mirror of
https://github.com/thegeeklab/ansible-later.git
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471 lines
16 KiB
Python
471 lines
16 KiB
Python
# Copyright 2013 Donald Stufft and individual contributors
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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from __future__ import absolute_import, division, print_function
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import sys
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from six import integer_types
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import nacl.exceptions as exc
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from nacl._sodium import ffi, lib
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from nacl.exceptions import ensure
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crypto_pwhash_scryptsalsa208sha256_STRPREFIX = \
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ffi.string(ffi.cast("char *",
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lib.crypto_pwhash_scryptsalsa208sha256_strprefix()
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)
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)[:]
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crypto_pwhash_scryptsalsa208sha256_SALTBYTES = \
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lib.crypto_pwhash_scryptsalsa208sha256_saltbytes()
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crypto_pwhash_scryptsalsa208sha256_STRBYTES = \
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lib.crypto_pwhash_scryptsalsa208sha256_strbytes()
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crypto_pwhash_scryptsalsa208sha256_PASSWD_MIN = \
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lib.crypto_pwhash_scryptsalsa208sha256_passwd_min()
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crypto_pwhash_scryptsalsa208sha256_PASSWD_MAX = \
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lib.crypto_pwhash_scryptsalsa208sha256_passwd_max()
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crypto_pwhash_scryptsalsa208sha256_BYTES_MIN = \
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lib.crypto_pwhash_scryptsalsa208sha256_bytes_min()
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crypto_pwhash_scryptsalsa208sha256_BYTES_MAX = \
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lib.crypto_pwhash_scryptsalsa208sha256_bytes_max()
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crypto_pwhash_scryptsalsa208sha256_MEMLIMIT_MIN = \
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lib.crypto_pwhash_scryptsalsa208sha256_memlimit_min()
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crypto_pwhash_scryptsalsa208sha256_MEMLIMIT_MAX = \
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lib.crypto_pwhash_scryptsalsa208sha256_memlimit_max()
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crypto_pwhash_scryptsalsa208sha256_OPSLIMIT_MIN = \
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lib.crypto_pwhash_scryptsalsa208sha256_opslimit_min()
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crypto_pwhash_scryptsalsa208sha256_OPSLIMIT_MAX = \
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lib.crypto_pwhash_scryptsalsa208sha256_opslimit_max()
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crypto_pwhash_scryptsalsa208sha256_OPSLIMIT_INTERACTIVE = \
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lib.crypto_pwhash_scryptsalsa208sha256_opslimit_interactive()
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crypto_pwhash_scryptsalsa208sha256_MEMLIMIT_INTERACTIVE = \
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lib.crypto_pwhash_scryptsalsa208sha256_memlimit_interactive()
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crypto_pwhash_scryptsalsa208sha256_OPSLIMIT_SENSITIVE = \
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lib.crypto_pwhash_scryptsalsa208sha256_opslimit_sensitive()
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crypto_pwhash_scryptsalsa208sha256_MEMLIMIT_SENSITIVE = \
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lib.crypto_pwhash_scryptsalsa208sha256_memlimit_sensitive()
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crypto_pwhash_ALG_ARGON2I13 = lib.crypto_pwhash_alg_argon2i13()
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crypto_pwhash_ALG_ARGON2ID13 = lib.crypto_pwhash_alg_argon2id13()
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crypto_pwhash_ALG_DEFAULT = lib.crypto_pwhash_alg_default()
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crypto_pwhash_SALTBYTES = lib.crypto_pwhash_saltbytes()
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crypto_pwhash_STRBYTES = lib.crypto_pwhash_strbytes()
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crypto_pwhash_PASSWD_MIN = lib.crypto_pwhash_passwd_min()
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crypto_pwhash_PASSWD_MAX = lib.crypto_pwhash_passwd_max()
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crypto_pwhash_BYTES_MIN = lib.crypto_pwhash_bytes_min()
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crypto_pwhash_BYTES_MAX = lib.crypto_pwhash_bytes_max()
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crypto_pwhash_argon2i_STRPREFIX = \
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ffi.string(ffi.cast("char *",
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lib.crypto_pwhash_argon2i_strprefix()
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)
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)[:]
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crypto_pwhash_argon2i_MEMLIMIT_MIN = \
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lib.crypto_pwhash_argon2i_memlimit_min()
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crypto_pwhash_argon2i_MEMLIMIT_MAX = \
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lib.crypto_pwhash_argon2i_memlimit_max()
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crypto_pwhash_argon2i_OPSLIMIT_MIN = \
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lib.crypto_pwhash_argon2i_opslimit_min()
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crypto_pwhash_argon2i_OPSLIMIT_MAX = \
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lib.crypto_pwhash_argon2i_opslimit_max()
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crypto_pwhash_argon2i_OPSLIMIT_INTERACTIVE = \
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lib.crypto_pwhash_argon2i_opslimit_interactive()
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crypto_pwhash_argon2i_MEMLIMIT_INTERACTIVE = \
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lib.crypto_pwhash_argon2i_memlimit_interactive()
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crypto_pwhash_argon2i_OPSLIMIT_MODERATE = \
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lib.crypto_pwhash_argon2i_opslimit_moderate()
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crypto_pwhash_argon2i_MEMLIMIT_MODERATE = \
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lib.crypto_pwhash_argon2i_memlimit_moderate()
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crypto_pwhash_argon2i_OPSLIMIT_SENSITIVE = \
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lib.crypto_pwhash_argon2i_opslimit_sensitive()
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crypto_pwhash_argon2i_MEMLIMIT_SENSITIVE = \
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lib.crypto_pwhash_argon2i_memlimit_sensitive()
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crypto_pwhash_argon2id_STRPREFIX = \
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ffi.string(ffi.cast("char *",
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lib.crypto_pwhash_argon2id_strprefix()
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)
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)[:]
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crypto_pwhash_argon2id_MEMLIMIT_MIN = \
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lib.crypto_pwhash_argon2id_memlimit_min()
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crypto_pwhash_argon2id_MEMLIMIT_MAX = \
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lib.crypto_pwhash_argon2id_memlimit_max()
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crypto_pwhash_argon2id_OPSLIMIT_MIN = \
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lib.crypto_pwhash_argon2id_opslimit_min()
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crypto_pwhash_argon2id_OPSLIMIT_MAX = \
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lib.crypto_pwhash_argon2id_opslimit_max()
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crypto_pwhash_argon2id_OPSLIMIT_INTERACTIVE = \
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lib.crypto_pwhash_argon2id_opslimit_interactive()
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crypto_pwhash_argon2id_MEMLIMIT_INTERACTIVE = \
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lib.crypto_pwhash_argon2id_memlimit_interactive()
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crypto_pwhash_argon2id_OPSLIMIT_MODERATE = \
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lib.crypto_pwhash_argon2id_opslimit_moderate()
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crypto_pwhash_argon2id_MEMLIMIT_MODERATE = \
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lib.crypto_pwhash_argon2id_memlimit_moderate()
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crypto_pwhash_argon2id_OPSLIMIT_SENSITIVE = \
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lib.crypto_pwhash_argon2id_opslimit_sensitive()
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crypto_pwhash_argon2id_MEMLIMIT_SENSITIVE = \
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lib.crypto_pwhash_argon2id_memlimit_sensitive()
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SCRYPT_OPSLIMIT_INTERACTIVE = \
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crypto_pwhash_scryptsalsa208sha256_OPSLIMIT_INTERACTIVE
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SCRYPT_MEMLIMIT_INTERACTIVE = \
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crypto_pwhash_scryptsalsa208sha256_MEMLIMIT_INTERACTIVE
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SCRYPT_OPSLIMIT_SENSITIVE = \
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crypto_pwhash_scryptsalsa208sha256_OPSLIMIT_SENSITIVE
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SCRYPT_MEMLIMIT_SENSITIVE = \
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crypto_pwhash_scryptsalsa208sha256_MEMLIMIT_SENSITIVE
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SCRYPT_SALTBYTES = \
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crypto_pwhash_scryptsalsa208sha256_SALTBYTES
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SCRYPT_STRBYTES = \
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crypto_pwhash_scryptsalsa208sha256_STRBYTES
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SCRYPT_PR_MAX = ((1 << 30) - 1)
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LOG2_UINT64_MAX = 63
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UINT64_MAX = (1 << 64) - 1
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SCRYPT_MAX_MEM = 32 * (1024 * 1024)
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def _check_memory_occupation(n, r, p, maxmem=SCRYPT_MAX_MEM):
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ensure(r != 0, 'Invalid block size',
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raising=exc.ValueError)
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ensure(p != 0, 'Invalid parallelization factor',
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raising=exc.ValueError)
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ensure((n & (n - 1)) == 0, 'Cost factor must be a power of 2',
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raising=exc.ValueError)
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ensure(n > 1, 'Cost factor must be at least 2',
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raising=exc.ValueError)
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ensure(p <= SCRYPT_PR_MAX / r,
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'p*r is greater than {0}'.format(SCRYPT_PR_MAX),
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raising=exc.ValueError)
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ensure(n < (1 << (16 * r)),
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raising=exc.ValueError)
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Blen = p * 128 * r
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i = UINT64_MAX / 128
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ensure(n + 2 <= i / r,
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raising=exc.ValueError)
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Vlen = 32 * r * (n + 2) * 4
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ensure(Blen <= UINT64_MAX - Vlen,
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raising=exc.ValueError)
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ensure(Blen <= sys.maxsize - Vlen,
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raising=exc.ValueError)
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ensure(Blen + Vlen <= maxmem,
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'Memory limit would be exceeded with the choosen n, r, p',
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raising=exc.ValueError)
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def nacl_bindings_pick_scrypt_params(opslimit, memlimit):
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"""Python implementation of libsodium's pickparams"""
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if opslimit < 32768:
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opslimit = 32768
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r = 8
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if opslimit < (memlimit // 32):
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p = 1
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maxn = opslimit // (4 * r)
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for n_log2 in range(1, 63): # pragma: no branch
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if (2 ** n_log2) > (maxn // 2):
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break
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else:
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maxn = memlimit // (r * 128)
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for n_log2 in range(1, 63): # pragma: no branch
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if (2 ** n_log2) > maxn // 2:
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break
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maxrp = (opslimit // 4) // (2 ** n_log2)
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if maxrp > 0x3fffffff: # pragma: no cover
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maxrp = 0x3fffffff
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p = maxrp // r
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return n_log2, r, p
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def crypto_pwhash_scryptsalsa208sha256_ll(passwd, salt, n, r, p, dklen=64,
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maxmem=SCRYPT_MAX_MEM):
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"""
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Derive a cryptographic key using the ``passwd`` and ``salt``
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given as input.
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The work factor can be tuned by by picking different
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values for the parameters
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:param bytes passwd:
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:param bytes salt:
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:param bytes salt: *must* be *exactly* :py:const:`.SALTBYTES` long
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:param int dklen:
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:param int opslimit:
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:param int n:
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:param int r: block size,
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:param int p: the parallelism factor
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:param int maxmem: the maximum available memory available for scrypt's
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operations
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:rtype: bytes
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"""
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ensure(isinstance(n, integer_types),
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raising=TypeError)
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ensure(isinstance(r, integer_types),
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raising=TypeError)
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ensure(isinstance(p, integer_types),
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raising=TypeError)
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ensure(isinstance(passwd, bytes),
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raising=TypeError)
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ensure(isinstance(salt, bytes),
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raising=TypeError)
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_check_memory_occupation(n, r, p, maxmem)
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buf = ffi.new("uint8_t[]", dklen)
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ret = lib.crypto_pwhash_scryptsalsa208sha256_ll(passwd, len(passwd),
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salt, len(salt),
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n, r, p,
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buf, dklen)
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ensure(ret == 0, 'Unexpected failure in key derivation',
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raising=exc.RuntimeError)
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return ffi.buffer(ffi.cast("char *", buf), dklen)[:]
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def crypto_pwhash_scryptsalsa208sha256_str(
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passwd, opslimit=SCRYPT_OPSLIMIT_INTERACTIVE,
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memlimit=SCRYPT_MEMLIMIT_INTERACTIVE):
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"""
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Derive a cryptographic key using the ``passwd`` and ``salt``
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given as input, returning a string representation which includes
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the salt and the tuning parameters.
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The returned string can be directly stored as a password hash.
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See :py:func:`.crypto_pwhash_scryptsalsa208sha256` for a short
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discussion about ``opslimit`` and ``memlimit`` values.
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:param bytes passwd:
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:param int opslimit:
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:param int memlimit:
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:return: serialized key hash, including salt and tuning parameters
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:rtype: bytes
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"""
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buf = ffi.new("char[]", SCRYPT_STRBYTES)
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ret = lib.crypto_pwhash_scryptsalsa208sha256_str(buf, passwd,
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len(passwd),
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opslimit,
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memlimit)
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ensure(ret == 0, 'Unexpected failure in password hashing',
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raising=exc.RuntimeError)
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return ffi.string(buf)
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def crypto_pwhash_scryptsalsa208sha256_str_verify(passwd_hash, passwd):
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"""
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Verifies the ``passwd`` against the ``passwd_hash`` that was generated.
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Returns True or False depending on the success
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:param passwd_hash: bytes
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:param passwd: bytes
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:rtype: boolean
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"""
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ensure(len(passwd_hash) == SCRYPT_STRBYTES - 1, 'Invalid password hash',
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raising=exc.ValueError)
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ret = lib.crypto_pwhash_scryptsalsa208sha256_str_verify(passwd_hash,
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passwd,
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len(passwd))
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ensure(ret == 0,
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"Wrong password",
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raising=exc.InvalidkeyError)
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# all went well, therefore:
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return True
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def _check_argon2_limits_alg(opslimit, memlimit, alg):
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if (alg == crypto_pwhash_ALG_ARGON2I13):
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if memlimit < crypto_pwhash_argon2i_MEMLIMIT_MIN:
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raise exc.ValueError('memlimit must be at least {0} bytes'.format(
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crypto_pwhash_argon2i_MEMLIMIT_MIN))
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elif memlimit > crypto_pwhash_argon2i_MEMLIMIT_MAX:
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raise exc.ValueError('memlimit must be at most {0} bytes'.format(
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crypto_pwhash_argon2i_MEMLIMIT_MAX))
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if opslimit < crypto_pwhash_argon2i_OPSLIMIT_MIN:
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raise exc.ValueError('opslimit must be at least {0}'.format(
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crypto_pwhash_argon2i_OPSLIMIT_MIN))
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elif opslimit > crypto_pwhash_argon2i_OPSLIMIT_MAX:
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raise exc.ValueError('opslimit must be at most {0}'.format(
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crypto_pwhash_argon2i_OPSLIMIT_MAX))
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elif (alg == crypto_pwhash_ALG_ARGON2ID13):
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if memlimit < crypto_pwhash_argon2id_MEMLIMIT_MIN:
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raise exc.ValueError('memlimit must be at least {0} bytes'.format(
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crypto_pwhash_argon2id_MEMLIMIT_MIN))
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elif memlimit > crypto_pwhash_argon2id_MEMLIMIT_MAX:
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raise exc.ValueError('memlimit must be at most {0} bytes'.format(
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crypto_pwhash_argon2id_MEMLIMIT_MAX))
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if opslimit < crypto_pwhash_argon2id_OPSLIMIT_MIN:
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raise exc.ValueError('opslimit must be at least {0}'.format(
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crypto_pwhash_argon2id_OPSLIMIT_MIN))
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elif opslimit > crypto_pwhash_argon2id_OPSLIMIT_MAX:
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raise exc.ValueError('opslimit must be at most {0}'.format(
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crypto_pwhash_argon2id_OPSLIMIT_MAX))
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else:
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raise exc.TypeError('Unsupported algorithm')
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def crypto_pwhash_alg(outlen, passwd, salt, opslimit, memlimit, alg):
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"""
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Derive a raw cryptographic key using the ``passwd`` and the ``salt``
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given as input to the ``alg`` algorithm.
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:param outlen: the length of the derived key
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:type outlen: int
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:param passwd: The input password
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:type passwd: bytes
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:param opslimit: computational cost
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:type opslimit: int
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:param memlimit: memory cost
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:type memlimit: int
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:param alg: algorithm identifier
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:type alg: int
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:return: derived key
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:rtype: bytes
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"""
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ensure(isinstance(outlen, integer_types),
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raising=exc.TypeError)
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ensure(isinstance(opslimit, integer_types),
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raising=exc.TypeError)
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ensure(isinstance(memlimit, integer_types),
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raising=exc.TypeError)
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ensure(isinstance(alg, integer_types),
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raising=exc.TypeError)
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ensure(isinstance(passwd, bytes),
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raising=exc.TypeError)
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if len(salt) != crypto_pwhash_SALTBYTES:
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raise exc.ValueError("salt must be exactly {0} bytes long".format(
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crypto_pwhash_SALTBYTES))
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if outlen < crypto_pwhash_BYTES_MIN:
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raise exc.ValueError(
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'derived key must be at least {0} bytes long'.format(
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crypto_pwhash_BYTES_MIN))
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elif outlen > crypto_pwhash_BYTES_MAX:
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raise exc.ValueError(
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'derived key must be at most {0} bytes long'.format(
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crypto_pwhash_BYTES_MAX))
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_check_argon2_limits_alg(opslimit, memlimit, alg)
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outbuf = ffi.new("unsigned char[]", outlen)
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ret = lib.crypto_pwhash(outbuf, outlen, passwd, len(passwd),
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salt, opslimit, memlimit, alg)
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ensure(ret == 0, 'Unexpected failure in key derivation',
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raising=exc.RuntimeError)
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return ffi.buffer(outbuf, outlen)[:]
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def crypto_pwhash_str_alg(passwd, opslimit, memlimit, alg):
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"""
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Derive a cryptographic key using the ``passwd`` given as input
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and a random ``salt``, returning a string representation which
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includes the salt, the tuning parameters and the used algorithm.
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:param passwd: The input password
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:type passwd: bytes
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:param opslimit: computational cost
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:type opslimit: int
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:param memlimit: memory cost
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:type memlimit: int
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:param alg: The algorithm to use
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:type alg: int
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:return: serialized derived key and parameters
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:rtype: bytes
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"""
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ensure(isinstance(opslimit, integer_types),
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raising=TypeError)
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ensure(isinstance(memlimit, integer_types),
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raising=TypeError)
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ensure(isinstance(passwd, bytes),
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raising=TypeError)
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_check_argon2_limits_alg(opslimit, memlimit, alg)
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outbuf = ffi.new("char[]", 128)
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ret = lib.crypto_pwhash_str_alg(outbuf, passwd, len(passwd),
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opslimit, memlimit, alg)
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ensure(ret == 0, 'Unexpected failure in key derivation',
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raising=exc.RuntimeError)
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return ffi.string(outbuf)
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def crypto_pwhash_str_verify(passwd_hash, passwd):
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"""
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Verifies the ``passwd`` against a given password hash.
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Returns True on success, raises InvalidkeyError on failure
|
|
:param passwd_hash: saved password hash
|
|
:type passwd_hash: bytes
|
|
:param passwd: password to be checked
|
|
:type passwd: bytes
|
|
:return: success
|
|
:rtype: boolean
|
|
"""
|
|
ensure(isinstance(passwd_hash, bytes),
|
|
raising=TypeError)
|
|
ensure(isinstance(passwd, bytes),
|
|
raising=TypeError)
|
|
ensure(len(passwd_hash) <= 127,
|
|
"Hash must be at most 127 bytes long",
|
|
raising=exc.ValueError)
|
|
|
|
ret = lib.crypto_pwhash_str_verify(passwd_hash, passwd, len(passwd))
|
|
|
|
ensure(ret == 0,
|
|
"Wrong password",
|
|
raising=exc.InvalidkeyError)
|
|
# all went well, therefore:
|
|
return True
|
|
|
|
|
|
crypto_pwhash_argon2i_str_verify = crypto_pwhash_str_verify
|