schannel: cap the maximum allowed size for loading cert #19964
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To avoid problems with mistakes or abuse, cap the largest allowed certificate size to load to CURL_MAX_INPUT_LENGTH bytes (8MB).
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Pull request overview
This PR adds a security enhancement to cap the maximum allowed certificate file size when loading client certificates in the schannel SSL/TLS backend. The change prevents potential issues from mistakes or abuse by limiting certificate files to CURL_MAX_INPUT_LENGTH (8MB).
Key changes:
- Added size validation check before allocating memory for certificate data from files
- Aligns schannel file-based certificate loading with existing protections for certificate blobs
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To avoid problems with mistakes or abuse, cap the largest allowed certificate size to load to CURL_MAX_INPUT_LENGTH bytes (8MB).