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fix(line): add request body size limit to webhook handler

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Prevent unauthenticated DoS via unbounded io.ReadAll on webhook
request body. Apply the same io.LimitReader pattern used by the
WeCom channel (4 MB cap) to reject oversized POST payloads before
signature verification or JSON parsing.

Fixes #1407
This commit is contained in:
Subash 2026-03-13 07:58:47 +05:30
parent 3bcbfd99b9
commit 0a6453ffb8
1 changed files with 7 additions and 1 deletions
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8
pkg/channels/line/line.go
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@ -166,7 +166,9 @@ func (c *LINEChannel) webhookHandler(w http.ResponseWriter, r *http.Request) {
return
}
body, err := io.ReadAll(r.Body)
// Limit request body to 4 MB to prevent memory exhaustion (DoS).
const maxBodySize = 4 << 20 // 4 MB
body, err := io.ReadAll(io.LimitReader(r.Body, maxBodySize+1))
if err != nil {
logger.ErrorCF("line", "Failed to read request body", map[string]any{
"error": err.Error(),
@ -174,6 +176,10 @@ func (c *LINEChannel) webhookHandler(w http.ResponseWriter, r *http.Request) {
http.Error(w, "Bad request", http.StatusBadRequest)
return
}
if len(body) > maxBodySize {
http.Error(w, "Request body too large", http.StatusRequestEntityTooLarge)
return
}
signature := r.Header.Get("X-Line-Signature")
if !c.verifySignature(body, signature) {