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Use v3 X509 certificate

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This fixes an issue where rustls failed to validate the X509v1 certificate.

Tested with Amfora, av-98, and titan (https://github.com/mkeeter/titan)

This requires fresh certificates, which could break clients with strict
trust-on-first-use policies; unfortunately, it doesn't appear to be possible
to migrate v1 certificates to v3.
This commit is contained in:
Matt Keeter 2021-02-02 20:33:03 -05:00 committed by Drew DeVault
parent 32913c35cd
commit d1ccb60a52
1 changed files with 14 additions and 1 deletions
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15
src/tls.c
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@ -5,7 +5,7 @@
#include <openssl/err.h>
#include <openssl/pem.h>
#include <openssl/ssl.h>
#include <openssl/x509.h>
#include <openssl/x509v3.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
@ -33,6 +33,7 @@ tls_host_gencert(struct gmnisrv_tls *tlsconf, struct gmnisrv_host *host,
X509 * x509 = X509_new();
assert(x509);
X509_set_version(x509, 2);
ASN1_INTEGER_set(X509_get_serialNumber(x509), 1);
X509_gmtime_adj(X509_get_notBefore(x509), 0);
X509_gmtime_adj(X509_get_notAfter(x509), 31536000L); // 1 year
@ -49,6 +50,18 @@ tls_host_gencert(struct gmnisrv_tls *tlsconf, struct gmnisrv_host *host,
(unsigned char *)host->hostname, -1, -1, 0);
X509_set_issuer_name(x509, name);
X509V3_CTX ctx;
X509V3_set_ctx_nodb(&ctx);
X509V3_set_ctx(&ctx, NULL, x509, NULL, NULL, 0);
char alt_name[512];
r = snprintf(alt_name, sizeof(alt_name), "DNS:%s", host->hostname);
assert(r >= 0 && (size_t)r < sizeof(alt_name));
X509_EXTENSION* ext = X509V3_EXT_conf_nid(NULL, &ctx,
NID_subject_alt_name, alt_name);
assert(ext);
X509_add_ext(x509, ext, -1);
X509_EXTENSION_free(ext);
r = X509_sign(x509, pkey, EVP_sha256());
assert(r);