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From OpenSSH 8.8p1's release notes: --- Potentially-incompatible changes ================================ This release disables RSA signatures using the SHA-1 hash algorithm by default. This change has been made as the SHA-1 hash algorithm is cryptographically broken, and it is possible to create chosen-prefix hash collisions for <USD$50K [1] For most users, this change should be invisible and there is no need to replace ssh-rsa keys. OpenSSH has supported RFC8332 RSA/SHA-256/512 signatures since release 7.2 and existing ssh-rsa keys will automatically use the stronger algorithm where possible. Incompatibility is more likely when connecting to older SSH implementations that have not been upgraded or have not closely tracked improvements in the SSH protocol. For these cases, it may be necessary to selectively re-enable RSA/SHA1 to allow connection and/or user authentication via the HostkeyAlgorithms and PubkeyAcceptedAlgorithms options. For example, the following stanza in ~/.ssh/config will enable RSA/SHA1 for host and user authentication for a single destination host: Host old-host HostkeyAlgorithms +ssh-rsa PubkeyAcceptedAlgorithms +ssh-rsa We recommend enabling RSA/SHA1 only as a stopgap measure until legacy implementations can be upgraded or reconfigured with another key type (such as ECDSA or Ed25519). [1] "SHA-1 is a Shambles: First Chosen-Prefix Collision on SHA-1 and Application to the PGP Web of Trust" Leurent, G and Peyrin, T (2020) https://eprint.iacr.org/2020/014.pdf --- Relnotes: Yes Sponsored by: The FreeBSD Foundation
Overview. $ ./configure && make tests You'll see some progress info. A failure will cause either the make to abort or the driver script to report a "FATAL" failure. The test consists of 2 parts. The first is the file-based tests which is driven by the Makefile, and the second is a set of network or proxycommand based tests, which are driven by a driver script (test-exec.sh) which is called multiple times by the Makefile. Failures in the first part will cause the Makefile to return an error. Failures in the second part will print a "FATAL" message for the failed test and continue. OpenBSD has a system-wide regression test suite. OpenSSH Portable's test suite is based on OpenBSD's with modifications. Environment variables. SKIP_UNIT: Skip unit tests. SUDO: path to sudo/doas command, if desired. Note that some systems (notably systems using PAM) require sudo to execute some tests. LTESTS: Whitespace separated list of tests (filenames without the .sh extension) to run. SKIP_LTESTS: Whitespace separated list of tests to skip. OBJ: used by test scripts to access build dir. TEST_SHELL: shell used for running the test scripts. TEST_SSH_FAIL_FATAL: set to "yes" to make any failure abort the test currently in progress. TEST_SSH_PORT: TCP port to be used for the listening tests. TEST_SSH_QUIET: set to "yes" to suppress non-fatal output. TEST_SSH_SSHD_CONFOPTS: Configuration directives to be added to sshd_config before running each test. TEST_SSH_SSH_CONFOPTS: Configuration directives to be added to ssh_config before running each test. TEST_SSH_TRACE: set to "yes" for verbose output from tests TEST_SSH_x: path to "ssh" command under test, where x is one of SSH, SSHD, SSHAGENT, SSHADD, SSHKEYGEN, SSHKEYSCAN, SFTP or SFTPSERVER USE_VALGRIND: Run the tests under valgrind memory checker. Individual tests. You can run an individual test from the top-level Makefile, eg: $ make tests LTESTS=agent-timeout If you need to manipulate the environment more you can invoke test-exec.sh directly if you set up the path to find the binaries under test and the test scripts themselves, for example: $ cd regress $ PATH=`pwd`/..:$PATH:. TEST_SHELL=/bin/sh sh test-exec.sh `pwd` \ agent-timeout.sh ok agent timeout test Files. test-exec.sh: the main test driver. Sets environment, creates config files and keys and runs the specified test. At the time of writing, the individual tests are: connect.sh: simple connect proxy-connect.sh: proxy connect connect-privsep.sh: proxy connect with privsep connect-uri.sh: uri connect proto-version.sh: sshd version with different protocol combinations proto-mismatch.sh: protocol version mismatch exit-status.sh: remote exit status envpass.sh: environment passing transfer.sh: transfer data banner.sh: banner rekey.sh: rekey stderr-data.sh: stderr data transfer stderr-after-eof.sh: stderr data after eof broken-pipe.sh: broken pipe test try-ciphers.sh: try ciphers yes-head.sh: yes pipe head login-timeout.sh: connect after login grace timeout agent.sh: simple connect via agent agent-getpeereid.sh: disallow agent attach from other uid agent-timeout.sh: agent timeout test agent-ptrace.sh: disallow agent ptrace attach keyscan.sh: keyscan keygen-change.sh: change passphrase for key keygen-convert.sh: convert keys keygen-moduli.sh: keygen moduli key-options.sh: key options scp.sh: scp scp-uri.sh: scp-uri sftp.sh: basic sftp put/get sftp-chroot.sh: sftp in chroot sftp-cmds.sh: sftp command sftp-badcmds.sh: sftp invalid commands sftp-batch.sh: sftp batchfile sftp-glob.sh: sftp glob sftp-perm.sh: sftp permissions sftp-uri.sh: sftp-uri ssh-com-client.sh: connect with ssh.com client ssh-com-keygen.sh: ssh.com key import ssh-com-sftp.sh: basic sftp put/get with ssh.com server ssh-com.sh: connect to ssh.com server reconfigure.sh: simple connect after reconfigure dynamic-forward.sh: dynamic forwarding forwarding.sh: local and remote forwarding multiplex.sh: connection multiplexing reexec.sh: reexec tests brokenkeys.sh: broken keys sshcfgparse.sh: ssh config parse cfgparse.sh: sshd config parse cfgmatch.sh: sshd_config match cfgmatchlisten.sh: sshd_config matchlisten addrmatch.sh: address match localcommand.sh: localcommand forcecommand.sh: forced command portnum.sh: port number parsing keytype.sh: login with different key types kextype.sh: login with different key exchange algorithms cert-hostkey.sh certified host keys cert-userkey.sh: certified user keys host-expand.sh: expand %h and %n keys-command.sh: authorized keys from command forward-control.sh: sshd control of local and remote forwarding integrity.sh: integrity krl.sh: key revocation lists multipubkey.sh: multiple pubkey limit-keytype.sh: restrict pubkey type hostkey-agent.sh: hostkey agent keygen-knownhosts.sh: ssh-keygen known_hosts hostkey-rotate.sh: hostkey rotate principals-command.sh: authorized principals command cert-file.sh: ssh with certificates cfginclude.sh: config include allow-deny-users.sh: AllowUsers/DenyUsers authinfo.sh: authinfo Problems? Run the failing test with shell tracing (-x) turned on: $ PATH=`pwd`/..:$PATH:. sh -x test-exec.sh `pwd` agent-timeout.sh Failed tests can be difficult to diagnose. Suggestions: - run the individual test via ./test-exec.sh `pwd` [testname] - set LogLevel to VERBOSE in test-exec.sh and enable syslogging of auth.debug (eg to /var/log/authlog). Known Issues. - Similarly, if you do not have "scp" in your system's $PATH then the multiplex scp tests will fail (since the system's shell startup scripts will determine where the shell started by sshd will look for scp). - Recent GNU coreutils deprecate "head -[n]": this will cause the yes-head test to fail. The old behaviour can be restored by setting (and exporting) _POSIX2_VERSION=199209 before running the tests.