security: input validation hardening (#854)#903
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- zeph-gateway: enforce per-field byte limits on WebhookPayload (sender/channel <= 256, body <= 65536) and strip ASCII control chars from sender/channel to prevent prompt injection (#868) - zeph-acp: strip null bytes from tool names before cache key construction to eliminate key collision vector (#872) - zeph-core: bound gateway.max_body_size to 10 MiB in config validation to prevent memory exhaustion from misconfiguration (#875)
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Feb 25, 2026
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Closes #854. Implements all three child issues in parallel.
Changes
#868 — Gateway webhook payload validation (
zeph-gateway)WebhookPayload::validate()enforces byte limits:sender/channel<= 256 bytes,body<= 65536 bytes; returns HTTP 422 on failuresanitize_control_chars()strips ASCII control chars (0x00–0x1F, 0x7F, preserving\n) fromsenderandchannel#872 — ACP null-byte cache key collision (
zeph-acp)tool_namebeforeformat!("{session_id}\0{tool_name}")in bothcheck_permissionandrun_permission_handler#875 — Config
max_body_sizeupper bound (zeph-core)validate()rejectsgateway.max_body_size > 10_485_760(10 MiB) with descriptive errorVerification
cargo +nightly fmt --check— passedcargo clippy --workspace -- -D warnings— 0 warningscargo nextest run --workspace --lib --bins— 2722 tests passed