1*** Settings ***
2Documentation    Test BMC SSH security.
3
4Resource         ../lib/resource.robot
5Resource         ../lib/openbmc_ffdc_methods.robot
6
7*** Variables ***
8
9@{allowed_shell_rcs}   ${255}
10${ignore_err}          ${0}
11
12# Left anchor for this regex is either a space or a comma.
13${left_anchor}         [ ,]
14# Right anchor for this regex is either a comma or end-of-line.
15${right_anchor}        (,|$)
16
17${weak_key_regex}   ${left_anchor}(group1_sha1|DES-CBC3|CBC mode|group1|SHA1)${right_anchor}
18${mac_key_regex}    ${left_anchor}(MD5|96-bit MAC algorithms)${right_anchor}
19
20*** Test Cases ***
21
22Verify BMC SSH Weak Cipher And Algorithm
23    [Documentation]  Connect to BMC and verify no weak cipher and algorithm is
24    ...              supported.
25    [Tags]  Verify_BMC_SSH_Weak_Cipher_And_Algorithm
26
27    # The following is a sample of output from ssh -vv:
28    # This test requires OpenSSH and depends on output format of ssh -vv.
29    # debug2: KEX algorithms: curve25519-sha256,curve25519-sha256@libssh.org,ecdh-sha2-nistp256,
30    #         ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,
31    #         diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,diffie-hellman-group14-sha256,
32    #         diffie-hellman-group14-sha1
33    # debug2: host key algorithms: rsa-sha2-512,rsa-sha2-256,ssh-rsa
34    # debug2: ciphers ctos: chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,
35    #         aes128-gcm@openssh.com,aes256-gcm@openssh.com
36    # debug2: ciphers stoc: chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,
37    #         aes128-gcm@openssh.com,aes256-gcm@openssh.com
38    # debug2: MACs ctos: umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,
39    #         hmac-sha2-512-etm@openssh.com,hmac-sha1-etm@openssh.com,
40    #         umac-64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1
41    # debug2: MACs stoc: umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,
42    #         hmac-sha2-512-etm@openssh.com,hmac-sha1-etm@openssh.com,
43    #         umac-64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1
44
45    # Example of weak algorithms to check:
46    # - encryption: triple-DES ("DES-CBC3").
47    # - encryption: CBC mode
48    # - MAC: MD5 and 96-bit MAC algorithms
49    # - KEX: diffie-hellman-group1(any) , (any) SHA1
50
51    Printn
52    ${ssh_cmd_buf}=  Catenate  ssh -o NumberOfPasswordPrompts=0 -o UserKnownHostsFile=/dev/null
53    ...  -o StrictHostKeyChecking=no -vv ${OPENBMC_HOST} 2>&1
54
55    ${rc}  ${std_err}=  Shell Cmd  ! ${ssh_cmd_buf}
56    Log  std_err=${std_err}  console=yes
57    Log  rc=${rc} console=yes
58
59    ${has_it}=  Run Keyword And Return Status  Should Contain  ${std_err}  Permission denied
60    Skip If  not ${has_it}
61    ...  Skipping test case since response is not as expected
62
63    Shell Cmd  ! ${ssh_cmd_buf} | egrep -- "${weak_key_regex}"
64    Shell Cmd  ! ${ssh_cmd_buf} | egrep -- "${mac_key_regex}"
65