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Support for TCP wrappers was dropped in OpenSSH 6.7. See this message
and thread:
https://lists.mindrot.org/pipermail/openssh-unix-dev/2014-April/032497.html
It is true that this reduces preauth attack surface in sshd. On the
other hand, this support seems to be quite widely used, and abruptly
dropping it (from the perspective of users who don't read
openssh-unix-dev) could easily cause more serious problems in practice.
It's not entirely clear what the right long-term answer for Debian is,
but it at least probably doesn't involve dropping this feature shortly
before a freeze.
Forwarded: not-needed
Last-Update: 2018-08-24
Patch-Name: restore-tcp-wrappers.patch
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This patch has been rejected upstream: "None of the OpenSSH developers are
in favour of adding this, and this situation has not changed for several
years. This is not a slight on Simon's patch, which is of fine quality, but
just that a) we don't trust GSSAPI implementations that much and b) we don't
like adding new KEX since they are pre-auth attack surface. This one is
particularly scary, since it requires hooks out to typically root-owned
system resources."
However, quite a lot of people rely on this in Debian, and it's better to
have it merged into the main openssh package rather than having separate
-krb5 packages (as we used to have). It seems to have a generally good
security history.
Bug: https://bugzilla.mindrot.org/show_bug.cgi?id=1242
Last-Updated: 2018-08-24
Patch-Name: gssapi.patch
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Cygwin's latest 7.x GCC allows to specify -mfunction-return=thunk
as well as -mindirect-branch=thunk on the command line, albeit
producing invalid code, leading to an error at link stage.
The check in configure.ac only checks if the option is present,
but not if it produces valid code.
This patch fixes it by special-casing Cygwin. Another solution
may be to change these to linker checks.
Signed-off-by: Corinna Vinschen <vinschen@redhat.com>
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Most people will 1) be using modern multi-factor authentication methods
like TOTP/OATH etc and 2) be getting support for multi-factor
authentication via PAM or BSD Auth.
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Add getline for the benefit of platforms that don't have it. Sourced
from NetBSD (OpenBSD's implementation is a little too chummy with the
internals of FILE).
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Since autoconf always uses $CC to link C programs, allowing users to
override LD caused mismatches between what LD_LINK_IFELSE thought worked
and what ld thought worked. If you do need to do this kind of thing you
need to set a compiler flag such as gcc's -fuse-ld in LDFLAGS.
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Patch from rsbecker at nexbridge.com.
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Only applies when built --without-openssl. Thanks Jann Horn for
reminder.
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Spotted using https://github.com/lucasdemarchi/codespell
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On at least some revisions of AIX, strndup returns unterminated strings
under some conditions, apparently because strnlen returns incorrect
values in those cases. Disable both on AIX and use the replacements
from openbsd-compat. Fixes problem with ECDSA keys there, ok djm.
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The recently added MIPS ABI tests need AC_LANG_PROGRAM to prevent
warnings from autoconf. Pointed out by klausz at haus-gisela.de.
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Currently seccomp_audit_arch is set to AUDIT_ARCH_MIPS64 or
AUDIT_ARCH_MIPSEL64 (depending on the endinness) when openssh is built
for MIPS64. However, that's only valid for n64 ABI. The right macros for
n32 ABI defined in seccomp.h are AUDIT_ARCH_MIPS64N32 and
AUDIT_ARCH_MIPSEL64N32, for big and little endian respectively.
Because of that an sshd built for MIPS64 n32 rejects connection attempts
and the output of strace reveals that the problem is related to seccomp
audit:
[pid 194] prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, {len=57,
filter=0x555d5da0}) = 0
[pid 194] write(7, "\0\0\0]\0\0\0\5\0\0\0Ulist_hostkey_types: "..., 97) = ?
[pid 193] <... poll resumed> ) = 2 ([{fd=5, revents=POLLIN|POLLHUP},
{fd=6, revents=POLLHUP}])
[pid 194] +++ killed by SIGSYS +++
This patch fixes that problem by setting the right value to
seccomp_audit_arch taking into account the MIPS64 ABI.
Signed-off-by: Vicente Olivert Riera <Vincent.Riera@imgtec.com>
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Signed-off-by: Vicente Olivert Riera <Vincent.Riera@imgtec.com>
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Some really old platforms (eg SunOS4) segfault on fflush(NULL) so check
for and work around. With klausz at haus-gisela.de.
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Some platforms don't have strndup, which includes Solaris 10, NetBSD 3
and FreeBSD 6.
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Some compilers (gcc 2.9.53, 3.0 and probably others, see gcc bug #3481)
do not accept __attribute__ on function pointer prototype args. Check for
this and hide them if they're not accepted.
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Also a couple of minor changes: fail if we can't lock instead of
silently succeeding, and apply a couple of minor style fixes.
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AC_FUNC_GETPGRP tests if getpgrp(0) works, which it does if it's not
declared. Instead, test if the zero-arg version we want to use works.
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Configure assumes that if malloc(0) returns null then calloc(0,n)
also does. On some old platforms (SunOS4) malloc behaves as expected
(as determined by AC_FUNC_MALLOC) but calloc doesn't. Test for this
at configure time and activate the replacement function if found, plus
handle this case in rpl_calloc.
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Since explicit_bzero uses it via an indirect it needs to be a function
not just a macro.
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BindInterface required getifaddr and friends so disable if not available
(eg Solaris 10). We should be able to add support for some systems with
a bit more work but this gets the building again.
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On some older platforms (at least sunos4, probably others) sys/audit.h
requires some other headers. Patch from klausz at haus-gisela.de.
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getrusage was used in ssh-rand-helper but that's now long gone.
Patch from klauszh at haus-gisela.de.
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The code required to support it is quite invasive to the mainline
code that is synced with upstream and is an ongoing maintenance burden.
Both the hardware and software are literal museum pieces these days and
we could not find anyone still running OpenSSH on one.
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Prevents configure-time "present but cannot be compiled" warning.
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This adds checks for gcc and clang flags for mitigations for Spectre
variant 2, ie "retpoline". It'll automatically enabled if the compiler
supports it as part of toolchain hardening flag. ok djm@
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The configure checks that populated $SCARD_MSG were removed in commits
7ea845e4 and d8f60022 when the smartcard support was replaced with
PKCS#11.
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Adds a .depend file containing dependency information generated by
makedepend, which is appended to the generated Makefile by configure.
You can regen the file with "make -f Makefile.in depend" if necessary,
but we'll be looking at some way to automatically keep this up to date.
"no objection" djm@
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When ldns-config is not found, configure would check the wrong variable.
ok djm@
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Check for MIKDIR_P and use it instead of mkinstalldirs. Should fix "mkdir:
cannot create directory:... File exists" during "make install".
Patch from eb at emlix.com.
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musl libc doesn't seem to have linux/if.h, so check for its presence
before enabling rdomain support on Linux.
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On at least older OpenBSDs, sys/sysctl.h and net/route.h require
sys/types and, in the case of sys/sysctl.h, sys/param.h for MAXLOGNAME.
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We don't support openssl-1.1.x yet (see multiple threads on the
openssh-unix-dev@ mailing list for the reason), but previously
./configure would accept it and the compilation would subsequently
fail. This makes ./configure display an explicit error message and
abort.
ok dtucker@
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On some platforms (AIX, maybe others) allocating zero bytes of memory
via the various *alloc functions returns NULL, which is permitted
by the standards. Autoconf has some macros for detecting this (with
the exception of calloc for some reason) so use these and if necessary
activate shims for them. ok djm@
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