- Jul 23, 2018
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Matt Caswell authored
In some circumstances it is possible for a client to have a session reporting a max early data value that is greater than the server will support. In such cases the client could encounter an aborted connection. Fixes #6735 Reviewed-by:
Kurt Roeckx <kurt@roeckx.be> (Merged from https://github.com/openssl/openssl/pull/6740)
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- Jul 22, 2018
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Andy Polyakov authored
ecp_nistz256_set_from_affine is called when application attempts to use custom generator, i.e. rarely. Even though it was wrong, it didn't affect point operations, they were just not as fast as expected. Reviewed-by:
Rich Salz <rsalz@openssl.org> (Merged from https://github.com/openssl/openssl/pull/6738)
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Andy Polyakov authored
The ecp_nistz256_scatter_w7 function is called when application attempts to use custom generator, i.e. rarely. Even though non-x86_64 versions were wrong, it didn't affect point operations, they were just not as fast as expected. Reviewed-by:
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Andy Polyakov authored
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Andy Polyakov authored
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Matthias St. Pierre <Matthias.St.Pierre@ncp-e.com> Reviewed-by:
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Richard Levitte authored
Fixes #6755 Reviewed-by:
Tim Hudson <tjh@openssl.org> (Merged from https://github.com/openssl/openssl/pull/6759)
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Richard Levitte authored
As per RFC 7292. Fixes #6665 Reviewed-by:
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- Jul 20, 2018
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Benjamin Kaduk authored
The API used to set what SNI value to send in the ClientHello can also be used on server SSL objects, with undocumented and un-useful behavior. Unfortunately, when generic SSL_METHODs are used, s->server is still set, prior to the start of the handshake, so we cannot prevent this nonsensical usage at the present time. Leave a note to revisit this when ABI-breaking changes are permitted. Reviewed-by:
Matt Caswell <matt@openssl.org> (Merged from https://github.com/openssl/openssl/pull/6378)
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Benjamin Kaduk authored
In particular, adhere to the rule that we must not modify any property of an SSL_SESSION object once it is (or might be) in a session cache. Such modifications are thread-unsafe and have been observed to cause crashes at runtime. To effect this change, standardize on the property that SSL_SESSION->ext.hostname is set only when that SNI value has been negotiated by both parties for use with that session. For session resumption this is trivially the case, so only new handshakes are affected. On the client, the new semantics are that the SSL->ext.hostname is for storing the value configured by the caller, and this value is used when constructing the ClientHello. On the server, SSL->ext.hostname is used to hold the value received from the client. Only if the SNI negotiation is successful will the hostname be stored into the session object; the server can do this after it sends the ServerHello, and the client after it has received and processed the ServerHello. This obviates the need to remove the hostname from the session object in case of failed negotiation (a change that was introduced in commit 9fb6cb81 in order to allow TLS 1.3 early data when SNI was present in the ClientHello but not the session being resumed), which was modifying cached sessions in certain cases. (In TLS 1.3 we always produce a new SSL_SESSION object for new connections, even in the case of resumption, so no TLS 1.3 handshakes were affected.) Reviewed-by:
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Benjamin Kaduk authored
These tiny functions only read from the input SSL, and we are about to use them from functions that only have a const SSL* available, so propagate const a bit further. Reviewed-by:
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Andy Polyakov authored
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Andy Polyakov authored
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Andy Polyakov authored
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Andy Polyakov authored
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Andy Polyakov authored
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Matt Caswell authored
The spec says that a client MUST set legacy_version to TLSv1.2, and requires servers to verify that it isn't SSLv3. Fixes #6600 Reviewed-by:
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Matt Caswell authored
Use the latest version of the test vectors available in: https://tools.ietf.org/html/draft-ietf-tls-tls13-vectors-06 Reviewed-by:
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- Jul 19, 2018
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Matt Caswell authored
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Matt Caswell authored
It is not valid to send early_data after an HRR has been received. Fixes #6734 Reviewed-by:
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- Jul 18, 2018
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Andy Polyakov authored
Reviewed-by:
David Benjamin <davidben@google.com> (Merged from https://github.com/openssl/openssl/pull/6664)
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Andy Polyakov authored
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Andy Polyakov authored
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Andy Polyakov authored
Originally suggested solution for "Return Of the Hidden Number Problem" is arguably too expensive. While it has marginal impact on slower curves, none to ~6%, optimized implementations suffer real penalties. Most notably sign with P-256 went more than 2 times[!] slower. Instead, just implement constant-time BN_mod_add_quick. Reviewed-by:
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Andy Polyakov authored
It was false positive, but one can as well view it as readability issue. Switch even to unsigned indices because % BN_BYTES takes 4-6 instructions with signed dividend vs. 1 (one) with unsigned. Reviewed-by: -
Matt Caswell authored
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Matt Caswell authored
Using the rsa_pss_rsae_sha256 sig alg should imply that the key OID is rsaEncryption. Similarly rsa_pss_pss_sha256 implies the key OID is rsassaPss. However we did not check this and incorrectly tolerated a key OID that did not match the sig alg sent by the peer. Fixes #6611 Reviewed-by:
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- Jul 17, 2018
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Mat authored
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Matt Caswell authored
The GOST ciphers are dynamically loaded via the GOST engine, so we must be able to support that. The engine also uses DSA and CMS symbols, so we skip the test on no-dsa or no-cms. Reviewed-by:
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Matt Caswell authored
Also fixes a function name typo. Reviewed-by:
Bernd Edlinger <bernd.edlinger@hotmail.de> (Merged from https://github.com/openssl/openssl/pull/6729)
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Matt Caswell authored
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Matt Caswell authored
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Matt Caswell authored
Previously we were failing to issue new tickets if a resumption attempt failed. Fixes #6654 Reviewed-by:
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Matt Caswell authored
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Matt Caswell authored
If we issue new tickets due to post-handshake authentication there is no reason to remove previous tickets from the cache. The code that did that only removed the last session anyway - so if more than one ticket got issued then those other tickets are still valid. Reviewed-by:
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- Jul 16, 2018
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Kurt Roeckx authored
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Kurt Roeckx authored
The config file can override it. In case of the server, it needs to be set on the ctx or some of the other functions on the ctx might file. Reviewed-by: -
Nicola Tuveri authored
By default `ec_scalar_mul_ladder` (which uses the Lopez-Dahab ladder implementation) is used only for (k * Generator) or (k * VariablePoint). ECDSA verification uses (a * Generator + b * VariablePoint): this commit forces the use of `ec_scalar_mul_ladder` also for the ECDSA verification path, while using the default wNAF implementation for any other case. With this commit `ec_scalar_mul_ladder` loses the static attribute, and is added to ec_lcl.h so EC_METHODs can directly use it. While working on a new custom EC_POINTs_mul implementation, I realized that many checks (e.g. all the points being compatible with the given EC_GROUP, creating a temporary BN_CTX if `ctx == NULL`, check for the corner case `scalar == NULL && num == 0`) were duplicated again and again in every single implementation (and actually some implementations lacked some of the tests). I thought that it makes way more sense for those checks that are independent from the actual implementation and should always be done, to be moved in the EC_POINTs_mul wrapper: so this commit also includes these changes. Reviewed-by:
Andy Polyakov <appro@openssl.org> Reviewed-by:
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Nicola Tuveri authored
This commit uses the new ladder scaffold to implement a specialized ladder step based on differential addition-and-doubling in mixed Lopez-Dahab projective coordinates, modified to independently blind the operands. The arithmetic in `ladder_pre`, `ladder_step` and `ladder_post` is auto generated with tooling: - see, e.g., "Guide to ECC" Alg 3.40 for reference about the `ladder_pre` implementation; - see https://www.hyperelliptic.org/EFD/g12o/auto-code/shortw/xz/ladder/mladd-2003-s.op3 for the differential addition-and-doubling formulas implemented in `ladder_step`; - see, e.g., "Fast Multiplication on Elliptic Curves over GF(2**m) without Precomputation" (Lopez and Dahab, CHES 1999) Appendix Alg Mxy for the `ladder_post` implementation to recover the `(x,y)` result in affine coordinates. Co-authored-by:
Billy Brumley <bbrumley@gmail.com> Co-authored-by:
Sohaib ul Hassan <soh.19.hassan@gmail.com> Reviewed-by:
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Billy Brumley authored
and catch corner cases better and earlier Reviewed-by:
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Nicola Tuveri authored
for specialized Montgomery ladder implementations PR #6009 and #6070 replaced the default EC point multiplication path for prime and binary curves with a unified Montgomery ladder implementation with various timing attack defenses (for the common paths when a secret scalar is feed to the point multiplication). The newly introduced default implementation directly used EC_POINT_add/dbl in the main loop. The scaffolding introduced by this commit allows EC_METHODs to define a specialized `ladder_step` function to improve performances by taking advantage of efficient formulas for differential addition-and-doubling and different coordinate systems. - `ladder_pre` is executed before the main loop of the ladder: by default it copies the input point P into S, and doubles it into R. Specialized implementations could, e.g., use this hook to transition to different coordinate systems before copying and doubling; - `ladder_step` is the core of the Montgomery ladder loop: by default it computes `S := R+S; R := 2R;`, but specific implementations could, e.g., implement a more efficient formula for differential addition-and-doubling; - `ladder_post` is executed after the Montgomery ladder loop: by default it's a noop, but specialized implementations could, e.g., use this hook to transition back from the coordinate system used for optimizing the differential addition-and-doubling or recover the y coordinate of the result point. This commit also renames `ec_mul_consttime` to `ec_scalar_mul_ladder`, as it better corresponds to what this function does: nothing can be truly said about the constant-timeness of the overall execution of this function, given that the underlying operations are not necessarily constant-time themselves. What this implementation ensures is that the same fixed sequence of operations is executed for each scalar multiplication (for a given EC_GROUP), with no dependency on the value of the input scalar. Co-authored-by:
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