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SSL: disabled renegotiation detection in client mode. CVE-2009-3555 is no longer relevant and mitigated by the renegotiation info extension (secure renegotiation). On the other hand, unexpected renegotiation still introduces potential security risks, and hence we do not allow renegotiation on the server side, as we never request renegotiation. On the client side the situation is different though. There are backends which explicitly request renegotiation, and disabled renegotiation introduces interoperability problems. This change allows renegotiation on the client side, and fixes interoperability problems as observed with such backends (ticket #872). Additionally, with TLSv1.3 the SSL_CB_HANDSHAKE_START flag is currently set by OpenSSL when receiving a NewSessionTicket message, and was detected by nginx as a renegotiation attempt. This looks like a bug in OpenSSL, though this change also allows better interoperability till the problem is fixed.
author Sergey Kandaurov <pluknet@nginx.com>
date Tue, 18 Apr 2017 16:08:44 +0300
parents 2cd019520210
children 09d15a2dbc6b
line wrap: on
line source


/*
 * Copyright (C) Igor Sysoev
 * Copyright (C) Nginx, Inc.
 */


#ifndef _NGX_ATOMIC_H_INCLUDED_
#define _NGX_ATOMIC_H_INCLUDED_


#include <ngx_config.h>
#include <ngx_core.h>


#if (NGX_HAVE_LIBATOMIC)

#define AO_REQUIRE_CAS
#include <atomic_ops.h>

#define NGX_HAVE_ATOMIC_OPS  1

typedef long                        ngx_atomic_int_t;
typedef AO_t                        ngx_atomic_uint_t;
typedef volatile ngx_atomic_uint_t  ngx_atomic_t;

#if (NGX_PTR_SIZE == 8)
#define NGX_ATOMIC_T_LEN            (sizeof("-9223372036854775808") - 1)
#else
#define NGX_ATOMIC_T_LEN            (sizeof("-2147483648") - 1)
#endif

#define ngx_atomic_cmp_set(lock, old, new)                                    \
    AO_compare_and_swap(lock, old, new)
#define ngx_atomic_fetch_add(value, add)                                      \
    AO_fetch_and_add(value, add)
#define ngx_memory_barrier()        AO_nop()
#define ngx_cpu_pause()


#elif (NGX_DARWIN_ATOMIC)

/*
 * use Darwin 8 atomic(3) and barrier(3) operations
 * optimized at run-time for UP and SMP
 */

#include <libkern/OSAtomic.h>

/* "bool" conflicts with perl's CORE/handy.h */
#if 0
#undef bool
#endif


#define NGX_HAVE_ATOMIC_OPS  1

#if (NGX_PTR_SIZE == 8)

typedef int64_t                     ngx_atomic_int_t;
typedef uint64_t                    ngx_atomic_uint_t;
#define NGX_ATOMIC_T_LEN            (sizeof("-9223372036854775808") - 1)

#define ngx_atomic_cmp_set(lock, old, new)                                    \
    OSAtomicCompareAndSwap64Barrier(old, new, (int64_t *) lock)

#define ngx_atomic_fetch_add(value, add)                                      \
    (OSAtomicAdd64(add, (int64_t *) value) - add)

#else

typedef int32_t                     ngx_atomic_int_t;
typedef uint32_t                    ngx_atomic_uint_t;
#define NGX_ATOMIC_T_LEN            (sizeof("-2147483648") - 1)

#define ngx_atomic_cmp_set(lock, old, new)                                    \
    OSAtomicCompareAndSwap32Barrier(old, new, (int32_t *) lock)

#define ngx_atomic_fetch_add(value, add)                                      \
    (OSAtomicAdd32(add, (int32_t *) value) - add)

#endif

#define ngx_memory_barrier()        OSMemoryBarrier()

#define ngx_cpu_pause()

typedef volatile ngx_atomic_uint_t  ngx_atomic_t;


#elif (NGX_HAVE_GCC_ATOMIC)

/* GCC 4.1 builtin atomic operations */

#define NGX_HAVE_ATOMIC_OPS  1

typedef long                        ngx_atomic_int_t;
typedef unsigned long               ngx_atomic_uint_t;

#if (NGX_PTR_SIZE == 8)
#define NGX_ATOMIC_T_LEN            (sizeof("-9223372036854775808") - 1)
#else
#define NGX_ATOMIC_T_LEN            (sizeof("-2147483648") - 1)
#endif

typedef volatile ngx_atomic_uint_t  ngx_atomic_t;


#define ngx_atomic_cmp_set(lock, old, set)                                    \
    __sync_bool_compare_and_swap(lock, old, set)

#define ngx_atomic_fetch_add(value, add)                                      \
    __sync_fetch_and_add(value, add)

#define ngx_memory_barrier()        __sync_synchronize()

#if ( __i386__ || __i386 || __amd64__ || __amd64 )
#define ngx_cpu_pause()             __asm__ ("pause")
#else
#define ngx_cpu_pause()
#endif


#elif ( __i386__ || __i386 )

typedef int32_t                     ngx_atomic_int_t;
typedef uint32_t                    ngx_atomic_uint_t;
typedef volatile ngx_atomic_uint_t  ngx_atomic_t;
#define NGX_ATOMIC_T_LEN            (sizeof("-2147483648") - 1)


#if ( __SUNPRO_C )

#define NGX_HAVE_ATOMIC_OPS  1

ngx_atomic_uint_t
ngx_atomic_cmp_set(ngx_atomic_t *lock, ngx_atomic_uint_t old,
    ngx_atomic_uint_t set);

ngx_atomic_int_t
ngx_atomic_fetch_add(ngx_atomic_t *value, ngx_atomic_int_t add);

/*
 * Sun Studio 12 exits with segmentation fault on '__asm ("pause")',
 * so ngx_cpu_pause is declared in src/os/unix/ngx_sunpro_x86.il
 */

void
ngx_cpu_pause(void);

/* the code in src/os/unix/ngx_sunpro_x86.il */

#define ngx_memory_barrier()        __asm (".volatile"); __asm (".nonvolatile")


#else /* ( __GNUC__ || __INTEL_COMPILER ) */

#define NGX_HAVE_ATOMIC_OPS  1

#include "ngx_gcc_atomic_x86.h"

#endif


#elif ( __amd64__ || __amd64 )

typedef int64_t                     ngx_atomic_int_t;
typedef uint64_t                    ngx_atomic_uint_t;
typedef volatile ngx_atomic_uint_t  ngx_atomic_t;
#define NGX_ATOMIC_T_LEN            (sizeof("-9223372036854775808") - 1)


#if ( __SUNPRO_C )

#define NGX_HAVE_ATOMIC_OPS  1

ngx_atomic_uint_t
ngx_atomic_cmp_set(ngx_atomic_t *lock, ngx_atomic_uint_t old,
    ngx_atomic_uint_t set);

ngx_atomic_int_t
ngx_atomic_fetch_add(ngx_atomic_t *value, ngx_atomic_int_t add);

/*
 * Sun Studio 12 exits with segmentation fault on '__asm ("pause")',
 * so ngx_cpu_pause is declared in src/os/unix/ngx_sunpro_amd64.il
 */

void
ngx_cpu_pause(void);

/* the code in src/os/unix/ngx_sunpro_amd64.il */

#define ngx_memory_barrier()        __asm (".volatile"); __asm (".nonvolatile")


#else /* ( __GNUC__ || __INTEL_COMPILER ) */

#define NGX_HAVE_ATOMIC_OPS  1

#include "ngx_gcc_atomic_amd64.h"

#endif


#elif ( __sparc__ || __sparc || __sparcv9 )

#if (NGX_PTR_SIZE == 8)

typedef int64_t                     ngx_atomic_int_t;
typedef uint64_t                    ngx_atomic_uint_t;
#define NGX_ATOMIC_T_LEN            (sizeof("-9223372036854775808") - 1)

#else

typedef int32_t                     ngx_atomic_int_t;
typedef uint32_t                    ngx_atomic_uint_t;
#define NGX_ATOMIC_T_LEN            (sizeof("-2147483648") - 1)

#endif

typedef volatile ngx_atomic_uint_t  ngx_atomic_t;


#if ( __SUNPRO_C )

#define NGX_HAVE_ATOMIC_OPS  1

#include "ngx_sunpro_atomic_sparc64.h"


#else /* ( __GNUC__ || __INTEL_COMPILER ) */

#define NGX_HAVE_ATOMIC_OPS  1

#include "ngx_gcc_atomic_sparc64.h"

#endif


#elif ( __powerpc__ || __POWERPC__ )

#define NGX_HAVE_ATOMIC_OPS  1

#if (NGX_PTR_SIZE == 8)

typedef int64_t                     ngx_atomic_int_t;
typedef uint64_t                    ngx_atomic_uint_t;
#define NGX_ATOMIC_T_LEN            (sizeof("-9223372036854775808") - 1)

#else

typedef int32_t                     ngx_atomic_int_t;
typedef uint32_t                    ngx_atomic_uint_t;
#define NGX_ATOMIC_T_LEN            (sizeof("-2147483648") - 1)

#endif

typedef volatile ngx_atomic_uint_t  ngx_atomic_t;


#include "ngx_gcc_atomic_ppc.h"

#endif


#if !(NGX_HAVE_ATOMIC_OPS)

#define NGX_HAVE_ATOMIC_OPS  0

typedef int32_t                     ngx_atomic_int_t;
typedef uint32_t                    ngx_atomic_uint_t;
typedef volatile ngx_atomic_uint_t  ngx_atomic_t;
#define NGX_ATOMIC_T_LEN            (sizeof("-2147483648") - 1)


static ngx_inline ngx_atomic_uint_t
ngx_atomic_cmp_set(ngx_atomic_t *lock, ngx_atomic_uint_t old,
    ngx_atomic_uint_t set)
{
    if (*lock == old) {
        *lock = set;
        return 1;
    }

    return 0;
}


static ngx_inline ngx_atomic_int_t
ngx_atomic_fetch_add(ngx_atomic_t *value, ngx_atomic_int_t add)
{
    ngx_atomic_int_t  old;

    old = *value;
    *value += add;

    return old;
}

#define ngx_memory_barrier()
#define ngx_cpu_pause()

#endif


void ngx_spinlock(ngx_atomic_t *lock, ngx_atomic_int_t value, ngx_uint_t spin);

#define ngx_trylock(lock)  (*(lock) == 0 && ngx_atomic_cmp_set(lock, 0, 1))
#define ngx_unlock(lock)    *(lock) = 0


#endif /* _NGX_ATOMIC_H_INCLUDED_ */