/*
- * Copyright 1995-2017 The OpenSSL Project Authors. All Rights Reserved.
+ * Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the OpenSSL license (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
#include <openssl/engine.h>
#include "internal/thread_once.h"
#include "rand_lcl.h"
+#ifdef OPENSSL_SYS_UNIX
+# include <sys/types.h>
+# include <unistd.h>
+# include <sys/time.h>
+#endif
+#include "e_os.h"
+
+/* Macro to convert two thirty two bit values into a sixty four bit one */
+#define TWO32TO64(a, b) ((((uint64_t)(a)) << 32) + (b))
+
+/*
+ * Check for the existence and support of POSIX timers. The standard
+ * says that the _POSIX_TIMERS macro will have a positive value if they
+ * are available.
+ *
+ * However, we want an additional constraint: that the timer support does
+ * not require an extra library dependency. Early versions of glibc
+ * require -lrt to be specified on the link line to access the timers,
+ * so this needs to be checked for.
+ *
+ * It is worse because some libraries define __GLIBC__ but don't
+ * support the version testing macro (e.g. uClibc). This means
+ * an extra check is needed.
+ *
+ * The final condition is:
+ * "have posix timers and either not glibc or glibc without -lrt"
+ *
+ * The nested #if sequences are required to avoid using a parameterised
+ * macro that might be undefined.
+ */
+#undef OSSL_POSIX_TIMER_OKAY
+#if defined(_POSIX_TIMERS) && _POSIX_TIMERS > 0
+# if defined(__GLIBC__)
+# if defined(__GLIBC_PREREQ)
+# if __GLIBC_PREREQ(2, 17)
+# define OSSL_POSIX_TIMER_OKAY
+# endif
+# endif
+# else
+# define OSSL_POSIX_TIMER_OKAY
+# endif
+#endif
#ifndef OPENSSL_NO_ENGINE
/* non-NULL if default_RAND_meth is ENGINE-provided */
/*
* Get random from parent, include our state as additional input.
* Our lock is already held, but we need to lock our parent before
- * generating bits from it.
+ * generating bits from it. (Note: taking the lock will be a no-op
+ * if locking if drbg->parent->lock == NULL.)
*/
- if (drbg->parent->lock)
- CRYPTO_THREAD_write_lock(drbg->parent->lock);
+ RAND_DRBG_lock(drbg->parent);
if (RAND_DRBG_generate(drbg->parent,
buffer, bytes_needed,
0,
(unsigned char *)drbg, sizeof(*drbg)) != 0)
bytes = bytes_needed;
- if (drbg->parent->lock)
- CRYPTO_THREAD_unlock(drbg->parent->lock);
+ RAND_DRBG_unlock(drbg->parent);
entropy_available = RAND_POOL_add_end(pool, bytes, 8 * bytes);
}
return ret;
}
+/*
+ * Find a suitable system time. Start with the highest resolution source
+ * and work down to the slower ones. This is added as additional data and
+ * isn't counted as randomness, so any result is acceptable.
+ */
+static uint64_t get_timer_bits(void)
+{
+ uint64_t res = OPENSSL_rdtsc();
+
+ if (res != 0)
+ return res;
+#if defined(_WIN32)
+ {
+ LARGE_INTEGER t;
+ FILETIME ft;
+
+ if (QueryPerformanceCounter(&t) != 0)
+ return t.QuadPart;
+ GetSystemTimeAsFileTime(&ft);
+ return TWO32TO64(ft.dwHighDateTime, ft.dwLowDateTime);
+ }
+#elif defined(__sun) || defined(__hpux)
+ return gethrtime();
+#elif defined(_AIX)
+ {
+ timebasestruct_t t;
+
+ read_wall_time(&t, TIMEBASE_SZ);
+ return TWO32TO64(t.tb_high, t.tb_low);
+ }
+#else
+
+#if defined(OSSL_POSIX_TIMER_OKAY)
+ {
+ struct timespec ts;
+ clockid_t cid;
+
+# ifdef CLOCK_BOOTTIME
+ cid = CLOCK_BOOTTIME;
+# elif defined(_POSIX_MONOTONIC_CLOCK)
+ cid = CLOCK_MONOTONIC;
+# else
+ cid = CLOCK_REALTIME;
+# endif
+
+ if (clock_gettime(cid, &ts) == 0)
+ return TWO32TO64(ts.tv_sec, ts.tv_nsec);
+ }
+# endif
+# if defined(__unix__) \
+ || (defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE >= 200112L)
+ {
+ struct timeval tv;
+
+ if (gettimeofday(&tv, NULL) == 0)
+ return TWO32TO64(tv.tv_sec, tv.tv_usec);
+ }
+# endif
+ return time(NULL);
+#endif
+}
+
+/*
+ * Generate additional data that can be used for the drbg. The data does
+ * not need to contain entropy, but it's useful if it contains at least
+ * some bits that are unpredictable.
+ *
+ * Returns 0 on failure.
+ *
+ * On success it allocates a buffer at |*pout| and returns the length of
+ * the data. The buffer should get freed using OPENSSL_secure_clear_free().
+ */
+size_t rand_drbg_get_additional_data(unsigned char **pout, size_t max_len)
+{
+ RAND_POOL *pool;
+ CRYPTO_THREAD_ID thread_id;
+ size_t len;
+#ifdef OPENSSL_SYS_UNIX
+ pid_t pid;
+#elif defined(OPENSSL_SYS_WIN32)
+ DWORD pid;
+#endif
+ uint64_t tbits;
+
+ pool = RAND_POOL_new(0, 0, max_len);
+ if (pool == NULL)
+ return 0;
+
+#ifdef OPENSSL_SYS_UNIX
+ pid = getpid();
+ RAND_POOL_add(pool, (unsigned char *)&pid, sizeof(pid), 0);
+#elif defined(OPENSSL_SYS_WIN32)
+ pid = GetCurrentProcessId();
+ RAND_POOL_add(pool, (unsigned char *)&pid, sizeof(pid), 0);
+#endif
+
+ thread_id = CRYPTO_THREAD_get_current_id();
+ if (thread_id != 0)
+ RAND_POOL_add(pool, (unsigned char *)&thread_id, sizeof(thread_id), 0);
+
+ tbits = get_timer_bits();
+ RAND_POOL_add(pool, (unsigned char *)&tbits, sizeof(tbits), 0);
+
+ /* TODO: Use RDSEED? */
+
+ len = RAND_POOL_length(pool);
+ if (len != 0)
+ *pout = RAND_POOL_detach(pool);
+ RAND_POOL_free(pool);
+
+ return len;
+}
/*
* Implements the cleanup_entropy() callback (see RAND_DRBG_set_callbacks())
int ret = 1;
#ifndef OPENSSL_NO_ENGINE
- rand_engine_lock = CRYPTO_THREAD_glock_new("rand_engine");
+ rand_engine_lock = CRYPTO_THREAD_lock_new();
ret &= rand_engine_lock != NULL;
#endif
- rand_meth_lock = CRYPTO_THREAD_glock_new("rand_meth");
+ rand_meth_lock = CRYPTO_THREAD_lock_new();
ret &= rand_meth_lock != NULL;
return ret;
if (drbg == NULL)
return 0;
- CRYPTO_THREAD_write_lock(drbg->lock);
+ RAND_DRBG_lock(drbg);
ret = rand_drbg_restart(drbg, NULL, 0, 0);
- CRYPTO_THREAD_unlock(drbg->lock);
+ RAND_DRBG_unlock(drbg);
return ret;
return 0;
/* We have to lock the DRBG before generating bits from it. */
- CRYPTO_THREAD_write_lock(drbg->lock);
- ret = RAND_DRBG_generate(drbg, buf, num, 0, NULL, 0);
- CRYPTO_THREAD_unlock(drbg->lock);
+ RAND_DRBG_lock(drbg);
+ ret = RAND_DRBG_bytes(drbg, buf, num);
+ RAND_DRBG_unlock(drbg);
return ret;
}
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