| 1 | # -*- coding: utf-8 -*-*- |
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| 2 | # |
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| 3 | # PyKota : Print Quotas for CUPS |
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| 4 | # |
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| 5 | # (c) 2003, 2004, 2005, 2006, 2007, 2008 Jerome Alet <alet@librelogiciel.com> |
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| 6 | # This program is free software: you can redistribute it and/or modify |
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| 7 | # it under the terms of the GNU General Public License as published by |
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| 8 | # the Free Software Foundation, either version 3 of the License, or |
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| 9 | # (at your option) any later version. |
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| 10 | # |
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| 11 | # This program is distributed in the hope that it will be useful, |
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| 12 | # but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 13 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 14 | # GNU General Public License for more details. |
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| 15 | # |
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| 16 | # You should have received a copy of the GNU General Public License |
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| 17 | # along with this program. If not, see <http://www.gnu.org/licenses/>. |
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| 18 | # |
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| 19 | # $Id$ |
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| 20 | # |
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| 21 | # |
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| 22 | |
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| 23 | """This module defines the base classes for PyKota command line tools.""" |
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| 24 | |
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| 25 | import sys |
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| 26 | import os |
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| 27 | import pwd |
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| 28 | import fnmatch |
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| 29 | import getopt |
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| 30 | import smtplib |
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| 31 | import locale |
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| 32 | import socket |
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| 33 | import time |
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| 34 | from email.MIMEText import MIMEText |
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| 35 | from email.Header import Header |
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| 36 | import email.Utils |
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| 37 | |
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| 38 | from mx import DateTime |
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| 39 | |
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| 40 | from pykota import utils |
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| 41 | from pykota.errors import PyKotaCommandLineError |
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| 42 | from pykota import config, storage, logger |
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| 43 | from pykota.version import __version__, __author__, __years__, __gplblurb__ |
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| 44 | |
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| 45 | class Tool : |
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| 46 | """Base class for tools with no database access.""" |
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| 47 | def __init__(self, doc="PyKota v%(__version__)s (c) %(__years__)s %(__author__)s") : |
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| 48 | """Initializes the command line tool.""" |
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| 49 | self.debug = True # in case of early failure |
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| 50 | self.logger = logger.openLogger("stderr") |
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| 51 | |
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| 52 | # Saves a copy of the locale settings |
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| 53 | (self.language, self.charset) = locale.getlocale() |
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| 54 | if not self.language : |
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| 55 | self.language = "C" |
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| 56 | if not self.charset : |
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| 57 | self.charset = "UTF-8" |
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| 58 | |
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| 59 | # pykota specific stuff |
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| 60 | self.documentation = doc |
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| 61 | |
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| 62 | # Extract the effective username |
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| 63 | uid = os.geteuid() |
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| 64 | try : |
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| 65 | self.effectiveUserName = pwd.getpwuid(uid)[0] |
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| 66 | except (KeyError, IndexError), msg : |
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| 67 | self.printInfo(_("Strange problem with uid(%s) : %s") % (uid, msg), "warn") |
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| 68 | self.effectiveUserName = os.getlogin() |
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| 69 | |
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| 70 | def deferredInit(self) : |
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| 71 | """Deferred initialization.""" |
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| 72 | confdir = os.environ.get("PYKOTA_HOME") |
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| 73 | environHome = True |
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| 74 | missingUser = False |
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| 75 | if confdir is None : |
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| 76 | environHome = False |
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| 77 | # check for config files in the 'pykota' user's home directory. |
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| 78 | try : |
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| 79 | self.pykotauser = pwd.getpwnam("pykota") |
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| 80 | confdir = self.pykotauser[5] |
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| 81 | except KeyError : |
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| 82 | self.pykotauser = None |
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| 83 | confdir = "/etc/pykota" |
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| 84 | missingUser = True |
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| 85 | |
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| 86 | self.config = config.PyKotaConfig(confdir) |
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| 87 | self.debug = self.config.getDebug() |
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| 88 | self.smtpserver = self.config.getSMTPServer() |
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| 89 | self.maildomain = self.config.getMailDomain() |
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| 90 | self.logger = logger.openLogger(self.config.getLoggingBackend()) |
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| 91 | |
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| 92 | # TODO : We NEED this here, even when not in an accounting filter/backend |
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| 93 | self.softwareJobSize = 0 |
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| 94 | self.softwareJobPrice = 0.0 |
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| 95 | |
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| 96 | if environHome : |
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| 97 | self.printInfo("PYKOTA_HOME environment variable is set. Configuration files were searched in %s" % confdir, "info") |
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| 98 | else : |
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| 99 | if missingUser : |
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| 100 | self.printInfo("The 'pykota' system account is missing. Configuration files were searched in %s instead." % confdir, "warn") |
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| 101 | |
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| 102 | self.logdebug("Language in use : %s" % self.language) |
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| 103 | self.logdebug("Charset in use : %s" % self.charset) |
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| 104 | |
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| 105 | arguments = " ".join(['"%s"' % arg for arg in sys.argv]) |
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| 106 | self.logdebug("Command line arguments : %s" % arguments) |
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| 107 | |
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| 108 | def display(self, message) : |
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| 109 | """Display a message after ensuring the correct charset is used.""" |
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| 110 | sys.stdout.write(message.encode(self.charset, |
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| 111 | "replace")) |
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| 112 | |
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| 113 | def logdebug(self, message) : |
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| 114 | """Logs something to debug output if debug is enabled.""" |
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| 115 | if self.debug : |
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| 116 | self.logger.log_message(message.encode(self.charset, \ |
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| 117 | "replace"), \ |
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| 118 | "debug") |
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| 119 | |
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| 120 | def printInfo(self, message, level="info") : |
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| 121 | """Sends a message to standard error.""" |
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| 122 | sys.stderr.write("%s: %s\n" % (level.upper(), \ |
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| 123 | message.encode(self.charset, \ |
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| 124 | "replace"))) |
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| 125 | sys.stderr.flush() |
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| 126 | |
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| 127 | def adminOnly(self, restricted=True) : |
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| 128 | """Raises an exception if the user is not a PyKota administrator.""" |
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| 129 | if restricted and not self.config.isAdmin : |
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| 130 | raise PyKotaCommandLineError, "%s : %s" % (pwd.getpwuid(os.geteuid())[0], _("You're not allowed to use this command.")) |
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| 131 | |
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| 132 | def matchString(self, s, patterns) : |
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| 133 | """Returns True if the string s matches one of the patterns, else False.""" |
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| 134 | if not patterns : |
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| 135 | return True # No pattern, always matches. |
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| 136 | else : |
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| 137 | for pattern in patterns : |
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| 138 | if fnmatch.fnmatchcase(s, pattern) : |
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| 139 | return True |
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| 140 | return False |
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| 141 | |
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| 142 | def sanitizeNames(self, names, isgroups) : |
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| 143 | """Sanitize users and groups names if needed.""" |
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| 144 | if not self.config.isAdmin : |
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| 145 | username = pwd.getpwuid(os.geteuid())[0] |
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| 146 | if isgroups : |
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| 147 | user = self.storage.getUser(username) |
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| 148 | if user.Exists : |
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| 149 | return [ g.Name for g in self.storage.getUserGroups(user) ] |
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| 150 | return [ username ] |
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| 151 | return names |
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| 152 | |
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| 153 | def display_version_and_quit(self) : |
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| 154 | """Displays version number, then exists successfully.""" |
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| 155 | try : |
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| 156 | self.clean() |
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| 157 | except AttributeError : |
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| 158 | pass |
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| 159 | self.display("%s\n" % __version__) |
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| 160 | sys.exit(0) |
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| 161 | |
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| 162 | def display_usage_and_quit(self) : |
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| 163 | """Displays command line usage, then exists successfully.""" |
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| 164 | try : |
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| 165 | self.clean() |
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| 166 | except AttributeError : |
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| 167 | pass |
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| 168 | self.display("%s\n" % (_(self.documentation) % globals())) |
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| 169 | self.display("%s\n\n" % __gplblurb__) |
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| 170 | self.display("%s %s\n" % (_("Please report bugs to :"), __author__)) |
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| 171 | sys.exit(0) |
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| 172 | |
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| 173 | def crashed(self, message="Bug in PyKota") : |
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| 174 | """Outputs a crash message, and optionally sends it to software author.""" |
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| 175 | msg = utils.crashed(message) |
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| 176 | fullmessage = "========== Traceback :\n\n%s\n\n========== sys.argv :\n\n%s\n\n========== Environment :\n\n%s\n" % \ |
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| 177 | (msg, \ |
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| 178 | "\n".join([" %s" % repr(a) for a in sys.argv]), \ |
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| 179 | "\n".join([" %s=%s" % (k, repr(v)) for (k, v) in os.environ.items()])) |
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| 180 | try : |
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| 181 | crashrecipient = self.config.getCrashRecipient() |
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| 182 | if crashrecipient : |
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| 183 | admin = self.config.getAdminMail("global") # Nice trick, isn't it ? |
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| 184 | server = smtplib.SMTP(self.smtpserver) |
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| 185 | msg = MIMEText(fullmessage.encode(self.charset, "replace"), _charset=self.charset) |
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| 186 | msg["Subject"] = Header("PyKota v%s crash traceback !" \ |
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| 187 | % __version__, charset=self.charset, errors="replace") |
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| 188 | msg["From"] = admin |
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| 189 | msg["To"] = crashrecipient |
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| 190 | msg["Cc"] = admin |
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| 191 | msg["Date"] = email.Utils.formatdate(localtime=True) |
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| 192 | server.sendmail(admin, [admin, crashrecipient], msg.as_string()) |
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| 193 | server.quit() |
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| 194 | except : |
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| 195 | self.printInfo("PyKota double crash !", "error") |
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| 196 | raise |
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| 197 | return fullmessage |
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| 198 | |
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| 199 | def parseCommandline(self, argv, short, long, allownothing=0) : |
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| 200 | """Parses the command line, controlling options.""" |
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| 201 | # split options in two lists: those which need an argument, those which don't need any |
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| 202 | short = "%sA:" % short |
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| 203 | long.append("arguments=") |
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| 204 | withoutarg = [] |
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| 205 | witharg = [] |
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| 206 | lgs = len(short) |
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| 207 | i = 0 |
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| 208 | while i < lgs : |
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| 209 | ii = i + 1 |
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| 210 | if (ii < lgs) and (short[ii] == ':') : |
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| 211 | # needs an argument |
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| 212 | witharg.append(short[i]) |
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| 213 | ii = ii + 1 # skip the ':' |
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| 214 | else : |
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| 215 | # doesn't need an argument |
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| 216 | withoutarg.append(short[i]) |
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| 217 | i = ii |
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| 218 | |
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| 219 | for option in long : |
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| 220 | if option[-1] == '=' : |
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| 221 | # needs an argument |
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| 222 | witharg.append(option[:-1]) |
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| 223 | else : |
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| 224 | # doesn't need an argument |
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| 225 | withoutarg.append(option) |
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| 226 | |
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| 227 | # then we parse the command line |
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| 228 | done = 0 |
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| 229 | while not done : |
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| 230 | # we begin with all possible options unset |
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| 231 | parsed = {} |
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| 232 | for option in withoutarg + witharg : |
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| 233 | parsed[option] = None |
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| 234 | args = [] # to not break if something unexpected happened |
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| 235 | try : |
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| 236 | options, args = getopt.getopt(argv, short, long) |
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| 237 | if options : |
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| 238 | for (o, v) in options : |
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| 239 | # we skip the '-' chars |
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| 240 | lgo = len(o) |
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| 241 | i = 0 |
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| 242 | while (i < lgo) and (o[i] == '-') : |
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| 243 | i = i + 1 |
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| 244 | o = o[i:] |
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| 245 | if o in witharg : |
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| 246 | # needs an argument : set it |
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| 247 | parsed[o] = v |
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| 248 | elif o in withoutarg : |
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| 249 | # doesn't need an argument : boolean |
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| 250 | parsed[o] = 1 |
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| 251 | else : |
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| 252 | # should never occur |
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| 253 | raise PyKotaCommandLineError, "Unexpected problem when parsing command line" |
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| 254 | elif (not args) and (not allownothing) and sys.stdin.isatty() : # no option and no argument, we display help if we are a tty |
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| 255 | self.display_usage_and_quit() |
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| 256 | except getopt.error, msg : |
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| 257 | raise PyKotaCommandLineError, str(msg) |
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| 258 | else : |
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| 259 | if parsed["arguments"] or parsed["A"] : |
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| 260 | # arguments are in a file, we ignore all other arguments |
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| 261 | # and reset the list of arguments to the lines read from |
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| 262 | # the file. |
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| 263 | argsfile = open(parsed["arguments"] or parsed["A"], "r") # TODO : charset decoding |
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| 264 | argv = [ l.strip() for l in argsfile.readlines() ] |
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| 265 | argsfile.close() |
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| 266 | for i in range(len(argv)) : |
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| 267 | argi = argv[i] |
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| 268 | if argi.startswith('"') and argi.endswith('"') : |
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| 269 | argv[i] = argi[1:-1] |
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| 270 | else : |
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| 271 | done = 1 |
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| 272 | return (parsed, args) |
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| 273 | |
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| 274 | class PyKotaTool(Tool) : |
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| 275 | """Base class for all PyKota command line tools.""" |
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| 276 | def deferredInit(self) : |
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| 277 | """Deferred initialization.""" |
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| 278 | Tool.deferredInit(self) |
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| 279 | self.storage = storage.openConnection(self) |
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| 280 | if self.config.isAdmin : # TODO : We don't know this before, fix this ! |
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| 281 | self.logdebug("Beware : running as a PyKota administrator !") |
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| 282 | else : |
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| 283 | self.logdebug("Don't Panic : running as a mere mortal !") |
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| 284 | |
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| 285 | def clean(self) : |
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| 286 | """Ensures that the database is closed.""" |
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| 287 | try : |
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| 288 | self.storage.close() |
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| 289 | except (TypeError, NameError, AttributeError) : |
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| 290 | pass |
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| 291 | |
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| 292 | def isValidName(self, name) : |
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| 293 | """Checks if a user or printer name is valid.""" |
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| 294 | invalidchars = "/@?*,;&|" |
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| 295 | for c in list(invalidchars) : |
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| 296 | if c in name : |
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| 297 | return False |
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| 298 | return True |
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| 299 | |
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| 300 | def _checkUserPQuota(self, userpquota) : |
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| 301 | """Checks the user quota on a printer and deny or accept the job.""" |
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| 302 | # then we check the user's own quota |
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| 303 | # if we get there we are sure that policy is not EXTERNAL |
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| 304 | user = userpquota.User |
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| 305 | printer = userpquota.Printer |
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| 306 | enforcement = self.config.getPrinterEnforcement(printer.Name) |
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| 307 | self.logdebug("Checking user %s's quota on printer %s" % (user.Name, printer.Name)) |
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| 308 | (policy, dummy) = self.config.getPrinterPolicy(userpquota.Printer.Name) |
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| 309 | if not userpquota.Exists : |
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| 310 | # Unknown userquota |
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| 311 | if policy == "ALLOW" : |
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| 312 | action = "POLICY_ALLOW" |
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| 313 | else : |
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| 314 | action = "POLICY_DENY" |
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| 315 | self.printInfo(_("Unable to match user %s on printer %s, applying default policy (%s)") % (user.Name, printer.Name, action)) |
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| 316 | else : |
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| 317 | pagecounter = int(userpquota.PageCounter or 0) |
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| 318 | if enforcement == "STRICT" : |
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| 319 | pagecounter += self.softwareJobSize |
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| 320 | if userpquota.SoftLimit is not None : |
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| 321 | softlimit = int(userpquota.SoftLimit) |
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| 322 | if pagecounter < softlimit : |
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| 323 | action = "ALLOW" |
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| 324 | else : |
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| 325 | if userpquota.HardLimit is None : |
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| 326 | # only a soft limit, this is equivalent to having only a hard limit |
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| 327 | action = "DENY" |
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| 328 | else : |
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| 329 | hardlimit = int(userpquota.HardLimit) |
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| 330 | if softlimit <= pagecounter < hardlimit : |
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| 331 | now = DateTime.now() |
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| 332 | if userpquota.DateLimit is not None : |
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| 333 | datelimit = DateTime.ISO.ParseDateTime(str(userpquota.DateLimit)[:19]) |
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| 334 | else : |
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| 335 | datelimit = now + self.config.getGraceDelay(printer.Name) |
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| 336 | userpquota.setDateLimit(datelimit) |
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| 337 | if now < datelimit : |
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| 338 | action = "WARN" |
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| 339 | else : |
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| 340 | action = "DENY" |
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| 341 | else : |
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| 342 | action = "DENY" |
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| 343 | else : |
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| 344 | if userpquota.HardLimit is not None : |
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| 345 | # no soft limit, only a hard one. |
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| 346 | hardlimit = int(userpquota.HardLimit) |
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| 347 | if pagecounter < hardlimit : |
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| 348 | action = "ALLOW" |
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| 349 | else : |
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| 350 | action = "DENY" |
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| 351 | else : |
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| 352 | # Both are unset, no quota, i.e. accounting only |
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| 353 | action = "ALLOW" |
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| 354 | return action |
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| 355 | |
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| 356 | def checkGroupPQuota(self, grouppquota) : |
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| 357 | """Checks the group quota on a printer and deny or accept the job.""" |
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| 358 | group = grouppquota.Group |
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| 359 | printer = grouppquota.Printer |
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| 360 | enforcement = self.config.getPrinterEnforcement(printer.Name) |
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| 361 | self.logdebug("Checking group %s's quota on printer %s" % (group.Name, printer.Name)) |
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| 362 | if group.LimitBy and (group.LimitBy.lower() == "balance") : |
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| 363 | val = group.AccountBalance or 0.0 |
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| 364 | if enforcement == "STRICT" : |
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| 365 | val -= self.softwareJobPrice # use precomputed size. |
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| 366 | balancezero = self.config.getBalanceZero() |
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| 367 | if val <= balancezero : |
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| 368 | action = "DENY" |
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| 369 | elif val <= self.config.getPoorMan() : |
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| 370 | action = "WARN" |
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| 371 | else : |
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| 372 | action = "ALLOW" |
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| 373 | if (enforcement == "STRICT") and (val == balancezero) : |
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| 374 | action = "WARN" # we can still print until account is 0 |
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| 375 | else : |
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| 376 | val = grouppquota.PageCounter or 0 |
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| 377 | if enforcement == "STRICT" : |
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| 378 | val += int(self.softwareJobSize) # TODO : this is not a fix, problem is elsewhere in grouppquota.PageCounter |
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| 379 | if grouppquota.SoftLimit is not None : |
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| 380 | softlimit = int(grouppquota.SoftLimit) |
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| 381 | if val < softlimit : |
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| 382 | action = "ALLOW" |
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| 383 | else : |
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| 384 | if grouppquota.HardLimit is None : |
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| 385 | # only a soft limit, this is equivalent to having only a hard limit |
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| 386 | action = "DENY" |
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| 387 | else : |
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| 388 | hardlimit = int(grouppquota.HardLimit) |
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| 389 | if softlimit <= val < hardlimit : |
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| 390 | now = DateTime.now() |
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| 391 | if grouppquota.DateLimit is not None : |
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| 392 | datelimit = DateTime.ISO.ParseDateTime(str(grouppquota.DateLimit)[:19]) |
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| 393 | else : |
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| 394 | datelimit = now + self.config.getGraceDelay(printer.Name) |
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| 395 | grouppquota.setDateLimit(datelimit) |
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| 396 | if now < datelimit : |
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| 397 | action = "WARN" |
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| 398 | else : |
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| 399 | action = "DENY" |
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| 400 | else : |
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| 401 | action = "DENY" |
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| 402 | else : |
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| 403 | if grouppquota.HardLimit is not None : |
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| 404 | # no soft limit, only a hard one. |
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| 405 | hardlimit = int(grouppquota.HardLimit) |
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| 406 | if val < hardlimit : |
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| 407 | action = "ALLOW" |
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| 408 | else : |
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| 409 | action = "DENY" |
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| 410 | else : |
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| 411 | # Both are unset, no quota, i.e. accounting only |
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| 412 | action = "ALLOW" |
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| 413 | return action |
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| 414 | |
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| 415 | def checkUserPQuota(self, userpquota) : |
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| 416 | """Checks the user quota on a printer and all its parents and deny or accept the job.""" |
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| 417 | user = userpquota.User |
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| 418 | printer = userpquota.Printer |
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| 419 | |
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| 420 | # indicates that a warning needs to be sent |
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| 421 | warned = False |
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| 422 | |
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| 423 | # first we check any group the user is a member of |
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| 424 | for group in self.storage.getUserGroups(user) : |
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| 425 | # No need to check anything if the group is in noquota mode |
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| 426 | if group.LimitBy != "noquota" : |
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| 427 | grouppquota = self.storage.getGroupPQuota(group, printer) |
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| 428 | # for the printer and all its parents |
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| 429 | for gpquota in [ grouppquota ] + grouppquota.ParentPrintersGroupPQuota : |
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| 430 | if gpquota.Exists : |
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| 431 | action = self.checkGroupPQuota(gpquota) |
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| 432 | if action == "DENY" : |
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| 433 | return action |
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| 434 | elif action == "WARN" : |
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| 435 | warned = True |
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| 436 | |
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| 437 | # Then we check the user's account balance |
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| 438 | # if we get there we are sure that policy is not EXTERNAL |
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| 439 | (policy, dummy) = self.config.getPrinterPolicy(printer.Name) |
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| 440 | if user.LimitBy and (user.LimitBy.lower() == "balance") : |
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| 441 | self.logdebug("Checking account balance for user %s" % user.Name) |
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| 442 | if user.AccountBalance is None : |
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| 443 | if policy == "ALLOW" : |
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| 444 | action = "POLICY_ALLOW" |
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| 445 | else : |
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| 446 | action = "POLICY_DENY" |
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| 447 | self.printInfo(_("Unable to find user %s's account balance, applying default policy (%s) for printer %s") % (user.Name, action, printer.Name)) |
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| 448 | return action |
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| 449 | else : |
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| 450 | if user.OverCharge == 0.0 : |
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| 451 | self.printInfo(_("User %s will not be charged for printing.") % user.Name) |
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| 452 | action = "ALLOW" |
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| 453 | else : |
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| 454 | val = float(user.AccountBalance or 0.0) |
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| 455 | enforcement = self.config.getPrinterEnforcement(printer.Name) |
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| 456 | if enforcement == "STRICT" : |
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| 457 | val -= self.softwareJobPrice # use precomputed size. |
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| 458 | balancezero = self.config.getBalanceZero() |
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| 459 | if val <= balancezero : |
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| 460 | action = "DENY" |
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| 461 | elif val <= self.config.getPoorMan() : |
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| 462 | action = "WARN" |
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| 463 | else : |
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| 464 | action = "ALLOW" |
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| 465 | if (enforcement == "STRICT") and (val == balancezero) : |
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| 466 | action = "WARN" # we can still print until account is 0 |
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| 467 | return action |
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| 468 | else : |
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| 469 | # Then check the user quota on current printer and all its parents. |
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| 470 | policyallowed = False |
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| 471 | for upquota in [ userpquota ] + userpquota.ParentPrintersUserPQuota : |
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| 472 | action = self._checkUserPQuota(upquota) |
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| 473 | if action in ("DENY", "POLICY_DENY") : |
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| 474 | return action |
|---|
| 475 | elif action == "WARN" : |
|---|
| 476 | warned = True |
|---|
| 477 | elif action == "POLICY_ALLOW" : |
|---|
| 478 | policyallowed = True |
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| 479 | if warned : |
|---|
| 480 | return "WARN" |
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| 481 | elif policyallowed : |
|---|
| 482 | return "POLICY_ALLOW" |
|---|
| 483 | else : |
|---|
| 484 | return "ALLOW" |
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| 485 | |
|---|
| 486 | def externalMailTo(self, cmd, action, user, printer, message) : |
|---|
| 487 | """Warns the user with an external command.""" |
|---|
| 488 | username = user.Name |
|---|
| 489 | printername = printer.Name |
|---|
| 490 | email = user.Email or user.Name |
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| 491 | if "@" not in email : |
|---|
| 492 | email = "%s@%s" % (email, self.maildomain or self.smtpserver) |
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| 493 | os.system(cmd % locals()) |
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| 494 | |
|---|
| 495 | def formatCommandLine(self, cmd, user, printer) : |
|---|
| 496 | """Executes an external command.""" |
|---|
| 497 | username = user.Name |
|---|
| 498 | printername = printer.Name |
|---|
| 499 | return cmd % locals() |
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