A local copy of OpenSSL from GitHub
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Suppress DANE TLSA reflection when verification fails As documented both SSL_get0_dane_authority() and SSL_get0_dane_tlsa() are expected to return a negative match depth and nothing else when verification fails. However, this only happened when verification failed during chain construction. Errors in verification of the constructed chain did not have the intended effect on these functions. This commit updates the functions to check for verify_result == X509_V_OK, and no longer erases any accumulated match information when chain construction fails. Sophisticated developers can, with care, use SSL_set_verify_result(ssl, X509_V_OK) to "peek" at TLSA info even when verification fail. They must of course first check and save the real error, and restore the original error as quickly as possible. Hiding by default seems to be the safer interface. Introduced X509_V_ERR_DANE_NO_MATCH code to signal failure to find matching TLSA records. Previously reported via X509_V_ERR_CERT_UNTRUSTED. This also changes the "-brief" output from s_client to include verification results and TLSA match information. Mentioned session resumption in code example in SSL_CTX_dane_enable(3). Also mentioned that depths returned are relative to the verified chain which is now available via SSL_get0_verified_chain(3). Added a few more test-cases to danetest, that exercise the new code. Resolved thread safety issue in use of static buffer in X509_verify_cert_error_string(). Fixed long-stating issue in apps/s_cb.c which always sets verify_error to either X509_V_OK or "chain to long", code elsewhere (e.g. s_time.c), seems to expect the actual error. [ The new chain construction code is expected to correctly generate "chain too long" errors, so at some point we need to drop the work-arounds, once SSL_set_verify_depth() is also fixed to propagate the depth to X509_STORE_CTX reliably. ] Reviewed-by: Rich Salz <rsalz@openssl.org>
6 years ago
Suppress DANE TLSA reflection when verification fails As documented both SSL_get0_dane_authority() and SSL_get0_dane_tlsa() are expected to return a negative match depth and nothing else when verification fails. However, this only happened when verification failed during chain construction. Errors in verification of the constructed chain did not have the intended effect on these functions. This commit updates the functions to check for verify_result == X509_V_OK, and no longer erases any accumulated match information when chain construction fails. Sophisticated developers can, with care, use SSL_set_verify_result(ssl, X509_V_OK) to "peek" at TLSA info even when verification fail. They must of course first check and save the real error, and restore the original error as quickly as possible. Hiding by default seems to be the safer interface. Introduced X509_V_ERR_DANE_NO_MATCH code to signal failure to find matching TLSA records. Previously reported via X509_V_ERR_CERT_UNTRUSTED. This also changes the "-brief" output from s_client to include verification results and TLSA match information. Mentioned session resumption in code example in SSL_CTX_dane_enable(3). Also mentioned that depths returned are relative to the verified chain which is now available via SSL_get0_verified_chain(3). Added a few more test-cases to danetest, that exercise the new code. Resolved thread safety issue in use of static buffer in X509_verify_cert_error_string(). Fixed long-stating issue in apps/s_cb.c which always sets verify_error to either X509_V_OK or "chain to long", code elsewhere (e.g. s_time.c), seems to expect the actual error. [ The new chain construction code is expected to correctly generate "chain too long" errors, so at some point we need to drop the work-arounds, once SSL_set_verify_depth() is also fixed to propagate the depth to X509_STORE_CTX reliably. ] Reviewed-by: Rich Salz <rsalz@openssl.org>
6 years ago
Add SSL_CTX early callback Provide a callback interface that gives the application the ability to adjust the nascent SSL object at the earliest stage of ClientHello processing, immediately after extensions have been collected but before they have been processed. This is akin to BoringSSL's "select_certificate_cb" (though it is not API compatible), and as the name indicates, one major use is to examine the supplied server name indication and select what certificate to present to the client. However, it can also be used to make more sweeping configuration changes to the SSL object according to the selected server identity and configuration. That may include adjusting the permitted TLS versions, swapping out the SSL_CTX object (as is traditionally done in a tlsext_servername_callback), changing the server's cipher list, and more. We also wish to allow an early callback to indicate that it needs to perform additional work asynchronously and resume processing later. To that effect, refactor the second half of tls_process_client_hello() into a subroutine to be called at the post-processing stage (including the early callback itself), to allow the callback to result in remaining in the same work stage for a later call to succeed. This requires allocating for and storing the CLIENTHELLO_MSG in the SSL object to be preserved across such calls, but the storage is reclaimed after ClientHello processing finishes. Information about the CliehtHello is available to the callback by means of accessor functions that can only be used from the early callback. This allows extensions to make use of the existing internal parsing machinery without exposing structure internals (e.g., of PACKET), so that applications do not have to write fragile parsing code. Applications are encouraged to utilize an early callback and not use a servername_callback, in order to avoid unexpected behavior that occurs due to the relative order of processing between things like session resumption and the historical servername callback. Also tidy up nearby style by removing unnecessary braces around one-line conditional bodies. Reviewed-by: Matt Caswell <matt@openssl.org> Reviewed-by: Richard Levitte <levitte@openssl.org> (Merged from https://github.com/openssl/openssl/pull/2279)
5 years ago
Add TLSv1.3 post-handshake authentication (PHA) Add SSL_verify_client_post_handshake() for servers to initiate PHA Add SSL_force_post_handshake_auth() for clients that don't have certificates initially configured, but use a certificate callback. Update SSL_CTX_set_verify()/SSL_set_verify() mode: * Add SSL_VERIFY_POST_HANDSHAKE to postpone client authentication until after the initial handshake. * Update SSL_VERIFY_CLIENT_ONCE now only sends out one CertRequest regardless of when the certificate authentication takes place; either initial handshake, re-negotiation, or post-handshake authentication. Add 'RequestPostHandshake' and 'RequirePostHandshake' SSL_CONF options that add the SSL_VERIFY_POST_HANDSHAKE to the 'Request' and 'Require' options Add support to s_client: * Enabled automatically when cert is configured * Can be forced enabled via -force_pha Add support to s_server: * Use 'c' to invoke PHA in s_server * Remove some dead code Update documentation Update unit tests: * Illegal use of PHA extension * TLSv1.3 certificate tests DTLS and TLS behave ever-so-slightly differently. So, when DTLS1.3 is implemented, it's PHA support state machine may need to be different. Add a TODO and a #error Update handshake context to deal with PHA. The handshake context for TLSv1.3 post-handshake auth is up through the ClientFinish message, plus the CertificateRequest message. Subsequent Certificate, CertificateVerify, and Finish messages are based on this handshake context (not the Certificate message per se, but it's included after the hash). KeyUpdate, NewSessionTicket, and prior Certificate Request messages are not included in post-handshake authentication. After the ClientFinished message is processed, save off the digest state for future post-handshake authentication. When post-handshake auth occurs, copy over the saved handshake context into the "main" handshake digest. This effectively discards the any KeyUpdate or NewSessionTicket messages and any prior post-handshake authentication. This, of course, assumes that the ID-22 did not mean to include any previous post-handshake authentication into the new handshake transcript. This is implied by section 4.4.1 that lists messages only up to the first ClientFinished. Reviewed-by: Ben Kaduk <kaduk@mit.edu> Reviewed-by: Matt Caswell <matt@openssl.org> (Merged from https://github.com/openssl/openssl/pull/4964)
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