]> git.ipfire.org Git - thirdparty/curl.git/commitdiff
tls: fix incomplete mTLS config in conn reuse and session cache
authorJoshua Rogers <MegaManSec@users.noreply.github.com>
Tue, 19 May 2026 09:47:50 +0000 (11:47 +0200)
committerDaniel Stenberg <daniel@haxx.se>
Tue, 19 May 2026 22:02:33 +0000 (00:02 +0200)
cert_type, key, key_type, key_passwd and key_blob lived in
ssl_config_data but not in ssl_primary_config, so they were invisible to
match_ssl_primary_config() and to the TLS session cache peer key.

Two easy handles sharing a connection pool could reuse each other's
authenticated connections when they differed only on SSLKEY, SSLKEYTYPE,
KEYPASSWD, SSLCERTTYPE or SSLKEYBLOB. The second handle would silently
inherit the first handle's authenticated identity.

Promote all five fields into ssl_primary_config so the conn-reuse
predicate and session cache key cover the complete client credential
set. Also replace the fixed ":CCERT" session cache marker with the
actual clientcert path so sessions are not shared across different
client certificates.

Verified by test 3303 and 3304

Reported-By: Joshua Rogers (AISLE Research)
Closes #21667

19 files changed:
lib/ldap.c
lib/urldata.h
lib/vssh/libssh.c
lib/vssh/libssh2.c
lib/vtls/gtls.c
lib/vtls/mbedtls.c
lib/vtls/openssl.c
lib/vtls/rustls.c
lib/vtls/schannel.c
lib/vtls/vtls.c
lib/vtls/vtls_scache.c
lib/vtls/vtls_scache.h
lib/vtls/wolfssl.c
tests/data/Makefile.am
tests/data/test3303 [new file with mode: 0644]
tests/data/test3304 [new file with mode: 0644]
tests/unit/Makefile.inc
tests/unit/unit3303.c [new file with mode: 0644]
tests/unit/unit3304.c [new file with mode: 0644]

index 0f9e7821719bd36ceb27f87d560abfa4e2ed5080..ed74e9a19afdc23eb759d00246f343a3e4084a79 100644 (file)
@@ -326,8 +326,8 @@ static CURLcode ldap_do(struct Curl_easy *data, bool *done)
 #ifdef LDAP_OPT_X_TLS
     if(conn->ssl_config.verifypeer) {
       /* OpenLDAP SDK supports BASE64 files. */
-      if(data->set.ssl.cert_type &&
-         !curl_strequal(data->set.ssl.cert_type, "PEM")) {
+      if(data->set.ssl.primary.cert_type &&
+         !curl_strequal(data->set.ssl.primary.cert_type, "PEM")) {
         failf(data, "LDAP local: ERROR OpenLDAP only supports PEM cert-type");
         result = CURLE_SSL_CERTPROBLEM;
         goto quit;
index 85630b05b7b03b4c64514c8a7f247dcbac6b0957..883e3cec31f2f921aea7b3b39667e77a2d9bc316 100644 (file)
@@ -150,9 +150,14 @@ struct ssl_primary_config {
   char *signature_algorithms; /* list of signature algorithms to use */
   char *pinned_key;
   char *CRLfile;         /* CRL to check certificate revocation */
+  char *cert_type;       /* format for certificate (default: PEM) */
+  char *key;             /* private key filename */
+  char *key_type;        /* format for private key (default: PEM) */
+  char *key_passwd;      /* plain text private key password */
   struct curl_blob *cert_blob;
   struct curl_blob *ca_info_blob;
   struct curl_blob *issuercert_blob;
+  struct curl_blob *key_blob;
 #ifdef USE_TLS_SRP
   char *username; /* TLS username (for, e.g., SRP) */
   char *password; /* TLS password (for, e.g., SRP) */
@@ -172,11 +177,6 @@ struct ssl_config_data {
   long certverifyresult; /* result from the certificate verification */
   curl_ssl_ctx_callback fsslctx; /* function to initialize ssl ctx */
   void *fsslctxp;        /* parameter for call back */
-  char *cert_type; /* format for certificate (default: PEM) */
-  char *key; /* private key filename */
-  struct curl_blob *key_blob;
-  char *key_type; /* format for private key (default: PEM) */
-  char *key_passwd; /* plain text private key password */
   BIT(certinfo);     /* gather lots of certificate info */
   BIT(earlydata);    /* use TLS 1.3 early data */
   BIT(enable_beast); /* allow this flaw for interoperability's sake */
index 149b4cce0ce98908e4c8aa01ca919b0dbfbb66dc..09084765bcf0da0e0f6c828fbc4a8dd453be8636 100644 (file)
@@ -862,7 +862,7 @@ static int myssh_in_AUTH_PKEY_INIT(struct Curl_easy *data,
   /* Two choices, (1) private key was given on CMD,
    * (2) use the "default" keys. */
   if(data->set.str[STRING_SSH_PRIVATE_KEY]) {
-    if(sshc->pubkey && !data->set.ssl.key_passwd) {
+    if(sshc->pubkey && !data->set.ssl.primary.key_passwd) {
       rc = ssh_userauth_try_publickey(sshc->ssh_session, NULL, sshc->pubkey);
       if(rc == SSH_AUTH_AGAIN)
         return SSH_AGAIN;
@@ -875,7 +875,7 @@ static int myssh_in_AUTH_PKEY_INIT(struct Curl_easy *data,
 
     rc = ssh_pki_import_privkey_file(data->
                                      set.str[STRING_SSH_PRIVATE_KEY],
-                                     data->set.ssl.key_passwd, NULL,
+                                     data->set.ssl.primary.key_passwd, NULL,
                                      NULL, &sshc->privkey);
     if(rc != SSH_OK) {
       failf(data, "Could not load private key file %s",
@@ -888,7 +888,7 @@ static int myssh_in_AUTH_PKEY_INIT(struct Curl_easy *data,
   }
   else {
     rc = ssh_userauth_publickey_auto(sshc->ssh_session, NULL,
-                                     data->set.ssl.key_passwd);
+                                     data->set.ssl.primary.key_passwd);
     if(rc == SSH_AUTH_AGAIN)
       return SSH_AGAIN;
 
index 0226ebfd275448d280224d47816b4d5b5b9a918a..31c3024449f1ca3bbb626a89657afa5c73037c7c 100644 (file)
@@ -1147,7 +1147,7 @@ static CURLcode ssh_state_pkey_init(struct Curl_easy *data,
       return CURLE_OUT_OF_MEMORY;
     }
 
-    sshc->passphrase = data->set.ssl.key_passwd;
+    sshc->passphrase = data->set.ssl.primary.key_passwd;
     if(!sshc->passphrase)
       sshc->passphrase = "";
 
index fa4d6c42cc38e467879ece3277cf10360b473154..a8ffc28e8c375ad835ecc43fc62a27b526d73967 100644 (file)
@@ -996,10 +996,11 @@ static CURLcode gtls_client_init(struct Curl_cfilter *cf,
       if(result)
         return result;
     }
-    if(ssl_config->cert_type && curl_strequal(ssl_config->cert_type, "P12")) {
+    if(ssl_config->primary.cert_type &&
+       curl_strequal(ssl_config->primary.cert_type, "P12")) {
       rc = gnutls_certificate_set_x509_simple_pkcs12_file(
         gtls->shared_creds->creds, config->clientcert, GNUTLS_X509_FMT_DER,
-        ssl_config->key_passwd ? ssl_config->key_passwd : "");
+        ssl_config->primary.key_passwd ? ssl_config->primary.key_passwd : "");
       if(rc != GNUTLS_E_SUCCESS) {
         failf(data,
               "error reading X.509 potentially-encrypted key or certificate "
@@ -1017,14 +1018,15 @@ static CURLcode gtls_client_init(struct Curl_cfilter *cf,
       rc = gnutls_certificate_set_x509_key_file2(
            gtls->shared_creds->creds,
            config->clientcert,
-           ssl_config->key ? ssl_config->key : config->clientcert,
-           gnutls_do_file_type(ssl_config->cert_type),
-           ssl_config->key_passwd,
+           ssl_config->primary.key ? ssl_config->primary.key :
+                                     config->clientcert,
+           gnutls_do_file_type(ssl_config->primary.cert_type),
+           ssl_config->primary.key_passwd,
            supported_key_encryption_algorithms);
       if(rc != GNUTLS_E_SUCCESS) {
         failf(data,
               "error reading X.509 %skey file: %s",
-              ssl_config->key_passwd ? "potentially-encrypted " : "",
+              ssl_config->primary.key_passwd ? "potentially-encrypted " : "",
               gnutls_strerror(rc));
         return CURLE_SSL_CONNECT_ERROR;
       }
index 9cd890a1c05d5f092856e71e3e8ddaf120b6c9e7..390570bacda1c2f8fc8ba7121bf060f912077b1c 100644 (file)
@@ -486,7 +486,7 @@ static CURLcode mbed_load_cacert(struct Curl_cfilter *cf,
   const char * const ssl_capath = conn_config->CApath;
 #ifdef MBEDTLS_PEM_PARSE_C
   struct ssl_config_data *ssl_config = Curl_ssl_cf_get_config(cf, data);
-  const char * const ssl_cert_type = ssl_config->cert_type;
+  const char * const ssl_cert_type = ssl_config->primary.cert_type;
 #endif
   int ret = -1;
   char errorbuf[128];
@@ -581,7 +581,7 @@ static CURLcode mbed_load_clicert(struct Curl_cfilter *cf,
   char * const ssl_cert = ssl_config->primary.clientcert;
   const struct curl_blob *ssl_cert_blob = ssl_config->primary.cert_blob;
 #ifdef MBEDTLS_PEM_PARSE_C
-  const char * const ssl_cert_type = ssl_config->cert_type;
+  const char * const ssl_cert_type = ssl_config->primary.cert_type;
 #endif
   int ret = -1;
   char errorbuf[128];
@@ -662,12 +662,12 @@ static CURLcode mbed_load_privkey(struct Curl_cfilter *cf,
 
   mbedtls_pk_init(&backend->pk);
 
-  if(ssl_config->key || ssl_config->key_blob) {
-    if(ssl_config->key) {
+  if(ssl_config->primary.key || ssl_config->primary.key_blob) {
+    if(ssl_config->primary.key) {
 #ifdef MBEDTLS_FS_IO
 #if MBEDTLS_VERSION_NUMBER >= 0x04000000
-      ret = mbedtls_pk_parse_keyfile(&backend->pk, ssl_config->key,
-                                     ssl_config->key_passwd);
+      ret = mbedtls_pk_parse_keyfile(&backend->pk, ssl_config->primary.key,
+                                     ssl_config->primary.key_passwd);
       if(ret == 0 &&
          !(mbedtls_pk_can_do_psa(&backend->pk,
                                  PSA_ALG_RSA_PKCS1V15_SIGN(PSA_ALG_ANY_HASH),
@@ -677,8 +677,8 @@ static CURLcode mbed_load_privkey(struct Curl_cfilter *cf,
                                  PSA_KEY_USAGE_SIGN_HASH)))
         ret = MBEDTLS_ERR_PK_TYPE_MISMATCH;
 #else
-      ret = mbedtls_pk_parse_keyfile(&backend->pk, ssl_config->key,
-                                     ssl_config->key_passwd,
+      ret = mbedtls_pk_parse_keyfile(&backend->pk, ssl_config->primary.key,
+                                     ssl_config->primary.key_passwd,
                                      mbedtls_ctr_drbg_random,
                                      &rng.drbg);
       if(ret == 0 && !(mbedtls_pk_can_do(&backend->pk, MBEDTLS_PK_RSA) ||
@@ -689,7 +689,7 @@ static CURLcode mbed_load_privkey(struct Curl_cfilter *cf,
       if(ret) {
         mbedtls_strerror(ret, errorbuf, sizeof(errorbuf));
         failf(data, "mbedTLS: error reading private key %s: (-0x%04X) %s",
-              ssl_config->key, -ret, errorbuf);
+              ssl_config->primary.key, -ret, errorbuf);
         return CURLE_SSL_CERTPROBLEM;
       }
 #else
@@ -698,8 +698,8 @@ static CURLcode mbed_load_privkey(struct Curl_cfilter *cf,
 #endif
     }
     else {
-      const struct curl_blob *ssl_key_blob = ssl_config->key_blob;
-      const char *passwd = ssl_config->key_passwd;
+      const struct curl_blob *ssl_key_blob = ssl_config->primary.key_blob;
+      const char *passwd = ssl_config->primary.key_passwd;
       /* Unfortunately, mbedtls_pk_parse_key() requires the data to be
          null-terminated if the data is PEM encoded (even when provided the
          exact length). */
@@ -933,7 +933,7 @@ static CURLcode mbed_configure_ssl(struct Curl_cfilter *cf,
 #endif
     );
 
-  if(ssl_config->key || ssl_config->key_blob) {
+  if(ssl_config->primary.key || ssl_config->primary.key_blob) {
     mbedtls_ssl_conf_own_cert(&backend->config, &backend->clicert,
                               &backend->pk);
   }
index 2eeb2f349d2924ff5a489906d9305d33c134a6dd..2302ddacc66c704ca2028a29bb7c0ae2daaa429e 100644 (file)
@@ -3677,7 +3677,7 @@ CURLcode Curl_ossl_ctx_init(struct ossl_ctx *octx,
   struct ssl_config_data *ssl_config = Curl_ssl_cf_get_config(cf, data);
   char * const ssl_cert = ssl_config->primary.clientcert;
   const struct curl_blob *ssl_cert_blob = ssl_config->primary.cert_blob;
-  const char * const ssl_cert_type = ssl_config->cert_type;
+  const char * const ssl_cert_type = ssl_config->primary.cert_type;
   unsigned int ssl_version_min;
   char error_buffer[256];
 
@@ -3841,8 +3841,9 @@ CURLcode Curl_ossl_ctx_init(struct ossl_ctx *octx,
   if(ssl_cert || ssl_cert_blob || ssl_cert_type) {
     result = client_cert(data, octx->ssl_ctx,
                          ssl_cert, ssl_cert_blob, ssl_cert_type,
-                         ssl_config->key, ssl_config->key_blob,
-                         ssl_config->key_type, ssl_config->key_passwd);
+                         ssl_config->primary.key, ssl_config->primary.key_blob,
+                         ssl_config->primary.key_type,
+                         ssl_config->primary.key_passwd);
     if(result)
       /* failf() is already done in client_cert() */
       return result;
index 57591949527c0cf39567d9f35337310bab785daf..90a37cbedaea0c6e0bf31dcc5942b86d34e779ad 100644 (file)
@@ -845,14 +845,14 @@ init_config_builder_client_auth(struct Curl_easy *data,
   const struct rustls_certified_key *certified_key = NULL;
   CURLcode result = CURLE_OK;
 
-  if(conn_config->clientcert && !ssl_config->key) {
+  if(conn_config->clientcert && !ssl_config->primary.key) {
     failf(data, "rustls: must provide key with certificate '%s'",
           conn_config->clientcert);
     return CURLE_SSL_CERTPROBLEM;
   }
-  else if(!conn_config->clientcert && ssl_config->key) {
+  else if(!conn_config->clientcert && ssl_config->primary.key) {
     failf(data, "rustls: must provide certificate with key '%s'",
-          ssl_config->key);
+          ssl_config->primary.key);
     return CURLE_SSL_CERTPROBLEM;
   }
 
@@ -866,8 +866,9 @@ init_config_builder_client_auth(struct Curl_easy *data,
     goto cleanup;
   }
 
-  if(!read_file_into(ssl_config->key, &key_contents)) {
-    failf(data, "rustls: failed to read key file: '%s'", ssl_config->key);
+  if(!read_file_into(ssl_config->primary.key, &key_contents)) {
+    failf(data, "rustls: failed to read key file: '%s'",
+          ssl_config->primary.key);
     result = CURLE_SSL_CERTPROBLEM;
     goto cleanup;
   }
@@ -1066,7 +1067,7 @@ static CURLcode cr_init_backend(struct Curl_cfilter *cf,
     }
   }
 
-  if(conn_config->clientcert || ssl_config->key) {
+  if(conn_config->clientcert || ssl_config->primary.key) {
     result = init_config_builder_client_auth(data,
                                              conn_config,
                                              ssl_config,
index 9466de0e14d3d6320174e315609c87fd9575e4ff..e3b2263e594d9a6848bbb3bff4f465aaf4fe69de 100644 (file)
@@ -415,8 +415,8 @@ static CURLcode get_client_cert(struct Curl_easy *data,
       }
     }
 
-    if((fInCert || blob) && data->set.ssl.cert_type &&
-       !curl_strequal(data->set.ssl.cert_type, "P12")) {
+    if((fInCert || blob) && data->set.ssl.primary.cert_type &&
+       !curl_strequal(data->set.ssl.primary.cert_type, "P12")) {
       failf(data, "schannel: certificate format compatibility error "
             "for %s",
             blob ? "(memory blob)" : data->set.ssl.primary.clientcert);
@@ -466,15 +466,15 @@ static CURLcode get_client_cert(struct Curl_easy *data,
       datablob.pbData = (BYTE *)certdata;
       datablob.cbData = (DWORD)certsize;
 
-      if(data->set.ssl.key_passwd)
-        pwd_len = strlen(data->set.ssl.key_passwd);
+      if(data->set.ssl.primary.key_passwd)
+        pwd_len = strlen(data->set.ssl.primary.key_passwd);
       pszPassword = (WCHAR *)curlx_malloc(sizeof(WCHAR) * (pwd_len + 1));
       if(pszPassword) {
         int str_w_len = 0;
         if(pwd_len > 0)
           str_w_len = MultiByteToWideChar(CP_UTF8,
                                           MB_ERR_INVALID_CHARS,
-                                          data->set.ssl.key_passwd,
+                                          data->set.ssl.primary.key_passwd,
                                           (int)pwd_len,
                                           pszPassword, (int)(pwd_len + 1));
 
index 46005578794e4da8eb7553d5e08b637445da764d..73dd3f56f1db04508d75e77cfabcc0f216f6b909 100644 (file)
@@ -205,6 +205,7 @@ static bool match_ssl_primary_config(struct Curl_easy *data,
      blobcmp(c1->cert_blob, c2->cert_blob) &&
      blobcmp(c1->ca_info_blob, c2->ca_info_blob) &&
      blobcmp(c1->issuercert_blob, c2->issuercert_blob) &&
+     blobcmp(c1->key_blob, c2->key_blob) &&
      Curl_safecmp(c1->CApath, c2->CApath) &&
      Curl_safecmp(c1->CAfile, c2->CAfile) &&
      Curl_safecmp(c1->issuercert, c2->issuercert) &&
@@ -218,7 +219,11 @@ static bool match_ssl_primary_config(struct Curl_easy *data,
      curl_strequal(c1->curves, c2->curves) &&
      curl_strequal(c1->signature_algorithms, c2->signature_algorithms) &&
      Curl_safecmp(c1->CRLfile, c2->CRLfile) &&
-     Curl_safecmp(c1->pinned_key, c2->pinned_key))
+     Curl_safecmp(c1->pinned_key, c2->pinned_key) &&
+     curl_strequal(c1->cert_type, c2->cert_type) &&
+     Curl_safecmp(c1->key, c2->key) &&
+     curl_strequal(c1->key_type, c2->key_type) &&
+     !Curl_timestrcmp(c1->key_passwd, c2->key_passwd))
     return TRUE;
 
   return FALSE;
@@ -253,6 +258,7 @@ static bool clone_ssl_primary_config(struct ssl_primary_config *source,
   CLONE_BLOB(cert_blob);
   CLONE_BLOB(ca_info_blob);
   CLONE_BLOB(issuercert_blob);
+  CLONE_BLOB(key_blob);
   CLONE_STRING(CApath);
   CLONE_STRING(CAfile);
   CLONE_STRING(issuercert);
@@ -263,6 +269,10 @@ static bool clone_ssl_primary_config(struct ssl_primary_config *source,
   CLONE_STRING(curves);
   CLONE_STRING(signature_algorithms);
   CLONE_STRING(CRLfile);
+  CLONE_STRING(cert_type);
+  CLONE_STRING(key);
+  CLONE_STRING(key_type);
+  CLONE_STRING(key_passwd);
 #ifdef USE_TLS_SRP
   CLONE_STRING(username);
   CLONE_STRING(password);
@@ -283,9 +293,14 @@ static void free_primary_ssl_config(struct ssl_primary_config *sslc)
   curlx_safefree(sslc->cert_blob);
   curlx_safefree(sslc->ca_info_blob);
   curlx_safefree(sslc->issuercert_blob);
+  curlx_safefree(sslc->key_blob);
   curlx_safefree(sslc->curves);
   curlx_safefree(sslc->signature_algorithms);
   curlx_safefree(sslc->CRLfile);
+  curlx_safefree(sslc->cert_type);
+  curlx_safefree(sslc->key);
+  curlx_safefree(sslc->key_type);
+  curlx_safefree(sslc->key_passwd);
 #ifdef USE_TLS_SRP
   curlx_safefree(sslc->username);
   curlx_safefree(sslc->password);
@@ -337,12 +352,12 @@ CURLcode Curl_ssl_easy_config_complete(struct Curl_easy *data)
   sslc->primary.username = data->set.str[STRING_TLSAUTH_USERNAME];
   sslc->primary.password = data->set.str[STRING_TLSAUTH_PASSWORD];
 #endif
-  sslc->cert_type = data->set.str[STRING_CERT_TYPE];
-  sslc->key = data->set.str[STRING_KEY];
-  sslc->key_type = data->set.str[STRING_KEY_TYPE];
-  sslc->key_passwd = data->set.str[STRING_KEY_PASSWD];
+  sslc->primary.cert_type = data->set.str[STRING_CERT_TYPE];
+  sslc->primary.key = data->set.str[STRING_KEY];
+  sslc->primary.key_type = data->set.str[STRING_KEY_TYPE];
+  sslc->primary.key_passwd = data->set.str[STRING_KEY_PASSWD];
   sslc->primary.clientcert = data->set.str[STRING_CERT];
-  sslc->key_blob = data->set.blobs[BLOB_KEY];
+  sslc->primary.key_blob = data->set.blobs[BLOB_KEY];
 
 #ifndef CURL_DISABLE_PROXY
   sslc = &data->set.proxy_ssl;
@@ -378,12 +393,12 @@ CURLcode Curl_ssl_easy_config_complete(struct Curl_easy *data)
   sslc->primary.issuercert = data->set.str[STRING_SSL_ISSUERCERT_PROXY];
   sslc->primary.issuercert_blob = data->set.blobs[BLOB_SSL_ISSUERCERT_PROXY];
   sslc->primary.CRLfile = data->set.str[STRING_SSL_CRLFILE_PROXY];
-  sslc->cert_type = data->set.str[STRING_CERT_TYPE_PROXY];
-  sslc->key = data->set.str[STRING_KEY_PROXY];
-  sslc->key_type = data->set.str[STRING_KEY_TYPE_PROXY];
-  sslc->key_passwd = data->set.str[STRING_KEY_PASSWD_PROXY];
+  sslc->primary.cert_type = data->set.str[STRING_CERT_TYPE_PROXY];
+  sslc->primary.key = data->set.str[STRING_KEY_PROXY];
+  sslc->primary.key_type = data->set.str[STRING_KEY_TYPE_PROXY];
+  sslc->primary.key_passwd = data->set.str[STRING_KEY_PASSWD_PROXY];
   sslc->primary.clientcert = data->set.str[STRING_CERT_PROXY];
-  sslc->key_blob = data->set.blobs[BLOB_KEY_PROXY];
+  sslc->primary.key_blob = data->set.blobs[BLOB_KEY_PROXY];
 #ifdef USE_TLS_SRP
   sslc->primary.username = data->set.str[STRING_TLSAUTH_USERNAME_PROXY];
   sslc->primary.password = data->set.str[STRING_TLSAUTH_PASSWORD_PROXY];
index 88593b20ae27e5bf6ec93e68d01256d3d979fd25..2fc563e800bd5a6002ba9a80da9b74c3a43abbd8 100644 (file)
@@ -50,6 +50,7 @@
 struct Curl_ssl_scache_peer {
   char *ssl_peer_key;      /* id for peer + relevant TLS configuration */
   char *clientcert;
+  char *key_passwd;
   char *srp_username;
   char *srp_password;
   struct Curl_llist sessions;
@@ -123,6 +124,48 @@ out:
   return result;
 }
 
+static CURLcode cf_ssl_peer_key_add_mtls(struct dynbuf *buf,
+                                         struct ssl_primary_config *ssl,
+                                         bool *is_local)
+{
+  CURLcode result = CURLE_OK;
+  if(ssl->clientcert && ssl->clientcert[0]) {
+    result = cf_ssl_peer_key_add_path(buf, "CCERT", ssl->clientcert, is_local);
+    if(result)
+      goto out;
+  }
+  if(ssl->key && ssl->key[0]) {
+    result = cf_ssl_peer_key_add_path(buf, "KEY", ssl->key, is_local);
+    if(result)
+      goto out;
+  }
+  if(ssl->key_blob) {
+    result = cf_ssl_peer_key_add_hash(buf, "KEYBlob", ssl->key_blob);
+    if(result)
+      goto out;
+  }
+  if(ssl->cert_type && ssl->cert_type[0]) {
+    size_t i;
+    result = curlx_dyn_add(buf, ":CT-");
+    for(i = 0; !result && ssl->cert_type[i]; i++) {
+      char c = Curl_raw_toupper(ssl->cert_type[i]);
+      result = curlx_dyn_addn(buf, &c, 1);
+    }
+    if(result)
+      goto out;
+  }
+  if(ssl->key_type && ssl->key_type[0]) {
+    size_t i;
+    result = curlx_dyn_add(buf, ":KT-");
+    for(i = 0; !result && ssl->key_type[i]; i++) {
+      char c = Curl_raw_toupper(ssl->key_type[i]);
+      result = curlx_dyn_addn(buf, &c, 1);
+    }
+  }
+out:
+  return result;
+}
+
 #define CURL_SSLS_LOCAL_SUFFIX     ":L"
 #define CURL_SSLS_GLOBAL_SUFFIX    ":G"
 
@@ -134,12 +177,12 @@ static bool cf_ssl_peer_key_is_global(const char *peer_key)
          (peer_key[len - 2] == ':');
 }
 
-CURLcode Curl_ssl_peer_key_make(struct Curl_cfilter *cf,
-                                const struct ssl_peer *peer,
-                                const char *tls_id,
-                                char **ppeer_key)
+CURLcode Curl_ssl_peer_key_build(struct ssl_primary_config *ssl,
+                                 const struct ssl_peer *peer,
+                                 const struct Curl_peer *via_peer,
+                                 const char *tls_id,
+                                 char **ppeer_key)
 {
-  struct ssl_primary_config *ssl = Curl_ssl_cf_get_primary_config(cf);
   struct dynbuf buf;
   size_t key_len;
   bool is_local = FALSE;
@@ -188,10 +231,10 @@ CURLcode Curl_ssl_peer_key_make(struct Curl_cfilter *cf,
       goto out;
   }
   if(!ssl->verifypeer || !ssl->verifyhost) {
-    if(cf->conn->via_peer) {
+    if(via_peer) {
       result = curlx_dyn_addf(&buf, ":CHOST-%s:CPORT-%u",
-                              cf->conn->via_peer->hostname,
-                              cf->conn->via_peer->port);
+                              via_peer->hostname,
+                              via_peer->port);
       if(result)
         goto out;
     }
@@ -266,11 +309,9 @@ CURLcode Curl_ssl_peer_key_make(struct Curl_cfilter *cf,
       goto out;
   }
 
-  if(ssl->clientcert && ssl->clientcert[0]) {
-    result = curlx_dyn_add(&buf, ":CCERT");
-    if(result)
-      goto out;
-  }
+  result = cf_ssl_peer_key_add_mtls(&buf, ssl, &is_local);
+  if(result)
+    goto out;
 #ifdef USE_TLS_SRP
   if(ssl->username || ssl->password) {
     result = curlx_dyn_add(&buf, ":SRP-AUTH");
@@ -301,6 +342,16 @@ out:
   return result;
 }
 
+CURLcode Curl_ssl_peer_key_make(struct Curl_cfilter *cf,
+                                const struct ssl_peer *peer,
+                                const char *tls_id,
+                                char **ppeer_key)
+{
+  struct ssl_primary_config *ssl = Curl_ssl_cf_get_primary_config(cf);
+  return Curl_ssl_peer_key_build(ssl, peer, cf->conn->via_peer, tls_id,
+                                 ppeer_key);
+}
+
 struct Curl_ssl_scache {
   unsigned int magic;
   struct Curl_ssl_scache_peer *peers;
@@ -409,6 +460,7 @@ static void cf_ssl_scache_clear_peer(struct Curl_ssl_scache_peer *peer)
   }
   peer->sobj_free = NULL;
   curlx_safefree(peer->clientcert);
+  curlx_safefree(peer->key_passwd);
 #ifdef USE_TLS_SRP
   curlx_safefree(peer->srp_username);
   curlx_safefree(peer->srp_password);
@@ -437,8 +489,8 @@ static void cf_ssl_cache_peer_update(struct Curl_ssl_scache_peer *peer)
    * - its peer key is not yet known, because sessions were
    *   imported using only the salt+hmac
    * - the peer key is global, e.g. carrying no relative paths */
-  peer->exportable = (!peer->clientcert && !peer->srp_username &&
-                      !peer->srp_password &&
+  peer->exportable = (!peer->clientcert && !peer->key_passwd &&
+                      !peer->srp_username && !peer->srp_password &&
                       (!peer->ssl_peer_key ||
                        cf_ssl_peer_key_is_global(peer->ssl_peer_key)));
 }
@@ -447,6 +499,7 @@ static CURLcode
 cf_ssl_scache_peer_init(struct Curl_ssl_scache_peer *peer,
                         const char *ssl_peer_key,
                         const char *clientcert,
+                        const char *key_passwd,
                         const char *srp_username,
                         const char *srp_password,
                         const unsigned char *salt,
@@ -475,6 +528,11 @@ cf_ssl_scache_peer_init(struct Curl_ssl_scache_peer *peer,
     if(!peer->clientcert)
       goto out;
   }
+  if(key_passwd) {
+    peer->key_passwd = curlx_strdup(key_passwd);
+    if(!peer->key_passwd)
+      goto out;
+  }
   if(srp_username) {
     peer->srp_username = curlx_strdup(srp_username);
     if(!peer->srp_username)
@@ -616,7 +674,7 @@ static bool cf_ssl_scache_match_auth(struct Curl_ssl_scache_peer *peer,
                                      struct ssl_primary_config *conn_config)
 {
   if(!conn_config) {
-    if(peer->clientcert)
+    if(peer->clientcert || peer->key_passwd)
       return FALSE;
 #ifdef USE_TLS_SRP
     if(peer->srp_username || peer->srp_password)
@@ -626,6 +684,8 @@ static bool cf_ssl_scache_match_auth(struct Curl_ssl_scache_peer *peer,
   }
   else if(!Curl_safecmp(peer->clientcert, conn_config->clientcert))
     return FALSE;
+  if(Curl_timestrcmp(peer->key_passwd, conn_config->key_passwd))
+    return FALSE;
 #ifdef USE_TLS_SRP
   if(Curl_timestrcmp(peer->srp_username, conn_config->username) ||
      Curl_timestrcmp(peer->srp_password, conn_config->password))
@@ -754,6 +814,7 @@ static CURLcode cf_ssl_add_peer(struct Curl_easy *data,
   if(peer) {
     char buffer[64];
     const char *ccert = conn_config ? conn_config->clientcert : NULL;
+    const char *kpasswd = conn_config ? conn_config->key_passwd : NULL;
     const char *username = NULL, *password = NULL;
 #ifdef USE_TLS_SRP
     username = conn_config ? conn_config->username : NULL;
@@ -765,7 +826,7 @@ static CURLcode cf_ssl_add_peer(struct Curl_easy *data,
                      "cert-%p", conn_config->cert_blob->data);
       ccert = buffer; /* data is strduped by cf_ssl_scache_peer_init */
     }
-    result = cf_ssl_scache_peer_init(peer, ssl_peer_key, ccert,
+    result = cf_ssl_scache_peer_init(peer, ssl_peer_key, ccert, kpasswd,
                                      username, password, NULL, NULL);
     if(result)
       goto out;
@@ -1144,7 +1205,7 @@ CURLcode Curl_ssl_session_import(struct Curl_easy *data,
     if(!peer) {
       peer = cf_ssl_get_free_peer(scache);
       if(peer) {
-        result = cf_ssl_scache_peer_init(peer, ssl_peer_key, NULL,
+        result = cf_ssl_scache_peer_init(peer, ssl_peer_key, NULL, NULL,
                                          NULL, NULL, salt, hmac);
         if(result)
           goto out;
index a6a36f16306b3e083478c8cda93f7e4d38fc18e7..cf270ba413a0a37b3aff9094b4325cba00a11c35 100644 (file)
@@ -66,6 +66,22 @@ CURLcode Curl_ssl_peer_key_make(struct Curl_cfilter *cf,
                                 const char *tls_id,
                                 char **ppeer_key);
 
+/**
+ * Like Curl_ssl_peer_key_make() but takes the primary config and peer
+ * descriptors directly, without requiring a Curl_cfilter. Exposed for
+ * unit testing.
+ * @param ssl      the primary SSL config to key on
+ * @param peer     the peer the filter wants to talk to
+ * @param via_peer the connecting-through peer, or NULL
+ * @param tls_id   identifier of TLS implementation for sessions
+ * @param ppeer_key on successful return, the key generated
+ */
+CURLcode Curl_ssl_peer_key_build(struct ssl_primary_config *ssl,
+                                 const struct ssl_peer *peer,
+                                 const struct Curl_peer *via_peer,
+                                 const char *tls_id,
+                                 char **ppeer_key);
+
 /* Return if there is a session cache shall be used.
  * An ssl session might not be configured or not available for
  * "connect-only" transfers.
index 59574c9b6a78984eab0e18ffd84fdb13cd2003f8..90fc33173dc18d4ba36d01dbfaae2fa1c44e59bb 100644 (file)
@@ -920,10 +920,10 @@ static CURLcode wssl_client_cert(struct Curl_easy *data,
 #ifndef NO_FILESYSTEM
   if(ssl_config->primary.cert_blob || ssl_config->primary.clientcert) {
     const char *cert_file = ssl_config->primary.clientcert;
-    const char *key_file = ssl_config->key;
+    const char *key_file = ssl_config->primary.key;
     const struct curl_blob *cert_blob = ssl_config->primary.cert_blob;
-    const struct curl_blob *key_blob = ssl_config->key_blob;
-    int file_type = wssl_do_file_type(ssl_config->cert_type);
+    const struct curl_blob *key_blob = ssl_config->primary.key_blob;
+    int file_type = wssl_do_file_type(ssl_config->primary.cert_type);
     int rc;
 
     switch(file_type) {
@@ -954,7 +954,7 @@ static CURLcode wssl_client_cert(struct Curl_easy *data,
       key_file = cert_file;
     }
     else
-      file_type = wssl_do_file_type(ssl_config->key_type);
+      file_type = wssl_do_file_type(ssl_config->primary.key_type);
 
     rc = key_blob ?
       wolfSSL_CTX_use_PrivateKey_buffer(wctx->ssl_ctx, key_blob->data,
@@ -968,8 +968,8 @@ static CURLcode wssl_client_cert(struct Curl_easy *data,
 #else /* NO_FILESYSTEM */
   if(ssl_config->primary.cert_blob) {
     const struct curl_blob *cert_blob = ssl_config->primary.cert_blob;
-    const struct curl_blob *key_blob = ssl_config->key_blob;
-    int file_type = wssl_do_file_type(ssl_config->cert_type);
+    const struct curl_blob *key_blob = ssl_config->primary.key_blob;
+    int file_type = wssl_do_file_type(ssl_config->primary.cert_type);
     int rc;
 
     switch(file_type) {
@@ -994,7 +994,7 @@ static CURLcode wssl_client_cert(struct Curl_easy *data,
     if(!key_blob)
       key_blob = cert_blob;
     else
-      file_type = wssl_do_file_type(ssl_config->key_type);
+      file_type = wssl_do_file_type(ssl_config->primary.key_type);
 
     if(wolfSSL_CTX_use_PrivateKey_buffer(wctx->ssl_ctx, key_blob->data,
                                          (long)key_blob->len,
index a3778bdad1d34a13c9b72da8557761e3ae049b0e..cde5c28736985b62ffdf7b321c0a81e89cac5960 100644 (file)
@@ -287,7 +287,7 @@ test3200 test3201 test3202 test3203 test3204 test3205 test3206 test3207 \
 test3208 test3209 test3210 test3211 test3212 test3213 test3214 test3215 \
 test3216 test3217 test3218 test3219 test3220 \
 \
-test3300 test3301 test3302 \
+test3300 test3301 test3302 test3303 test3304 \
 \
 test4000 test4001
 
diff --git a/tests/data/test3303 b/tests/data/test3303
new file mode 100644 (file)
index 0000000..697049f
--- /dev/null
@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="US-ASCII"?>
+<testcase>
+<info>
+<keywords>
+unittest
+TLS
+mTLS
+</keywords>
+</info>
+
+# Client-side
+<client>
+<features>
+unittest
+</features>
+<name>
+conn-reuse match distinguishes mTLS key, cert_type, key_type and key_passwd fields
+</name>
+</client>
+</testcase>
diff --git a/tests/data/test3304 b/tests/data/test3304
new file mode 100644 (file)
index 0000000..4380c08
--- /dev/null
@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="US-ASCII"?>
+<testcase>
+<info>
+<keywords>
+unittest
+TLS
+mTLS
+</keywords>
+</info>
+
+# Client-side
+<client>
+<features>
+unittest
+</features>
+<name>
+TLS session cache peer key discriminates on mTLS key, key_type and cert_type fields
+</name>
+</client>
+</testcase>
index b474f3d7fcd4d9f36c7cae12a73fd8db6e8eba26..c8eccd27ad4d2cdf722924012acc3c259aeb8409 100644 (file)
@@ -47,4 +47,4 @@ TESTS_C = \
   unit2600.c unit2601.c unit2602.c unit2603.c unit2604.c unit2605.c \
   unit3200.c                                             unit3205.c \
   unit3211.c unit3212.c unit3213.c unit3214.c            unit3216.c unit3219.c \
-  unit3300.c unit3301.c unit3302.c
+  unit3300.c unit3301.c unit3302.c unit3303.c unit3304.c
diff --git a/tests/unit/unit3303.c b/tests/unit/unit3303.c
new file mode 100644 (file)
index 0000000..41bced5
--- /dev/null
@@ -0,0 +1,127 @@
+/***************************************************************************
+ *                                  _   _ ____  _
+ *  Project                     ___| | | |  _ \| |
+ *                             / __| | | | |_) | |
+ *                            | (__| |_| |  _ <| |___
+ *                             \___|\___/|_| \_\_____|
+ *
+ * Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
+ *
+ * This software is licensed as described in the file COPYING, which
+ * you should have received as part of this distribution. The terms
+ * are also available at https://curl.se/docs/copyright.html.
+ *
+ * You may opt to use, copy, modify, merge, publish, distribute and/or sell
+ * copies of the Software, and permit persons to whom the Software is
+ * furnished to do so, under the terms of the COPYING file.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ * SPDX-License-Identifier: curl
+ *
+ ***************************************************************************/
+#include "unitcheck.h"
+#include "urldata.h"
+
+#ifdef USE_SSL
+#include "vtls/vtls.h"
+#endif
+
+static CURLcode test_unit3303(const char *arg)
+{
+  UNITTEST_BEGIN_SIMPLE
+
+#ifdef USE_SSL
+  {
+    CURL *curl;
+    struct connectdata *conn;
+    struct ssl_primary_config *primary;
+    char *saved;
+    static char alt_passwd[] = "wrong";
+    static char alt_key[]    = "other.key";
+    static char alt_ktype[]  = "DER";
+    static char alt_ctype[]  = "P12";
+
+    curl_global_init(CURL_GLOBAL_ALL);
+    curl = curl_easy_init();
+    if(!curl) {
+      curl_global_cleanup();
+      goto unit_test_abort;
+    }
+
+    curl_easy_setopt(curl, CURLOPT_SSLCERT, "client.pem");
+    curl_easy_setopt(curl, CURLOPT_SSLKEY, "client.key");
+    curl_easy_setopt(curl, CURLOPT_KEYPASSWD, "secret");
+    curl_easy_setopt(curl, CURLOPT_SSLCERTTYPE, "PEM");
+    curl_easy_setopt(curl, CURLOPT_SSLKEYTYPE, "PEM");
+
+    if(Curl_ssl_easy_config_complete((struct Curl_easy *)curl)) {
+      curl_easy_cleanup(curl);
+      curl_global_cleanup();
+      goto unit_test_abort;
+    }
+
+    conn = curlx_calloc(1, sizeof(*conn));
+    if(!conn || Curl_ssl_conn_config_init((struct Curl_easy *)curl, conn)) {
+      if(conn)
+        Curl_ssl_conn_config_cleanup(conn);
+      curlx_free(conn);
+      curl_easy_cleanup(curl);
+      curl_global_cleanup();
+      goto unit_test_abort;
+    }
+
+    /* Baseline: identical config must match. */
+    fail_unless(Curl_ssl_conn_config_match((struct Curl_easy *)curl, conn,
+                                           FALSE),
+                "identical mTLS config should match");
+
+    primary = &((struct Curl_easy *)curl)->set.ssl.primary;
+
+    /* Different key_passwd must not match. */
+    saved = primary->key_passwd;
+    primary->key_passwd = alt_passwd;
+    fail_unless(!Curl_ssl_conn_config_match((struct Curl_easy *)curl, conn,
+                                            FALSE),
+                "different key_passwd must not reuse conn");
+    primary->key_passwd = saved;
+
+    /* Different key path must not match. */
+    saved = primary->key;
+    primary->key = alt_key;
+    fail_unless(!Curl_ssl_conn_config_match((struct Curl_easy *)curl, conn,
+                                            FALSE),
+                "different key must not reuse conn");
+    primary->key = saved;
+
+    /* Different key type must not match. */
+    saved = primary->key_type;
+    primary->key_type = alt_ktype;
+    fail_unless(!Curl_ssl_conn_config_match((struct Curl_easy *)curl, conn,
+                                            FALSE),
+                "different key_type must not reuse conn");
+    primary->key_type = saved;
+
+    /* Different cert type must not match. */
+    saved = primary->cert_type;
+    primary->cert_type = alt_ctype;
+    fail_unless(!Curl_ssl_conn_config_match((struct Curl_easy *)curl, conn,
+                                            FALSE),
+                "different cert_type must not reuse conn");
+    primary->cert_type = saved;
+
+    /* All fields restored: must match again. */
+    fail_unless(Curl_ssl_conn_config_match((struct Curl_easy *)curl, conn,
+                                           FALSE),
+                "restored mTLS config should match");
+
+    Curl_ssl_conn_config_cleanup(conn);
+    curlx_free(conn);
+    curl_easy_cleanup(curl);
+    curl_global_cleanup();
+  }
+#endif /* USE_SSL */
+
+  UNITTEST_END_SIMPLE
+}
diff --git a/tests/unit/unit3304.c b/tests/unit/unit3304.c
new file mode 100644 (file)
index 0000000..7c39c60
--- /dev/null
@@ -0,0 +1,168 @@
+/***************************************************************************
+ *                                  _   _ ____  _
+ *  Project                     ___| | | |  _ \| |
+ *                             / __| | | | |_) | |
+ *                            | (__| |_| |  _ <| |___
+ *                             \___|\___/|_| \_\_____|
+ *
+ * Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
+ *
+ * This software is licensed as described in the file COPYING, which
+ * you should have received as part of this distribution. The terms
+ * are also available at https://curl.se/docs/copyright.html.
+ *
+ * You may opt to use, copy, modify, merge, publish, distribute and/or sell
+ * copies of the Software, and permit persons to whom the Software is
+ * furnished to do so, under the terms of the COPYING file.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ * SPDX-License-Identifier: curl
+ *
+ ***************************************************************************/
+
+/* Unit tests for TLS session cache peer key discrimination on mTLS fields.
+ * Verifies that Curl_ssl_peer_key_build() produces distinct keys when two
+ * handles differ only on key, key_type or cert_type.  key_passwd is NOT
+ * embedded in the peer key; it is compared separately at session lookup via
+ * cf_ssl_scache_match_auth(), following the same pattern as SRP
+ * credentials. */
+
+#include "unitcheck.h"
+#include "urldata.h"
+#include "peer.h"
+
+#ifdef USE_SSL
+#include "vtls/vtls.h"
+#include "vtls/vtls_scache.h"
+#endif
+
+static CURLcode test_unit3304(const char *arg)
+{
+  UNITTEST_BEGIN_SIMPLE
+
+#ifdef USE_SSL
+  {
+    struct Curl_peer dest;
+    struct ssl_peer peer;
+    struct ssl_primary_config ssl;
+    char *key1 = NULL;
+    char *key2 = NULL;
+    static char base_hostname[] = "example.com";
+    static char base_cert[]     = "client.pem";
+    static char base_key[]      = "client.key";
+    static char base_passwd[]   = "secret";
+    static char base_ctype[]    = "PEM";
+    static char base_ktype[]    = "PEM";
+    static char alt_key[]       = "other.key";
+    static char alt_ktype[]     = "DER";
+    static char alt_ctype[]     = "P12";
+    static char lc_ctype[]      = "pem";
+    static char lc_ktype[]      = "pem";
+
+    memset(&dest, 0, sizeof(dest));
+    dest.hostname = base_hostname;
+    dest.port = 443;
+
+    memset(&peer, 0, sizeof(peer));
+    peer.dest = &dest;
+    peer.transport = TRNSPRT_TCP;
+
+    memset(&ssl, 0, sizeof(ssl));
+    ssl.verifypeer = TRUE;
+    ssl.verifyhost = TRUE;
+    ssl.clientcert = base_cert;
+    ssl.key        = base_key;
+    ssl.key_passwd = base_passwd;
+    ssl.cert_type  = base_ctype;
+    ssl.key_type   = base_ktype;
+
+    /* Baseline: same config produces same key. */
+    fail_unless(!Curl_ssl_peer_key_build(&ssl, &peer, NULL, "test", &key1),
+                "peer key build failed");
+    fail_unless(!Curl_ssl_peer_key_build(&ssl, &peer, NULL, "test", &key2),
+                "peer key build failed");
+    fail_unless(key1 && key2 && !strcmp(key1, key2),
+                "identical config should produce identical peer key");
+    curlx_free(key1); key1 = NULL;
+    curlx_free(key2); key2 = NULL;
+
+    /* key_passwd is NOT in the peer key: lookup uses timing-safe comparison
+     * via cf_ssl_scache_match_auth(), same as SRP credentials. */
+    fail_unless(!Curl_ssl_peer_key_build(&ssl, &peer, NULL, "test", &key1),
+                "peer key build failed");
+    ssl.key_passwd = NULL;
+    fail_unless(!Curl_ssl_peer_key_build(&ssl, &peer, NULL, "test", &key2),
+                "peer key build failed");
+    fail_unless(key1 && key2 && !strcmp(key1, key2),
+                "key_passwd must not affect the peer key");
+    curlx_free(key1); key1 = NULL;
+    curlx_free(key2); key2 = NULL;
+    ssl.key_passwd = base_passwd;
+
+    /* Different key path must produce a different peer key. */
+    fail_unless(!Curl_ssl_peer_key_build(&ssl, &peer, NULL, "test", &key1),
+                "peer key build failed");
+    ssl.key = alt_key;
+    fail_unless(!Curl_ssl_peer_key_build(&ssl, &peer, NULL, "test", &key2),
+                "peer key build failed");
+    fail_unless(key1 && key2 && strcmp(key1, key2),
+                "different key must produce different peer key");
+    curlx_free(key1); key1 = NULL;
+    curlx_free(key2); key2 = NULL;
+    ssl.key = base_key;
+
+    /* Different key_type must produce a different peer key. */
+    fail_unless(!Curl_ssl_peer_key_build(&ssl, &peer, NULL, "test", &key1),
+                "peer key build failed");
+    ssl.key_type = alt_ktype;
+    fail_unless(!Curl_ssl_peer_key_build(&ssl, &peer, NULL, "test", &key2),
+                "peer key build failed");
+    fail_unless(key1 && key2 && strcmp(key1, key2),
+                "different key_type must produce different peer key");
+    curlx_free(key1); key1 = NULL;
+    curlx_free(key2); key2 = NULL;
+    ssl.key_type = base_ktype;
+
+    /* Different cert_type must produce a different peer key. */
+    fail_unless(!Curl_ssl_peer_key_build(&ssl, &peer, NULL, "test", &key1),
+                "peer key build failed");
+    ssl.cert_type = alt_ctype;
+    fail_unless(!Curl_ssl_peer_key_build(&ssl, &peer, NULL, "test", &key2),
+                "peer key build failed");
+    fail_unless(key1 && key2 && strcmp(key1, key2),
+                "different cert_type must produce different peer key");
+    curlx_free(key1); key1 = NULL;
+    curlx_free(key2); key2 = NULL;
+    ssl.cert_type = base_ctype;
+
+    /* cert_type is case-insensitive: "PEM" and "pem" must produce the
+     * same peer key, consistent with the conn-reuse comparison. */
+    fail_unless(!Curl_ssl_peer_key_build(&ssl, &peer, NULL, "test", &key1),
+                "peer key build failed");
+    ssl.cert_type = lc_ctype;
+    fail_unless(!Curl_ssl_peer_key_build(&ssl, &peer, NULL, "test", &key2),
+                "peer key build failed");
+    fail_unless(key1 && key2 && !strcmp(key1, key2),
+                "cert_type case must not affect peer key");
+    curlx_free(key1); key1 = NULL;
+    curlx_free(key2); key2 = NULL;
+    ssl.cert_type = base_ctype;
+
+    /* key_type is case-insensitive: "PEM" and "pem" must produce the
+     * same peer key. */
+    fail_unless(!Curl_ssl_peer_key_build(&ssl, &peer, NULL, "test", &key1),
+                "peer key build failed");
+    ssl.key_type = lc_ktype;
+    fail_unless(!Curl_ssl_peer_key_build(&ssl, &peer, NULL, "test", &key2),
+                "peer key build failed");
+    fail_unless(key1 && key2 && !strcmp(key1, key2),
+                "key_type case must not affect peer key");
+    curlx_free(key1); key1 = NULL;
+    curlx_free(key2); key2 = NULL;
+  }
+#endif /* USE_SSL */
+
+  UNITTEST_END_SIMPLE
+}