Jerry He created HBASE-13085:
--------------------------------
Summary: Security issue in the implementatoin of Rest gataway
'doAs' proxy user support
Key: HBASE-13085
URL: https://issues.apache.org/jira/browse/HBASE-13085
Project: HBase
Issue Type: Bug
Components: REST, security
Affects Versions: 0.98.10, 1.0.0, 2.0.0
Reporter: Jerry He
Assignee: Jerry He
Priority: Critical
When 'hbase.rest.support.proxyuser' is turned on, HBase Rest gateway support
'doAs' proxy user from the Rest client.
The current implementation checks to see if the 'rest server user' is
authorized to impersonate the 'doAs' user (the user in the 'doAs' Rest query
string).
{code}
if (doAsUserFromQuery != null) {
Configuration conf = servlet.getConfiguration();
if (!servlet.supportsProxyuser()) {
throw new ServletException("Support for proxyuser is not configured");
}
UserGroupInformation ugi = servlet.getRealUser();
// create and attempt to authorize a proxy user (the client is attempting
// to do proxy user)
ugi = UserGroupInformation.createProxyUser(doAsUserFromQuery, ugi);
// validate the proxy user authorization
try {
ProxyUsers.authorize(ugi, request.getRemoteAddr(), conf);
} catch(AuthorizationException e) {
throw new ServletException(e.getMessage());
}
servlet.setEffectiveUser(doAsUserFromQuery);
}
{code}
The current implementation allows anyone from the rest client side to
impersonate another user by 'doAs'.
For example, potentially, 'user1' can 'doAs=admin'
The correct implementation should check to see if the rest client user is
authorized to do impersonation.
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