zauth_v2 (3) - Linux Manuals

zauth_v2: authentication for ZeroMQ servers (deprecated)

NAME

zauth_v2 - authentication for ZeroMQ servers (deprecated)

SYNOPSIS

#ifndef CURVE_ALLOW_ANY
#   define CURVE_ALLOW_ANY "*"
#endif

//  Constructor
//  Install authentication for the specified context. Returns a new zauth
//  object that you can use to configure authentication. Note that until you
//  add policies, all incoming NULL connections are allowed (classic ZeroMQ
//  behaviour), and all PLAIN and CURVE connections are denied. If there was
//  an error during initialization, returns NULL.
CZMQ_EXPORT zauth_t *
    zauth_new (zctx_t *ctx);

//  Destructor
CZMQ_EXPORT void
    zauth_destroy (zauth_t **self_p);

//  Allow (whitelist) a single IP address. For NULL, all clients from this
//  address will be accepted. For PLAIN and CURVE, they will be allowed to
//  continue with authentication. You can call this method multiple times
//  to whitelist multiple IP addresses. If you whitelist a single address,
//  any non-whitelisted addresses are treated as blacklisted.
CZMQ_EXPORT void
    zauth_allow (zauth_t *self, const char *address);

//  Deny (blacklist) a single IP address. For all security mechanisms, this
//  rejects the connection without any further authentication. Use either a
//  whitelist, or a blacklist, not not both. If you define both a whitelist
//  and a blacklist, only the whitelist takes effect.
CZMQ_EXPORT void
    zauth_deny (zauth_t *self, const char *address);

//  Configure PLAIN authentication for a given domain. PLAIN authentication
//  uses a plain-text password file. To cover all domains, use "*". You can
//  modify the password file at any time; it is reloaded automatically.
CZMQ_EXPORT void
    zauth_configure_plain (zauth_t *self, const char *domain, const char *filename);

//  Configure CURVE authentication for a given domain. CURVE authentication
//  uses a directory that holds all public client certificates, i.e. their
//  public keys. The certificates must be in zcert_save () format. To cover
//  all domains, use "*". You can add and remove certificates in that
//  directory at any time. To allow all client keys without checking, specify
//  CURVE_ALLOW_ANY for the location.
CZMQ_EXPORT void
    zauth_configure_curve (zauth_t *self, const char *domain, const char *location);

//  Configure GSSAPI authentication for a given domain. GSSAPI authentication
//  uses an underlying mechanism (usually Kerberos) to establish a secure
//  context and perform mutual authentication. To cover all domains, use "*".
CZMQ_EXPORT void
    zauth_configure_gssapi (zauth_t *self, char *domain);

//  Enable verbose tracing of commands and activity
CZMQ_EXPORT void
    zauth_set_verbose (zauth_t *self, bool verbose);

//  Selftest
CZMQ_EXPORT void
    zauth_v2_test (bool verbose);

DESCRIPTION

A zauth object takes over authentication for all incoming connections in its context.

This class is deprecated in CZMQ v3; it works together with zctx, zsocket, and other deprecated V2 classes. New applications should use the V3 zauth interface, based on zactor, together with the zsock class for sockets.

EXAMPLE

From zauth_v2_test method.

//  Create temporary directory for test files
#   define TESTDIR ".test_zauth"
zsys_dir_create (TESTDIR);

//  Install the authenticator
zctx_t *ctx = zctx_new ();
assert (ctx);
zauth_t *auth = zauth_new (ctx);
assert (auth);
zauth_set_verbose (auth, verbose);

//  A default NULL connection should always success, and not
//  go through our authentication infrastructure at all.
void *server = zsocket_new (ctx, ZMQ_PUSH);
assert (server);
void *client = zsocket_new (ctx, ZMQ_PULL);
assert (client);
bool success = s_can_connect (ctx, &server, &client);
assert (success);

//  When we set a domain on the server, we switch on authentication
//  for NULL sockets, but with no policies, the client connection
//  will be allowed.
zsocket_set_zap_domain (server, "global");
success = s_can_connect (ctx, &server, &client);
assert (success);

//  Blacklist 127.0.0.1, connection should fail
zsocket_set_zap_domain (server, "global");
zauth_deny (auth, "127.0.0.1");
success = s_can_connect (ctx, &server, &client);
assert (!success);

//  Whitelist our address, which overrides the blacklist
zsocket_set_zap_domain (server, "global");
zauth_allow (auth, "127.0.0.1");
success = s_can_connect (ctx, &server, &client);
assert (success);

//  Try PLAIN authentication
zsocket_set_plain_server (server, 1);
zsocket_set_plain_username (client, "admin");
zsocket_set_plain_password (client, "Password");
success = s_can_connect (ctx, &server, &client);
assert (!success);

FILE *password = fopen (TESTDIR "/password-file", "w");
assert (password);
fprintf (password, "admin=Password\n");
fclose (password);
zsocket_set_plain_server (server, 1);
zsocket_set_plain_username (client, "admin");
zsocket_set_plain_password (client, "Password");
zauth_configure_plain (auth, "*", TESTDIR "/password-file");
success = s_can_connect (ctx, &server, &client);
assert (success);

zsocket_set_plain_server (server, 1);
zsocket_set_plain_username (client, "admin");
zsocket_set_plain_password (client, "Bogus");
success = s_can_connect (ctx, &server, &client);
assert (!success);

if (zsys_has_curve ()) {
    //  Try CURVE authentication
    //  We'll create two new certificates and save the client public
    //  certificate on disk; in a real case we'd transfer this securely
    //  from the client machine to the server machine.
    zcert_t *server_cert = zcert_new ();
    assert (server_cert);
    zcert_t *client_cert = zcert_new ();
    assert (client_cert);
    char *server_key = zcert_public_txt (server_cert);

    //  Test without setting-up any authentication
    zcert_apply (server_cert, server);
    zcert_apply (client_cert, client);
    zsocket_set_curve_server (server, 1);
    zsocket_set_curve_serverkey (client, server_key);
    success = s_can_connect (ctx, &server, &client);
    assert (!success);

    //  Test CURVE_ALLOW_ANY
    zcert_apply (server_cert, server);
    zcert_apply (client_cert, client);
    zsocket_set_curve_server (server, 1);
    zsocket_set_curve_serverkey (client, server_key);
    zauth_configure_curve (auth, "*", CURVE_ALLOW_ANY);
    success = s_can_connect (ctx, &server, &client);
    assert (success);

    //  Test full client authentication using certificates
    zcert_apply (server_cert, server);
    zcert_apply (client_cert, client);
    zsocket_set_curve_server (server, 1);
    zsocket_set_curve_serverkey (client, server_key);
    zcert_save_public (client_cert, TESTDIR "/mycert.txt");
    zauth_configure_curve (auth, "*", TESTDIR);
    success = s_can_connect (ctx, &server, &client);
    assert (success);

    zcert_destroy (&server_cert);
    zcert_destroy (&client_cert);
}
//  Remove the authenticator and check a normal connection works
zauth_destroy (&auth);
success = s_can_connect (ctx, &server, &client);
assert (success);

zctx_destroy (&ctx);

//  Delete all test files
zdir_t *dir = zdir_new (TESTDIR, NULL);
assert (dir);
zdir_remove (dir, true);
zdir_destroy (&dir);

AUTHORS

The czmq manual was written by the authors in the AUTHORS file.

RESOURCES

Main web site: m[blue]m[]

Report bugs to the email <m[blue]zeromq-dev [at] lists.zeromq.orgm[][1]>

COPYRIGHT

Copyright (c) 1991-2012 iMatix Corporation -- http://www.imatix.com Copyright other contributors as noted in the AUTHORS file. This file is part of CZMQ, the high-level C binding for 0MQ: http://czmq.zeromq.org This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0. If a copy of the MPL was not distributed with this file, You can obtain one at http://mozilla.org/MPL/2.0/. LICENSE included with the czmq distribution.

NOTES

1.

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