summaryrefslogtreecommitdiff
path: root/sshd.c
AgeCommit message (Collapse)Author
2020-10-18Add systemd readiness notification supportMichael Biebl
Bug-Debian: https://bugs.debian.org/778913 Forwarded: no Last-Update: 2017-08-22 Patch-Name: systemd-readiness.patch
2020-10-18Add DebianBanner server configuration optionKees Cook
Setting this to "no" causes sshd to omit the Debian revision from its initial protocol handshake, for those scared by package-versioning.patch. Bug-Debian: http://bugs.debian.org/562048 Forwarded: not-needed Last-Update: 2020-06-07 Patch-Name: debian-banner.patch
2020-10-18Handle SELinux authorisation rolesManoj Srivastava
Rejected upstream due to discomfort with magic usernames; a better approach will need an SSH protocol change. In the meantime, this came from Debian's SELinux maintainer, so we'll keep it until we have something better. Bug: https://bugzilla.mindrot.org/show_bug.cgi?id=1641 Bug-Debian: http://bugs.debian.org/394795 Last-Update: 2020-10-18 Patch-Name: selinux-role.patch
2020-10-18Restore TCP wrappers supportColin Watson
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: 2019-06-05 Patch-Name: restore-tcp-wrappers.patch
2020-10-18GSSAPI key exchange supportSimon Wilkinson
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. Author: Simon Wilkinson <simon@sxw.org.uk> Author: Colin Watson <cjwatson@debian.org> Author: Jakub Jelen <jjelen@redhat.com> Origin: other, https://github.com/openssh-gsskex/openssh-gsskex/commits/debian/master Bug: https://bugzilla.mindrot.org/show_bug.cgi?id=1242 Last-Updated: 2020-06-07 Patch-Name: gssapi.patch
2020-08-27upstream: support for user-verified FIDO keysdjm@openbsd.org
FIDO2 supports a notion of "user verification" where the user is required to demonstrate their identity to the token before particular operations (e.g. signing). Typically this is done by authenticating themselves using a PIN that has been set on the token. This adds support for generating and using user verified keys where the verification happens via PIN (other options might be added in the future, but none are in common use now). Practically, this adds another key generation option "verify-required" that yields a key that requires a PIN before each authentication. feedback markus@ and Pedro Martelletto; ok markus@ OpenBSD-Commit-ID: 57fd461e4366f87c47502c5614ec08573e6d6a15
2020-07-15upstream: update setproctitle after re-exec; ok djmmarkus@openbsd.org
OpenBSD-Commit-ID: bc92d122f9184ec2a9471ade754b80edd034ce8b
2020-07-15upstream: keep ignoring HUP after fork+exec; ok djmmarkus@openbsd.org
OpenBSD-Commit-ID: 7679985a84ee5ceb09839905bb6f3ddd568749a2
2020-07-15upstream: don't exit the listener on send_rexec_state errors; okmarkus@openbsd.org
djm OpenBSD-Commit-ID: 57cbd757d130d3f45b7d41310b3a15eeec137d5c
2020-06-19upstream: check public host key matches private; ok markus@ (asdjm@openbsd.org
part of previous diff) OpenBSD-Commit-ID: 65a4f66436028748b59fb88b264cb8c94ce2ba63
2020-06-05upstream: unbreak "sshd -ddd" - close of config passing fd happened toodjm@openbsd.org
early. ok markus@ OpenBSD-Commit-ID: 49346e945c6447aca3e904e65fc400128d2f8ed0
2020-05-27upstream: improve logging for MaxStartups connection throttling:djm@openbsd.org
have sshd log when it starts and stops throttling and periodically while in this state. bz#3055 ok markus@ OpenBSD-Commit-ID: 2e07a09a62ab45d790d3d2d714f8cc09a9ac7ab9
2020-05-27upstream: sshd listener must not block if reexecd sshd exitsmarkus@openbsd.org
in write(2) on config_s[0] if the forked child exits early before finishing recv_rexec_state (e.g. with fatal()) because config_s[1] stays open in the parent. this prevents the parent from accepting new connections. ok djm, deraadt OpenBSD-Commit-ID: 92ccfeb939ccd55bda914dc3fe84582158c4a9ef
2020-05-27upstream: fix compilation with DEBUG_KEXDH; bz#3160 ok dtucker@djm@openbsd.org
OpenBSD-Commit-ID: 832e771948fb45f2270e8b8895aac36d176ba17a
2020-03-14upstream: use sshpkt_fatal() for kex_exchange_identification()djm@openbsd.org
errors. This ensures that the logged errors are consistent with other transport- layer errors and that the relevant IP addresses are logged. bz3129 ok dtucker@ OpenBSD-Commit-ID: 2c22891f0b9e1a6cd46771cedbb26ac96ec2e6ab
2020-03-14upstream: Don't clear alarm timers in listening sshd. Previouslydtucker@openbsd.org
these timers were used for regenerating the SSH1 ephemeral host keys but those are now gone so there's no need to clear the timers either. ok deraadt@ OpenBSD-Commit-ID: 280d2b885e4a1ce404632e8cc38fcb17be7dafc0
2020-03-14upstream: spelling errors in comments; no code change fromdjm@openbsd.org
OpenBSD-Commit-ID: 166ea64f6d84f7bac5636dbd38968592cb5eb924
2020-02-01upstream: whitespacedjm@openbsd.org
OpenBSD-Commit-ID: 564cf7a5407ecf5da2d94ec15474e07427986772
2020-02-01upstream: force early logging to stderr if debug_flag (-d) is set;djm@openbsd.org
avoids missing messages from re-exec config passing OpenBSD-Commit-ID: 02484b8241c1f49010e7a543a7098e6910a8c9ff
2020-02-01upstream: mistake in previous: filling the incorrect bufferdjm@openbsd.org
OpenBSD-Commit-ID: 862ee84bd4b97b529f64aec5d800c3dcde952e3a
2020-02-01upstream: Add a sshd_config "Include" directive to allow inclusiondjm@openbsd.org
of files. This has sensible semantics wrt Match blocks and accepts glob(3) patterns to specify the included files. Based on patch by Jakub Jelen in bz2468; feedback and ok markus@ OpenBSD-Commit-ID: 36ed0e845b872e33f03355b936a4fff02d5794ff
2020-01-25upstream: tweak proctitle to include sshd arguments, as these aredjm@openbsd.org
frequently used to distinguish between multiple independent instances of the server. New proctitle looks like this: $ pgrep -lf sshd 12844 sshd: /usr/sbin/sshd -f /etc/ssh/sshd_config [listener] 0 of 10-100 startups requested by sthen@ and aja@; ok aja@ OpenBSD-Commit-ID: cf235a561c655a3524a82003cf7244ecb48ccc1e
2020-01-23upstream: Replace all calls to signal(2) with a wrapper arounddtucker@openbsd.org
sigaction(2). This wrapper blocks all other signals during the handler preventing races between handlers, and sets SA_RESTART which should reduce the potential for short read/write operations. OpenBSD-Commit-ID: 5e047663fd77a40d7b07bdabe68529df51fd2519
2020-01-22upstream: expose the number of currently-authenticating connectionsdjm@openbsd.org
along with the MaxStartups limit in the proctitle; suggestion from Philipp Marek, w/ feedback from Craig Miskell ok dtucker@ OpenBSD-Commit-ID: a4a6db2dc1641a5df8eddf7d6652176e359dffb3
2020-01-22remove accidental change in f8c11461Damien Miller
2020-01-21upstream: pass SSH_SK_HELPER explicitly past $SUDO to avoid it gettingdjm@openbsd.org
cleared; with dtucker@ OpenBSD-Regress-ID: 03178a0580324bf0dff28f7eac6c3edbc5407f8e
2019-12-16upstream: allow security keys to act as host keys as well as userdjm@openbsd.org
keys. Previously we didn't do this because we didn't want to expose the attack surface presented by USB and FIDO protocol handling, but now that this is insulated behind ssh-sk-helper there is less risk. ok markus@ OpenBSD-Commit-ID: 77b068dd133b8d87e0f010987bd5131e640ee64c
2019-11-20upstream: additional missing stdarg.h includes when built withoutnaddy@openbsd.org
WITH_OPENSSL; ok djm@ OpenBSD-Commit-ID: 881f9a2c4e2239849cee8bbf4faec9bab128f55b
2019-11-15upstream: When clients get denied by MaxStartups, send adtucker@openbsd.org
noification prior to the SSH2 protocol banner according to RFC4253 section 4.2. ok djm@ deraadt@ markus@ OpenBSD-Commit-ID: e5dabcb722d54dea18eafb336d50b733af4f9c63
2019-11-01upstream: Refactor signing - use sshkey_sign for everything,djm@openbsd.org
including the new U2F signatures. Don't use sshsk_ecdsa_sign() directly, instead make it reachable via sshkey_sign() like all other signature operations. This means that we need to add a provider argument to sshkey_sign(), so most of this change is mechanically adding that. Suggested by / ok markus@ OpenBSD-Commit-ID: d5193a03fcfa895085d91b2b83d984a9fde76c8c
2019-10-29upstream: Signal handler cleanup: remove leftover support fordtucker@openbsd.org
unreliable signals and now-unneeded save and restore of errno. ok deraadt@ markus@ OpenBSD-Commit-ID: 01dd8a1ebdd991c8629ba1f5237283341a93cd88
2019-07-05upstream: When system calls indicate an error they return -1, notderaadt@openbsd.org
some arbitrary value < 0. errno is only updated in this case. Change all (most?) callers of syscalls to follow this better, and let's see if this strictness helps us in the future. OpenBSD-Commit-ID: 48081f00db7518e3b712a49dca06efc2a5428075
2019-06-21upstream: Add protection for private keys at rest in RAM againstdjm@openbsd.org
speculation and memory sidechannel attacks like Spectre, Meltdown, Rowhammer and Rambleed. This change encrypts private keys when they are not in use with a symmetic key that is derived from a relatively large "prekey" consisting of random data (currently 16KB). Attackers must recover the entire prekey with high accuracy before they can attempt to decrypt the shielded private key, but the current generation of attacks have bit error rates that, when applied cumulatively to the entire prekey, make this unlikely. Implementation-wise, keys are encrypted "shielded" when loaded and then automatically and transparently unshielded when used for signatures or when being saved/serialised. Hopefully we can remove this in a few years time when computer architecture has become less unsafe. been in snaps for a bit already; thanks deraadt@ ok dtucker@ deraadt@ OpenBSD-Commit-ID: 19767213c312e46f94b303a512ef8e9218a39bd4
2019-06-08upstream: Replace calls to ssh_malloc_init() by a static init ofotto@openbsd.org
malloc_options. Prepares for changes in the way malloc is initialized. ok guenther@ dtucker@ OpenBSD-Commit-ID: 154f4e3e174f614b09f792d4d06575e08de58a6b
2019-05-08upstream: When running sshd -T, assume any attibute not provided bydtucker@openbsd.org
-C does not match, which allows it to work when sshd_config contains a Match directive with or without -C. bz#2858, ok djm@ OpenBSD-Commit-ID: 1a701f0a33e3bc96753cfda2fe0b0378520b82eb
2019-03-01upstream: Fix two race conditions in sshd relating to SIGHUP:djm@openbsd.org
1. Recently-forked child processes will briefly remain listening to listen_socks. If the main server sshd process completes its restart via execv() before these sockets are closed by the child processes then it can fail to listen at the desired addresses/ports and/or fail to restart. 2. When a SIGHUP is received, there may be forked child processes that are awaiting their reexecution state. If the main server sshd process restarts before passing this state, these child processes will yield errors and use a fallback path of reading the current sshd_config from the filesystem rather than use the one that sshd was started with. To fix both of these cases, we reuse the startup_pipes that are shared between the main server sshd and forked children. Previously this was used solely to implement tracking of pre-auth child processes for MaxStartups, but this extends the messaging over these pipes to include a child->parent message that the parent process is safe to restart. This message is sent from the child after it has completed its preliminaries: closing listen_socks and receiving its reexec state. bz#2953, reported by Michal Koutný; ok markus@ dtucker@ OpenBSD-Commit-ID: 7df09eacfa3ce13e9a7b1e9f17276ecc924d65ab
2019-01-21upstream: rename kex->kem_client_pub -> kex->client_pub now thatdjm@openbsd.org
KEM has been renamed to kexgen from markus@ ok djm@ OpenBSD-Commit-ID: fac6da5dc63530ad0da537db022a9a4cfbe8bed8
2019-01-21upstream: use KEM API for vanilla ECDHdjm@openbsd.org
from markus@ ok djm@ OpenBSD-Commit-ID: 6fbff96339a929835536b5730585d1d6057a352c
2019-01-21upstream: use KEM API for vanilla DH KEXdjm@openbsd.org
from markus@ ok djm@ OpenBSD-Commit-ID: af56466426b08a8be275412ae2743319e3d277c9
2019-01-21upstream: use KEM API for vanilla c25519 KEXdjm@openbsd.org
OpenBSD-Commit-ID: 38d937b85ff770886379dd66a8f32ab0c1c35c1f
2019-01-21upstream: Add support for a PQC KEX/KEM:djm@openbsd.org
sntrup4591761x25519-sha512@tinyssh.org using the Streamlined NTRU Prime 4591^761 implementation from SUPERCOP coupled with X25519 as a stop-loss. Not enabled by default. introduce KEM API; a simplified framework for DH-ish KEX methods. from markus@ feedback & ok djm@ OpenBSD-Commit-ID: d687f76cffd3561dd73eb302d17a1c3bf321d1a7
2019-01-20last bits of old packet API / active_state globalDamien Miller
2019-01-20upstream: remove last references to active_statedjm@openbsd.org
with & ok markus@ OpenBSD-Commit-ID: 78619a50ea7e4ca2f3b54d4658b3227277490ba2
2019-01-20upstream: convert monitor.c to new packet APIdjm@openbsd.org
with & ok markus@ OpenBSD-Commit-ID: 61ecd154bd9804461a0cf5f495a29d919e0014d5
2019-01-20upstream: convert sshd.c to new packet APIdjm@openbsd.org
with & ok markus@ OpenBSD-Commit-ID: ea569d3eaf9b5cf1bad52779fbfa5fa0b28af891
2019-01-20upstream: convert auth2.c to new packet APIDamien Miller
OpenBSD-Commit-ID: ed831bb95ad228c6791bc18b60ce7a2edef2c999
2019-01-20upstream: convert servconf.c to new packet APIdjm@openbsd.org
with & ok markus@ OpenBSD-Commit-ID: 126553aecca302c9e02fd77e333b9cb217e623b4
2019-01-20upstream: begin landing remaining refactoring of packet parsingdjm@openbsd.org
API, started almost exactly six years ago. This change stops including the old packet_* API by default and makes each file that requires the old API include it explicitly. We will commit file-by-file refactoring to remove the old API in consistent steps. with & ok markus@ OpenBSD-Commit-ID: 93c98a6b38f6911fd1ae025a1ec57807fb4d4ef4
2019-01-17upstream: many of the global variables in this file can be made static;djm@openbsd.org
patch from Markus Schmidt OpenBSD-Commit-ID: f3db619f67beb53257b21bac0e92b4fb7d5d5737
2018-12-27upstream: move client/server SSH-* banners to buffers underdjm@openbsd.org
ssh->kex and factor out the banner exchange. This eliminates some common code from the client and server. Also be more strict about handling \r characters - these should only be accepted immediately before \n (pointed out by Jann Horn). Inspired by a patch from Markus Schmidt. (lots of) feedback and ok markus@ OpenBSD-Commit-ID: 1cc7885487a6754f63641d7d3279b0941890275b
generated by cgit v1.2.3 (git 2.39.1) at 2024-06-02 14:35:06 +0000