VerifiedPublicKeyCallback currently receives the public-key algorithm
declared in the outer authentication request. For RSA authentication,
that value can differ from the format of the signature that was
successfully verified because compatible RSA algorithm combinations are
accepted.
This can cause post-verification policy or audit decisions to use the
request algorithm instead of the signature format actually verified.
Pass sig.Format to VerifiedPublicKeyCallback so signatureAlgorithm
identifies the successfully verified signature format. Clarify the
callback documentation and add a regression test covering compatible
but different RSA request algorithms and signature formats.
Fixesgolang/go#80411
Change-Id: Ib405378d75367a90536e0814c9d26d4dec9aaa25
GitHub-Last-Rev: 1a4acd4e639361be1f2948a4aef1013436a75ecf
GitHub-Pull-Request: golang/crypto#364
Reviewed-on: https://go-review.googlesource.com/c/crypto/+/800740
Reviewed-by: Michael Pratt <mpratt@google.com>
Reviewed-by: Nicola Murino <nicola.murino@gmail.com>
Reviewed-by: David Chase <drchase@google.com>
Auto-Submit: Michael Pratt <mpratt@google.com>
LUCI-TryBot-Result: golang-scoped@luci-project-accounts.iam.gserviceaccount.com <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
CVE-2026-46595 extended source-address validation, historically applied
only to the Permissions returned by PublicKeyCallback, to the ones
returned by VerifiedPublicKeyCallback. The documented contract of
Permissions.CriticalOptions does not restrict enforcement to a specific
authentication method, so move the check to a single point at the end of
each authentication attempt, where it covers the Permissions returned by
any callback (password, keyboard-interactive, none and GSSAPI included).
The check at public key cache insertion time is kept: it remains
authoritative for the Permissions returned by PublicKeyCallback, which
VerifiedPublicKeyCallback may replace before the check at the end of the
authentication attempt runs and which are not re-checked on partial
success. It also still makes public key queries fail before the client
produces a signature when PublicKeyCallback supplies the restriction.
Fixes CVE-2026-56854
Fixesgolang/go#80213
Change-Id: Ibd612a8e4240bd710e33754f3ceb95bb29169d9a
Reviewed-on: https://go-review.googlesource.com/c/crypto/+/797040
Reviewed-by: Junyang Shao <shaojunyang@google.com>
LUCI-TryBot-Result: golang-scoped@luci-project-accounts.iam.gserviceaccount.com <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Filippo Valsorda <filippo@golang.org>
Reviewed-by: David Chase <drchase@google.com>
Make the runtime gssapi-with-mic guard match the existing
configuration and method advertisement checks.
An incomplete GSSAPIWithMICConfig can be treated as unavailable when
building the advertised auth method list, while still remaining
reachable from the runtime auth dispatcher. Treat incomplete
configurations as not configured.
This change introduces a single internal completeness check for
GSSAPIWithMICConfig and uses it for the startup authentication
validation, the runtime gssapi-with-mic dispatch guard, and the
advertised authentication method list.
The change also adds a regression test. The test configures a server
with a normal PasswordCallback, a GSSAPIWithMICConfig with Server set,
and AllowLogin intentionally unset. It then uses a custom client auth
method that explicitly sends a USERAUTH_REQUEST with Method set to
gssapi-with-mic even though the server does not advertise that method,
and verifies that authentication fails cleanly with
"ssh: gssapi-with-mic auth not configured".
No golang/go issue reference is available yet.
Change-Id: I9a0c965d3a56192bd68309aa41e2c1f91952036c
GitHub-Last-Rev: 0267bda8e15e7c258ba3b92cd54f0941534c5fc9
GitHub-Pull-Request: golang/crypto#345
Reviewed-on: https://go-review.googlesource.com/c/crypto/+/773460
Reviewed-by: Mark Freeman <markfreeman@google.com>
Reviewed-by: Nicola Murino <nicola.murino@gmail.com>
Reviewed-by: David Chase <drchase@google.com>
Reviewed-by: Filippo Valsorda <filippo@golang.org>
LUCI-TryBot-Result: golang-scoped@luci-project-accounts.iam.gserviceaccount.com <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
serverAuthenticate only bounded real failures via MaxAuthTries.
PartialSuccessError responses and the publickey isQuery short-circuit
both kept the loop running without incrementing authFailures, so a
client could keep the server processing SSH_MSG_USERAUTH_REQUEST
messages indefinitely on a single connection.
Add an unconditional cap, maxAuthServerAttempts = 128, on the total
number of userauth requests handled per connection. The counter is
incremented at the top of the loop before method dispatch, so every
method and every isQuery / partial-success path counts. When the cap
is exceeded the server sends SSH_MSG_DISCONNECT with reason 2 ("too
many authentication attempts"), mirroring the MaxAuthTries handling.
The bound is well below OpenSSH's hard cap of 1024 but above any
realistic multi-step auth flow.
Change-Id: I56779fc55cd00ddfd32ec938f8de3a49be0145dc
Reviewed-on: https://go-review.googlesource.com/c/crypto/+/781903
Reviewed-by: Junyang Shao <shaojunyang@google.com>
Reviewed-by: David Chase <drchase@google.com>
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Reviewed-by: Filippo Valsorda <filippo@golang.org>
Previously the library did not verify the "User Presence" (UP) bit in
signatures generated by FIDO/U2F security keys
(sk-ecdsa-sha2-nistp256@openssh.com and sk-ssh-ed25519@openssh.com).
This allowed signatures without physical interaction to be accepted
if the underlying hardware produced them, deviating from the default
secure behavior expected by the FIDO standards and OpenSSH.
skECDSAPublicKey.Verify and skEd25519PublicKey.Verify now enforce
the user-presence bit (0x01, constant flagUserPresence) by default.
Signatures whose flags byte has UP clear fail with the sentinel
errSKMissingUserPresence.
The server public-key authentication path honors the OpenSSH
"no-touch-required" extension as an opt-out. noTouchAllowed reports
true when the extension is present either in the Permissions
returned by PublicKeyCallback (authorized_keys-level opt-out) or in
the certificate's own Extensions (CA-level opt-out); in that case
skKeyWithoutUP is used to derive a clone of the SK public key (and,
for certificates, a clone of the wrapping Certificate whose inner
Key is the cloned SK key) whose Verify accepts UP-clear signatures.
The originals are never mutated, so a per-session opt-out cannot
leak across authentication attempts or connections. Matching
OpenSSH, the opt-out is read only from Extensions, never from
CriticalOptions.
skKeyWithoutUP is iterative and unwraps at most one level of
*Certificate: the SSH cert format forbids Certificate.Key from being
another Certificate (parseCert rejects it) but callers can still
construct such a value directly in Go, so a recursive descent would
be driven to unbounded depth by malformed or cyclic input. Any such
pathological *Certificate is returned unchanged.
CertChecker.CheckCert applies skKeyWithoutUP unconditionally to the
certificate's CA key before verifying the CA signature, matching
OpenSSH, which calls sshkey_verify with detailsp==NULL in
sshkey.c:cert_parse and never extracts or enforces UP/UV flags on
CA signatures. The UP bit on a CA signature reflects the CA
operator's presence at cert-issuance time, which has no bearing on
whether the user being authenticated is present now, so enforcing it
here would only break interop with certificates issued by
non-interactive SK CAs without a corresponding security benefit. The
skKeyWithoutUP call is a no-op for non-SK CA keys (the common case).
This change breaks backward compatibility for clients or keys that
generate user-authentication signatures without the User Presence
flag set. Previously those signatures were accepted by the server.
They will now be rejected with "ssh: signature missing required user
presence flag" unless the "no-touch-required" extension is
explicitly granted to the session by the server callbacks, or
carried by the user certificate.
This issue was found during a security audit by NCC Group
Cryptography Services, sponsored by Teleport.
Fixesgolang/go#79566
Fixes CVE-2026-39831
Change-Id: I74b6de3bb6a2d7a0f34d7fa36bbbbf06f0b3fc6b
Reviewed-on: https://go-review.googlesource.com/c/crypto/+/781662
Reviewed-by: Neal Patel <nealpatel@google.com>
Reviewed-by: Roland Shoemaker <roland@golang.org>
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In serverAuthenticate, the permissions variable is reset to nil at the
beginning of the authentication loop. If an authentication callback
returns a PartialSuccessError along with non-nil Permissions, those
permissions are currently silently discarded before the next
authentication step.
This change returns an error if a callback returns both a PartialSuccessError
and non-nil Permissions, preventing API misuse where the user might
erroneously expect those permissions to be preserved or merged into the
final session permissions.
This issue was found during a security audit by NCC Group Cryptography
Services, sponsored by Teleport.
Fixesgolang/go#79562
Fixes CVE-2026-39828
Change-Id: I632c9e46e2b5e8804ef88081063a3612a2462f9f
Reviewed-on: https://go-review.googlesource.com/c/crypto/+/781621
Reviewed-by: Neal Patel <nealpatel@google.com>
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Reviewed-by: Roland Shoemaker <roland@golang.org>
We add this support for the following reasons:
- We are planning to expose recommended (secure) vs. supported (works,
not necessarily recommended) algorithms. The DHGEX kex is currently
only exposed as a client-side kex. To simplify the calling convention
for this follow-on, we expose the server side too.
- Some clients are quite inflexible with reference to kex algorithms
choice, for example they offer:
diffie-hellman-group-exchange-sha256, diffie-hellman-group-exchange-sha1,
diffie-hellman-group14-sha1, diffie-hellman-group1-sha1
therefore DHGEX helps interoperability.
We do not recommend the DHGEX kex as a whole:
- the negotiation requires an extra round trip
- the server must generate parameters (slow) or hardcode them, which
defeats the security benefit over traditional DH.
In this implementation we hardcode sending Oakley Group 14, Oakley
Group 15 or Oakley Group 16 based on the requested max size.
Users that are concerned with security of classical DH kex should
migrate to kex based on EC or Ed25519.
Fixesgolang/go#54743
Change-Id: I127822e90efc36821af4aca679931f40a2023021
Reviewed-on: https://go-review.googlesource.com/c/crypto/+/532415
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Auto-Submit: Nicola Murino <nicola.murino@gmail.com>
Reviewed-by: Filippo Valsorda <filippo@golang.org>
Reviewed-by: Han-Wen Nienhuys <hanwen@google.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Users of the the ssh package seem to extremely commonly misuse the
PublicKeyCallback API, assuming that the key passed in the last call
before a connection is established is the key used for authentication.
Some users then make authorization decisions based on this key. This
property is not documented, and may not be correct, due to the caching
behavior of the package, resulting in users making incorrect
authorization decisions about the connection.
This change makes the cache a one entry FIFO cache, making the assumed
property, that the last call to PublicKeyCallback represents the key
actually used for authentication, actually hold.
Thanks to Damien Tournoud, Patrick Dawkins, Vince Parker, and
Jules Duvivier from the Platform.sh / Upsun engineering team
for reporting this issue.
Fixesgolang/go#70779
Fixes CVE-2024-45337
Change-Id: Ife7c7b4045d8b6bcd7e3a417bdfae370c709797f
Reviewed-on: https://go-review.googlesource.com/c/crypto/+/635315
Reviewed-by: Roland Shoemaker <roland@golang.org>
Auto-Submit: Gopher Robot <gobot@golang.org>
Reviewed-by: Damien Neil <dneil@google.com>
Reviewed-by: Nicola Murino <nicola.murino@gmail.com>
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After adding support for rsa-sha2-256/512 on the server side some edge
cases started to arise with old clients:
1) public key authentication with gpg-agent < 2.2.6 fails because we
receive ssh-rsa as signature format and rsa-sha2-256 or rsa-sha2-512
as algorithm.
This is a bug in gpg-agent fixed in this commit:
https://github.com/gpg/gnupg/commit/80b775bdbb852aa4a80292c9357e5b1876110c00
2) certificate authentication fails with OpenSSH 7.2-7.7 because we
receive ssh-rsa-cert-v01@openssh.com as algorithm and rsa-sha2-256
or rsa-sha2-512 as signature format.
This patch is based on CL 412854 and has been tested with every version
of OpenSSH from 7.1 to 7.9 and OpenSSH 9.3.
Fixesgolang/go#53391
Change-Id: Id71f596f73d84efb5c76d6d5388432cccad3e3b1
Reviewed-on: https://go-review.googlesource.com/c/crypto/+/506835
Auto-Submit: Filippo Valsorda <filippo@golang.org>
Reviewed-by: Filippo Valsorda <filippo@golang.org>
Run-TryBot: Filippo Valsorda <filippo@golang.org>
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Reviewed-by: Roland Shoemaker <roland@golang.org>
CL 220037 had implemented support for host authentication using
rsa-sha2-256/512, but not client public key authentication. OpenSSH
disabled the SHA-1 based ssh-rsa by default in version 8.8 (after
pre-announcing it in versions 8.2, 8.3, 8.4, 8.5, 8.6, and 8.7) although
some distributions re-enable it. GitHub will start rejecting ssh-rsa for
keys uploaded before November 2, 2021 on March 15, 2022.
https://github.blog/2021-09-01-improving-git-protocol-security-github/
The server side already worked, as long as the client selected one of
the SHA-2 algorithms, because the signature flowed freely to Verify.
There was however nothing verifying that the signature algorithm matched
the advertised one. The comment suggested the check was being performed,
but it got lost back in CL 86190043. Not a security issue because the
signature had to pass the callback's Verify method regardless, and both
values were checked to be acceptable.
Tested with OpenSSH 8.8 configured with "PubkeyAcceptedKeyTypes -ssh-rsa"
and no application-side changes.
The Signers returned by ssh/agent (when backed by an agent client)
didn't actually implement AlgorithmSigner but ParameterizedSigner, an
interface defined in an earlier version of CL 123955.
Updates golang/go#49269Fixesgolang/go#39885
For golang/go#49952
Change-Id: I13b41db8041f1112a70f106c55f077b904b12cb8
Reviewed-on: https://go-review.googlesource.com/c/crypto/+/392394
Trust: Filippo Valsorda <filippo@golang.org>
Run-TryBot: Filippo Valsorda <filippo@golang.org>
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Reviewed-by: Roland Shoemaker <roland@golang.org>
The server side implementation was not actually populating the
SSH_MSG_USERAUTH_INFO_REQUEST field with the
KeyboardInteractiveChallenge argument, although the client side was
deserializing it and passing it to the KeyboardInteractiveChallenge
callback.
Anyway, the first field of SSH_MSG_USERAUTH_INFO_REQUEST is "name", not
"user". Maybe the confusion was due to the first field of
SSH_MSG_USERAUTH_REQUEST being the user.
RFC 4256, Section 3.3, says this about it
One possibility is to use the name field (possibly
prefixed with the application's name) as the title of a dialog window
in which the prompt(s) are presented.
and examples include "CRYPTOCard Authentication", "Password
Authentication", and "Password Expired".
Co-authored-by: Kevin Wallace <kevin@pentabarf.net>
Change-Id: Ic6ec0dfea2122704603c44f42898a980689a15c9
Reviewed-on: https://go-review.googlesource.com/c/crypto/+/372234
Trust: Filippo Valsorda <filippo@golang.org>
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The server implementation looks at the HostKeys to advertise and
negotiate host key signature algorithms. A fundamental issue of the
Signer and AlgorithmSigner interfaces is that they don't expose the
supported signature algorithms, so really the server has to guess.
Currently, it would guess exclusively based on the PublicKey.Type,
regardless of whether the host key implemented AlgorithmSigner. This
means that a legacy Signer that only supports ssh-rsa still led the
server to negotiate rsa-sha2 algorithms. The server would then fail to
find a suitable host key to make the signature and crash.
This won't happen if only Signers from this package are used, but if a
custom Signer that doesn't support SignWithAlgorithm() but returns
"ssh-rsa" from PublicKey().Type() is used as a HostKey, the server is
vulnerable to DoS.
The only workable rules to determine what to advertise seems to be:
1. a pure Signer will always Sign with the PublicKey.Type
2. an AlgorithmSigner supports all algorithms associated with the
PublicKey.Type
Rule number two means that we can't add new supported algorithms in the
future, which is not great, but it's too late to fix that.
rsaSigner was breaking rule number one, and although it would have been
fine where it's used, I didn't want to break our own interface contract.
It's unclear why we had separate test key entries for rsa-sha2
algorithms, since we can use the ssh-rsa key for those. The only test
that used them, TestCertTypes, seemed broken: the init was actually
failing at making the corresponding signers rsaSigners, and indeed the
test for the SHA-256 signer expected and checked a SHA-512 signature.
Pending CVE
For golang/go#49952
Change-Id: Ie658eefcadd87906e63fc7faae8249376aa96c79
Reviewed-on: https://go-review.googlesource.com/c/crypto/+/392355
Trust: Filippo Valsorda <filippo@golang.org>
Run-TryBot: Filippo Valsorda <filippo@golang.org>
Reviewed-by: Roland Shoemaker <roland@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
RFC 8332, Section 2 sets up two overlapping namespaces: public key
formats and public key algorithms.
* The formats are what we currently have KeyAlgo constants for, and they
appear in PublicKey.Type.
* The algorithms are the set of both KeyAlgo and SigAlgo constants, and
they appear in Signature.Format (amongst other places).
This is incoherent, because that means Signature.Format can be both a
KeyAlgo (like KeyAlgoECDSA256) or a SigAlgo (like SigAlgoRSASHA2256).
One solution would be to duplicate all the KeyAlgo constants into the
SigAlgo namespace, but that would be confusing because applications are
currently using KeyAlgos where they'd be supposed to use the new
SigAlgos (while we can't deprecate the KeyAlgos because they are still
necessary for the PublicKey.Type namespace).
Instead, drop the separate namespaces, and use KeyAlgos throughout.
There are simply some KeyAlgos that can't be a PublicKey.Type.
Take the opportunity to fix the stuttering SHA22565/SHA2512 names. It's
totally ok to call those hashes SHA-256 and SHA-512 without the family
infix.
For golang/go#49952
Change-Id: Ia1fce3912a7e60aa70a88f75ed311be331fd19d5
Reviewed-on: https://go-review.googlesource.com/c/crypto/+/392354
Trust: Filippo Valsorda <filippo@golang.org>
Run-TryBot: Filippo Valsorda <filippo@golang.org>
Reviewed-by: Roland Shoemaker <roland@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
If we are going to send the disconnect message and close the connection,
because we have exhausted the number of authentication attempts, don't
send the final authentication failure message. This behavior matches
that of OpenSSH.
Fixesgolang/go#51149
Change-Id: I43b2de2e854f789161cd7fd6c05876661adfb2c1
Reviewed-on: https://go-review.googlesource.com/c/crypto/+/385236
Trust: Roland Shoemaker <roland@golang.org>
Run-TryBot: Roland Shoemaker <roland@golang.org>
Auto-Submit: Roland Shoemaker <roland@golang.org>
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Reviewed-by: Ian Lance Taylor <iant@golang.org>
This change adds support for RSA SHA-2 based signatures for host keys and certificates. It also switches the default certificate signature algorithm for RSA to use SHA-512. This is implemented by treating ssh.Signer specially when the key type is `ssh-rsa` by also allowing SHA-256 and SHA-512 signatures.
Fixesgolang/go#37278
Change-Id: I2ee1ac4ae4c9c1de441a2d6cf1e806357ef18910
Reviewed-on: https://go-review.googlesource.com/c/crypto/+/220037
Trust: Jason A. Donenfeld <Jason@zx2c4.com>
Run-TryBot: Jason A. Donenfeld <Jason@zx2c4.com>
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Reviewed-by: Jason A. Donenfeld <Jason@zx2c4.com>
Reviewed-by: Roland Shoemaker <roland@golang.org>
The ability to trigger the 'gssapi-with-mic' authentication method is
not properly gated by the presence of the GSSAPIWithMICConfig field of
the ServerConfig type. If this field is not set and a client sends a
'gssapi-with-mic' request, regardless of if the server advertises it,
the server will panic.
This issue was discovered and reported by Joern Schneewesiz, GitLab
Security Research Team.
Fixes CVE-2020-29652
Change-Id: Ie25de2766e442c8ab46680aae3ac89b0823cdeed
Reviewed-on: https://go-review.googlesource.com/c/crypto/+/278852
Trust: Roland Shoemaker <roland@golang.org>
Run-TryBot: Roland Shoemaker <roland@golang.org>
Reviewed-by: Filippo Valsorda <filippo@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Add the diffie-hellman-group-exchange-sha256 defined in RFC 4419 to
the list of supported key exchange algorithms for ssh.
The server half is only a minimal implementation to satisfy the automated tests.
Fixesgolang/go#17230
Change-Id: I25880a564347fd9b4738dd2ed1e347cd5d2e21bb
GitHub-Last-Rev: 9f0b8d02c0c96e9baf00cdf1cf063ff834245443
GitHub-Pull-Request: golang/crypto#87
Reviewed-on: https://go-review.googlesource.com/c/crypto/+/174257
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Previously, this would return the default error "no auth passed yet".
Not only is the new error more specific, it makes it easier to verify
the control flow of server authentication code.
Change-Id: I6c8de4e3f91da74274acbe9d87ec4f6158b4a94f
Reviewed-on: https://go-review.googlesource.com/c/142897
Run-TryBot: Han-Wen Nienhuys <hanwen@google.com>
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Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Fix typo in error message when keyboard-interactive auth not supported by server and client requests it
Change-Id: Iedb72625852f03552481d85cce2119765cfba320
GitHub-Last-Rev: ee47092daf8c40fe3e0e166e7370556819457af6
GitHub-Pull-Request: golang/crypto#59
Reviewed-on: https://go-review.googlesource.com/c/141658
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
yet.
Since ServerAuthError returns all errors collected during the
userAuthLoop, it will always include the generic error "no auth passed
yet" (assuming the connection fails).
Change-Id: I5f6c67f3f0762b023618178d4028600d2b6c9253
Reviewed-on: https://go-review.googlesource.com/92737
Reviewed-by: Han-Wen Nienhuys <hanwen@google.com>
Run-TryBot: Han-Wen Nienhuys <hanwen@google.com>
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Only show the SSH banner once, even if the client attempts
authentication with the "none" type and resets the authentication
attempts.
Change-Id: I1a7aacb50abf00233ed4d06c60808aaf51a9d7be
Reviewed-on: https://go-review.googlesource.com/78544
Run-TryBot: Sam Whited <sam@samwhited.com>
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According to RFC 4252 section 5.4, the banner is sent between the
ssh-connection request and responding to user authentication.
Original support for server sending banner by joshua stein <jcs@jcs.org>
Fixesgolang/go#19567
Change-Id: I729b3c8e5fd2c0068609d1590b61e92f40d87ea4
Reviewed-on: https://go-review.googlesource.com/71790
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According to RFC 4252 section 5.4, the banner is sent between the
ssh-connection request and responding to user authentication.
Original support for server sending banner by joshua stein <jcs@jcs.org>
Fixesgolang/go#19567
Change-Id: I68944a7f4711c0623759f6a59023e8e45a8781aa
Reviewed-on: https://go-review.googlesource.com/65271
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Akira
Nicholas S. Husin
Nicola Murino
povcfe
Neal Patel
Brad Fitzpatrick
Roland Shoemaker
Andrew Lytvynov
Edoardo Spadolini
Matt Dainty
cuishuang
Hans Nielsen
Sebastian Kinne
Lucas Bremgartner
yanweizhi
Han-Wen Nienhuys
mkishere
Spencer Tung
Peter Moody
Sam Whited
Tugdual Saunier