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Doing an abort() seems all right in development builds, but not in
production builds of general-purpose libraries. However, the functions
that were doing this lack any way to report a failure back up to their
callers. It seems like we can just get away with ignoring failures in
production builds, since (a) no such failures have been reported in the
dozen years that the code's been like this, and (b) failure to enforce
mutual exclusion during fe-auth.c operations would likely not cause any
problems anyway in most cases. (The OpenSSL callbacks that use this
macro are obsolete, so even less likely to cause interesting problems.)
Possibly a better answer would be to break compatibility of the
pgthreadlock_t callback API, but in the absence of field problem
reports, it doesn't really seem worth the trouble.
Discussion: https://postgr.es/m/3131385.1624746109@sss.pgh.pa.us
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Fix handling of NULL host name (possibly by using hostaddr). It
previously crashed. Also, we should look at connhost, not pghost, to
handle multi-host specifications.
Also remove an unnecessary SSL_CTX_free().
Reported-by: Jacob Champion <pchampion@vmware.com>
Reviewed-by: Michael Paquier <michael@paquier.xyz>
Discussion: https://www.postgresql.org/message-id/504c276ab6eee000bb23d571ea9b0ced4250774e.camel@vmware.com
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Also "make reformat-dat-files".
The only change worthy of note is that pgindent messed up the formatting
of launcher.c's struct LogicalRepWorkerId, which led me to notice that
that struct wasn't used at all anymore, so I just took it out.
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By default, have libpq set the TLS extension "Server Name Indication" (SNI).
This allows an SNI-aware SSL proxy to route connections. (This
requires a proxy that is aware of the PostgreSQL protocol, not just
any SSL proxy.)
In the future, this could also allow the server to use different SSL
certificates for different host specifications. (That would require
new server functionality. This would be the client-side functionality
for that.)
Since SNI makes the host name appear in cleartext in the network
traffic, this might be undesirable in some cases. Therefore, also add
a libpq connection option "sslsni" to turn it off.
Discussion: https://www.postgresql.org/message-id/flat/7289d5eb-62a5-a732-c3b9-438cee2cb709%40enterprisedb.com
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Based on an analysis of the OpenSSL code with Jacob, moving to EVP for
the cryptohash computations makes necessary the setup of the libcrypto
callbacks that were getting set only for SSL connections, but not for
connections without SSL. Not setting the callbacks makes the use of
threads potentially unsafe for connections calling cryptohashes during
authentication, like MD5 or SCRAM, if a failure happens during a
cryptohash computation. The logic setting the libssl and libcrypto
states is then split into two parts, both using the same locking, with
libcrypto being set up for SSL and non-SSL connections, while SSL
connections set any libssl state afterwards as needed.
Prior to this commit, only SSL connections would have set libcrypto
callbacks that are necessary to ensure a proper thread locking when
using multiple concurrent threads in libpq (ENABLE_THREAD_SAFETY). Note
that this is only required for OpenSSL 1.0.2 and 1.0.1 (oldest version
supported on HEAD), as 1.1.0 has its own internal locking and it has
dropped support for CRYPTO_set_locking_callback().
Tests with up to 300 threads with OpenSSL 1.0.1 and 1.0.2, mixing SSL
and non-SSL connection threads did not show any performance impact after
some micro-benchmarking. pgbench can be used here with -C and a
mostly-empty script (with one \set meta-command for example) to stress
authentication requests, and we have mixed that with some custom
programs for testing.
Reported-by: Jacob Champion
Author: Michael Paquier
Reviewed-by: Jacob Champion
Discussion: https://postgr.es/m/fd3ba610085f1ff54623478cf2f7adf5af193cbb.camel@vmware.com
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This partially reverts 096bbf7 and 9d2d457, undoing the libpq changes as
it could cause breakages in distributions that share one single libpq
version across multiple major versions of Postgres for extensions and
applications linking to that.
Note that the backend is unchanged here, and it still disables SSL
compression while simplifying the underlying catalogs that tracked if
compression was enabled or not for a SSL connection.
Per discussion with Tom Lane and Daniel Gustafsson.
Discussion: https://postgr.es/m/YEbq15JKJwIX+S6m@paquier.xyz
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PostgreSQL disabled compression as of e3bdb2d and the documentation
recommends against using it since. Additionally, SSL compression has
been disabled in OpenSSL since version 1.1.0, and was disabled in many
distributions long before that. The most recent TLS version, TLSv1.3,
disallows compression at the protocol level.
This commit removes the feature itself, removing support for the libpq
parameter sslcompression (parameter still listed for compatibility
reasons with existing connection strings, just ignored), and removes
the equivalent field in pg_stat_ssl and de facto PgBackendSSLStatus.
Note that, on top of removing the ability to activate compression by
configuration, compression is actively disabled in both frontend and
backend to avoid overrides from local configurations.
A TAP test is added for deprecated SSL parameters to check after
backwards compatibility.
Bump catalog version.
Author: Daniel Gustafsson
Reviewed-by: Peter Eisentraut, Magnus Hagander, Michael Paquier
Discussion: https://postgr.es/m/7E384D48-11C5-441B-9EC3-F7DB1F8518F6@yesql.se
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Add another method to specify CRLs, hashed directory method, for both
server and client side. This offers a means for server or libpq to
load only CRLs that are required to verify a certificate. The CRL
directory is specifed by separate GUC variables or connection options
ssl_crl_dir and sslcrldir, alongside the existing ssl_crl_file and
sslcrl, so both methods can be used at the same time.
Author: Kyotaro Horiguchi <horikyota.ntt@gmail.com>
Discussion: https://www.postgresql.org/message-id/flat/20200731.173911.904649928639357911.horikyota.ntt@gmail.com
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The callback for retrieving state change information during connection
setup was only installed when the connection was mostly set up, and
thus didn't provide much information and missed all the details related
to the handshake.
This also extends the callback with SSL_state_string_long() to print
more information about the state change within the SSL object handled.
While there, fix some comments which were incorrectly referring to the
callback and its previous location in fe-secure.c.
Author: Daniel Gustafsson
Discussion: https://postgr.es/m/232CF476-94E1-42F1-9408-719E2AEC5491@yesql.se
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Previously, we had an undisciplined mish-mash of printfPQExpBuffer and
appendPQExpBuffer calls to report errors within libpq. This commit
establishes a uniform rule that appendPQExpBuffer[Str] should be used.
conn->errorMessage is reset only at the start of an application request,
and then accumulates messages till we're done. We can remove no less
than three different ad-hoc mechanisms that were used to get the effect
of concatenation of error messages within a sequence of operations.
Although this makes things quite a bit cleaner conceptually, the main
reason to do it is to make the world safer for the multiple-target-host
feature that was added awhile back. Previously, there were many cases
in which an error occurring during an individual host connection attempt
would wipe out the record of what had happened during previous attempts.
(The reporting is still inadequate, in that it can be hard to tell which
host got the failure, but that seems like a matter for a separate commit.)
Currently, lo_import and lo_export contain exceptions to the "never
use printfPQExpBuffer" rule. If we changed them, we'd risk reporting
an incidental lo_close failure before the actual read or write
failure, which would be confusing, not least because lo_close happened
after the main failure. We could improve this by inventing an
internal version of lo_close that doesn't reset the errorMessage; but
we'd also need a version of PQfn() that does that, and it didn't quite
seem worth the trouble for now.
Discussion: https://postgr.es/m/BN6PR05MB3492948E4FD76C156E747E8BC9160@BN6PR05MB3492.namprd05.prod.outlook.com
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Backpatch-through: 9.5
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Apparently 1.0.1 lacks SSL_R_VERSION_TOO_HIGH and
SSL_R_VERSION_TOO_LOW. Per buildfarm.
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OpenSSL's native reports about problems related to protocol version
restrictions are pretty opaque and inconsistent. When we get an
SSL error that is plausibly due to this, emit a hint message that
includes the range of SSL protocol versions we (think we) are
allowing. This should at least get the user thinking in the right
direction to resolve the problem, even if the hint isn't totally
accurate, which it might not be for assorted reasons.
Back-patch to v13 where we increased the default minimum protocol
version, thereby increasing the risk of this class of failure.
Patch by me, reviewed by Daniel Gustafsson
Discussion: https://postgr.es/m/a9408304-4381-a5af-d259-e55d349ae4ce@2ndquadrant.com
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Make the wording of new libpq messages more similar to existing
messages in the backend.
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libpq's exports.txt was overlooked in commit 36d108761, which the
buildfarm is quite unhappy about.
Also, I'd gathered that the plan included renaming PQgetSSLKeyPassHook
to PQgetSSLKeyPassHook_OpenSSL, but that didn't happen in the patch
as committed. I'm taking it on my own authority to do so now, since
the window before beta1 is closing fast.
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4dc6355210 provided a way for libraries and clients to modify how libpq
handles client certificate passphrases, by installing a hook. However,
these routines are quite specific to how OpenSSL works, so it's
misleading and not future-proof to have these names not refer to OpenSSL.
Change all the names to add "_OpenSSL" after "Hook", and fix the docs
accordingly.
Author: Daniel Gustafsson
Discussion: https://postgr.es/m/981DE552-E399-45C2-9F60-3F0E3770CC61@yesql.se
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Thomas Munro fixed a longstanding annoyance in pg_bsd_indent, that
it would misformat lines containing IsA() macros on the assumption
that the IsA() call should be treated like a cast. This improves
some other cases involving field/variable names that match typedefs,
too. The only places that get worse are a couple of uses of the
OpenSSL macro STACK_OF(); we'll gladly take that trade-off.
Discussion: https://postgr.es/m/20200114221814.GA19630@alvherre.pgsql
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Includes some manual cleanup of places that pgindent messed up,
most of which weren't per project style anyway.
Notably, it seems some people didn't absorb the style rules of
commit c9d297751, because there were a bunch of new occurrences
of function calls with a newline just after the left paren, all
with faulty expectations about how the rest of the call would get
indented.
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The type is called "pem_password_cb", not "pem_passwd_cb".
Author: Daniel Gustafsson
Discussion: https://www.postgresql.org/message-id/22108CF6-228B-45CF-9CDA-5C5F658DCC22@yesql.se
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The libpq parameters ssl{max|min}protocolversion are renamed to use
underscores, to become ssl_{max|min}_protocol_version. The related
environment variables still use the names introduced in commit ff8ca5f
that added the feature.
Per complaint from Peter Eisentraut (this was also mentioned by me in
the original patch review but the issue got discarded).
Author: Daniel Gustafsson
Reviewed-by: Peter Eisentraut, Michael Paquier
Discussion: https://postgr.es/m/b319e449-318d-e691-4997-1327e166fcc4@2ndquadrant.com
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Checking if Subject Alternative Names (SANs) from a certificate match
with the hostname connected to leaked memory after each lookup done.
This is broken since acd08d7 that added support for SANs in SSL
certificates, so backpatch down to 9.5.
Author: Roman Peshkurov
Reviewed-by: Hamid Akhtar, Michael Paquier, David Steele
Discussion: https://postgr.es/m/CALLDf-pZ-E3mjxd5=bnHsDu9zHEOnpgPgdnO84E2RuwMCjjyPw@mail.gmail.com
Backpatch-through: 9.5
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The error exits added to initialize_SSL() failed to clean up the
partially-built SSL_context, and some of them also leaked the
result of SSLerrmessage(). Make them match other error-handling
cases in that function.
The error exits added to connectOptions2() failed to set conn->status
like every other error exit in that function.
In passing, make the SSL_get_peer_certificate() error exit look more
like all the other calls of SSLerrmessage().
Oversights in commit ff8ca5fad. Coverity whined about leakage of the
SSLerrmessage() results; I noted the rest in manual code review.
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We used to strategically place newlines after some function call left
parentheses to make pgindent move the argument list a few chars to the
left, so that the whole line would fit under 80 chars. However,
pgindent no longer does that, so the newlines just made the code
vertically longer for no reason. Remove those newlines, and reflow some
of those lines for some extra naturality.
Reviewed-by: Michael Paquier, Tom Lane
Discussion: https://postgr.es/m/20200129200401.GA6303@alvherre.pgsql
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These two new parameters, named sslminprotocolversion and
sslmaxprotocolversion, allow to respectively control the minimum and the
maximum version of the SSL protocol used for the SSL connection attempt.
The default setting is to allow any version for both the minimum and the
maximum bounds, causing libpq to rely on the bounds set by the backend
when negotiating the protocol to use for an SSL connection. The bounds
are checked when the values are set at the earliest stage possible as
this makes the checks independent of any SSL implementation.
Author: Daniel Gustafsson
Reviewed-by: Michael Paquier, Cary Huang
Discussion: https://postgr.es/m/4F246AE3-A7AE-471E-BD3D-C799D3748E03@yesql.se
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Support is out of scope from all the major vendors for these versions
(for example RHEL5 uses a version based on 0.9.8, and RHEL6 uses 1.0.1),
and it created some extra maintenance work. Upstream has stopped
support of 0.9.8 in December 2015 and of 1.0.0 in February 2016.
Since b1abfec, note that the default SSL protocol version set with
ssl_min_protocol_version is TLSv1.2, whose support was added in OpenSSL
1.0.1, so there is no point to enforce ssl_min_protocol_version to TLSv1
in the SSL tests.
Author: Michael Paquier
Reviewed-by: Daniel Gustafsson, Tom Lane
Discussion: https://postgr.es/m/20191205083252.GE5064@paquier.xyz
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Backpatch-through: update all files in master, backpatch legal files through 9.4
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This function is supported down to OpenSSL 0.9.8, which is the oldest
version supported since 593d4e4 (from Postgres 10 onwards), and is used
since e3bdb2d (from 11 onwards). It is defined as a macro from OpenSSL
0.9.8 to 1.0.2, and as a function in 1.1.0 and newer versions. However,
the configure check present is only adapted for functions. So, even if
the code would be able to compile, configure fails to detect the macro,
causing it to be ignored when compiling the code with OpenSSL from 0.9.8
to 1.0.2.
The code needs a configure check as per a364dfa, which has fixed a
compilation issue with a past version of LibreSSL in NetBSD 5.1. On
HEAD, just remove the configure check as the last release of NetBSD 5 is
from 2014 (and we have no more buildfarm members for it). In 11 and 12,
improve the configure logic so as both macros and functions are
correctly detected. This makes NetBSD 5 still work on already-released
branches, but not for 13 onwards.
The patch for HEAD is from me, and Daniel has written the version to use
for the back-branches.
Author: Michael Paquier, Daniel Gustaffson
Reviewed-by: Tom Lane
Discussion: https://postgr.es/m/20191205083252.GE5064@paquier.xyz
Discussion: https://postgr.es/m/98F7F99E-1129-41D8-B86B-FE3B1E286881@yesql.se
Backpatch-through: 11
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This patch providies for support for password protected SSL client
keys in libpq, and for DER format keys, both encrypted and unencrypted.
There is a new connection parameter sslpassword, which is supplied to
the OpenSSL libraries via a callback function. The callback function can
also be set by an application by calling PQgetSSLKeyPassHook(). There is
also a function to retreive the connection setting, PQsslpassword().
Craig Ringer and Andrew Dunstan
Reviewed by: Greg Nancarrow
Discussion: https://postgr.es/m/f7ee88ed-95c4-95c1-d4bf-7b415363ab62@2ndQuadrant.com
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HEAD supports OpenSSL 0.9.8 and newer versions, and this code likely got
forgotten as its surrounding comments mention an incorrect version
number.
Author: Michael Paquier
Reviewed-by: Peter Eisentraut
Discussion: https://postgr.es/m/20190927032311.GB8485@paquier.xyz
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Switch to 2.1 version of pg_bsd_indent. This formats
multiline function declarations "correctly", that is with
additional lines of parameter declarations indented to match
where the first line's left parenthesis is.
Discussion: https://postgr.es/m/CAEepm=0P3FeTXRcU5B2W3jv3PgRVZ-kGUXLGfd42FFhUROO3ug@mail.gmail.com
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pgtls_read_pending is declared to return bool, but what the underlying
SSL_pending function returns is a count of available bytes.
This is actually somewhat harmless if we're using C99 bools, but in
the back branches it's a live bug: if the available-bytes count happened
to be a multiple of 256, it would get converted to a zero char value.
On machines where char is signed, counts of 128 and up could misbehave
as well. The net effect is that when using SSL, libpq might block
waiting for data even though some has already been received.
Broken by careless refactoring in commit 4e86f1b16, so back-patch
to 9.5 where that came in.
Per bug #15802 from David Binderman.
Discussion: https://postgr.es/m/15802-f0911a97f0346526@postgresql.org
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Backpatch-through: certain files through 9.4
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This provides the features that used to exist in useful_strerror()
for users of strerror_r(), too. Also, standardize on the GNU convention
that strerror_r returns a char pointer that may not be NULL.
I notice that libpq's win32.c contains a variant version of strerror_r
that probably ought to be folded into strerror.c. But lacking a
Windows environment, I should leave that to somebody else.
Discussion: https://postgr.es/m/2975.1526862605@sss.pgh.pa.us
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There are some problems with the tls-unique channel binding type. It's not
supported by all SSL libraries, and strictly speaking it's not defined for
TLS 1.3 at all, even though at least in OpenSSL, the functions used for it
still seem to work with TLS 1.3 connections. And since we had no
mechanism to negotiate what channel binding type to use, there would be
awkward interoperability issues if a server only supported some channel
binding types. tls-server-end-point seems feasible to support with any SSL
library, so let's just stick to that.
This removes the scram_channel_binding libpq option altogether, since there
is now only one supported channel binding type.
This also removes all the channel binding tests from the SSL test suite.
They were really just testing the scram_channel_binding option, which
is now gone. Channel binding is used if both client and server support it,
so it is used in the existing tests. It would be good to have some tests
specifically for channel binding, to make sure it really is used, and the
different combinations of a client and a server that support or doesn't
support it. The current set of settings we have make it hard to write such
tests, but I did test those things manually, by disabling
HAVE_BE_TLS_GET_CERTIFICATE_HASH and/or
HAVE_PGTLS_GET_PEER_CERTIFICATE_HASH.
I also removed the SCRAM_CHANNEL_BINDING_TLS_END_POINT constant. This is a
matter of taste, but IMO it's more readable to just use the
"tls-server-end-point" string.
Refactor the checks on whether the SSL library supports the functions
needed for tls-server-end-point channel binding. Now the server won't
advertise, and the client won't choose, the SCRAM-SHA-256-PLUS variant, if
compiled with an OpenSSL version too old to support it.
In the passing, add some sanity checks to check that the chosen SASL
mechanism, SCRAM-SHA-256 or SCRAM-SHA-256-PLUS, matches whether the SCRAM
exchange used channel binding or not. For example, if the client selects
the non-channel-binding variant SCRAM-SHA-256, but in the SCRAM message
uses channel binding anyway. It's harmless from a security point of view,
I believe, and I'm not sure if there are some other conditions that would
cause the connection to fail, but it seems better to be strict about these
things and check explicitly.
Discussion: https://www.postgresql.org/message-id/ec787074-2305-c6f4-86aa-6902f98485a4%40iki.fi
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This includes code comments and documentation. No backpatch as this is
cosmetic even if there are documentation changes which are user-facing.
Author: Daniel Gustafsson
Discussion: https://postgr.es/m/BB89928E-2BC7-489E-A5E4-6D204B3954CF@yesql.se
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Discussion: https://postgr.es/m/15719.1523984266@sss.pgh.pa.us
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Since e3bdb2d92600ed45bd46aaf48309a436a9628218, libpq failed to build on
some platforms because they did not have SSL_clear_options(). Although
mainline OpenSSL introduced SSL_clear_options() after
SSL_OP_NO_COMPRESSION, so the code should have built fine, at least an
old NetBSD version (build farm "coypu" NetBSD 5.1 gcc 4.1.3 PR-20080704
powerpc) has SSL_OP_NO_COMPRESSION but no SSL_clear_options().
So add a configure check for SSL_clear_options(). If we don't find it,
skip the call. That means on such a platform one cannot *enable* SSL
compression if the built-in default is off, but that seems an unlikely
combination anyway and not very interesting in practice.
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Since SSL compression is no longer recommended, turn the default in
libpq from on to off.
OpenSSL 1.1.0 and many distribution packages already turn compression
off by default, so such a server won't accept compression anyway. So
this will mainly affect users of older OpenSSL installations.
Also update the documentation to make clear that this setting is no
longer recommended.
Discussion: https://www.postgresql.org/message-id/flat/595cf3b1-4ffe-7f05-6f72-f72b7afa7993%402ndquadrant.com
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Fix the warnings created by the compiler warning options
-Wformat-overflow=2 -Wformat-truncation=2, supported since GCC 7. This
is a more aggressive variant of the fixes in
6275f5d28a1577563f53f2171689d4f890a46881, which GCC 7 warned about by
default.
The issues are all harmless, but some dubious coding patterns are
cleaned up.
One issue that is of external interest is that BGW_MAXLEN is increased
from 64 to 96. Apparently, the old value would cause the bgw_name of
logical replication workers to be truncated in some circumstances.
But this doesn't actually add those warning options. It appears that
the warnings depend a bit on compilation and optimization options, so it
would be annoying to have to keep up with that. This is more of a
once-in-a-while cleanup.
Reviewed-by: Michael Paquier <michael@paquier.xyz>
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Separate the parts specific to the SSL library from the general logic.
The previous code structure was
open_client_SSL()
calls verify_peer_name_matches_certificate()
calls verify_peer_name_matches_certificate_name()
calls wildcard_certificate_match()
and was completely in fe-secure-openssl.c. The new structure is
open_client_SSL() [openssl]
calls pq_verify_peer_name_matches_certificate() [generic]
calls pgtls_verify_peer_name_matches_certificate_guts() [openssl]
calls openssl_verify_peer_name_matches_certificate_name() [openssl]
calls pq_verify_peer_name_matches_certificate_name() [generic]
calls wildcard_certificate_match() [generic]
Move the generic functions into a new file fe-secure-common.c, so the
calls generally go fe-connect.c -> fe-secure.c -> fe-secure-${impl}.c ->
fe-secure-common.c, although there is a bit of back-and-forth between
the last two.
Reviewed-by: Michael Paquier <michael.paquier@gmail.com>
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Some things in be-secure-openssl.c and fe-secure-openssl.c were not
actually specific to OpenSSL but could also be used by other
implementations. In order to avoid copy-and-pasting, move some of that
code to common files.
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Move the documentation of the SSL API calls are supposed to do into the
headers files, instead of keeping them in the files for the OpenSSL
implementation. That way, they don't have to be duplicated or be
inconsistent when other implementations are added.
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It seems we can't easily work around the lack of
X509_get_signature_nid(), so revert the previous attempts and just
disable the tls-server-end-point feature if we don't have it.
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<openssl/x509.h> is necessary to look into the X509 struct, used by
ac3ff8b1d8f98da38c53a701e6397931080a39cf.
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Apparently, X509_get_signature_nid() is only in fairly new OpenSSL
versions, so use the lower-level interface it is built on instead.
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This adds a second standard channel binding type for SCRAM. It is
mainly intended for third-party clients that cannot implement
tls-unique, for example JDBC.
Author: Michael Paquier <michael.paquier@gmail.com>
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Backpatch-through: certain files through 9.3
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This is the basic feature set using OpenSSL to support the feature. In
order to allow the frontend and the backend to fetch the sent and
expected TLS Finished messages, a PG-like API is added to be able to
make the interface pluggable for other SSL implementations.
This commit also adds a infrastructure to facilitate the addition of
future channel binding types as well as libpq parameters to control the
SASL mechanism names and channel binding names. Those will be added by
upcoming commits.
Some tests are added to the SSL test suite to test SCRAM authentication
with channel binding.
Author: Michael Paquier <michael@paquier.xyz>
Reviewed-by: Peter Eisentraut <peter.eisentraut@2ndquadrant.com>
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