | | ok inoguchi jsing
* Avoid potential NULL dereference when parsing a server keyshare extension.jsing2020-02-161-1/+4
| | | | | | | | | | | | It is currently possible for key_share to be NULL when a TLS client receives a keyshare extension. However, for this to occur the client has to be doing TLS 1.2 or earlier, which means that it was invalid for the server to send the extension. As such, check for NULL and treat it as an invalid extension. Found by oss-fuzz (#20741 and #20745). ok inoguchi@ tb@
* Avoid leak for tmp.x25519inoguchi2020-02-162-5/+11
| | | | | | | | | | Changed to use local variable to hold malloc address rather than directly set to S3I(s)->tmp.x25519, and set that private_key pointer to S3I(s)->tmp.x25519 after all the "goto err;". Also added freezero for S3I(s)->tmp.x25519 to ssl3_free() and ssl3_clear(). ok jsing@ tb@
* Move the TLSv1.3 code that interfaces with the legacy APIs/stack into ajsing2020-02-153-309/+330
| | | | | | separate file. Discussed with beck@ and tb@
* Remove #include that is not needed.jsing2020-02-151-3/+1
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* Re-enable the TLSv1.3 client since the known issues have been addressed.jsing2020-02-061-3/+1
| | | | ok tb@
* Add a workaround to make SSL_set_session() work with TLSv1.3.jsing2020-02-061-1/+9
| | | | | | | | While we do not currently do session resumption, just return the TLS_client_method() or TLS_server_method() when asked for a method that does TLSv1.3. ok tb@ (who also arrived at the same diff)
* Add support for handling hello retry requests in the TLSv1.3 client.jsing2020-02-061-5/+100
| | | | | | | | | In the case of a hello retry request, we need to replace the client hello with a synthetic handshake message, switch key share to that selected by the server, build and send a new client hello, then process the resulting server hello. ok tb@
* Correctly handle key share extensions in a hello retry request.jsing2020-02-062-4/+11
| | | | | | | | In a hello retry request the server will only send the selected group and not actually provide a key exchange. In this case we need to store the server selected group for further processing. ok tb@
* Refactor the server hello processing code in the TLSv1.3 client.jsing2020-02-052-22/+46
| | | | | | | | | | | | | Use flags to signal the need to switch to the legacy client and to identify a hello retry request. This allows the caller to take appropriate action, rather than trying to do this in the parsing/processing code. Split the key deriviation and record protection engagement code into a separate function, both for readability and reuse. Change handshake states outside of the processing code. ok tb@
* Remove the hello retry request processing code that was previously added.jsing2020-02-052-65/+16
| | | | | | | This got added to the wrong functions (server side, not client) - swap the now unimplemented send/recv functions between client and server. ok tb@
* Provide tls1_transcript_unfreeze() to avoid the need for manual flagsjsing2020-02-052-3/+10
| | | | | | mangling. ok tb@
* Pull the handshake message transcript code into its own function.jsing2020-02-052-7/+14
| | | | | | This is soon going to be used in the TLSv1.3 client code. ok tb@
* Rework tls13_legacy_handshake_message_{recv,sent}_cb() to usetb2020-02-053-16/+22
| | | | | | their own CBS as a preparation for upcoming HRR diffs. ok jsing
* Add support for TLSv1.3 key shares with secp256r1 and secp384r1 groups.jsing2020-02-041-5/+98
| | | | ok inoguchi@ tb@
* Free the transcript as soon as we initialise the transcript hash.jsing2020-02-042-2/+4
| | | | | | | | Unlike TLSv1.2 there is only a single hash in use, hence as soon as we know what the hash is and have initialised the transcript hash, we can free the transcript buffers. ok inoguchi@ tb@
* Correctly unpack client key shares.jsing2020-02-012-14/+11
| | | | | | | | Even if we're not processing/using the peer public key from the key share, we still need to unpack it in order to parse the TLS extension correctly. Resolves issues with TLSv1.3 clients talking to TLSv1.2 server. ok tb@
* Disable TLSv1.3 client while some known issues are being addressed.jsing2020-02-011-1/+3
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* Provide struct/functions for handling TLSv1.3 key shares.jsing2020-01-308-130/+299
| | | | | | | Pull out the key share handling code and provide a clean/self contained interface. This will make it easier to support groups other than X25519. ok beck@ inoguchi@ tb@
* Factor out/rewrite the ECDHE EC point key exchange code.jsing2020-01-305-173/+188
| | | | | | | | | This reduces replication between the existing TLS client/server and allows the code to soon be reused for TLSv1.3. With feedback from inoguchi@ and tb@ ok inoguchi@ tb@
* Remove dead prototypes.jsing2020-01-291-10/+1
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* If the TLSv1.3 code has not recorded an error and something already existsjsing2020-01-293-3/+9
| | | | | | | | on the error stack, refrain from pushing an 'unknown' error on the stack. This should allow libcrypto errors (including bio) to be visible, where we have nothing better to offer. ok tb@
* Remove unused stub implementation of tls13_accept(). The correcttb2020-01-291-11/+1
| | | | | | and used version is in tls13_server.c. ok inoguchi jsing
* Fix SSL_CIPHER_descriptioninoguchi2020-01-261-2/+2
| | | | ok jsing@
* When an SSL method is set, bump the max version back to that of thejsing2020-01-261-1/+10
| | | | | | | | | | incoming method if it is a client. This addresses the case where TLS_method() is used to initialise a SSL_CTX, then a TLS_client_method() is then set, resulting in TLSv1.2 being used instead of TLSv1.3. This is observable in smtpd. ok beck@
* When switching back to a legacy client or server, ensure we reset thejsing2020-01-262-2/+4
| | | | | | | | handshake function pointer. Fixes an isssue found by jca@ with OpenVPN. ok beck@ tb@
* Fix basement bug where record layer would not correctly deal withbeck2020-01-261-1/+4
| | | | | | traffic retries when not yet encrypting. ok jsing@
* Add server side support for requesting client certificates in tls 1.3beck2020-01-261-4/+173
| | | | ok jsing@
* Add client certificate support for tls 1.3beck2020-01-262-15/+149
| | | | ok jsing@
* Add sigalgs for server side to enable client certificate processingbeck2020-01-261-5/+34
| | | | | | | | in tls 1.3 Will be used in a follow on commit to enable tls1.3 client certificates ok jsing@
* Move pad and verify context into tls13_lib.cbeck2020-01-264-68/+60
| | | | ok jsing@
* Add an underbar for consistency.tb2020-01-251-2/+2
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* Revert change to certificate request check from r1.45.jsing2020-01-251-3/+3
| | | | | | This code was correct, it was the entry in the table that was incorrect. ok beck@
* Only perform the downgrade check if our max version is less than TLSv1.3.jsing2020-01-251-15/+17
| | | | | | | Issue noticed by kn@ when talking to a TLSv1.3 capable mail server, but with smtpd capping max version to TLSv1.2. ok beck@
* Preserve the transcript hash for the client finished message,beck2020-01-251-2/+3
| | | | | | and correct the message type for certificate request. ok jsing@
* Support legacy message callbacks. First step for SSL_set_msg_callback(3)tb2020-01-253-3/+40
| | | | | | support. Makes openssl s_client -msg work for handshake messages. ok beck jsing
* Correct value for SSL_TLSEXT_MSG_HRR.jsing2020-01-251-2/+2
| | | | ok beck@ tb@
* Only discard the extension block for client hello and server hellojsing2020-01-251-2/+3
| | | | | | | | | messages. TLSv1.3 messages that include extensions need a length prefixed field with zero bytes, rather than no data at all. ok beck@ tb@
* Only send an RI extension for pre-TLSv1.3 versions.jsing2020-01-251-2/+2
| | | | ok beck@
* It is possible to receive a pre-TLSv1.3 alert in response to a TLSv1.3jsing2020-01-253-4/+24
| | | | | | | | | | | | client hello. Allow pre-TLSv1.3 alerts (including warnings) to be received before the server hello message. Disallow pre-TLSv1.3 alerts as soon as we know that we are using TLSv1.3. Noticed by ajacoutot@ while connecting to www.openprinting.org. ok tb@
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