* autoload.cc (CryptAcquireContextW): Remove.
(CryptGenRandom): Remove. (CryptReleaseContext): Remove. (SystemFunction036): Define. Add comment to explain that this is actually the RtlGenRandom function. * fhandler.h (class fhandler_dev_random): Drop crypt_prov member. (fhandler_dev_random::fhandler_dev_random): Define inline. (fhandler_dev_random::dup): Drop declaration. * fhandler_random.cc (fhandler_dev_random::fhandler_dev_random): Remove here. (fhandler_dev_random::crypt_gen_random): Use RtlGenRandom to drop dependency to old Crypto API. (fhandler_dev_random::read): Implement an enhanced version of reading random bytes from RtlGenRandom for the sake of a better /dev/random emulation. (fhandler_dev_random::close): Just return 0 since crypt_prov doesn't exisyt anymore. (fhandler_dev_random::dup): Drop entirely for the same reason.
This commit is contained in:
Corinna Vinschen
parent
45ec2b422e
commit
2cbd31fe26
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@ -1,3 +1,24 @@
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2013-10-15 Corinna Vinschen <corinna@vinschen.de>
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* autoload.cc (CryptAcquireContextW): Remove.
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(CryptGenRandom): Remove.
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(CryptReleaseContext): Remove.
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(SystemFunction036): Define. Add comment to explain that this is
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actually the RtlGenRandom function.
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* fhandler.h (class fhandler_dev_random): Drop crypt_prov member.
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(fhandler_dev_random::fhandler_dev_random): Define inline.
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(fhandler_dev_random::dup): Drop declaration.
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* fhandler_random.cc (fhandler_dev_random::fhandler_dev_random): Remove
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here.
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(fhandler_dev_random::crypt_gen_random): Use RtlGenRandom to drop
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dependency to old Crypto API.
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(fhandler_dev_random::read): Implement an enhanced version of reading
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random bytes from RtlGenRandom for the sake of a better /dev/random
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emulation.
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(fhandler_dev_random::close): Just return 0 since crypt_prov doesn't
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exisyt anymore.
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(fhandler_dev_random::dup): Drop entirely for the same reason.
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2013-10-15 Corinna Vinschen <corinna@vinschen.de>
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* mmap.cc (mmap64): Convert pagesize from DWORD to size_t to avoid
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@ -537,9 +537,6 @@ wsock_init ()
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LoadDLLprime (ws2_32, _wsock_init, 0)
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LoadDLLfunc (CreateProcessAsUserW, 44, advapi32)
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LoadDLLfunc (CryptAcquireContextW, 20, advapi32)
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LoadDLLfunc (CryptGenRandom, 12, advapi32)
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LoadDLLfunc (CryptReleaseContext, 8, advapi32)
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LoadDLLfunc (DeregisterEventSource, 4, advapi32)
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LoadDLLfunc (LogonUserW, 24, advapi32)
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LoadDLLfunc (LookupAccountNameW, 28, advapi32)
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@ -563,6 +560,7 @@ LoadDLLfunc (RegQueryInfoKeyW, 48, advapi32)
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LoadDLLfunc (RegQueryValueExW, 24, advapi32)
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LoadDLLfunc (RegisterEventSourceW, 8, advapi32)
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LoadDLLfunc (ReportEventW, 36, advapi32)
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LoadDLLfunc (SystemFunction036, 8, advapi32) /* Aka "RtlGenRandom" */
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LoadDLLfunc (DnsQuery_A, 24, dnsapi)
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LoadDLLfunc (DnsRecordListFree, 8, dnsapi)
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@ -1652,7 +1652,6 @@ class fhandler_dev_zero: public fhandler_base
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class fhandler_dev_random: public fhandler_base
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{
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protected:
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HCRYPTPROV crypt_prov;
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uint32_t pseudo;
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off_t dummy_offset;
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@ -1661,14 +1660,13 @@ class fhandler_dev_random: public fhandler_base
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int pseudo_read (void *ptr, size_t len);
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public:
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fhandler_dev_random ();
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int open (int flags, mode_t mode = 0);
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ssize_t __stdcall write (const void *ptr, size_t len);
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void __reg3 read (void *ptr, size_t& len);
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off_t lseek (off_t offset, int whence);
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int close ();
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int dup (fhandler_base *child, int);
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fhandler_dev_random () : fhandler_base () {}
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fhandler_dev_random (void *) {}
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void copyto (fhandler_base *x)
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@ -1,8 +1,7 @@
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/* fhandler_random.cc: code to access /dev/random and /dev/urandom
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Copyright 2000, 2001, 2002, 2003, 2004, 2005, 2007, 2009, 2011 Red Hat, Inc.
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Written by Corinna Vinschen (vinschen@cygnus.com)
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Copyright 2000, 2001, 2002, 2003, 2004, 2005, 2007, 2009, 2011, 2013
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Red Hat, Inc.
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This file is part of Cygwin.
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@ -23,14 +22,12 @@ details. */
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#define RANDOM 8
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#define URANDOM 9
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/* The system PRNG is reseeded after reading 128K bytes. */
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#define RESEED_INTERVAL (128 * 1024)
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#define PSEUDO_MULTIPLIER (6364136223846793005LL)
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#define PSEUDO_SHIFTVAL (21)
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fhandler_dev_random::fhandler_dev_random ()
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: fhandler_base (), crypt_prov ((HCRYPTPROV) NULL)
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{
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}
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int
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fhandler_dev_random::open (int flags, mode_t)
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{
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@ -41,22 +38,18 @@ fhandler_dev_random::open (int flags, mode_t)
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return 1;
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}
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/* There's a bug in ntsecapi.h (Mingw as well as MSFT). SystemFunction036
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is, in fact, a WINAPI function, but it's not defined as such. Therefore
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we have to do it correctly here. */
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#define RtlGenRandom SystemFunction036
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extern "C" BOOLEAN WINAPI RtlGenRandom (PVOID, ULONG);
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bool
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fhandler_dev_random::crypt_gen_random (void *ptr, size_t len)
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{
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if (!crypt_prov
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&& !CryptAcquireContextW (&crypt_prov, NULL, MS_DEF_PROV_W, PROV_RSA_FULL,
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CRYPT_VERIFYCONTEXT | CRYPT_MACHINE_KEYSET)
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&& !CryptAcquireContextW (&crypt_prov, NULL, MS_DEF_PROV_W, PROV_RSA_FULL,
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CRYPT_VERIFYCONTEXT | CRYPT_MACHINE_KEYSET
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| CRYPT_NEWKEYSET))
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if (!RtlGenRandom (ptr, len))
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{
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debug_printf ("%E = CryptAquireContext()");
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return false;
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}
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if (!CryptGenRandom (crypt_prov, len, (BYTE *)ptr))
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{
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debug_printf ("%E = CryptGenRandom()");
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debug_printf ("%E = RtlGenRandom()");
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return false;
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}
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return true;
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@ -127,20 +120,35 @@ fhandler_dev_random::read (void *ptr, size_t& len)
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return;
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}
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if (crypt_gen_random (ptr, len))
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return;
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/* If device is /dev/urandom, use pseudo number generator as fallback.
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Don't do this for /dev/random since it's intended for uses that need
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very high quality randomness. */
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if (dev () == FH_URANDOM)
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/* /dev/random has to provide high quality random numbers. Therefore we
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re-seed the system PRNG for each block of 512 bytes. This results in
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sufficiently random sequences, comparable to the Linux /dev/random. */
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if (dev () == FH_RANDOM)
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{
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void *dummy = malloc (RESEED_INTERVAL);
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if (!dummy)
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{
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len = pseudo_read (ptr, len);
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return;
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}
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__seterrno ();
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len = (size_t) -1;
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return;
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}
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for (size_t offset = 0; offset < len; offset += 512)
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{
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if (!crypt_gen_random (dummy, RESEED_INTERVAL) ||
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!crypt_gen_random ((PBYTE) ptr + offset, len - offset))
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{
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__seterrno ();
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len = (size_t) -1;
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break;
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}
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}
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free (dummy);
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}
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/* If device is /dev/urandom, just use system RNG as is, with our own
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PRNG as fallback. */
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else if (!crypt_gen_random (ptr, len))
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len = pseudo_read (ptr, len);
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}
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off_t
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int
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fhandler_dev_random::close ()
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{
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if (!have_execed && crypt_prov)
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while (!CryptReleaseContext (crypt_prov, 0)
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&& GetLastError () == ERROR_BUSY)
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Sleep (10);
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return 0;
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}
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int
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fhandler_dev_random::dup (fhandler_base *child, int)
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{
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fhandler_dev_random *fhr = (fhandler_dev_random *) child;
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fhr->crypt_prov = (HCRYPTPROV)NULL;
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return 0;
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}
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