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#!/bin/bash
# HKP keyserver CGI
# Implements: GET /pks/lookup?op=get|index|vindex and POST /pks/add
# Keys live in /var/pgp/keys/<FINGERPRINT_UPPERCASE>.asc
KEYS_DIR=/var/pgp/keys
FAVICON="data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHZpZXdCb3g9IjAgMCA1IDUiPjxyZWN0IHg9IjEiIHk9IjAiIHdpZHRoPSIxIiBoZWlnaHQ9IjEiLz48cmVjdCB4PSIyIiB5PSIxIiB3aWR0aD0iMSIgaGVpZ2h0PSIxIi8+PHJlY3QgeD0iMCIgeT0iMiIgd2lkdGg9IjEiIGhlaWdodD0iMSIvPjxyZWN0IHg9IjEiIHk9IjIiIHdpZHRoPSIxIiBoZWlnaHQ9IjEiLz48cmVjdCB4PSIyIiB5PSIyIiB3aWR0aD0iMSIgaGVpZ2h0PSIxIi8+PC9zdmc+"
CSS='@font-face { font-family: "Kawkab Mono"; src: url(/fonts/KawkabMono-Regular.woff2); font-weight: normal; }
@font-face { font-family: "Kawkab Mono"; src: url(/fonts/KawkabMono-Bold.woff2); font-weight: bold; }
* { unicode-bidi: plaintext; box-sizing: border-box; }
html { color: black; background-color: white; }
body { font-family: "Kawkab Mono"; font-size: 16px; line-height: 1.4; margin: 0; padding: 4rem 0; min-height: 100%; overflow-wrap: break-word; }
main, header, footer { max-width: 800px; margin-inline: auto; padding: 0 2rem; }
h1, header, footer { text-align: center; }
main { text-align: justify; }
p, h2, h3, h4 { margin: 1em 0 0 0; }
table { margin: 1em auto; border-collapse: collapse; }
th, td { border: 1px solid; padding: 0.3em 0.8em; }
code { font-size: 85%; }
hr { border: none; border-top: thin solid; margin: 1.25rem 0; }
header { margin-bottom: 1em; }
footer { margin-top: 3em; }
a { color: inherit; }
@media (max-width: 600px) { body { font-size: 0.9em; } h1 { font-size: 1.8em; } }
@media (max-width: 400px) { body { font-size: 0.8em; } h1 { font-size: 1.6em; } }
@media (prefers-color-scheme: dark) { html { filter: invert(1); } }'
FOOTER='<footer>
<hr>
<a href="https://twt.gumx.cc">twt</a> /
<a href="https://git.gumx.cc">git</a> /
<a href="https://mail.gumx.cc">mail</a> /
<a href="https://irc.gumx.cc">irc</a> /
<a href="https://files.gumx.cc">files</a> /
<a href="https://vpn.gumx.cc">vpn</a> /
<a href="https://pgp.gumx.cc">pgp</a> /
<a href="https://demo.gumx.cc">demo</a> /
<a href="https://wk.fo">wk.fo</a>
</footer>'
qs_get() {
echo "$QUERY_STRING" \
| tr '&' '\n' \
| grep -E "^$1=" \
| head -1 \
| cut -d= -f2- \
| sed 's/+/ /g; s/%20/ /g'
}
op=$(qs_get op)
search=$(qs_get search | sed 's/^0x//i; s/^0X//i')
case "$REQUEST_METHOD" in
GET)
case "$op" in
get)
printf "Content-Type: text/plain\r\n\r\n"
FP="${search^^}"
keyfile="$KEYS_DIR/$FP.asc"
if [[ -f "$keyfile" ]]; then
cat "$keyfile"
else
printf "Error: No key found for %s\n" "$search"
fi
;;
index)
printf "Content-Type: text/plain\r\n\r\n"
total=$(find "$KEYS_DIR" -name '*.asc' 2>/dev/null | wc -l)
echo "info:1:$total"
for f in "$KEYS_DIR"/*.asc; do
[[ -f "$f" ]] || continue
gpg --with-colons --import-options show-only \
--import < "$f" 2>/dev/null \
| awk -F: '/^pub/{print "pub:" $5 ":" $6 ":::" $10 "::"}'
done
;;
vindex)
printf "Content-Type: text/html\r\n\r\n"
printf '<!DOCTYPE html>\n<html lang="en">\n<head>\n'
printf '<meta charset="utf-8">\n'
printf '<link rel="icon" type="image/svg+xml" href="%s">\n' "$FAVICON"
printf '<meta name="viewport" content="width=device-width,initial-scale=1">\n'
printf '<title>pgp.gumx.cc / keys</title>\n'
printf '<style>\n%s\n</style>\n' "$CSS"
printf '</head>\n<body>\n'
printf '<header>\n<h1><a href="https://gumx.cc">gumx</a> / <a href="https://pgp.gumx.cc">pgp</a> / keys</h1>\n</header>\n'
printf '<main>\n<table>\n<tr><th>fingerprint</th><th>uid</th></tr>\n'
found=0
for f in "$KEYS_DIR"/*.asc; do
[[ -f "$f" ]] || continue
found=1
FP=$(basename "$f" .asc)
KEY_UID=$(gpg --with-colons --import-options show-only --import < "$f" 2>/dev/null \
| awk -F: '/^uid/{print $10; exit}')
printf '<tr><td><a href="/pks/lookup?op=get&search=0x%s"><code>%s</code></a></td><td>%s</td></tr>\n' \
"$FP" "$FP" "$KEY_UID"
done
[[ $found -eq 0 ]] && printf '<tr><td colspan="2">no keys</td></tr>\n'
printf '</table>\n</main>\n'
printf '%s\n' "$FOOTER"
printf '</body>\n</html>\n'
;;
*)
printf "Content-Type: text/plain\r\n\r\n"
echo "Error: unknown op"
;;
esac
;;
POST)
printf "Content-Type: text/plain\r\n\r\n"
read -r -d '' -n "${CONTENT_LENGTH:-4096}" SUBMITTED_KEY
TMPDIR_GPG=$(mktemp -d)
FINGERPRINT=$(echo "$SUBMITTED_KEY" \
| gpg --homedir "$TMPDIR_GPG" \
--with-colons --import-options show-only \
--import 2>/dev/null \
| awk -F: '/^fpr/{print $10; exit}')
rm -rf "$TMPDIR_GPG"
if [[ -z "$FINGERPRINT" ]]; then
echo "Error: Could not parse submitted key"
exit 0
fi
KEYFILE="$KEYS_DIR/${FINGERPRINT^^}.asc"
if [[ -f "$KEYFILE" ]]; then
echo "$SUBMITTED_KEY" > "$KEYFILE"
echo "Key updated successfully"
else
echo "Error: Fingerprint not registered."
echo "Contact ahmed@gumx.cc to arrange a key signing meeting."
fi
;;
esac
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