commit b9ad88be0304136c3fe5959c65a5d2c75490cd80
author Christian Heimes <christian@python.org> Fri Apr 23 13:51:40 2021 +0200
committer GitHub <noreply@github.com> Fri Apr 23 13:51:40 2021 +0200
tree a673b6281bb29aa7cd194c0184804f1aeabd7933
parent e9194ea6eaa18299d6ccbd3555ce150fab0c6184

bpo-43920: Make load_verify_locations(cadata) error message consistent (GH-25554)

Signed-off-by: Christian Heimes <christian@python.org>

Modules/_ssl.c

diff --git a/Modules/_ssl.c b/Modules/_ssl.c
index e28c128..0daa13e 100644
--- a/Modules/_ssl.c
+++ b/Modules/_ssl.c
@@ -3791,7 +3791,7 @@ _add_ca_certs(PySSLContext *self, const void *data, Py_ssize_t len,
 {
     BIO *biobuf = NULL;
     X509_STORE *store;
-    int retval = 0, err, loaded = 0;
+    int retval = -1, err, loaded = 0;
 
     assert(filetype == SSL_FILETYPE_ASN1 || filetype == SSL_FILETYPE_PEM);
 
@@ -3845,23 +3845,32 @@ _add_ca_certs(PySSLContext *self, const void *data, Py_ssize_t len,
     }
 
     err = ERR_peek_last_error();
-    if ((filetype == SSL_FILETYPE_ASN1) &&
-            (loaded > 0) &&
-            (ERR_GET_LIB(err) == ERR_LIB_ASN1) &&
-            (ERR_GET_REASON(err) == ASN1_R_HEADER_TOO_LONG)) {
+    if (loaded == 0) {
+        const char *msg = NULL;
+        if (filetype == SSL_FILETYPE_PEM) {
+            msg = "no start line: cadata does not contain a certificate";
+        } else {
+            msg = "not enough data: cadata does not contain a certificate";
+        }
+        _setSSLError(get_state_ctx(self), msg, 0, __FILE__, __LINE__);
+        retval = -1;
+    } else if ((filetype == SSL_FILETYPE_ASN1) &&
+                    (ERR_GET_LIB(err) == ERR_LIB_ASN1) &&
+                    (ERR_GET_REASON(err) == ASN1_R_HEADER_TOO_LONG)) {
         /* EOF ASN1 file, not an error */
         ERR_clear_error();
         retval = 0;
     } else if ((filetype == SSL_FILETYPE_PEM) &&
-                   (loaded > 0) &&
                    (ERR_GET_LIB(err) == ERR_LIB_PEM) &&
                    (ERR_GET_REASON(err) == PEM_R_NO_START_LINE)) {
         /* EOF PEM file, not an error */
         ERR_clear_error();
         retval = 0;
-    } else {
+    } else if (err != 0) {
         _setSSLError(get_state_ctx(self), NULL, 0, __FILE__, __LINE__);
         retval = -1;
+    } else {
+        retval = 0;
     }
 
     BIO_free(biobuf);