summaryrefslogtreecommitdiffstats
path: root/Lib/netrc.py
blob: 4b18973d51e344958d62d9125379fcb53cf20af5 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
"""An object-oriented interface to .netrc files."""

# Module and documentation by Eric S. Raymond, 21 Dec 1998

import os, stat, shlex
if os.name == 'posix':
    import pwd

__all__ = ["netrc", "NetrcParseError"]


class NetrcParseError(Exception):
    """Exception raised on syntax errors in the .netrc file."""
    def __init__(self, msg, filename=None, lineno=None):
        self.filename = filename
        self.lineno = lineno
        self.msg = msg
        Exception.__init__(self, msg)

    def __str__(self):
        return "%s (%s, line %s)" % (self.msg, self.filename, self.lineno)


class netrc:
    def __init__(self, file=None):
        default_netrc = file is None
        if file is None:
            try:
                file = os.path.join(os.environ['HOME'], ".netrc")
            except KeyError:
                raise IOError("Could not find .netrc: $HOME is not set")
        self.hosts = {}
        self.macros = {}
        with open(file) as fp:
            self._parse(file, fp, default_netrc)

    def _parse(self, file, fp, default_netrc):
        lexer = shlex.shlex(fp)
        lexer.wordchars += r"""!"#$%&'()*+,-./:;<=>?@[\]^_`{|}~"""
        lexer.commenters = lexer.commenters.replace('#', '')
        while 1:
            # Look for a machine, default, or macdef top-level keyword
            toplevel = tt = lexer.get_token()
            if not tt:
                break
            elif tt[0] == '#':
                # seek to beginning of comment, in case reading the token put
                # us on a new line, and then skip the rest of the line.
                pos = len(tt) + 1
                lexer.instream.seek(-pos, 1)
                lexer.instream.readline()
                continue
            elif tt == 'machine':
                entryname = lexer.get_token()
            elif tt == 'default':
                entryname = 'default'
            elif tt == 'macdef':                # Just skip to end of macdefs
                entryname = lexer.get_token()
                self.macros[entryname] = []
                lexer.whitespace = ' \t'
                while 1:
                    line = lexer.instream.readline()
                    if not line or line == '\012':
                        lexer.whitespace = ' \t\r\n'
                        break
                    self.macros[entryname].append(line)
                continue
            else:
                raise NetrcParseError(
                    "bad toplevel token %r" % tt, file, lexer.lineno)

            # We're looking at start of an entry for a named machine or default.
            login = ''
            account = password = None
            self.hosts[entryname] = {}
            while 1:
                tt = lexer.get_token()
                if (tt.startswith('#') or
                    tt in {'', 'machine', 'default', 'macdef'}):
                    if password:
                        self.hosts[entryname] = (login, account, password)
                        lexer.push_token(tt)
                        break
                    else:
                        raise NetrcParseError(
                            "malformed %s entry %s terminated by %s"
                            % (toplevel, entryname, repr(tt)),
                            file, lexer.lineno)
                elif tt == 'login' or tt == 'user':
                    login = lexer.get_token()
                elif tt == 'account':
                    account = lexer.get_token()
                elif tt == 'password':
                    if os.name == 'posix' and default_netrc:
                        prop = os.fstat(fp.fileno())
                        if prop.st_uid != os.getuid():
                            try:
                                fowner = pwd.getpwuid(prop.st_uid)[0]
                            except KeyError:
                                fowner = 'uid %s' % prop.st_uid
                            try:
                                user = pwd.getpwuid(os.getuid())[0]
                            except KeyError:
                                user = 'uid %s' % os.getuid()
                            raise NetrcParseError(
                                ("~/.netrc file owner (%s) does not match"
                                 " current user (%s)") % (fowner, user),
                                file, lexer.lineno)
                        if (prop.st_mode & (stat.S_IRWXG | stat.S_IRWXO)):
                            raise NetrcParseError(
                               "~/.netrc access too permissive: access"
                               " permissions must restrict access to only"
                               " the owner", file, lexer.lineno)
                    password = lexer.get_token()
                else:
                    raise NetrcParseError("bad follower token %r" % tt,
                                          file, lexer.lineno)

    def authenticators(self, host):
        """Return a (user, account, password) tuple for given host."""
        if host in self.hosts:
            return self.hosts[host]
        elif 'default' in self.hosts:
            return self.hosts['default']
        else:
            return None

    def __repr__(self):
        """Dump the class data in the format of a .netrc file."""
        rep = ""
        for host in self.hosts.keys():
            attrs = self.hosts[host]
            rep = rep + "machine "+ host + "\n\tlogin " + repr(attrs[0]) + "\n"
            if attrs[1]:
                rep = rep + "account " + repr(attrs[1])
            rep = rep + "\tpassword " + repr(attrs[2]) + "\n"
        for macro in self.macros.keys():
            rep = rep + "macdef " + macro + "\n"
            for line in self.macros[macro]:
                rep = rep + line
            rep = rep + "\n"
        return rep

if __name__ == '__main__':
    print netrc()