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[Openvpn-devel,S] Change in openvpn[master]: Log OpenSSL errors on failure to set certificate

Message ID d15152659324fbda74af71fe4124941eb5982500-HTML@gerrit.openvpn.net
State Not Applicable
Headers show
Series [Openvpn-devel,S] Change in openvpn[master]: Log OpenSSL errors on failure to set certificate | expand

Commit Message

ordex (Code Review) Oct. 1, 2023, 6:02 p.m. UTC 
Attention is currently required from: flichtenheld.

Hello flichtenheld,

I'd like you to do a code review.
Please visit

    http://gerrit.openvpn.net/c/openvpn/+/363?usp=email

to review the following change.


Change subject: Log OpenSSL errors on failure to set certificate
......................................................................

Log OpenSSL errors on failure to set certificate

Currently we log a bogus error message saying private key password verification
failed when SSL_CTX_use_cert_and_key() fails in pkcs11_openssl.c. Instead print
OpenSSL error queue and exit promptly.

Also log OpenSSL errors when SSL_CTX_use_certiifcate() fails in cryptoapi.c
and elsewhere. Such logging could be useful especially when the ceritficate is
rejected by OpenSSL due to stricter security restrictions in recent versions
of the library.

Change-Id: Ic7ec25ac0503a91d5869b8da966d0065f264af22
Signed-off-by: Selva Nair <selva.nair@gmail.com>
---
M src/openvpn/cryptoapi.c
M src/openvpn/pkcs11_openssl.c
M src/openvpn/ssl_openssl.c
M tests/unit_tests/openvpn/test_cryptoapi.c
M tests/unit_tests/openvpn/test_pkcs11.c
5 files changed, 30 insertions(+), 2 deletions(-)



  git pull ssh://gerrit.openvpn.net:29418/openvpn refs/changes/63/363/1
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Patch

diff --git a/src/openvpn/cryptoapi.c b/src/openvpn/cryptoapi.c
index 3b92e48..f7e5b67 100644
--- a/src/openvpn/cryptoapi.c
+++ b/src/openvpn/cryptoapi.c
@@ -51,6 +51,7 @@ 
 #include "openssl_compat.h"
 #include "win32.h"
 #include "xkey_common.h"
+#include "crypto_openssl.h"
 
 #ifndef HAVE_XKEY_PROVIDER
 
@@ -505,6 +506,7 @@ 
     if (SSL_CTX_use_certificate(ssl_ctx, cert)
         && SSL_CTX_use_PrivateKey(ssl_ctx, privkey))
     {
+        crypto_print_openssl_errors(M_WARN);
         ret = 1;
     }
 
diff --git a/src/openvpn/pkcs11_openssl.c b/src/openvpn/pkcs11_openssl.c
index 40080ef..aa0819f 100644
--- a/src/openvpn/pkcs11_openssl.c
+++ b/src/openvpn/pkcs11_openssl.c
@@ -302,7 +302,8 @@ 
 
     if (!SSL_CTX_use_cert_and_key(ctx->ctx, x509, pkey, NULL, 0))
     {
-        msg(M_WARN, "PKCS#11: Failed to set cert and private key for OpenSSL");
+        crypto_print_openssl_errors(M_WARN);
+        msg(M_FATAL, "PKCS#11: Failed to set cert and private key for OpenSSL");
         goto cleanup;
     }
     ret = 1;
@@ -369,7 +370,8 @@ 
 
     if (!SSL_CTX_use_certificate(ssl_ctx->ctx, x509))
     {
-        msg(M_WARN, "PKCS#11: Cannot set certificate for openssl");
+        crypto_print_openssl_errors(M_WARN);
+        msg(M_FATAL, "PKCS#11: Cannot set certificate for openssl");
         goto cleanup;
     }
     ret = 0;
diff --git a/src/openvpn/ssl_openssl.c b/src/openvpn/ssl_openssl.c
index 0b310de..b5cc9a7 100644
--- a/src/openvpn/ssl_openssl.c
+++ b/src/openvpn/ssl_openssl.c
@@ -857,6 +857,7 @@ 
     /* Load Certificate */
     if (!SSL_CTX_use_certificate(ctx->ctx, cert))
     {
+        crypto_print_openssl_errors(M_WARN);
         crypto_msg(M_FATAL, "Cannot use certificate");
     }
 
@@ -1007,6 +1008,7 @@ 
 end:
     if (!ret)
     {
+        crypto_print_openssl_errors(M_WARN);
         if (cert_file_inline)
         {
             crypto_msg(M_FATAL, "Cannot load inline certificate file");
diff --git a/tests/unit_tests/openvpn/test_cryptoapi.c b/tests/unit_tests/openvpn/test_cryptoapi.c
index 008f41c..d90bfc3 100644
--- a/tests/unit_tests/openvpn/test_cryptoapi.c
+++ b/tests/unit_tests/openvpn/test_cryptoapi.c
@@ -58,6 +58,17 @@ 
     return NULL;
 }
 
+/* replacement for crypto_print_openssl_errors() */
+void
+crypto_print_openssl_errors(const unsigned int flags)
+{
+    unsigned long e;
+    while ((e = ERR_get_error()))
+    {
+        msg(flags, "OpenSSL error %lu: %s\n", e, ERR_error_string(e, NULL));
+    }
+}
+
 /* tls_libctx is defined in ssl_openssl.c which we do not want to compile in */
 OSSL_LIB_CTX *tls_libctx;
 
diff --git a/tests/unit_tests/openvpn/test_pkcs11.c b/tests/unit_tests/openvpn/test_pkcs11.c
index 235cc43..b6c130e 100644
--- a/tests/unit_tests/openvpn/test_pkcs11.c
+++ b/tests/unit_tests/openvpn/test_pkcs11.c
@@ -44,6 +44,17 @@ 
 
 struct management *management; /* global */
 
+/* replacement for crypto_print_openssl_errors() */
+void
+crypto_print_openssl_errors(const unsigned int flags)
+{
+    unsigned long e;
+    while ((e = ERR_get_error()))
+    {
+        msg(flags, "OpenSSL error %lu: %s\n", e, ERR_error_string(e, NULL));
+    }
+}
+
 /* stubs for some unused functions instead of pulling in too many dependencies */
 int
 parse_line(const char *line, char **p, const int n, const char *file,