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- (djm) Pull in auth-krb5.c from OpenBSD CVS. NB. it is not currently used.
This commit is contained in:
Damien Miller
parent
d4d119377d
commit
964fed54cd
@ -1,3 +1,6 @@
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20010925
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- (djm) Pull in auth-krb5.c from OpenBSD CVS. NB. it is not currently used.
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20010923
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- (bal) updated ssh.c to mirror minor getopts 'extern int' formating done
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by stevesk@
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@ -6563,4 +6566,4 @@
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- Wrote replacements for strlcpy and mkdtemp
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- Released 1.0pre1
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$Id: ChangeLog,v 1.1559 2001/09/24 23:15:15 mouring Exp $
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$Id: ChangeLog,v 1.1560 2001/09/25 02:58:23 djm Exp $
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259
auth-krb5.c
Normal file
259
auth-krb5.c
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@ -0,0 +1,259 @@
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/*
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* Kerberos v5 authentication and ticket-passing routines.
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*
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* $FreeBSD: src/crypto/openssh/auth-krb5.c,v 1.6 2001/02/13 16:58:04 assar Exp $
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* $OpenBSD: auth-krb5.c,v 1.1 2001/06/26 16:15:23 dugsong Exp $
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*/
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#include "includes.h"
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#include "ssh.h"
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#include "ssh1.h"
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#include "packet.h"
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#include "xmalloc.h"
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#include "log.h"
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#include "servconf.h"
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#include "uidswap.h"
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#include "auth.h"
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#ifdef KRB5
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#include <krb5.h>
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extern ServerOptions options;
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static int
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krb5_init(void *context)
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{
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Authctxt *authctxt = (Authctxt *)context;
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krb5_error_code problem;
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static int cleanup_registered = 0;
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if (authctxt->krb5_ctx == NULL) {
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problem = krb5_init_context(&authctxt->krb5_ctx);
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if (problem)
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return (problem);
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krb5_init_ets(authctxt->krb5_ctx);
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}
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if (!cleanup_registered) {
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fatal_add_cleanup(krb5_cleanup_proc, authctxt);
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cleanup_registered = 1;
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}
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return (0);
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}
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/*
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* Try krb5 authentication. server_user is passed for logging purposes
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* only, in auth is received ticket, in client is returned principal
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* from the ticket
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*/
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int
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auth_krb5(Authctxt *authctxt, krb5_data *auth, char **client)
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{
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krb5_error_code problem;
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krb5_principal server;
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krb5_data reply;
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krb5_ticket *ticket;
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int fd;
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server = NULL;
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ticket = NULL;
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reply.length = 0;
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problem = krb5_init(authctxt);
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if (problem)
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goto err;
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problem = krb5_auth_con_init(authctxt->krb5_ctx,
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&authctxt->krb5_auth_ctx);
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if (problem)
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goto err;
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fd = packet_get_connection_in();
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problem = krb5_auth_con_setaddrs_from_fd(authctxt->krb5_ctx,
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authctxt->krb5_auth_ctx, &fd);
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if (problem)
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goto err;
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problem = krb5_sname_to_principal(authctxt->krb5_ctx, NULL, NULL ,
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KRB5_NT_SRV_HST, &server);
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if (problem)
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goto err;
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problem = krb5_rd_req(authctxt->krb5_ctx, &authctxt->krb5_auth_ctx,
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auth, server, NULL, NULL, &ticket);
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if (problem)
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goto err;
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problem = krb5_copy_principal(authctxt->krb5_ctx, ticket->client,
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&authctxt->krb5_user);
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if (problem)
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goto err;
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/* if client wants mutual auth */
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problem = krb5_mk_rep(authctxt->krb5_ctx, authctxt->krb5_auth_ctx,
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&reply);
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if (problem)
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goto err;
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/* Check .k5login authorization now. */
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if (!krb5_kuserok(authctxt->krb5_ctx, authctxt->krb5_user,
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authctxt->pw->pw_name))
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goto err;
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if (client)
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krb5_unparse_name(authctxt->krb5_ctx, authctxt->krb5_user,
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client);
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packet_start(SSH_SMSG_AUTH_KERBEROS_RESPONSE);
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packet_put_string((char *) reply.data, reply.length);
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packet_send();
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packet_write_wait();
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err:
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if (server)
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krb5_free_principal(authctxt->krb5_ctx, server);
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if (ticket)
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krb5_free_ticket(authctxt->krb5_ctx, ticket);
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if (reply.length)
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xfree(reply.data);
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if (problem) {
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debug("Kerberos v5 authentication failed: %s",
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krb5_get_err_text(authctxt->krb5_ctx, problem));
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return (0);
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}
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return (1);
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}
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int
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auth_krb5_tgt(Authctxt *authctxt, krb5_data *tgt)
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{
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krb5_error_code problem;
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krb5_ccache ccache = NULL;
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char *pname;
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if (authctxt->pw == NULL || authctxt->krb5_user == NULL)
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return (0);
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temporarily_use_uid(authctxt->pw);
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problem = krb5_cc_gen_new(authctxt->krb5_ctx, &krb5_fcc_ops, &ccache);
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if (problem)
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goto fail;
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problem = krb5_cc_initialize(authctxt->krb5_ctx, ccache,
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authctxt->krb5_user);
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if (problem)
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goto fail;
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problem = krb5_rd_cred2(authctxt->krb5_ctx, authctxt->krb5_auth_ctx,
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ccache, tgt);
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if (problem)
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goto fail;
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authctxt->krb5_fwd_ccache = ccache;
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ccache = NULL;
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authctxt->krb5_ticket_file = (char *)krb5_cc_get_name(authctxt->krb5_ctx, authctxt->krb5_fwd_ccache);
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problem = krb5_unparse_name(authctxt->krb5_ctx, authctxt->krb5_user,
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&pname);
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if (problem)
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goto fail;
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debug("Kerberos v5 TGT accepted (%s)", pname);
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restore_uid();
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return (1);
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fail:
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if (problem)
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debug("Kerberos v5 TGT passing failed: %s",
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krb5_get_err_text(authctxt->krb5_ctx, problem));
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if (ccache)
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krb5_cc_destroy(authctxt->krb5_ctx, ccache);
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restore_uid();
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return (0);
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}
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int
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auth_krb5_password(Authctxt *authctxt, const char *password)
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{
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krb5_error_code problem;
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if (authctxt->pw == NULL)
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return (0);
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temporarily_use_uid(authctxt->pw);
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problem = krb5_init(authctxt);
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if (problem)
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goto out;
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problem = krb5_parse_name(authctxt->krb5_ctx, authctxt->pw->pw_name,
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&authctxt->krb5_user);
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if (problem)
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goto out;
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problem = krb5_cc_gen_new(authctxt->krb5_ctx, &krb5_mcc_ops,
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&authctxt->krb5_fwd_ccache);
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if (problem)
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goto out;
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problem = krb5_cc_initialize(authctxt->krb5_ctx,
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authctxt->krb5_fwd_ccache, authctxt->krb5_user);
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if (problem)
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goto out;
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problem = krb5_verify_user(authctxt->krb5_ctx, authctxt->krb5_user,
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authctxt->krb5_fwd_ccache, password, 1, NULL);
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if (problem)
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goto out;
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authctxt->krb5_ticket_file = (char *)krb5_cc_get_name(authctxt->krb5_ctx, authctxt->krb5_fwd_ccache);
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out:
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restore_uid();
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if (problem) {
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debug("Kerberos password authentication failed: %s",
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krb5_get_err_text(authctxt->krb5_ctx, problem));
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krb5_cleanup_proc(authctxt);
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if (options.kerberos_or_local_passwd)
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return (-1);
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else
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return (0);
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}
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return (1);
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}
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void
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krb5_cleanup_proc(void *context)
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{
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Authctxt *authctxt = (Authctxt *)context;
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debug("krb5_cleanup_proc called");
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if (authctxt->krb5_fwd_ccache) {
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krb5_cc_destroy(authctxt->krb5_ctx, authctxt->krb5_fwd_ccache);
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authctxt->krb5_fwd_ccache = NULL;
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}
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if (authctxt->krb5_user) {
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krb5_free_principal(authctxt->krb5_ctx, authctxt->krb5_user);
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authctxt->krb5_user = NULL;
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}
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if (authctxt->krb5_auth_ctx) {
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krb5_auth_con_free(authctxt->krb5_ctx,
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authctxt->krb5_auth_ctx);
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authctxt->krb5_auth_ctx = NULL;
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}
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if (authctxt->krb5_ctx) {
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krb5_free_context(authctxt->krb5_ctx);
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authctxt->krb5_ctx = NULL;
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}
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}
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#endif /* KRB5 */
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