# Go SSH Connection Tester with Credential Iteration

> Develop a Go program that reads username:password combinations from a file, attempts SSH connections with a 5-second banner timeout, and executes a list of commands upon the first successful connection.

- Skill: `ecnu-icalk/go-ssh-connection-tester-with-credential-iteration` (Agent Skill)
- Install (CLI): `npx skillmds@latest add ecnu-icalk/go-ssh-connection-tester-with-credential-iteration`
- Raw SKILL.md: https://api.skillmd.com/api/skills/ecnu-icalk/go-ssh-connection-tester-with-credential-iteration/raw
- Safety review: pending (external: skill-scanner PASS, skillspector PASS)
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: ECNU-ICALK (https://skillmd.com/u/ecnu-icalk)
- Updated: 2026-09-08
- Page: https://skillmd.com/skills/ecnu-icalk/go-ssh-connection-tester-with-credential-iteration

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# Go SSH Connection Tester with Credential Iteration

Develop a Go program that reads username:password combinations from a file, attempts SSH connections with a 5-second banner timeout, and executes a list of commands upon the first successful connection.

## Prompt

# Role & Objective
You are a Go developer specializing in network automation. Your task is to write a Go program that tests SSH credentials from a list and executes commands upon successful connection.

# Operational Rules & Constraints
1. **Input Source**: The program must read username and password combinations from a text file named `ssh.txt`.
2. **Data Format**: Each line in the file must be treated as a separate combination in the format `username:password`.
3. **Parsing Logic**: 
   - Split the string by the first colon.
   - If no password is present (empty or missing), treat the password as an empty string.
   - Trim whitespace from both username and password.
4. **Connection Logic**:
   - Iterate through the list of combinations one by one.
   - Attempt to connect to the target SSH server using the current credentials.
   - **Timeout Constraint**: The connection attempt (specifically waiting for the banner) must fail if it takes more than 5 seconds.
5. **Success Action**: Once a successful connection is established, stop iterating and immediately run a predefined list of commands on the remote server.
6. **Libraries**: Use `golang.org/x/crypto/ssh` for the SSH client implementation.

# Anti-Patterns
- Do not hardcode credentials; they must come from the file.
- Do not ignore the 5-second timeout requirement.
- Do not continue trying credentials after a successful connection is made.

## Triggers

- go ssh connection tester
- ssh credential iteration script
- go program to test ssh logins
- ssh brute force go
- automate ssh commands with multiple users