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Improve error reporting for SSL connection failures. Remove redundant

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free operations in client_cert_cb --- openssl will also attempt to free
these structures, resulting in core dumps.
This commit is contained in:
Tom Lane 2004-11-20 00:18:18 +00:00
parent 88969ea11a
commit 7506677b62
2 changed files with 69 additions and 50 deletions
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85
src/backend/libpq/be-secure.c
View File

@ -11,7 +11,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/libpq/be-secure.c,v 1.53 2004/11/17 04:05:42 neilc Exp $
* $PostgreSQL: pgsql/src/backend/libpq/be-secure.c,v 1.54 2004/11/20 00:18:13 tgl Exp $
*
* Since the server static private key ($DataDir/server.key)
* will normally be stored unencrypted so that the database
@ -727,37 +727,6 @@ initialize_SSL(void)
return 0;
}
#ifdef WIN32
/*
* Win32 socket code uses nonblocking sockets. We ned to deal with that
* by waiting on the socket if the SSL accept operation didn't complete
* right away.
*/
static int pgwin32_SSL_accept(SSL *ssl)
{
int r;
while (1)
{
int rc;
int waitfor;
r = SSL_accept(ssl);
if (r == 1)
return 1;
rc = SSL_get_error(ssl, r);
if (rc != SSL_ERROR_WANT_READ && rc != SSL_ERROR_WANT_WRITE)
return r;
waitfor = (rc == SSL_ERROR_WANT_READ)?FD_READ|FD_CLOSE|FD_ACCEPT:FD_WRITE|FD_CLOSE;
if (pgwin32_waitforsinglesocket(SSL_get_fd(ssl), waitfor) == 0)
return -1;
}
}
#define SSL_accept(ssl) pgwin32_SSL_accept(ssl)
#endif
/*
* Destroy global SSL context.
*/
@ -777,7 +746,9 @@ destroy_SSL(void)
static int
open_server_SSL(Port *port)
{
int r;
int r;
int err;
Assert(!port->ssl);
Assert(!port->peer);
@ -799,12 +770,50 @@ open_server_SSL(Port *port)
close_SSL(port);
return -1;
}
if ((r=SSL_accept(port->ssl)) <= 0)
aloop:
r = SSL_accept(port->ssl);
if (r <= 0)
{
ereport(COMMERROR,
(errcode(ERRCODE_PROTOCOL_VIOLATION),
errmsg("could not accept SSL connection: %i",
SSL_get_error(port->ssl,r))));
err = SSL_get_error(port->ssl, r);
switch (err)
{
case SSL_ERROR_WANT_READ:
case SSL_ERROR_WANT_WRITE:
#ifdef WIN32
pgwin32_waitforsinglesocket(SSL_get_fd(port->ssl),
(err==SSL_ERROR_WANT_READ) ?
FD_READ|FD_CLOSE|FD_ACCEPT : FD_WRITE|FD_CLOSE);
#endif
goto aloop;
case SSL_ERROR_SYSCALL:
if (r < 0)
ereport(COMMERROR,
(errcode_for_socket_access(),
errmsg("could not accept SSL connection: %m")));
else
ereport(COMMERROR,
(errcode(ERRCODE_PROTOCOL_VIOLATION),
errmsg("could not accept SSL connection: EOF detected")));
break;
case SSL_ERROR_SSL:
ereport(COMMERROR,
(errcode(ERRCODE_PROTOCOL_VIOLATION),
errmsg("could not accept SSL connection: %s",
SSLerrmessage())));
break;
case SSL_ERROR_ZERO_RETURN:
ereport(COMMERROR,
(errcode(ERRCODE_PROTOCOL_VIOLATION),
errmsg("could not accept SSL connection: EOF detected")));
break;
default:
ereport(COMMERROR,
(errcode(ERRCODE_PROTOCOL_VIOLATION),
errmsg("unrecognized SSL error code: %d",
err)));
break;
}
close_SSL(port);
return -1;
}

34
src/interfaces/libpq/fe-secure.c
View File

@ -11,7 +11,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/interfaces/libpq/fe-secure.c,v 1.55 2004/10/16 03:26:43 momjian Exp $
* $PostgreSQL: pgsql/src/interfaces/libpq/fe-secure.c,v 1.56 2004/11/20 00:18:18 tgl Exp $
*
* NOTES
* [ Most of these notes are wrong/obsolete, but perhaps not all ]
@ -267,6 +267,11 @@ pqsecure_open_client(PGconn *conn)
close_SSL(conn);
return PGRES_POLLING_FAILED;
}
/*
* Initialize errorMessage to empty. This allows open_client_SSL()
* to detect whether client_cert_cb() has stored a message.
*/
resetPQExpBuffer(&conn->errorMessage);
}
/* Begin or continue the actual handshake */
return open_client_SSL(conn);
@ -797,7 +802,6 @@ client_cert_cb(SSL *ssl, X509 **x509, EVP_PKEY **pkey)
printfPQExpBuffer(&conn->errorMessage,
libpq_gettext("certificate present, but not private key file \"%s\"\n"),
fnbuf);
X509_free(*x509);
return 0;
}
if (!S_ISREG(buf.st_mode) || (buf.st_mode & 0077) ||
@ -806,7 +810,6 @@ client_cert_cb(SSL *ssl, X509 **x509, EVP_PKEY **pkey)
printfPQExpBuffer(&conn->errorMessage,
libpq_gettext("private key file \"%s\" has wrong permissions\n"),
fnbuf);
X509_free(*x509);
return 0;
}
if ((fp = fopen(fnbuf, "r")) == NULL)
@ -814,7 +817,6 @@ client_cert_cb(SSL *ssl, X509 **x509, EVP_PKEY **pkey)
printfPQExpBuffer(&conn->errorMessage,
libpq_gettext("could not open private key file \"%s\": %s\n"),
fnbuf, pqStrerror(errno, sebuf, sizeof(sebuf)));
X509_free(*x509);
return 0;
}
if (fstat(fileno(fp), &buf2) == -1 ||
@ -822,7 +824,6 @@ client_cert_cb(SSL *ssl, X509 **x509, EVP_PKEY **pkey)
{
printfPQExpBuffer(&conn->errorMessage,
libpq_gettext("private key file \"%s\" changed during execution\n"), fnbuf);
X509_free(*x509);
return 0;
}
if (PEM_read_PrivateKey(fp, pkey, cb, NULL) == NULL)
@ -833,7 +834,6 @@ client_cert_cb(SSL *ssl, X509 **x509, EVP_PKEY **pkey)
libpq_gettext("could not read private key file \"%s\": %s\n"),
fnbuf, err);
SSLerrfree(err);
X509_free(*x509);
fclose(fp);
return 0;
}
@ -848,8 +848,6 @@ client_cert_cb(SSL *ssl, X509 **x509, EVP_PKEY **pkey)
libpq_gettext("certificate does not match private key file \"%s\": %s\n"),
fnbuf, err);
SSLerrfree(err);
X509_free(*x509);
EVP_PKEY_free(*pkey);
return 0;
}
@ -1045,11 +1043,23 @@ open_client_SSL(PGconn *conn)
}
case SSL_ERROR_SSL:
{
char *err = SSLerrmessage();
/*
* If there are problems with the local certificate files,
* these will be detected by client_cert_cb() which is
* called from SSL_connect(). We want to return that
* error message and not the rather unhelpful error that
* OpenSSL itself returns. So check to see if an error
* message was already stored.
*/
if (conn->errorMessage.len == 0)
{
char *err = SSLerrmessage();
printfPQExpBuffer(&conn->errorMessage,
libpq_gettext("SSL error: %s\n"), err);
SSLerrfree(err);
printfPQExpBuffer(&conn->errorMessage,
libpq_gettext("SSL error: %s\n"),
err);
SSLerrfree(err);
}
close_SSL(conn);
return PGRES_POLLING_FAILED;
}