TACACSPLUS_PASSKEY_ENCRYPTION support Part - I

[nmoray]

• What I did Added a support of TACACS passkey encryption feature. Ref. : HLD This PR comprises the encryption logic.

• How I did it Implemented the feature by following HLD

• How to verify it `1. Configured TACACS passkey: root@sonic:/# config tacacs passkey

2. Verified whether passkey is encrypted: root@sonic:/# show runningconfiguration all | grep passkey "passkey": "U2FsdGVkX19kFwDeP3IhgqbLJeed3pXtazJ73FtmD3I="

3. Verified /etc/pam.d/common-auth-sonic file to validate if the passkey is decrypted correctly [Referred while ssh'ing into the device] root@sonic:~# cat /etc/pam.d/common-auth-sonic | grep secret auth [success=done new_authtok_reqd=done default=ignore auth_err=die] pam_tacplus.so server=:49 secret=<pass_in_plaintext> login=login timeout=5 try_first_pass auth [success=done new_authtok_reqd=done default=ignore auth_err=die] pam_tacplus.so server=:49 secret=<pass_in_plaintext> login=login timeout=5 try_first_pass

4. Verified passkey is hidden in show tacacs output root@sonic:~# show tacacs TACPLUS global auth_type pap (default) TACPLUS global timeout 5 (default) TACPLUS global passkey configured Yes

5. Verified user able to login into device with TACACS credentials`

• Related PR(s) PR#81

[madhupalu]

@nmoray please take care of unit test coverage for PR to be approved.

[liuh-80]

@nmoray , please fix coverage issue by add new test case:

@azure-pipelines-wrapper coverage.Azure.sonic-utilities.Python3 — Pull Request Coverage

Total: 44 lines Missing: 39 lines Coverage: 11% Threshold: 80%

[nmoray]

@nmoray , please fix coverage issue by add new test case:

@azure-pipelines-wrapper coverage.Azure.sonic-utilities.Python3 — Pull Request Coverage

Total: 44 lines Missing: 39 lines Coverage: 11% Threshold: 80%

@liuh-80 can you please give me some pointers for better understanding of this AUT infra. Like, how to write a new testcase.

[liuh-80]

@nmoray , please fix coverage issue by add new test case: @azure-pipelines-wrapper coverage.Azure.sonic-utilities.Python3 — Pull Request Coverage Total: 44 lines Missing: 39 lines Coverage: 11% Threshold: 80%

@liuh-80 can you please give me some pointers for better understanding of this AUT infra. Like, how to write a new testcase.

You can find existing test case and add new test case here: https://github.com/sonic-net/sonic-utilities/blob/master/tests/aaa_test.py

[zhangyanzhao]

Reviewers, if you are ok with this PR, please help to approve it. Thanks.