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Don't allow relative -walletdir paths

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Also warn if bitcoind is configured to use a relative -datadir path.

Specifying paths relative to the current working directory in a daemon process
can be dangerous, because files can fail to be located even if the
configuration doesn't change, but the daemon is started up differently.

Specifying a relative -datadir now adds a warning to the debug log. It would
not be backwards-compatible to forbid relative -datadir paths entirely, and it
could also be also inconvenient for command line testing.

Specifying a relative -walletdir now results in a startup error. But since the
-walletdir option is new in 0.16.0, there should be no compatibility issues.
Another reason not to use working directory paths for -walletdir specifically
is that the default -walletdir is a "wallets" subdirectory inside the datadir,
so it could be surprising that setting -walletdir manually would choose a
directory rooted in a completely different location.
This commit is contained in:
Russell Yanofsky 2018-01-18 13:15:00 -05:00
parent e839d6570d
commit ec527c6c88
7 changed files with 32 additions and 16 deletions
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5
doc/release-notes.md
View File

@ -90,9 +90,8 @@ bitcoin data directory. The behavior is now:
already exists in the data directory root, then wallets will be stored in the
`wallets/` subdirectory by default.
- The location of the wallets directory can be overridden by specifying a
`-walletdir=<path>` option where `<path>` can be an absolute path or a
relative path (relative to the current working directory). `<path>` can
also be a path to symlink to a directory.
`-walletdir=<path>` option where `<path>` can be an absolute path to a
directory or directory symlink.
Care should be taken when choosing the wallets directory location, as if it
becomes unavailable during operation, funds may be lost.

9
src/init.cpp
View File

@ -1210,6 +1210,15 @@ bool AppInitMain(boost::thread_group& threadGroup, CScheduler& scheduler)
LogPrintf("Using config file %s\n", GetConfigFile(gArgs.GetArg("-conf", BITCOIN_CONF_FILENAME)).string());
LogPrintf("Using at most %i automatic connections (%i file descriptors available)\n", nMaxConnections, nFD);
// Warn about relative -datadir path.
if (gArgs.IsArgSet("-datadir") && !fs::path(gArgs.GetArg("-datadir", "")).is_absolute()) {
LogPrintf("Warning: relative datadir option '%s' specified, which will be interpreted relative to the "
"current working directory '%s'. This is fragile, because if bitcoin is started in the future "
"from a different location, it will be unable to locate the current data files. There could "
"also be data loss if bitcoin is started while in a temporary directory.\n",
gArgs.GetArg("-datadir", ""), fs::current_path().string());
}
InitSignatureCache();
InitScriptExecutionCache();

12
src/wallet/init.cpp
View File

@ -205,11 +205,15 @@ bool VerifyWallets()
return true;
}
if (gArgs.IsArgSet("-walletdir") && !fs::is_directory(GetWalletDir())) {
if (fs::exists(fs::system_complete(gArgs.GetArg("-walletdir", "")))) {
return InitError(strprintf(_("Specified -walletdir \"%s\" is not a directory"), gArgs.GetArg("-walletdir", "").c_str()));
if (gArgs.IsArgSet("-walletdir")) {
fs::path wallet_dir = gArgs.GetArg("-walletdir", "");
if (!fs::exists(wallet_dir)) {
return InitError(strprintf(_("Specified -walletdir \"%s\" does not exist"), wallet_dir.string()));
} else if (!fs::is_directory(wallet_dir)) {
return InitError(strprintf(_("Specified -walletdir \"%s\" is not a directory"), wallet_dir.string()));
} else if (!wallet_dir.is_absolute()) {
return InitError(strprintf(_("Specified -walletdir \"%s\" is a relative path"), wallet_dir.string()));
}
return InitError(strprintf(_("Specified -walletdir \"%s\" does not exist"), gArgs.GetArg("-walletdir", "").c_str()));
}
LogPrintf("Using wallet directory %s\n", GetWalletDir().string());

2
src/wallet/walletutil.cpp
View File

@ -9,7 +9,7 @@ fs::path GetWalletDir()
fs::path path;
if (gArgs.IsArgSet("-walletdir")) {
path = fs::system_complete(gArgs.GetArg("-walletdir", ""));
path = gArgs.GetArg("-walletdir", "");
if (!fs::is_directory(path)) {
// If the path specified doesn't exist, we return the deliberately
// invalid empty string.

4
test/functional/multiwallet.py
View File

@ -30,6 +30,10 @@ class MultiWalletTest(BitcoinTestFramework):
self.stop_nodes()
self.assert_start_raises_init_error(0, ['-walletdir=wallets'], 'Error: Specified -walletdir "wallets" does not exist')
self.assert_start_raises_init_error(0, ['-walletdir=wallets'], 'Error: Specified -walletdir "wallets" is a relative path', cwd=data_dir())
self.assert_start_raises_init_error(0, ['-walletdir=debug.log'], 'Error: Specified -walletdir "debug.log" is not a directory', cwd=data_dir())
# should not initialize if there are duplicate wallets
self.assert_start_raises_init_error(0, ['-wallet=w1', '-wallet=w1'], 'Error loading wallet w1. Duplicate -wallet filename specified.')

12
test/functional/test_framework/test_framework.py
View File

@ -220,18 +220,18 @@ class BitcoinTestFramework():
for i in range(num_nodes):
self.nodes.append(TestNode(i, self.options.tmpdir, extra_args[i], rpchost, timewait=timewait, binary=binary[i], stderr=None, mocktime=self.mocktime, coverage_dir=self.options.coveragedir, use_cli=self.options.usecli))
def start_node(self, i, extra_args=None, stderr=None):
def start_node(self, i, *args, **kwargs):
"""Start a bitcoind"""
node = self.nodes[i]
node.start(extra_args, stderr)
node.start(*args, **kwargs)
node.wait_for_rpc_connection()
if self.options.coveragedir is not None:
coverage.write_all_rpc_commands(self.options.coveragedir, node.rpc)
def start_nodes(self, extra_args=None):
def start_nodes(self, extra_args=None, *args, **kwargs):
"""Start multiple bitcoinds"""
if extra_args is None:
@ -239,7 +239,7 @@ class BitcoinTestFramework():
assert_equal(len(extra_args), self.num_nodes)
try:
for i, node in enumerate(self.nodes):
node.start(extra_args[i])
node.start(extra_args[i], *args, **kwargs)
for node in self.nodes:
node.wait_for_rpc_connection()
except:
@ -271,10 +271,10 @@ class BitcoinTestFramework():
self.stop_node(i)
self.start_node(i, extra_args)
def assert_start_raises_init_error(self, i, extra_args=None, expected_msg=None):
def assert_start_raises_init_error(self, i, extra_args=None, expected_msg=None, *args, **kwargs):
with tempfile.SpooledTemporaryFile(max_size=2**16) as log_stderr:
try:
self.start_node(i, extra_args, stderr=log_stderr)
self.start_node(i, extra_args, stderr=log_stderr, *args, **kwargs)
self.stop_node(i)
except Exception as e:
assert 'bitcoind exited' in str(e) # node must have shutdown

4
test/functional/test_framework/test_node.py
View File

@ -81,13 +81,13 @@ class TestNode():
assert self.rpc_connected and self.rpc is not None, "Error: no RPC connection"
return getattr(self.rpc, name)
def start(self, extra_args=None, stderr=None):
def start(self, extra_args=None, stderr=None, *args, **kwargs):
"""Start the node."""
if extra_args is None:
extra_args = self.extra_args
if stderr is None:
stderr = self.stderr
self.process = subprocess.Popen(self.args + extra_args, stderr=stderr)
self.process = subprocess.Popen(self.args + extra_args, stderr=stderr, *args, **kwargs)
self.running = True
self.log.debug("bitcoind started, waiting for RPC to come up")