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Support TLS_CLIENT_SERIAL_NUMBER in CGI

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dece 2021-06-17 13:25:26 +02:00 committed by Drew DeVault
parent 0bf3cde2a0
commit d7bd3c6a0d
2 changed files with 18 additions and 2 deletions
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3
doc/gmnisrvini.scd
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@ -181,6 +181,9 @@ The following environment variables will be set:
| *TLS_CLIENT_HASH*
: SHA256:BD3A388021A92017B781504A3D24F324BF9DE11CE72606AB445D98A8EB00C5A8
: Unique fingerprint of the client certificate.
| *TLS_CLIENT_SERIAL_NUMBER*
: 717823108622037499122666796829184010024179612962
: Serial number (decimal) of the client certificate.
\[1]: gemini://example.org/cgi-bin/foo.sh/bar?hello=world

17
src/serve.c
View File

@ -200,8 +200,7 @@ serve_cgi(struct gmnisrv_client *client, const char *path,
// barebones client cert implementation
// adapted from openssl(1)'s implementation
// TODO: support REMOTE_USER, TLS_CLIENT_NOT_{BEFORE,AFTER},
// TLS_CLIENT_SERIAL_NUMBER
// TODO: support REMOTE_USER, TLS_CLIENT_NOT_{BEFORE,AFTER}
X509 *client_cert = SSL_get_peer_certificate(client->ssl);
if (client_cert != NULL) {
// 32 bytes because we're always using SHA256, but
@ -226,6 +225,20 @@ serve_cgi(struct gmnisrv_client *client, const char *path,
const char *error = "Out of memory";
client_submit_response(client,
GEMINI_STATUS_TEMPORARY_FAILURE, error, NULL);
goto post_client_cert_parsing;
}
const ASN1_INTEGER *sn_asn = X509_get0_serialNumber(client_cert);
BIGNUM *sn_bn = ASN1_INTEGER_to_BN(sn_asn, NULL);
char *sn_dec = BN_bn2dec(sn_bn);
BN_free(sn_bn);
if (sn_dec != NULL) {
setenv("TLS_CLIENT_SERIAL_NUMBER", sn_dec, 1);
OPENSSL_free(sn_dec);
} else {
const char *error = "Invalid certificate serial number";
client_submit_response(client,
GEMINI_STATUS_CERTIFICATE_NOT_VALID, error, NULL);
}
}