402 lines
11 KiB
C
402 lines
11 KiB
C
/*
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* Copyright (c) 1997 - 2000 Kungliga Tekniska Högskolan
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* (Royal Institute of Technology, Stockholm, Sweden).
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* A sample server that uses the GSSAPI.
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*/
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#include "test_locl.h"
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#include <gssapi/gssapi.h>
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#include <gssapi/gssapi_krb5.h>
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#include <gssapi/gssapi_spnego.h>
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#include "gss_common.h"
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static int
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process_it(int sock,
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gss_ctx_id_t context_hdl,
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gss_name_t client_name
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)
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{
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OM_uint32 maj_stat, min_stat;
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gss_buffer_desc real_input_token, real_output_token;
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gss_buffer_t input_token = &real_input_token,
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output_token = &real_output_token;
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gss_name_t server_name;
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int conf_flag;
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print_gss_name("User is", client_name);
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maj_stat = gss_inquire_context(&min_stat,
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context_hdl,
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NULL,
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&server_name,
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NULL,
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NULL,
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NULL,
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NULL,
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NULL);
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if (GSS_ERROR(maj_stat))
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gss_err (1, min_stat, "gss_inquire_context");
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print_gss_name("Server is", server_name);
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maj_stat = gss_release_name(&min_stat, &server_name);
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if (GSS_ERROR(maj_stat))
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gss_err (1, min_stat, "gss_release_name");
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/* gss_verify_mic */
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read_token (sock, input_token);
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read_token (sock, output_token);
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maj_stat = gss_verify_mic (&min_stat,
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context_hdl,
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input_token,
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output_token,
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NULL);
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if (GSS_ERROR(maj_stat))
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gss_err (1, min_stat, "gss_verify_mic");
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fprintf (stderr, "gss_verify_mic: %.*s\n", (int)input_token->length,
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(char *)input_token->value);
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gss_release_buffer (&min_stat, input_token);
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gss_release_buffer (&min_stat, output_token);
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/* create mic */
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input_token->length = 6;
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input_token->value = strdup("hejsan");
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maj_stat = gss_get_mic(&min_stat,
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context_hdl,
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GSS_C_QOP_DEFAULT,
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input_token,
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output_token);
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if (GSS_ERROR(maj_stat))
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gss_err (1, min_stat, "gss_get_mic");
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write_token (sock, input_token);
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write_token (sock, output_token);
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gss_release_buffer (&min_stat, output_token);
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/* gss_unwrap */
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read_token (sock, input_token);
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maj_stat = gss_unwrap (&min_stat,
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context_hdl,
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input_token,
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output_token,
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&conf_flag,
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NULL);
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if(GSS_ERROR(maj_stat))
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gss_err (1, min_stat, "gss_unwrap");
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fprintf (stderr, "gss_unwrap: %.*s %s\n", (int)output_token->length,
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(char *)output_token->value,
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conf_flag ? "CONF" : "INT");
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gss_release_buffer (&min_stat, input_token);
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gss_release_buffer (&min_stat, output_token);
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read_token (sock, input_token);
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maj_stat = gss_unwrap (&min_stat,
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context_hdl,
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input_token,
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output_token,
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&conf_flag,
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NULL);
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if(GSS_ERROR(maj_stat))
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gss_err (1, min_stat, "gss_unwrap");
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fprintf (stderr, "gss_unwrap: %.*s %s\n", (int)output_token->length,
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(char *)output_token->value,
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conf_flag ? "CONF" : "INT");
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gss_release_buffer (&min_stat, input_token);
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gss_release_buffer (&min_stat, output_token);
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input_token->value = "hejhej";
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input_token->length = 6;
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maj_stat = gss_wrap (&min_stat,
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context_hdl,
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1,
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GSS_C_QOP_DEFAULT,
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input_token,
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NULL,
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output_token);
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if (GSS_ERROR(maj_stat))
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gss_err(1, min_stat, "gss_wrap");
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write_token (sock, output_token);
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gss_release_buffer (&min_stat, output_token);
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read_token (sock, input_token);
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if (input_token->length != 6 && memcmp(input_token->value, "hejhej", 6) != 0)
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errx(1, "invalid reply");
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return 0;
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}
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static int
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proto (int sock, const char *service)
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{
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struct sockaddr_in remote, local;
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socklen_t addrlen;
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gss_ctx_id_t context_hdl = GSS_C_NO_CONTEXT;
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gss_buffer_desc real_input_token, real_output_token;
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gss_buffer_t input_token = &real_input_token,
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output_token = &real_output_token;
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OM_uint32 maj_stat, min_stat;
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gss_name_t client_name;
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struct gss_channel_bindings_struct input_chan_bindings;
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gss_cred_id_t delegated_cred_handle = NULL;
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krb5_ccache ccache = NULL;
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u_char init_buf[4];
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u_char acct_buf[4];
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gss_OID mech_oid;
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char *mech, *p;
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addrlen = sizeof(local);
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if (getsockname (sock, (struct sockaddr *)&local, &addrlen) < 0
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|| addrlen != sizeof(local))
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err (1, "getsockname)");
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addrlen = sizeof(remote);
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if (getpeername (sock, (struct sockaddr *)&remote, &addrlen) < 0
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|| addrlen != sizeof(remote))
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err (1, "getpeername");
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input_chan_bindings.initiator_addrtype = GSS_C_AF_INET;
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input_chan_bindings.initiator_address.length = 4;
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init_buf[0] = (remote.sin_addr.s_addr >> 24) & 0xFF;
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init_buf[1] = (remote.sin_addr.s_addr >> 16) & 0xFF;
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init_buf[2] = (remote.sin_addr.s_addr >> 8) & 0xFF;
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init_buf[3] = (remote.sin_addr.s_addr >> 0) & 0xFF;
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input_chan_bindings.initiator_address.value = init_buf;
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input_chan_bindings.acceptor_addrtype = GSS_C_AF_INET;
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input_chan_bindings.acceptor_address.length = 4;
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acct_buf[0] = (local.sin_addr.s_addr >> 24) & 0xFF;
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acct_buf[1] = (local.sin_addr.s_addr >> 16) & 0xFF;
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acct_buf[2] = (local.sin_addr.s_addr >> 8) & 0xFF;
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acct_buf[3] = (local.sin_addr.s_addr >> 0) & 0xFF;
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input_chan_bindings.acceptor_address.value = acct_buf;
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input_chan_bindings.application_data.value = emalloc(4);
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#if 0
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* (unsigned short *)input_chan_bindings.application_data.value =
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remote.sin_port;
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* ((unsigned short *)input_chan_bindings.application_data.value + 1) =
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local.sin_port;
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input_chan_bindings.application_data.length = 4;
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#else
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input_chan_bindings.application_data.length = 0;
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input_chan_bindings.application_data.value = NULL;
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#endif
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delegated_cred_handle = GSS_C_NO_CREDENTIAL;
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do {
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read_token (sock, input_token);
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maj_stat =
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gss_accept_sec_context (&min_stat,
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&context_hdl,
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GSS_C_NO_CREDENTIAL,
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input_token,
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&input_chan_bindings,
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&client_name,
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&mech_oid,
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output_token,
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NULL,
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NULL,
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&delegated_cred_handle);
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if(GSS_ERROR(maj_stat))
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gss_err (1, min_stat, "gss_accept_sec_context");
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if (output_token->length != 0)
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write_token (sock, output_token);
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if (GSS_ERROR(maj_stat)) {
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if (context_hdl != GSS_C_NO_CONTEXT)
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gss_delete_sec_context (&min_stat,
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&context_hdl,
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GSS_C_NO_BUFFER);
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break;
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}
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} while(maj_stat & GSS_S_CONTINUE_NEEDED);
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p = (char *)mech_oid->elements;
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if (mech_oid->length == GSS_KRB5_MECHANISM->length
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&& memcmp(p, GSS_KRB5_MECHANISM->elements, mech_oid->length) == 0)
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mech = "Kerberos 5";
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else if (mech_oid->length == GSS_SPNEGO_MECHANISM->length
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&& memcmp(p, GSS_SPNEGO_MECHANISM->elements, mech_oid->length) == 0)
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mech = "SPNEGO"; /* XXX Silly, wont show up */
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else
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mech = "Unknown";
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printf("Using mech: %s\n", mech);
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if (delegated_cred_handle != GSS_C_NO_CREDENTIAL) {
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krb5_context context = NULL;
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printf("Delegated cred found\n");
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min_stat = krb5_init_context(&context);
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if (min_stat)
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gss_err(1, min_stat, "krb5_init_context");
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if (min_stat == 0)
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min_stat = krb5_cc_resolve(context, "FILE:/tmp/krb5cc_test", &ccache);
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if (min_stat == 0)
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maj_stat = gss_krb5_copy_ccache(&min_stat,
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delegated_cred_handle,
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ccache);
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else
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maj_stat = GSS_S_FAILURE;
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if (maj_stat == 0) {
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krb5_principal p;
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maj_stat = krb5_cc_get_principal(context, ccache, &p);
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if (maj_stat == 0) {
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char *name;
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maj_stat = krb5_unparse_name(context, p, &name);
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if (maj_stat == 0) {
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printf("Delegated user is: `%s'\n", name);
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free(name);
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}
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krb5_free_principal(context, p);
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}
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}
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krb5_cc_close(context, ccache);
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krb5_free_context(context);
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gss_release_cred(&min_stat, &delegated_cred_handle);
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}
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if (fork_flag) {
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pid_t pid;
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int pipefd[2];
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if (pipe (pipefd) < 0)
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err (1, "pipe");
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pid = fork ();
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if (pid < 0)
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err (1, "fork");
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if (pid != 0) {
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gss_buffer_desc buf;
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maj_stat = gss_export_sec_context (&min_stat,
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&context_hdl,
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&buf);
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if (GSS_ERROR(maj_stat))
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gss_err (1, min_stat, "gss_export_sec_context");
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write_token (pipefd[1], &buf);
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exit (0);
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} else {
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gss_ctx_id_t context_hdl;
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gss_buffer_desc buf;
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close (pipefd[1]);
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read_token (pipefd[0], &buf);
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close (pipefd[0]);
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maj_stat = gss_import_sec_context (&min_stat, &buf, &context_hdl);
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if (GSS_ERROR(maj_stat))
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gss_err (1, min_stat, "gss_import_sec_context");
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gss_release_buffer (&min_stat, &buf);
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return process_it (sock, context_hdl, client_name);
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}
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} else {
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return process_it (sock, context_hdl, client_name);
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}
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}
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static void
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loop (int port, const char *service)
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{
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int sock, sock2;
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struct sockaddr_in my_addr;
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int one = 1;
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if (keytab_str)
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gsskrb5_register_acceptor_identity(keytab_str);
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sock = socket (AF_INET, SOCK_STREAM, 0);
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if (sock < 0)
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err (1, "socket");
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memset (&my_addr, 0, sizeof(my_addr));
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my_addr.sin_family = AF_INET;
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my_addr.sin_port = port;
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my_addr.sin_addr.s_addr = INADDR_ANY;
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if (setsockopt (sock, SOL_SOCKET, SO_REUSEADDR,
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(void *)&one, sizeof(one)) < 0)
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warn ("setsockopt SO_REUSEADDR");
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if (bind (sock, (struct sockaddr *)&my_addr, sizeof(my_addr)) < 0)
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err (1, "bind");
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while (1) {
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if (listen (sock, 1) < 0)
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err (1, "listen");
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sock2 = accept (sock, NULL, NULL);
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if (sock2 < 0)
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err (1, "accept");
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proto (sock2, service);
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}
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}
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/*
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* Iterative server; process one connection at a time.
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*/
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int
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main(int argc, char **argv)
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{
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krb5_context context = NULL; /* XXX */
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krb5_error_code ret;
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int port = server_setup(&context, argc, argv);
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ret = krb5_kt_have_content(context, keytab);
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if (ret)
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krb5_err (context, 1, ret, "krb5_kt_have_content");
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loop (port, service);
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return 0;
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}
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