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lftp/lftp-4.9.2-gnutls-peers2.patch

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From fd40ee3542d877c37ff129d5c9b02df21d20c6a0 Mon Sep 17 00:00:00 2001
From: Miao Wang <shankerwangmiao@gmail.com>
Date: Sat, 9 Oct 2021 18:13:30 +0800
Subject: [PATCH] Use gnutls_certificate_verify_peers2 to verify server
certificates
Fixes: #641
Signed-off-by: Miao Wang <shankerwangmiao@gmail.com>
---
src/lftp_ssl.cc | 207 +++++++++++-------------------------------------
src/lftp_ssl.h | 2 -
2 files changed, 48 insertions(+), 161 deletions(-)
diff --git a/src/lftp_ssl.cc b/src/lftp_ssl.cc
index 968d3fb26..26e91e4b9 100644
--- a/src/lftp_ssl.cc
+++ b/src/lftp_ssl.cc
@@ -338,6 +338,16 @@ void lftp_ssl_gnutls::load_keys()
if(res<0)
Log::global->Format(0,"gnutls_certificate_set_x509_key_file(%s,%s): %s\n",cert_file,key_file,gnutls_strerror(res));
}
+ res = gnutls_certificate_set_x509_trust(cred, instance->ca_list, instance->ca_list_size);
+ if(res < 0)
+ Log::global->Format(0, "gnutls_certificate_set_x509_trust: %s\n", gnutls_strerror(res));
+ else
+ Log::global->Format(9, "Loaded %d CAs\n", res);
+ res = gnutls_certificate_set_x509_crl(cred, instance->crl_list, instance->crl_list_size);
+ if(res < 0)
+ Log::global->Format(0, "gnutls_certificate_set_x509_crl: %s\n", gnutls_strerror(res));
+ else
+ Log::global->Format(9, "Loaded %d CRLs\n", res);
gnutls_credentials_set(session, GNUTLS_CRD_CERTIFICATE, cred);
}
void lftp_ssl_gnutls::shutdown()
@@ -358,174 +368,53 @@ lftp_ssl_gnutls::~lftp_ssl_gnutls()
*/
void lftp_ssl_gnutls::verify_certificate_chain(const gnutls_datum_t *cert_chain,int cert_chain_length)
{
- int i;
- gnutls_x509_crt_t *cert=(gnutls_x509_crt_t*)alloca(cert_chain_length*sizeof(gnutls_x509_crt_t));
-
- /* Import all the certificates in the chain to
- * native certificate format.
- */
- for (i = 0; i < cert_chain_length; i++)
- {
- gnutls_x509_crt_init(&cert[i]);
- gnutls_x509_crt_import(cert[i],&cert_chain[i],GNUTLS_X509_FMT_DER);
+ int err;
+ unsigned int status;
+
+ gnutls_x509_crt_t leaf_cert;
+ err = gnutls_x509_crt_init(&leaf_cert);
+ if(err < 0){
+ set_cert_error(xstring::format("GnuTLS Error: %s", gnutls_strerror(err)), NULL);
+ goto err_out;
}
-
- /* Now verify the certificates against their issuers
- * in the chain.
- */
- for (i = 1; i < cert_chain_length; i++)
- verify_cert2(cert[i - 1], cert[i]);
-
- /* Here we must verify the last certificate in the chain against
- * our trusted CA list.
- */
- verify_last_cert(cert[cert_chain_length - 1]);
-
- /* Check if the name in the first certificate matches our destination!
- */
- bool check_hostname = ResMgr::QueryBool("ssl:check-hostname", hostname);
- if(check_hostname) {
- if(!gnutls_x509_crt_check_hostname(cert[0], hostname))
- set_cert_error(xstring::format("certificate common name doesn't match requested host name %s",quote(hostname)),get_fp(cert[0]));
- } else {
- Log::global->Format(0, "WARNING: Certificate verification: hostname checking disabled\n");
+ gnutls_x509_crt_import(leaf_cert, &cert_chain[0], GNUTLS_X509_FMT_DER);
+ if(err < 0){
+ set_cert_error(xstring::format("GnuTLS Error: %s", gnutls_strerror(err)), NULL);
+ goto deinit_cert;
}
- for (i = 0; i < cert_chain_length; i++)
- gnutls_x509_crt_deinit(cert[i]);
-}
-
-
-/* Verifies a certificate against an other certificate
- * which is supposed to be it's issuer. Also checks the
- * crl_list if the certificate is revoked.
- */
-void lftp_ssl_gnutls::verify_cert2(gnutls_x509_crt_t crt,gnutls_x509_crt_t issuer)
-{
- int ret;
- time_t now = SMTask::now;
- size_t name_size;
- char name[256];
-
- /* Print information about the certificates to
- * be checked.
- */
- name_size = sizeof(name);
- gnutls_x509_crt_get_dn(crt, name, &name_size);
-
- Log::global->Format(9, "Certificate: %s\n", name);
-
- name_size = sizeof(name);
- gnutls_x509_crt_get_issuer_dn(crt, name, &name_size);
-
- Log::global->Format(9, " Issued by: %s\n", name);
-
- /* Get the DN of the issuer cert.
- */
- name_size = sizeof(name);
- gnutls_x509_crt_get_dn(issuer, name, &name_size);
-
- Log::global->Format(9, " Checking against: %s\n", name);
-
- /* Do the actual verification.
- */
- unsigned crt_status=0;
- unsigned issuer_status=0;
- gnutls_x509_crt_verify(crt, &issuer, 1, 0, &crt_status);
- if(crt_status&GNUTLS_CERT_SIGNER_NOT_CA)
- {
- // recheck the issuer certificate against CA
- gnutls_x509_crt_verify(issuer, instance->ca_list, instance->ca_list_size, 0, &issuer_status);
- if(issuer_status==0)
- crt_status&=~GNUTLS_CERT_SIGNER_NOT_CA;
- if(crt_status==GNUTLS_CERT_INVALID)
- crt_status=0;
+ err = gnutls_certificate_verify_peers2 (session, &status);
+ if(err < 0){
+ set_cert_error(xstring::format("Cerificate Verification Error: %s", gnutls_strerror(err)), get_fp(leaf_cert));
+ goto deinit_cert;
}
- if (crt_status & GNUTLS_CERT_INVALID)
- {
- char msg[256];
- strcpy(msg,"Not trusted");
- if(crt_status & GNUTLS_CERT_SIGNER_NOT_FOUND)
- strcat(msg,": no issuer was found");
- if(crt_status & GNUTLS_CERT_SIGNER_NOT_CA)
- strcat(msg,": issuer is not a CA");
- set_cert_error(msg,get_fp(crt));
- }
- else
- Log::global->Format(9, " Trusted\n");
-
- /* Now check the expiration dates.
- */
- if (gnutls_x509_crt_get_activation_time(crt) > now)
- set_cert_error("Not yet activated",get_fp(crt));
-
- if (gnutls_x509_crt_get_expiration_time(crt) < now)
- set_cert_error("Expired",get_fp(crt));
-
- /* Check if the certificate is revoked.
- */
- ret = gnutls_x509_crt_check_revocation(crt, instance->crl_list, instance->crl_list_size);
- if (ret == 1) { /* revoked */
- set_cert_error("Revoked",get_fp(crt));
- }
-}
-
-
-/* Verifies a certificate against the trusted CA list.
- * Also checks the crl_list if the certificate is revoked.
- */
-void lftp_ssl_gnutls::verify_last_cert(gnutls_x509_crt_t crt)
-{
- unsigned int crt_status;
- int ret;
- time_t now = SMTask::now;
- size_t name_size;
- char name[256];
-
- /* Print information about the certificates to
- * be checked.
- */
- name_size = sizeof(name);
- gnutls_x509_crt_get_dn(crt, name, &name_size);
-
- Log::global->Format(9, "Certificate: %s\n", name);
-
- name_size = sizeof(name);
- gnutls_x509_crt_get_issuer_dn(crt, name, &name_size);
-
- Log::global->Format(9, " Issued by: %s\n", name);
-
- /* Do the actual verification.
- */
- gnutls_x509_crt_verify(crt, instance->ca_list, instance->ca_list_size, GNUTLS_VERIFY_ALLOW_X509_V1_CA_CRT, &crt_status);
-
- if (crt_status & GNUTLS_CERT_INVALID)
- {
- char msg[256];
- strcpy(msg,"Not trusted");
- if (crt_status & GNUTLS_CERT_SIGNER_NOT_CA)
- strcat(msg,": Issuer is not a CA");
- set_cert_error(msg,get_fp(crt));
+ if(status != 0){
+ gnutls_datum_t reason;
+ err = gnutls_certificate_verification_status_print(status, gnutls_certificate_type_get(session), &reason, 0);
+ if(err < 0){
+ set_cert_error(xstring::format("Cerificate Verification Error: %s", gnutls_strerror(err)), get_fp(leaf_cert));
+ goto deinit_cert;
+ }
+ set_cert_error((const char*)reason.data, get_fp(leaf_cert));
+ gnutls_free(reason.data);
+ goto deinit_cert;
}
- else
- Log::global->Format(9, " Trusted\n");
+ if(ResMgr::QueryBool("ssl:check-hostname", hostname)) {
+ if(!gnutls_x509_crt_check_hostname(leaf_cert, hostname)){
+ set_cert_error(xstring::format("certificate common name doesn't match requested host name %s",quote(hostname)),get_fp(leaf_cert));
+ goto deinit_cert;
+ }
+ } else {
+ Log::global->Format(0, "WARNING: Certificate verification: hostname checking disabled\n");
+ }
- /* Now check the expiration dates.
- */
- if(gnutls_x509_crt_get_activation_time(crt) > now)
- set_cert_error("Not yet activated",get_fp(crt));
-
- if(gnutls_x509_crt_get_expiration_time(crt) < now)
- set_cert_error("Expired",get_fp(crt));
+ deinit_cert:
+ gnutls_x509_crt_deinit(leaf_cert);
- /* Check if the certificate is revoked.
- */
- ret = gnutls_x509_crt_check_revocation(crt, instance->crl_list, instance->crl_list_size);
- if (ret == 1) { /* revoked */
- set_cert_error("Revoked",get_fp(crt));
- }
+ err_out:
+ return;
}
bool lftp_ssl_gnutls::check_fatal(int res)
diff --git a/src/lftp_ssl.h b/src/lftp_ssl.h
index c37b047b4..87b92d4fa 100644
--- a/src/lftp_ssl.h
+++ b/src/lftp_ssl.h
@@ -92,8 +92,6 @@ class lftp_ssl_gnutls : public lftp_ssl_base
gnutls_session_t session;
gnutls_certificate_credentials_t cred;
void verify_certificate_chain(const gnutls_datum_t *cert_chain,int cert_chain_length);
- void verify_cert2(gnutls_x509_crt_t crt,gnutls_x509_crt_t issuer);
- void verify_last_cert(gnutls_x509_crt_t crt);
int do_handshake();
bool check_fatal(int res);
static const xstring& get_fp(gnutls_x509_crt_t crt);
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