46 lines
1.5 KiB
Bash
46 lines
1.5 KiB
Bash
#!/bin/sh
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# Set Content-Type for CGI script
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echo "Content-type: application/json"
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echo ""
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# Read POST data
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read POST_DATA
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# Extract the password from POST data (URL encoded)
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USER="root"
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INPUT_PASSWORD=$(echo "$POST_DATA" | sed -n 's/^.*password=\([^&]*\).*$/\1/p')
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# URL-decode the password (replace + with space and decode %XX)
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INPUT_PASSWORD=$(echo "$INPUT_PASSWORD" | sed 's/+/ /g;s/%\(..\)/\\x\1/g' | xargs -0 printf "%b")
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# Log received password for debugging (remove in production)
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# echo "Received password: $INPUT_PASSWORD" >&2
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# Extract the hashed password from /etc/shadow for the specified user
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USER_SHADOW_ENTRY=$(grep "^$USER:" /etc/shadow)
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if [ -z "$USER_SHADOW_ENTRY" ]; then
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echo '{"state":"failed", "message":"User not found"}'
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exit 1
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fi
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# Extract the password hash (it's the second field, colon-separated)
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USER_HASH=$(echo "$USER_SHADOW_ENTRY" | cut -d: -f2)
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# Extract the salt (MD5 uses the $1$ prefix followed by the salt)
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SALT=$(echo "$USER_HASH" | cut -d'$' -f3)
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# Generate a hash from the input password using the same salt
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GENERATED_HASH=$(echo "$INPUT_PASSWORD" | openssl passwd -1 -salt "$SALT" -stdin)
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# Log generated hash for debugging
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echo "Generated hash: $GENERATED_HASH" >&2
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# Compare the generated hash with the one in the shadow file
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if [ "$GENERATED_HASH" = "$USER_HASH" ]; then
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echo '{"state":"success", "hashed_password":"'"$GENERATED_HASH"'"}'
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else
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echo '{"state":"failed", "hashed_password":"'"$GENERATED_HASH"'"}'
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fi
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