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/*-------------------------------------------------------------------------
*
* fe-secure.c
* functions related to setting up a secure connection to the backend.
* Secure connections are expected to provide confidentiality,
* message integrity and endpoint authentication.
*
*
* Portions Copyright (c) 1996-2014, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
*
* IDENTIFICATION
* src/interfaces/libpq/fe-secure.c
*
* NOTES
*
* We don't provide informational callbacks here (like
* info_cb() in be-secure.c), since there's no good mechanism to
* display such information to the user.
*
*-------------------------------------------------------------------------
*/
#include "postgres_fe.h"
#include <signal.h>
#include <fcntl.h>
#include <ctype.h>
#include "libpq-fe.h"
#include "fe-auth.h"
#include "libpq-int.h"
#ifdef WIN32
#include "win32.h"
#else
#include <sys/socket.h>
#include <unistd.h>
#include <netdb.h>
#include <netinet/in.h>
#ifdef HAVE_NETINET_TCP_H
#include <netinet/tcp.h>
#endif
#include <arpa/inet.h>
#endif
#include <sys/stat.h>
#ifdef ENABLE_THREAD_SAFETY
#ifdef WIN32
#include "pthread-win32.h"
#else
#include <pthread.h>
#endif
#endif
#ifdef USE_SSL
#include <openssl/ssl.h>
#if (SSLEAY_VERSION_NUMBER >= 0x00907000L)
#include <openssl/conf.h>
#endif
#ifdef USE_SSL_ENGINE
#include <openssl/engine.h>
#endif
#ifndef WIN32
#define USER_CERT_FILE ".postgresql/postgresql.crt"
#define USER_KEY_FILE ".postgresql/postgresql.key"
#define ROOT_CERT_FILE ".postgresql/root.crt"
#define ROOT_CRL_FILE ".postgresql/root.crl"
#else
/* On Windows, the "home" directory is already PostgreSQL-specific */
#define USER_CERT_FILE "postgresql.crt"
#define USER_KEY_FILE "postgresql.key"
#define ROOT_CERT_FILE "root.crt"
#define ROOT_CRL_FILE "root.crl"
#endif
static bool verify_peer_name_matches_certificate(PGconn *);
static int verify_cb(int ok, X509_STORE_CTX *ctx);
static int init_ssl_system(PGconn *conn);
static void destroy_ssl_system(void);
static int initialize_SSL(PGconn *conn);
static void destroySSL(void);
static PostgresPollingStatusType open_client_SSL(PGconn *);
static void close_SSL(PGconn *);
static char *SSLerrmessage(void);
static void SSLerrfree(char *buf);
static bool pq_init_ssl_lib = true;
static bool pq_init_crypto_lib = true;
/*
* SSL_context is currently shared between threads and therefore we need to be
* careful to lock around any usage of it when providing thread safety.
* ssl_config_mutex is the mutex that we use to protect it.
*/
static SSL_CTX *SSL_context = NULL;
#ifdef ENABLE_THREAD_SAFETY
static long ssl_open_connections = 0;
#ifndef WIN32
static pthread_mutex_t ssl_config_mutex = PTHREAD_MUTEX_INITIALIZER;
#else
static pthread_mutex_t ssl_config_mutex = NULL;
static long win32_ssl_create_mutex = 0;
#endif
#endif /* ENABLE_THREAD_SAFETY */
#endif /* SSL */
/*
* Macros to handle disabling and then restoring the state of SIGPIPE handling.
* On Windows, these are all no-ops since there's no SIGPIPEs.
*/
#ifndef WIN32
#define SIGPIPE_MASKED(conn) ((conn)->sigpipe_so || (conn)->sigpipe_flag)
#ifdef ENABLE_THREAD_SAFETY
struct sigpipe_info
{
sigset_t oldsigmask;
bool sigpipe_pending;
bool got_epipe;
};
#define DECLARE_SIGPIPE_INFO(spinfo) struct sigpipe_info spinfo
#define DISABLE_SIGPIPE(conn, spinfo, failaction) \
do { \
(spinfo).got_epipe = false; \
if (!SIGPIPE_MASKED(conn)) \
{ \
if (pq_block_sigpipe(&(spinfo).oldsigmask, \
&(spinfo).sigpipe_pending) < 0) \
failaction; \
} \
} while (0)
#define REMEMBER_EPIPE(spinfo, cond) \
do { \
if (cond) \
(spinfo).got_epipe = true; \
} while (0)
#define RESTORE_SIGPIPE(conn, spinfo) \
do { \
if (!SIGPIPE_MASKED(conn)) \
pq_reset_sigpipe(&(spinfo).oldsigmask, (spinfo).sigpipe_pending, \
(spinfo).got_epipe); \
} while (0)
#else /* !ENABLE_THREAD_SAFETY */
#define DECLARE_SIGPIPE_INFO(spinfo) pqsigfunc spinfo = NULL
#define DISABLE_SIGPIPE(conn, spinfo, failaction) \
do { \
if (!SIGPIPE_MASKED(conn)) \
spinfo = pqsignal(SIGPIPE, SIG_IGN); \
} while (0)
#define REMEMBER_EPIPE(spinfo, cond)
#define RESTORE_SIGPIPE(conn, spinfo) \
do { \
if (!SIGPIPE_MASKED(conn)) \
pqsignal(SIGPIPE, spinfo); \
} while (0)
#endif /* ENABLE_THREAD_SAFETY */
#else /* WIN32 */
#define DECLARE_SIGPIPE_INFO(spinfo)
#define DISABLE_SIGPIPE(conn, spinfo, failaction)
#define REMEMBER_EPIPE(spinfo, cond)
#define RESTORE_SIGPIPE(conn, spinfo)
#endif /* WIN32 */
/* ------------------------------------------------------------ */
/* Procedures common to all secure sessions */
/* ------------------------------------------------------------ */
/*
* Exported function to allow application to tell us it's already
* initialized OpenSSL.
*/
void
PQinitSSL(int do_init)
{
PQinitOpenSSL(do_init, do_init);
}
/*
* Exported function to allow application to tell us it's already
* initialized OpenSSL and/or libcrypto.
*/
void
PQinitOpenSSL(int do_ssl, int do_crypto)
{
#ifdef USE_SSL
#ifdef ENABLE_THREAD_SAFETY
/*
* Disallow changing the flags while we have open connections, else we'd
* get completely confused.
*/
if (ssl_open_connections != 0)
return;
#endif
pq_init_ssl_lib = do_ssl;
pq_init_crypto_lib = do_crypto;
#endif
}
/*
* Initialize global SSL context
*/
int
pqsecure_initialize(PGconn *conn)
{
int r = 0;
#ifdef USE_SSL
r = init_ssl_system(conn);
#endif
return r;
}
/*
* Destroy global context
*/
void
pqsecure_destroy(void)
{
#ifdef USE_SSL
destroySSL();
#endif
}
/*
* Begin or continue negotiating a secure session.
*/
PostgresPollingStatusType
pqsecure_open_client(PGconn *conn)
{
#ifdef USE_SSL
/* First time through? */
if (conn->ssl == NULL)
{
#ifdef ENABLE_THREAD_SAFETY
int rc;
#endif
/* We cannot use MSG_NOSIGNAL to block SIGPIPE when using SSL */
conn->sigpipe_flag = false;
#ifdef ENABLE_THREAD_SAFETY
if ((rc = pthread_mutex_lock(&ssl_config_mutex)))
{
printfPQExpBuffer(&conn->errorMessage,
libpq_gettext("could not acquire mutex: %s\n"), strerror(rc));
return PGRES_POLLING_FAILED;
}
#endif
/* Create a connection-specific SSL object */
if (!(conn->ssl = SSL_new(SSL_context)) ||
!SSL_set_app_data(conn->ssl, conn) ||
!SSL_set_fd(conn->ssl, conn->sock))
{
char *err = SSLerrmessage();
printfPQExpBuffer(&conn->errorMessage,
libpq_gettext("could not establish SSL connection: %s\n"),
err);
SSLerrfree(err);
#ifdef ENABLE_THREAD_SAFETY
pthread_mutex_unlock(&ssl_config_mutex);
#endif
close_SSL(conn);
return PGRES_POLLING_FAILED;
}
#ifdef ENABLE_THREAD_SAFETY
pthread_mutex_unlock(&ssl_config_mutex);
#endif
/*
* Load client certificate, private key, and trusted CA certs.
*/
if (initialize_SSL(conn) != 0)
{
/* initialize_SSL already put a message in conn->errorMessage */
close_SSL(conn);
return PGRES_POLLING_FAILED;
}
}
/* Begin or continue the actual handshake */
return open_client_SSL(conn);
#else
/* shouldn't get here */
return PGRES_POLLING_FAILED;
#endif
}
/*
* Close secure session.
*/
void
pqsecure_close(PGconn *conn)
{
#ifdef USE_SSL
if (conn->ssl)
close_SSL(conn);
#endif
}
/*
* Read data from a secure connection.
*
* On failure, this function is responsible for putting a suitable message
* into conn->errorMessage. The caller must still inspect errno, but only
* to determine whether to continue/retry after error.
*/
ssize_t
pqsecure_read(PGconn *conn, void *ptr, size_t len)
{
ssize_t n;
int result_errno = 0;
char sebuf[256];
#ifdef USE_SSL
if (conn->ssl)
{
int err;
DECLARE_SIGPIPE_INFO(spinfo);
/* SSL_read can write to the socket, so we need to disable SIGPIPE */
DISABLE_SIGPIPE(conn, spinfo, return -1);
rloop:
SOCK_ERRNO_SET(0);
n = SSL_read(conn->ssl, ptr, len);
err = SSL_get_error(conn->ssl, n);
switch (err)
{
case SSL_ERROR_NONE:
if (n < 0)
{
/* Not supposed to happen, so we don't translate the msg */
printfPQExpBuffer(&conn->errorMessage,
"SSL_read failed but did not provide error information\n");
/* assume the connection is broken */
result_errno = ECONNRESET;
}
break;
case SSL_ERROR_WANT_READ:
n = 0;
break;
case SSL_ERROR_WANT_WRITE:
/*
* Returning 0 here would cause caller to wait for read-ready,
* which is not correct since what SSL wants is wait for
* write-ready. The former could get us stuck in an infinite
* wait, so don't risk it; busy-loop instead.
*/
goto rloop;
case SSL_ERROR_SYSCALL:
if (n < 0)
{
result_errno = SOCK_ERRNO;
REMEMBER_EPIPE(spinfo, result_errno == EPIPE);
if (result_errno == EPIPE ||
result_errno == ECONNRESET)
printfPQExpBuffer(&conn->errorMessage,
libpq_gettext(
"server closed the connection unexpectedly\n"
"\tThis probably means the server terminated abnormally\n"
"\tbefore or while processing the request.\n"));
else
printfPQExpBuffer(&conn->errorMessage,
libpq_gettext("SSL SYSCALL error: %s\n"),
SOCK_STRERROR(result_errno,
sebuf, sizeof(sebuf)));
}
else
{
printfPQExpBuffer(&conn->errorMessage,
libpq_gettext("SSL SYSCALL error: EOF detected\n"));
/* assume the connection is broken */
result_errno = ECONNRESET;
n = -1;
}
break;
case SSL_ERROR_SSL:
{
char *errm = SSLerrmessage();
printfPQExpBuffer(&conn->errorMessage,
libpq_gettext("SSL error: %s\n"), errm);
SSLerrfree(errm);
/* assume the connection is broken */
result_errno = ECONNRESET;
n = -1;
break;
}
case SSL_ERROR_ZERO_RETURN:
/*
* Per OpenSSL documentation, this error code is only returned
* for a clean connection closure, so we should not report it
* as a server crash.
*/
printfPQExpBuffer(&conn->errorMessage,
libpq_gettext("SSL connection has been closed unexpectedly\n"));
result_errno = ECONNRESET;
n = -1;
break;
default:
printfPQExpBuffer(&conn->errorMessage,
libpq_gettext("unrecognized SSL error code: %d\n"),
err);
/* assume the connection is broken */
result_errno = ECONNRESET;
n = -1;
break;
}
RESTORE_SIGPIPE(conn, spinfo);
}
else
#endif /* USE_SSL */
{
n = recv(conn->sock, ptr, len, 0);
if (n < 0)
{
result_errno = SOCK_ERRNO;
/* Set error message if appropriate */
switch (result_errno)
{
#ifdef EAGAIN
case EAGAIN:
#endif
#if defined(EWOULDBLOCK) && (!defined(EAGAIN) || (EWOULDBLOCK != EAGAIN))
case EWOULDBLOCK:
#endif
case EINTR:
/* no error message, caller is expected to retry */
break;
#ifdef ECONNRESET
case ECONNRESET:
printfPQExpBuffer(&conn->errorMessage,
libpq_gettext(
"server closed the connection unexpectedly\n"
"\tThis probably means the server terminated abnormally\n"
"\tbefore or while processing the request.\n"));
break;
#endif
default:
printfPQExpBuffer(&conn->errorMessage,
libpq_gettext("could not receive data from server: %s\n"),
SOCK_STRERROR(result_errno,
sebuf, sizeof(sebuf)));
break;
}
}
}
/* ensure we return the intended errno to caller */
SOCK_ERRNO_SET(result_errno);
return n;
}
/*
* Write data to a secure connection.
*
* On failure, this function is responsible for putting a suitable message
* into conn->errorMessage. The caller must still inspect errno, but only
* to determine whether to continue/retry after error.
*/
ssize_t
pqsecure_write(PGconn *conn, const void *ptr, size_t len)
{
ssize_t n;
int result_errno = 0;
char sebuf[256];
DECLARE_SIGPIPE_INFO(spinfo);
#ifdef USE_SSL
if (conn->ssl)
{
int err;
DISABLE_SIGPIPE(conn, spinfo, return -1);
SOCK_ERRNO_SET(0);
n = SSL_write(conn->ssl, ptr, len);
err = SSL_get_error(conn->ssl, n);
switch (err)
{
case SSL_ERROR_NONE:
if (n < 0)
{
/* Not supposed to happen, so we don't translate the msg */
printfPQExpBuffer(&conn->errorMessage,
"SSL_write failed but did not provide error information\n");
/* assume the connection is broken */
result_errno = ECONNRESET;
}
break;
case SSL_ERROR_WANT_READ:
/*
* Returning 0 here causes caller to wait for write-ready,
* which is not really the right thing, but it's the best we
* can do.
*/
n = 0;
break;
case SSL_ERROR_WANT_WRITE:
n = 0;
break;
case SSL_ERROR_SYSCALL:
if (n < 0)
{
result_errno = SOCK_ERRNO;
REMEMBER_EPIPE(spinfo, result_errno == EPIPE);
if (result_errno == EPIPE ||
result_errno == ECONNRESET)
printfPQExpBuffer(&conn->errorMessage,
libpq_gettext(
"server closed the connection unexpectedly\n"
"\tThis probably means the server terminated abnormally\n"
"\tbefore or while processing the request.\n"));
else
printfPQExpBuffer(&conn->errorMessage,
libpq_gettext("SSL SYSCALL error: %s\n"),
SOCK_STRERROR(result_errno,
sebuf, sizeof(sebuf)));
}
else
{
printfPQExpBuffer(&conn->errorMessage,
libpq_gettext("SSL SYSCALL error: EOF detected\n"));
/* assume the connection is broken */
result_errno = ECONNRESET;
n = -1;
}
break;
case SSL_ERROR_SSL:
{
char *errm = SSLerrmessage();
printfPQExpBuffer(&conn->errorMessage,
libpq_gettext("SSL error: %s\n"), errm);
SSLerrfree(errm);
/* assume the connection is broken */
result_errno = ECONNRESET;
n = -1;
break;
}
case SSL_ERROR_ZERO_RETURN:
/*
* Per OpenSSL documentation, this error code is only returned
* for a clean connection closure, so we should not report it
* as a server crash.
*/
printfPQExpBuffer(&conn->errorMessage,
libpq_gettext("SSL connection has been closed unexpectedly\n"));
result_errno = ECONNRESET;
n = -1;
break;
default:
printfPQExpBuffer(&conn->errorMessage,
libpq_gettext("unrecognized SSL error code: %d\n"),
err);
/* assume the connection is broken */
result_errno = ECONNRESET;
n = -1;
break;
}
}
else
#endif /* USE_SSL */
{
int flags = 0;
#ifdef MSG_NOSIGNAL
if (conn->sigpipe_flag)
flags |= MSG_NOSIGNAL;
retry_masked:
#endif /* MSG_NOSIGNAL */
DISABLE_SIGPIPE(conn, spinfo, return -1);
n = send(conn->sock, ptr, len, flags);
if (n < 0)
{
result_errno = SOCK_ERRNO;
/*
* If we see an EINVAL, it may be because MSG_NOSIGNAL isn't
* available on this machine. So, clear sigpipe_flag so we don't
* try the flag again, and retry the send().
*/
#ifdef MSG_NOSIGNAL
if (flags != 0 && result_errno == EINVAL)
{
conn->sigpipe_flag = false;
flags = 0;
goto retry_masked;
}
#endif /* MSG_NOSIGNAL */
/* Set error message if appropriate */
switch (result_errno)
{
#ifdef EAGAIN
case EAGAIN:
#endif
#if defined(EWOULDBLOCK) && (!defined(EAGAIN) || (EWOULDBLOCK != EAGAIN))
case EWOULDBLOCK:
#endif
case EINTR:
/* no error message, caller is expected to retry */
break;
case EPIPE:
/* Set flag for EPIPE */
REMEMBER_EPIPE(spinfo, true);
/* FALL THRU */
#ifdef ECONNRESET
case ECONNRESET:
#endif
printfPQExpBuffer(&conn->errorMessage,
libpq_gettext(
"server closed the connection unexpectedly\n"
"\tThis probably means the server terminated abnormally\n"
"\tbefore or while processing the request.\n"));
break;
default:
printfPQExpBuffer(&conn->errorMessage,
libpq_gettext("could not send data to server: %s\n"),
SOCK_STRERROR(result_errno,
sebuf, sizeof(sebuf)));
break;
}
}
}
RESTORE_SIGPIPE(conn, spinfo);
/* ensure we return the intended errno to caller */
SOCK_ERRNO_SET(result_errno);
return n;
}
/* ------------------------------------------------------------ */
/* SSL specific code */
/* ------------------------------------------------------------ */
#ifdef USE_SSL
/*
* Certificate verification callback
*
* This callback allows us to log intermediate problems during
* verification, but there doesn't seem to be a clean way to get
* our PGconn * structure. So we can't log anything!
*
* This callback also allows us to override the default acceptance
* criteria (e.g., accepting self-signed or expired certs), but
* for now we accept the default checks.
*/
static int
verify_cb(int ok, X509_STORE_CTX *ctx)
{
return ok;
}
/*
* Check if a wildcard certificate matches the server hostname.
*
* The rule for this is:
* 1. We only match the '*' character as wildcard
* 2. We match only wildcards at the start of the string
* 3. The '*' character does *not* match '.', meaning that we match only
* a single pathname component.
* 4. We don't support more than one '*' in a single pattern.
*
* This is roughly in line with RFC2818, but contrary to what most browsers
* appear to be implementing (point 3 being the difference)
*
* Matching is always case-insensitive, since DNS is case insensitive.
*/
static int
wildcard_certificate_match(const char *pattern, const char *string)
{
int lenpat = strlen(pattern);
int lenstr = strlen(string);
/* If we don't start with a wildcard, it's not a match (rule 1 & 2) */
if (lenpat < 3 ||
pattern[0] != '*' ||
pattern[1] != '.')
return 0;
if (lenpat > lenstr)
/* If pattern is longer than the string, we can never match */
return 0;
if (pg_strcasecmp(pattern + 1, string + lenstr - lenpat + 1) != 0)
/*
* If string does not end in pattern (minus the wildcard), we don't
* match
*/
return 0;
if (strchr(string, '.') < string + lenstr - lenpat)
/*
* If there is a dot left of where the pattern started to match, we
* don't match (rule 3)
*/
return 0;
/* String ended with pattern, and didn't have a dot before, so we match */
return 1;
}
/*
* Verify that common name resolves to peer.
*/
static bool
verify_peer_name_matches_certificate(PGconn *conn)
{
char *peer_cn;
int r;
int len;
bool result;
/*
* If told not to verify the peer name, don't do it. Return true
* indicating that the verification was successful.
*/
if (strcmp(conn->sslmode, "verify-full") != 0)
return true;
/*
* Extract the common name from the certificate.
*
* XXX: Should support alternate names here
*/
/* First find out the name's length and allocate a buffer for it. */
len = X509_NAME_get_text_by_NID(X509_get_subject_name(conn->peer),
NID_commonName, NULL, 0);
if (len == -1)
{
printfPQExpBuffer(&conn->errorMessage,
libpq_gettext("could not get server common name from server certificate\n"));
return false;
}
peer_cn = malloc(len + 1);
if (peer_cn == NULL)
{
printfPQExpBuffer(&conn->errorMessage,
libpq_gettext("out of memory\n"));
return false;
}
r = X509_NAME_get_text_by_NID(X509_get_subject_name(conn->peer),
NID_commonName, peer_cn, len + 1);
if (r != len)
{
/* Got different length than on the first call. Shouldn't happen. */
printfPQExpBuffer(&conn->errorMessage,
libpq_gettext("could not get server common name from server certificate\n"));
free(peer_cn);
return false;
}
peer_cn[len] = '\0';
/*
* Reject embedded NULLs in certificate common name to prevent attacks
* like CVE-2009-4034.
*/
if (len != strlen(peer_cn))
{
printfPQExpBuffer(&conn->errorMessage,
libpq_gettext("SSL certificate's common name contains embedded null\n"));
free(peer_cn);
return false;
}
/*
* We got the peer's common name. Now compare it against the originally
* given hostname.
*/
if (!(conn->pghost && conn->pghost[0] != '\0'))
{
printfPQExpBuffer(&conn->errorMessage,
libpq_gettext("host name must be specified for a verified SSL connection\n"));
result = false;
}
else
{
if (pg_strcasecmp(peer_cn, conn->pghost) == 0)
/* Exact name match */
result = true;
else if (wildcard_certificate_match(peer_cn, conn->pghost))
/* Matched wildcard certificate */
result = true;
else
{
printfPQExpBuffer(&conn->errorMessage,
libpq_gettext("server common name \"%s\" does not match host name \"%s\"\n"),
peer_cn, conn->pghost);
result = false;
}
}
free(peer_cn);
return result;
}
#ifdef ENABLE_THREAD_SAFETY
/*
* Callback functions for OpenSSL internal locking
*/
static unsigned long
pq_threadidcallback(void)
{
/*
* This is not standards-compliant. pthread_self() returns pthread_t, and
* shouldn't be cast to unsigned long, but CRYPTO_set_id_callback requires
* it, so we have to do it.
*/
return (unsigned long) pthread_self();
}
static pthread_mutex_t *pq_lockarray;
static void
pq_lockingcallback(int mode, int n, const char *file, int line)
{
if (mode & CRYPTO_LOCK)
{
if (pthread_mutex_lock(&pq_lockarray[n]))
PGTHREAD_ERROR("failed to lock mutex");
}
else
{
if (pthread_mutex_unlock(&pq_lockarray[n]))
PGTHREAD_ERROR("failed to unlock mutex");
}
}
#endif /* ENABLE_THREAD_SAFETY */
/*
* Initialize SSL system, in particular creating the SSL_context object
* that will be shared by all SSL-using connections in this process.
*
* In threadsafe mode, this includes setting up libcrypto callback functions
* to do thread locking.
*
* If the caller has told us (through PQinitOpenSSL) that he's taking care
* of libcrypto, we expect that callbacks are already set, and won't try to
* override it.
*
* The conn parameter is only used to be able to pass back an error
* message - no connection-local setup is made here.
*
* Returns 0 if OK, -1 on failure (with a message in conn->errorMessage).
*/
static int
init_ssl_system(PGconn *conn)
{
#ifdef ENABLE_THREAD_SAFETY
#ifdef WIN32
/* Also see similar code in fe-connect.c, default_threadlock() */
if (ssl_config_mutex == NULL)
{
while (InterlockedExchange(&win32_ssl_create_mutex, 1) == 1)
/* loop, another thread own the lock */ ;
if (ssl_config_mutex == NULL)
{
if (pthread_mutex_init(&ssl_config_mutex, NULL))
return -1;
}
InterlockedExchange(&win32_ssl_create_mutex, 0);
}
#endif
if (pthread_mutex_lock(&ssl_config_mutex))
return -1;
if (pq_init_crypto_lib)
{
/*
* If necessary, set up an array to hold locks for libcrypto.
* libcrypto will tell us how big to make this array.
*/
if (pq_lockarray == NULL)
{
int i;
pq_lockarray = malloc(sizeof(pthread_mutex_t) * CRYPTO_num_locks());
if (!pq_lockarray)
{
pthread_mutex_unlock(&ssl_config_mutex);
return -1;
}
for (i = 0; i < CRYPTO_num_locks(); i++)
{
if (pthread_mutex_init(&pq_lockarray[i], NULL))
{
free(pq_lockarray);
pq_lockarray = NULL;
pthread_mutex_unlock(&ssl_config_mutex);
return -1;
}
}
}
if (ssl_open_connections++ == 0)
{
/* These are only required for threaded libcrypto applications */
CRYPTO_THREADID_set_callback(pq_threadidcallback);
CRYPTO_set_locking_callback(pq_lockingcallback);
}
}
#endif /* ENABLE_THREAD_SAFETY */
if (!SSL_context)
{
if (pq_init_ssl_lib)
{
#if SSLEAY_VERSION_NUMBER >= 0x00907000L
OPENSSL_config(NULL);
#endif
SSL_library_init();
SSL_load_error_strings();
}
/*
* We use SSLv23_method() because it can negotiate use of the highest
* mutually supported protocol version, while alternatives like
* TLSv1_2_method() permit only one specific version. Note that we
* don't actually allow SSL v2 or v3, only TLS protocols (see below).
*/
SSL_context = SSL_CTX_new(SSLv23_method());
if (!SSL_context)
{
char *err = SSLerrmessage();
printfPQExpBuffer(&conn->errorMessage,
libpq_gettext("could not create SSL context: %s\n"),
err);
SSLerrfree(err);
#ifdef ENABLE_THREAD_SAFETY
pthread_mutex_unlock(&ssl_config_mutex);
#endif
return -1;
}
/* Disable old protocol versions */
SSL_CTX_set_options(SSL_context, SSL_OP_NO_SSLv2 | SSL_OP_NO_SSLv3);
/*
* Disable OpenSSL's moving-write-buffer sanity check, because it
* causes unnecessary failures in nonblocking send cases.
*/
SSL_CTX_set_mode(SSL_context, SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER);
}