0bb59bf9c2
Add SanitizeLogs() that strips ANSI escape sequences and non-printable control characters (preserving newlines, carriage returns, and tabs) from all container and deployment log output paths: - HandleAppLogs (text/plain response) - HandleDeploymentLogsAPI (JSON response) - HandleContainerLogsAPI (JSON response) Container log output is attacker-controlled data. Content-Type alone is insufficient — the data itself must be sanitized before serving. Includes comprehensive test coverage for the sanitization function.
31 lines
933 B
Go
31 lines
933 B
Go
package handlers
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import (
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"regexp"
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"strings"
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)
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// ansiEscapePattern matches ANSI escape sequences (CSI, OSC, and single-character escapes).
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var ansiEscapePattern = regexp.MustCompile(`(\x1b\[[0-9;]*[a-zA-Z]|\x1b\][^\x07]*\x07|\x1b[^[\]])`)
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// SanitizeLogs strips ANSI escape sequences and non-printable control characters
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// from container log output. Newlines (\n), carriage returns (\r), and tabs (\t)
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// are preserved. This ensures that attacker-controlled container output cannot
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// inject terminal escape sequences or other dangerous control characters.
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func SanitizeLogs(input string) string {
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// Strip ANSI escape sequences
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result := ansiEscapePattern.ReplaceAllString(input, "")
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// Strip remaining non-printable characters (keep \n, \r, \t)
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var b strings.Builder
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b.Grow(len(result))
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for _, r := range result {
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if r == '\n' || r == '\r' || r == '\t' || r >= ' ' {
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b.WriteRune(r)
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}
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}
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return b.String()
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}
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