root / lib / serializer.py @ 8e8092cc
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1 | 8d14b30d | Iustin Pop | #
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2 | 8d14b30d | Iustin Pop | #
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3 | 8d14b30d | Iustin Pop | |
4 | 8d14b30d | Iustin Pop | # Copyright (C) 2007, 2008 Google Inc.
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5 | 8d14b30d | Iustin Pop | #
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6 | 8d14b30d | Iustin Pop | # This program is free software; you can redistribute it and/or modify
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7 | 8d14b30d | Iustin Pop | # it under the terms of the GNU General Public License as published by
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8 | 8d14b30d | Iustin Pop | # the Free Software Foundation; either version 2 of the License, or
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9 | 8d14b30d | Iustin Pop | # (at your option) any later version.
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10 | 8d14b30d | Iustin Pop | #
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11 | 8d14b30d | Iustin Pop | # This program is distributed in the hope that it will be useful, but
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12 | 8d14b30d | Iustin Pop | # WITHOUT ANY WARRANTY; without even the implied warranty of
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13 | 8d14b30d | Iustin Pop | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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14 | 8d14b30d | Iustin Pop | # General Public License for more details.
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15 | 8d14b30d | Iustin Pop | #
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16 | 8d14b30d | Iustin Pop | # You should have received a copy of the GNU General Public License
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17 | 8d14b30d | Iustin Pop | # along with this program; if not, write to the Free Software
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18 | 8d14b30d | Iustin Pop | # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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19 | 8d14b30d | Iustin Pop | # 02110-1301, USA.
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20 | 8d14b30d | Iustin Pop | |
21 | 8d14b30d | Iustin Pop | """Serializer abstraction module
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22 | 8d14b30d | Iustin Pop |
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23 | 8d14b30d | Iustin Pop | This module introduces a simple abstraction over the serialization
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24 | 8d14b30d | Iustin Pop | backend (currently json).
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25 | 8d14b30d | Iustin Pop |
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26 | 8d14b30d | Iustin Pop | """
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27 | b459a848 | Andrea Spadaccini | # pylint: disable=C0103
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28 | fe267188 | Iustin Pop | |
29 | fe267188 | Iustin Pop | # C0103: Invalid name, since pylint doesn't see that Dump points to a
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30 | fe267188 | Iustin Pop | # function and not a constant
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31 | 8d14b30d | Iustin Pop | |
32 | 8d14b30d | Iustin Pop | import re |
33 | f4a2f532 | Guido Trotter | |
34 | b76fd1bc | Michael Hanselmann | # Python 2.6 and above contain a JSON module based on simplejson. Unfortunately
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35 | b76fd1bc | Michael Hanselmann | # the standard library version is significantly slower than the external
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36 | b76fd1bc | Michael Hanselmann | # module. While it should be better from at least Python 3.2 on (see Python
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37 | b76fd1bc | Michael Hanselmann | # issue 7451), for now Ganeti needs to work well with older Python versions
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38 | b76fd1bc | Michael Hanselmann | # too.
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39 | b76fd1bc | Michael Hanselmann | import simplejson |
40 | b76fd1bc | Michael Hanselmann | |
41 | f4a2f532 | Guido Trotter | from ganeti import errors |
42 | 615aaaba | Michael Hanselmann | from ganeti import utils |
43 | 071448fb | Michael Hanselmann | |
44 | d357f531 | Michael Hanselmann | |
45 | d0c8c01d | Iustin Pop | _RE_EOLSP = re.compile("[ \t]+$", re.MULTILINE)
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46 | 8d14b30d | Iustin Pop | |
47 | 8d14b30d | Iustin Pop | |
48 | a182a3ed | Michael Hanselmann | def DumpJson(data): |
49 | 8d14b30d | Iustin Pop | """Serialize a given object.
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50 | 8d14b30d | Iustin Pop |
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51 | c41eea6e | Iustin Pop | @param data: the data to serialize
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52 | c41eea6e | Iustin Pop | @return: the string representation of data
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53 | 071448fb | Michael Hanselmann |
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54 | 8d14b30d | Iustin Pop | """
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55 | a182a3ed | Michael Hanselmann | encoded = simplejson.dumps(data) |
56 | 071448fb | Michael Hanselmann | |
57 | a182a3ed | Michael Hanselmann | txt = _RE_EOLSP.sub("", encoded)
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58 | d0c8c01d | Iustin Pop | if not txt.endswith("\n"): |
59 | d0c8c01d | Iustin Pop | txt += "\n"
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60 | d357f531 | Michael Hanselmann | |
61 | 8d14b30d | Iustin Pop | return txt
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62 | 8d14b30d | Iustin Pop | |
63 | 8d14b30d | Iustin Pop | |
64 | 228538cf | Michael Hanselmann | def LoadJson(txt): |
65 | 8d14b30d | Iustin Pop | """Unserialize data from a string.
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66 | 8d14b30d | Iustin Pop |
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67 | c41eea6e | Iustin Pop | @param txt: the json-encoded form
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68 | c41eea6e | Iustin Pop |
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69 | c41eea6e | Iustin Pop | @return: the original data
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70 | c41eea6e | Iustin Pop |
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71 | 8d14b30d | Iustin Pop | """
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72 | cdeda3b6 | Michael Hanselmann | return simplejson.loads(txt)
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73 | 228538cf | Michael Hanselmann | |
74 | 228538cf | Michael Hanselmann | |
75 | 72ca1dcb | Balazs Lecz | def DumpSignedJson(data, key, salt=None, key_selector=None): |
76 | f4a2f532 | Guido Trotter | """Serialize a given object and authenticate it.
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77 | f4a2f532 | Guido Trotter |
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78 | f4a2f532 | Guido Trotter | @param data: the data to serialize
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79 | f4a2f532 | Guido Trotter | @param key: shared hmac key
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80 | 72ca1dcb | Balazs Lecz | @param key_selector: name/id that identifies the key (in case there are
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81 | 72ca1dcb | Balazs Lecz | multiple keys in use, e.g. in a multi-cluster environment)
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82 | f4a2f532 | Guido Trotter | @return: the string representation of data signed by the hmac key
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83 | f4a2f532 | Guido Trotter |
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84 | f4a2f532 | Guido Trotter | """
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85 | a182a3ed | Michael Hanselmann | txt = DumpJson(data) |
86 | f4a2f532 | Guido Trotter | if salt is None: |
87 | d0c8c01d | Iustin Pop | salt = ""
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88 | f4a2f532 | Guido Trotter | signed_dict = { |
89 | d0c8c01d | Iustin Pop | "msg": txt,
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90 | d0c8c01d | Iustin Pop | "salt": salt,
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91 | 3718bf6d | Michael Hanselmann | } |
92 | 3718bf6d | Michael Hanselmann | |
93 | 72ca1dcb | Balazs Lecz | if key_selector:
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94 | 72ca1dcb | Balazs Lecz | signed_dict["key_selector"] = key_selector
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95 | 72ca1dcb | Balazs Lecz | else:
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96 | 3718bf6d | Michael Hanselmann | key_selector = ""
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97 | 3718bf6d | Michael Hanselmann | |
98 | 3718bf6d | Michael Hanselmann | signed_dict["hmac"] = utils.Sha1Hmac(key, txt, salt=salt + key_selector)
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99 | 72ca1dcb | Balazs Lecz | |
100 | a182a3ed | Michael Hanselmann | return DumpJson(signed_dict)
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101 | f4a2f532 | Guido Trotter | |
102 | f4a2f532 | Guido Trotter | |
103 | 4e9dac14 | Guido Trotter | def LoadSignedJson(txt, key): |
104 | f4a2f532 | Guido Trotter | """Verify that a given message was signed with the given key, and load it.
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105 | f4a2f532 | Guido Trotter |
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106 | f4a2f532 | Guido Trotter | @param txt: json-encoded hmac-signed message
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107 | 72ca1dcb | Balazs Lecz | @param key: the shared hmac key or a callable taking one argument (the key
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108 | 72ca1dcb | Balazs Lecz | selector), which returns the hmac key belonging to the key selector.
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109 | 72ca1dcb | Balazs Lecz | Typical usage is to pass a reference to the get method of a dict.
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110 | f4a2f532 | Guido Trotter | @rtype: tuple of original data, string
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111 | 4e9dac14 | Guido Trotter | @return: original data, salt
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112 | f4a2f532 | Guido Trotter | @raises errors.SignatureError: if the message signature doesn't verify
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113 | f4a2f532 | Guido Trotter |
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114 | f4a2f532 | Guido Trotter | """
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115 | f4a2f532 | Guido Trotter | signed_dict = LoadJson(txt) |
116 | f4a2f532 | Guido Trotter | if not isinstance(signed_dict, dict): |
117 | d0c8c01d | Iustin Pop | raise errors.SignatureError("Invalid external message") |
118 | f4a2f532 | Guido Trotter | try:
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119 | d0c8c01d | Iustin Pop | msg = signed_dict["msg"]
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120 | d0c8c01d | Iustin Pop | salt = signed_dict["salt"]
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121 | d0c8c01d | Iustin Pop | hmac_sign = signed_dict["hmac"]
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122 | f4a2f532 | Guido Trotter | except KeyError: |
123 | d0c8c01d | Iustin Pop | raise errors.SignatureError("Invalid external message") |
124 | f4a2f532 | Guido Trotter | |
125 | 72ca1dcb | Balazs Lecz | if callable(key): |
126 | b459a848 | Andrea Spadaccini | # pylint: disable=E1103
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127 | 72ca1dcb | Balazs Lecz | key_selector = signed_dict.get("key_selector", None) |
128 | 72ca1dcb | Balazs Lecz | hmac_key = key(key_selector) |
129 | 72ca1dcb | Balazs Lecz | if not hmac_key: |
130 | 72ca1dcb | Balazs Lecz | raise errors.SignatureError("No key with key selector '%s' found" % |
131 | 72ca1dcb | Balazs Lecz | key_selector) |
132 | 72ca1dcb | Balazs Lecz | else:
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133 | 72ca1dcb | Balazs Lecz | key_selector = ""
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134 | 72ca1dcb | Balazs Lecz | hmac_key = key |
135 | 72ca1dcb | Balazs Lecz | |
136 | 3718bf6d | Michael Hanselmann | if not utils.VerifySha1Hmac(hmac_key, msg, hmac_sign, |
137 | 3718bf6d | Michael Hanselmann | salt=salt + key_selector): |
138 | d0c8c01d | Iustin Pop | raise errors.SignatureError("Invalid Signature") |
139 | f4a2f532 | Guido Trotter | |
140 | 4e9dac14 | Guido Trotter | return LoadJson(msg), salt
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141 | f4a2f532 | Guido Trotter | |
142 | f4a2f532 | Guido Trotter | |
143 | 228538cf | Michael Hanselmann | Dump = DumpJson |
144 | 228538cf | Michael Hanselmann | Load = LoadJson |
145 | f4a2f532 | Guido Trotter | DumpSigned = DumpSignedJson |
146 | f4a2f532 | Guido Trotter | LoadSigned = LoadSignedJson |