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HADOOP-12344. Improve validateSocketPathSecurity0 error message (Casey Brotherton via Colin P. McCabe)

This commit is contained in:
Colin Patrick Mccabe 2015-10-13 12:18:03 -07:00
parent da16c9b3b4
commit 6716f15964
4 changed files with 53 additions and 23 deletions
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3
hadoop-common-project/hadoop-common/CHANGES.txt
View File

@ -882,6 +882,9 @@ Release 2.8.0 - UNRELEASED
HADOOP-11104. org.apache.hadoop.metrics2.lib.MetricsRegistry needs numerical
parameter checking. (Ray Chiang via aajisaka)
HADOOP-12344. Improve validateSocketPathSecurity0 error message (Casey
Brotherton via Colin P. McCabe)
OPTIMIZATIONS
HADOOP-11785. Reduce the number of listStatus operation in distcp

3
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/net/unix/DomainSocket.java
View File

@ -92,6 +92,9 @@ public class DomainSocket implements Closeable {
* misconfigurations. System administrators do not commonly change
* permissions on these paths while the server is running.
*
* For more information on Security exceptions see this wiki page:
* https://wiki.apache.org/hadoop/SocketPathSecurity
*
* @param path the path to validate
* @param skipComponents the number of starting path components to skip
* validation for (used only for testing)

63
hadoop-common-project/hadoop-common/src/main/native/src/org/apache/hadoop/net/unix/DomainSocket.c
View File

@ -268,7 +268,7 @@ Java_org_apache_hadoop_net_unix_DomainSocket_validateSocketPathSecurity0(
JNIEnv *env, jclass clazz, jobject jstr, jint skipComponents)
{
jint utfLength;
char path[PATH_MAX], check[PATH_MAX], *token, *rest;
char path[PATH_MAX], check[PATH_MAX], *token, *rest, *rest_free;
struct stat st;
int ret, mode, strlenPath;
uid_t uid;
@ -280,6 +280,7 @@ JNIEnv *env, jclass clazz, jobject jstr, jint skipComponents)
"no longer than %zd UTF-8 bytes.", (sizeof(path)-1));
goto done;
}
(*env)->GetStringUTFRegion(env, jstr, 0, utfLength, path);
path [ utfLength ] = 0;
jthr = (*env)->ExceptionOccurred(env);
@ -304,7 +305,16 @@ JNIEnv *env, jclass clazz, jobject jstr, jint skipComponents)
// last one. We don't validate the last component, since it's not supposed to
// be a directory. (If it is a directory, we will fail to create the socket
// later with EISDIR or similar.)
for (check[0] = '/', check[1] = '\0', rest = path, token = "";
rest=strdup(path);
if ( rest == NULL ){
ret = errno;
jthr = newIOException(env,"memory allocation failure trying to copy a path"
" with %d length. error code %d (%s). ", strlenPath, ret, terror(ret));
goto done;
};
rest_free=rest;
for (check[0] = '/', check[1] = '\0', token = "";
token && rest && rest[0];
token = strtok_r(rest, "/", &rest)) {
if (strcmp(check, "/") != 0) {
@ -322,36 +332,51 @@ JNIEnv *env, jclass clazz, jobject jstr, jint skipComponents)
}
if (stat(check, &st) < 0) {
ret = errno;
jthr = newIOException(env, "failed to stat a path component: '%s'. "
"error code %d (%s)", check, ret, terror(ret));
jthr = newIOException(env, "failed to stat a path component: "
"'%s' in '%s'. error code %d (%s). "
"Ensure that the path is configured correctly.",
check, path, ret, terror(ret));
goto done;
}
mode = st.st_mode & 0777;
if (mode & 0002) {
jthr = newIOException(env, "the path component: '%s' is "
"world-writable. Its permissions are 0%03o. Please fix "
"this or select a different socket path.", check, mode);
jthr = newIOException(env, "The path component: '%s' in '%s' has "
"permissions 0%03o uid %ld and gid %ld. "
"It is not protected because it "
"is world-writable. This might help: 'chmod o-w %s'. "
"For more information: "
"https://wiki.apache.org/hadoop/SocketPathSecurity",
check, path, mode, (long long)st.st_uid, (long long)st.st_gid, check);
goto done;
}
if ((mode & 0020) && (st.st_gid != 0)) {
jthr = newIOException(env, "the path component: '%s' is "
"group-writable, and the group is not root. Its permissions are "
"0%03o, and it is owned by gid %d. Please fix this or "
"select a different socket path.", check, mode, st.st_gid);
jthr = newIOException(env, "The path component: '%s' in '%s' has "
"permissions 0%03o uid %ld and gid %ld. "
"It is not protected because it "
"is group-writable and not owned by root. "
"This might help: 'chmod g-w %s' or 'chown root %s'. "
"For more information: "
"https://wiki.apache.org/hadoop/SocketPathSecurity",
check, path, mode, (long long)st.st_uid, (long long)st.st_gid,
check, check);
goto done;
}
if ((mode & 0200) && (st.st_uid != 0) &&
(st.st_uid != uid)) {
jthr = newIOException(env, "the path component: '%s' is "
"owned by a user who is not root and not you. Your effective user "
"id is %d; the path is owned by user id %d, and its permissions are "
"0%03o. Please fix this or select a different socket path.",
check, uid, st.st_uid, mode);
goto done;
if ((mode & 0200) && (st.st_uid != 0) && (st.st_uid != uid)) {
jthr = newIOException(env, "The path component: '%s' in '%s' has "
"permissions 0%03o uid %ld and gid %ld. "
"It is not protected because it "
"is owned by a user who is not root "
"and not the effective user: '%ld'. "
"This might help: 'chown root %s' or 'chown %ld %s'. "
"For more information: "
"https://wiki.apache.org/hadoop/SocketPathSecurity",
check, path, mode, (long long)st.st_uid, (long long)st.st_gid,
(long long)uid, check, (long long)uid, check);
goto done;
}
}
done:
if ( rest_free ) free(rest_free);
if (jthr) {
(*env)->Throw(env, jthr);
}

7
hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/net/unix/TestDomainSocket.java
View File

@ -712,9 +712,8 @@ public class TestDomainSocket {
try {
testValidateSocketPath(prefix + "/foo/bar/baz", prefix);
} catch (IOException e) {
GenericTestUtils.assertExceptionContains("/foo' is world-writable. " +
"Its permissions are 0707. Please fix this or select a " +
"different socket path.", e);
GenericTestUtils.assertExceptionContains("world-writable" ,e);
GenericTestUtils.assertExceptionContains("/foo'" ,e);
}
try {
testValidateSocketPath(prefix + "/nope", prefix);
@ -723,7 +722,7 @@ public class TestDomainSocket {
"component: ", e);
}
// Root should be secure
DomainSocket.validateSocketPathSecurity0("/foo", 1);
DomainSocket.validateSocketPathSecurity0("/foo", 0);
} finally {
tmp.close();
}