Fix compilation with OpenSSL 4

OpenSSL 4.0.0 changed some parameters and returnvalues to const, so
we need to update our declarations and subsequently cast away const-
ness from a few callsites to make libpq build without warnings. This
is tested with OpenSSL 1.1.1 through 4.0.0 as well as with LibreSSL.
No functional change is introduced, this commit only allows postgres
to be compiled against OpenSSL 4.0.0 without warnings.

There is also an errormessage change in OpenSSL 4.0.0 which needed
to be covered by our testharness.

This will be backpatched to all supported branches since they are
all equally likely to be built against OpenSSL 4.0.0 as it becomes
available in distributions.  Backpatching will be done once it has
been in master for a few days without issues.

Author: Daniel Gustafsson <daniel@yesql.se>
Reviewed-by: Michael Paquier <michael@paquier.xyz>
Discussion: https://postgr.es/m/066B07BB-85FA-487C-BE8C-40F791CFC3C4@yesql.se
Backpatch-through: 14

diff --git a/contrib/sslinfo/sslinfo.c b/contrib/sslinfo/sslinfo.c
index 5fd46b9874138d407bc97cbff627153b4a336162..4251ccfd1740c8c51652f33285654c7dbce8dcfd 100644 (file)
--- a/contrib/sslinfo/sslinfo.c
+++ b/contrib/sslinfo/sslinfo.c
@@ -32,8 +32,8 @@
 
 PG_MODULE_MAGIC;
 
-static Datum X509_NAME_field_to_text(X509_NAME *name, text *fieldName);
-static Datum ASN1_STRING_to_text(ASN1_STRING *str);
+static Datum X509_NAME_field_to_text(const X509_NAME *name, text *fieldName);
+static Datum ASN1_STRING_to_text(const ASN1_STRING *str);
 
 /*
  * Function context for data persisting over repeated calls.
@@ -156,7 +156,7 @@ ssl_client_serial(PG_FUNCTION_ARGS)
  * function.
  */
 static Datum
-ASN1_STRING_to_text(ASN1_STRING *str)
+ASN1_STRING_to_text(const ASN1_STRING *str)
 {
        BIO                *membuf;
        size_t          size;
@@ -171,7 +171,7 @@ ASN1_STRING_to_text(ASN1_STRING *str)
                                (errcode(ERRCODE_OUT_OF_MEMORY),
                                 errmsg("could not create OpenSSL BIO structure")));
        (void) BIO_set_close(membuf, BIO_CLOSE);
-       ASN1_STRING_print_ex(membuf, str,
+       ASN1_STRING_print_ex(membuf, unconstify(ASN1_STRING *, str),
                                                 ((ASN1_STRFLGS_RFC2253 & ~ASN1_STRFLGS_ESC_MSB)
                                                  | ASN1_STRFLGS_UTF8_CONVERT));
        /* ensure null termination of the BIO's content */
@@ -202,12 +202,12 @@ ASN1_STRING_to_text(ASN1_STRING *str)
  * part of name
  */
 static Datum
-X509_NAME_field_to_text(X509_NAME *name, text *fieldName)
+X509_NAME_field_to_text(const X509_NAME *name, text *fieldName)
 {
        char       *string_fieldname;
        int                     nid,
                                index;
-       ASN1_STRING *data;
+       const ASN1_STRING *data;
 
        string_fieldname = text_to_cstring(fieldName);
        nid = OBJ_txt2nid(string_fieldname);
@@ -217,10 +217,10 @@ X509_NAME_field_to_text(X509_NAME *name, text *fieldName)
                                 errmsg("invalid X.509 field name: \"%s\"",
                                                string_fieldname)));
        pfree(string_fieldname);
-       index = X509_NAME_get_index_by_NID(name, nid, -1);
+       index = X509_NAME_get_index_by_NID(unconstify(X509_NAME *, name), nid, -1);
        if (index < 0)
                return (Datum) 0;
-       data = X509_NAME_ENTRY_get_data(X509_NAME_get_entry(name, index));
+       data = X509_NAME_ENTRY_get_data(X509_NAME_get_entry(unconstify(X509_NAME *, name), index));
        return ASN1_STRING_to_text(data);
 }
 
@@ -429,8 +429,8 @@ ssl_extension_info(PG_FUNCTION_ARGS)
                HeapTuple       tuple;
                Datum           result;
                BIO                *membuf;
-               X509_EXTENSION *ext;
-               ASN1_OBJECT *obj;
+               const X509_EXTENSION *ext;
+               const ASN1_OBJECT *obj;
                int                     nid;
                int                     len;
 
@@ -443,7 +443,7 @@ ssl_extension_info(PG_FUNCTION_ARGS)
 
                /* Get the extension from the certificate */
                ext = X509_get_ext(cert, call_cntr);
-               obj = X509_EXTENSION_get_object(ext);
+               obj = X509_EXTENSION_get_object(unconstify(X509_EXTENSION *, ext));
 
                /* Get the extension name */
                nid = OBJ_obj2nid(obj);
@@ -456,7 +456,7 @@ ssl_extension_info(PG_FUNCTION_ARGS)
                nulls[0] = false;
 
                /* Get the extension value */
-               if (X509V3_EXT_print(membuf, ext, 0, 0) <= 0)
+               if (X509V3_EXT_print(membuf, unconstify(X509_EXTENSION *, ext), 0, 0) <= 0)
                        ereport(ERROR,
                                        (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
                                         errmsg("could not print extension value in certificate at position %d",

diff --git a/src/backend/libpq/be-secure-openssl.c b/src/backend/libpq/be-secure-openssl.c
index b0492c443ecea490e1a6789162ec30a89dd572f7..96e60a97f043c259dcdb06a6fd5396b74ff94538 100644 (file)
--- a/src/backend/libpq/be-secure-openssl.c
+++ b/src/backend/libpq/be-secure-openssl.c
@@ -71,7 +71,7 @@ static bool initialize_dh(SSL_CTX *context, bool isServerStart);
 static bool initialize_ecdh(SSL_CTX *context, bool isServerStart);
 static const char *SSLerrmessage(unsigned long ecode);
 
-static char *X509_NAME_to_cstring(X509_NAME *name);
+static char *X509_NAME_to_cstring(const X509_NAME *name);
 
 static SSL_CTX *SSL_context = NULL;
 static bool SSL_initialized = false;
@@ -587,18 +587,18 @@ aloop:
        if (port->peer != NULL)
        {
                int                     len;
-               X509_NAME  *x509name = X509_get_subject_name(port->peer);
+               const X509_NAME *x509name = X509_get_subject_name(port->peer);
                char       *peer_dn;
                BIO                *bio = NULL;
                BUF_MEM    *bio_buf = NULL;
 
-               len = X509_NAME_get_text_by_NID(x509name, NID_commonName, NULL, 0);
+               len = X509_NAME_get_text_by_NID(unconstify(X509_NAME *, x509name), NID_commonName, NULL, 0);
                if (len != -1)
                {
                        char       *peer_cn;
 
                        peer_cn = MemoryContextAlloc(TopMemoryContext, len + 1);
-                       r = X509_NAME_get_text_by_NID(x509name, NID_commonName, peer_cn,
+                       r = X509_NAME_get_text_by_NID(unconstify(X509_NAME *, x509name), NID_commonName, peer_cn,
                                                                                  len + 1);
                        peer_cn[len] = '\0';
                        if (r != len)
@@ -642,7 +642,7 @@ aloop:
                 * which make regular expression matching a bit easier. Also note that
                 * it prints the Subject fields in reverse order.
                 */
-               if (X509_NAME_print_ex(bio, x509name, 0, XN_FLAG_RFC2253) == -1 ||
+               if (X509_NAME_print_ex(bio, unconstify(X509_NAME *, x509name), 0, XN_FLAG_RFC2253) == -1 ||
                        BIO_get_mem_ptr(bio, &bio_buf) <= 0)
                {
                        BIO_free(bio);
@@ -1422,14 +1422,14 @@ be_tls_get_certificate_hash(Port *port, size_t *len)
  *
  */
 static char *
-X509_NAME_to_cstring(X509_NAME *name)
+X509_NAME_to_cstring(const X509_NAME *name)
 {
        BIO                *membuf = BIO_new(BIO_s_mem());
        int                     i,
                                nid,
-                               count = X509_NAME_entry_count(name);
-       X509_NAME_ENTRY *e;
-       ASN1_STRING *v;
+                               count = X509_NAME_entry_count(unconstify(X509_NAME *, name));
+       const X509_NAME_ENTRY *e;
+       const ASN1_STRING *v;
        const char *field_name;
        size_t          size;
        char            nullterm;
@@ -1445,13 +1445,13 @@ X509_NAME_to_cstring(X509_NAME *name)
        (void) BIO_set_close(membuf, BIO_CLOSE);
        for (i = 0; i < count; i++)
        {
-               e = X509_NAME_get_entry(name, i);
-               nid = OBJ_obj2nid(X509_NAME_ENTRY_get_object(e));
+               e = X509_NAME_get_entry(unconstify(X509_NAME *, name), i);
+               nid = OBJ_obj2nid(X509_NAME_ENTRY_get_object(unconstify(X509_NAME_ENTRY *, e)));
                if (nid == NID_undef)
                        ereport(ERROR,
                                        (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
                                         errmsg("could not get NID for ASN1_OBJECT object")));
-               v = X509_NAME_ENTRY_get_data(e);
+               v = X509_NAME_ENTRY_get_data(unconstify(X509_NAME_ENTRY *, e));
                field_name = OBJ_nid2sn(nid);
                if (field_name == NULL)
                        field_name = OBJ_nid2ln(nid);
@@ -1460,7 +1460,7 @@ X509_NAME_to_cstring(X509_NAME *name)
                                        (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
                                         errmsg("could not convert NID %d to an ASN1_OBJECT structure", nid)));
                BIO_printf(membuf, "/%s=", field_name);
-               ASN1_STRING_print_ex(membuf, v,
+               ASN1_STRING_print_ex(membuf, unconstify(ASN1_STRING *, v),
                                                         ((ASN1_STRFLGS_RFC2253 & ~ASN1_STRFLGS_ESC_MSB)
                                                          | ASN1_STRFLGS_UTF8_CONVERT));
        }

diff --git a/src/interfaces/libpq/fe-secure-openssl.c b/src/interfaces/libpq/fe-secure-openssl.c
index 50d14eac0eeb76d0f7f568cc23fc22525e928912..d22b5279b1259ce407b6acf9297898b073c5d6da 100644 (file)
--- a/src/interfaces/libpq/fe-secure-openssl.c
+++ b/src/interfaces/libpq/fe-secure-openssl.c
@@ -70,7 +70,7 @@
 
 static int     verify_cb(int ok, X509_STORE_CTX *ctx);
 static int     openssl_verify_peer_name_matches_certificate_name(PGconn *conn,
-                                                                                                                         ASN1_STRING *name,
+                                                                                                                         const ASN1_STRING *name,
                                                                                                                          char **store_name);
 static int     openssl_verify_peer_name_matches_certificate_ip(PGconn *conn,
                                                                                                                        ASN1_OCTET_STRING *addr_entry,
@@ -490,7 +490,8 @@ verify_cb(int ok, X509_STORE_CTX *ctx)
  * into a plain C string.
  */
 static int
-openssl_verify_peer_name_matches_certificate_name(PGconn *conn, ASN1_STRING *name_entry,
+openssl_verify_peer_name_matches_certificate_name(PGconn *conn,
+                                                                                                 const ASN1_STRING *name_entry,
                                                                                                  char **store_name)
 {
        int                     len;
@@ -683,14 +684,14 @@ pgtls_verify_peer_name_matches_certificate_guts(PGconn *conn,
         */
        if (check_cn)
        {
-               X509_NAME  *subject_name;
+               const X509_NAME *subject_name;
 
                subject_name = X509_get_subject_name(conn->peer);
                if (subject_name != NULL)
                {
                        int                     cn_index;
 
-                       cn_index = X509_NAME_get_index_by_NID(subject_name,
+                       cn_index = X509_NAME_get_index_by_NID(unconstify(X509_NAME *, subject_name),
                                                                                                  NID_commonName, -1);
                        if (cn_index >= 0)
                        {

diff --git a/src/test/ssl/t/001_ssltests.pl b/src/test/ssl/t/001_ssltests.pl
index c570b48a1bddd19628e739c068bb363e2240ab65..756745b7bec81ce000bf1984011f9c70b072af21 100644 (file)
--- a/src/test/ssl/t/001_ssltests.pl
+++ b/src/test/ssl/t/001_ssltests.pl
@@ -682,7 +682,7 @@ $node->connect_fails(
        "$common_connstr user=ssltestuser sslcert=ssl/client-revoked.crt "
          . sslkey('client-revoked.key'),
        "certificate authorization fails with revoked client cert",
-       expected_stderr => qr|SSL error: ssl[a-z0-9/]* alert certificate revoked|,
+       expected_stderr => qr!SSL error: (ssl[a-z0-9/]*|tls) alert certificate revoked!,
        # revoked certificates should not authenticate the user
        log_unlike => [qr/connection authenticated:/],);
 
@@ -743,6 +743,6 @@ $node->connect_fails(
        "$common_connstr user=ssltestuser sslcert=ssl/client-revoked.crt "
          . sslkey('client-revoked.key'),
        "certificate authorization fails with revoked client cert with server-side CRL directory",
-       expected_stderr => qr|SSL error: ssl[a-z0-9/]* alert certificate revoked|);
+       expected_stderr => qr!SSL error: (ssl[a-z0-9/]*|tls) alert certificate revoked!);
 
 done_testing();