author | Yuya Nishihara <yuya@tcha.org> |
Fri, 20 Mar 2015 00:22:37 +0900 | |
changeset 24389 | 93d3e1a8bfb0 |
parent 23602 | a4679a74df14 |
child 25011 | 7d6a507a4c53 |
permissions | -rw-r--r-- |
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import os, errno, stat |
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import encoding |
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import util |
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from i18n import _ |
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def _lowerclean(s): |
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return encoding.hfsignoreclean(s.lower()) |
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class pathauditor(object): |
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'''ensure that a filesystem path contains no banned components. |
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the following properties of a path are checked: |
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- ends with a directory separator |
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- under top-level .hg |
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- starts at the root of a windows drive |
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- contains ".." |
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- traverses a symlink (e.g. a/symlink_here/b) |
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- inside a nested repository (a callback can be used to approve |
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some nested repositories, e.g., subrepositories) |
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''' |
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def __init__(self, root, callback=None): |
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self.audited = set() |
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self.auditeddir = set() |
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self.root = root |
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self.callback = callback |
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if os.path.lexists(root) and not util.checkcase(root): |
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self.normcase = util.normcase |
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else: |
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self.normcase = lambda x: x |
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def __call__(self, path): |
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'''Check the relative path. |
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path may contain a pattern (e.g. foodir/**.txt)''' |
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path = util.localpath(path) |
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normpath = self.normcase(path) |
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if normpath in self.audited: |
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return |
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# AIX ignores "/" at end of path, others raise EISDIR. |
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if util.endswithsep(path): |
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raise util.Abort(_("path ends in directory separator: %s") % path) |
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parts = util.splitpath(path) |
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if (os.path.splitdrive(path)[0] |
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or _lowerclean(parts[0]) in ('.hg', '.hg.', '') |
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or os.pardir in parts): |
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raise util.Abort(_("path contains illegal component: %s") % path) |
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# Windows shortname aliases |
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for p in parts: |
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if "~" in p: |
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first, last = p.split("~", 1) |
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if last.isdigit() and first.upper() in ["HG", "HG8B6C"]: |
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raise util.Abort(_("path contains illegal component: %s") |
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% path) |
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if '.hg' in _lowerclean(path): |
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lparts = [_lowerclean(p.lower()) for p in parts] |
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for p in '.hg', '.hg.': |
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if p in lparts[1:]: |
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pos = lparts.index(p) |
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base = os.path.join(*parts[:pos]) |
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raise util.Abort(_("path '%s' is inside nested repo %r") |
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% (path, base)) |
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normparts = util.splitpath(normpath) |
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assert len(parts) == len(normparts) |
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|
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parts.pop() |
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normparts.pop() |
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prefixes = [] |
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while parts: |
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prefix = os.sep.join(parts) |
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normprefix = os.sep.join(normparts) |
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if normprefix in self.auditeddir: |
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break |
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curpath = os.path.join(self.root, prefix) |
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try: |
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st = os.lstat(curpath) |
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except OSError, err: |
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# EINVAL can be raised as invalid path syntax under win32. |
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# They must be ignored for patterns can be checked too. |
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if err.errno not in (errno.ENOENT, errno.ENOTDIR, errno.EINVAL): |
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raise |
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else: |
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if stat.S_ISLNK(st.st_mode): |
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raise util.Abort( |
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_('path %r traverses symbolic link %r') |
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% (path, prefix)) |
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elif (stat.S_ISDIR(st.st_mode) and |
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os.path.isdir(os.path.join(curpath, '.hg'))): |
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if not self.callback or not self.callback(curpath): |
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raise util.Abort(_("path '%s' is inside nested " |
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"repo %r") |
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% (path, prefix)) |
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prefixes.append(normprefix) |
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parts.pop() |
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normparts.pop() |
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98 |
|
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self.audited.add(normpath) |
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# only add prefixes to the cache after checking everything: we don't |
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# want to add "foo/bar/baz" before checking if there's a "foo/.hg" |
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self.auditeddir.update(prefixes) |
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def check(self, path): |
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try: |
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self(path) |
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return True |
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108 |
except (OSError, util.Abort): |
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return False |
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110 |
|
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111 |
def canonpath(root, cwd, myname, auditor=None): |
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112 |
'''return the canonical path of myname, given cwd and root''' |
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113 |
if util.endswithsep(root): |
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114 |
rootsep = root |
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115 |
else: |
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116 |
rootsep = root + os.sep |
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name = myname |
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118 |
if not os.path.isabs(name): |
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name = os.path.join(root, cwd, name) |
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120 |
name = os.path.normpath(name) |
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121 |
if auditor is None: |
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122 |
auditor = pathauditor(root) |
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123 |
if name != rootsep and name.startswith(rootsep): |
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124 |
name = name[len(rootsep):] |
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125 |
auditor(name) |
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126 |
return util.pconvert(name) |
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127 |
elif name == root: |
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128 |
return '' |
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129 |
else: |
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130 |
# Determine whether `name' is in the hierarchy at or beneath `root', |
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131 |
# by iterating name=dirname(name) until that causes no change (can't |
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132 |
# check name == '/', because that doesn't work on windows). The list |
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133 |
# `rel' holds the reversed list of components making up the relative |
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134 |
# file name we want. |
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135 |
rel = [] |
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136 |
while True: |
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137 |
try: |
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138 |
s = util.samefile(name, root) |
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139 |
except OSError: |
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140 |
s = False |
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141 |
if s: |
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142 |
if not rel: |
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143 |
# name was actually the same as root (maybe a symlink) |
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144 |
return '' |
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145 |
rel.reverse() |
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146 |
name = os.path.join(*rel) |
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147 |
auditor(name) |
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148 |
return util.pconvert(name) |
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149 |
dirname, basename = util.split(name) |
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150 |
rel.append(basename) |
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151 |
if dirname == name: |
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152 |
break |
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153 |
name = dirname |
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154 |
|
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155 |
raise util.Abort(_("%s not under root '%s'") % (myname, root)) |
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156 |
|
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157 |
def normasprefix(path): |
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158 |
'''normalize the specified path as path prefix |
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159 |
|
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160 |
Returned value can be used safely for "p.startswith(prefix)", |
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161 |
"p[len(prefix):]", and so on. |
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162 |
|
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163 |
For efficiency, this expects "path" argument to be already |
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164 |
normalized by "os.path.normpath", "os.path.realpath", and so on. |
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165 |
|
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166 |
See also issue3033 for detail about need of this function. |
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167 |
|
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168 |
>>> normasprefix('/foo/bar').replace(os.sep, '/') |
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169 |
'/foo/bar/' |
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170 |
>>> normasprefix('/').replace(os.sep, '/') |
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171 |
'/' |
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172 |
''' |
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173 |
d, p = os.path.splitdrive(path) |
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174 |
if len(p) != len(os.sep): |
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175 |
return path + os.sep |
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176 |
else: |
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177 |
return path |