appl/test/http_client.c

   1 /*
   2  * Copyright (c) 2003 - 2005 Kungliga Tekniska Högskolan
   3  * (Royal Institute of Technology, Stockholm, Sweden).
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  *
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  *
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * 3. Neither the name of the Institute nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #include "test_locl.h"
  35 #include <gssapi/gssapi.h>
  36 #include <gssapi/gssapi_krb5.h>
  37 #include <gssapi/gssapi_spnego.h>
  38 #include "gss_common.h"
  39 #include <base64.h>
  40
  41 RCSID("$Id$");
  42
  43 /*
  44  * A simplistic client implementing draft-brezak-spnego-http-04.txt
  45  */
  46
  47 static int
  48 do_connect (const char *hostname, const char *port)
  49 {
  50     struct addrinfo *ai, *a;
  51     struct addrinfo hints;
  52     int error;
  53     int s = -1;
  54
  55     memset (&hints, 0, sizeof(hints));
  56     hints.ai_family = PF_UNSPEC;
  57     hints.ai_socktype = SOCK_STREAM;
  58     hints.ai_protocol = 0;
  59
  60     error = getaddrinfo (hostname, port, &hints, &ai);
  61     if (error)
  62         errx (1, "getaddrinfo(%s): %s", hostname, gai_strerror(error));
  63
  64     for (a = ai; a != NULL; a = a->ai_next) {
  65         s = socket (a->ai_family, a->ai_socktype, a->ai_protocol);
  66         if (s < 0)
  67             continue;
  68         if (connect (s, a->ai_addr, a->ai_addrlen) < 0) {
  69             warn ("connect(%s)", hostname);
  70             close (s);
  71             continue;
  72         }
  73         break;
  74     }
  75     freeaddrinfo (ai);
  76     if (a == NULL)
  77         errx (1, "failed to contact %s", hostname);
  78
  79     return s;
  80 }
  81
  82 static void
  83 fdprintf(int s, const char *fmt, ...)
  84 {
  85     size_t len;
  86     ssize_t ret;
  87     va_list ap;
  88     char *str, *buf;
  89
  90     va_start(ap, fmt);
  91     vasprintf(&str, fmt, ap);
  92     va_end(ap);
  93
  94     if (str == NULL)
  95         errx(1, "vasprintf");
  96
  97     buf = str;
  98     len = strlen(buf);
  99     while (len) {
 100         ret = write(s, buf, len);
 101         if (ret == 0)
 102             err(1, "connection closed");
 103         else if (ret < 0)
 104             err(1, "error");
 105         len -= ret;
 106         buf += ret;
 107     }
 108     free(str);
 109 }
 110
 111 static int help_flag;
 112 static int version_flag;
 113 static int verbose_flag;
 114 static int mutual_flag = 1;
 115 static int delegate_flag;
 116 static char *port_str = "http";
 117 static char *gss_service = "HTTP";
 118
 119 static struct getargs http_args[] = {
 120     { "verbose", 'v', arg_flag, &verbose_flag, "verbose logging", NULL },
 121     { "port", 'p', arg_string, &port_str, "port to connect to", "port" },
 122     { "delegate", 0, arg_flag, &delegate_flag, "gssapi delegate credential",
 123       NULL },
 124     { "gss-service", 's', arg_string, &gss_service, "gssapi service to use",
 125       "service" },
 126     { "mech", 'm', arg_string, &mech, "gssapi mech to use", "mech" },
 127     { "mutual", 0, arg_negative_flag, &mutual_flag, "no gssapi mutual auth",
 128       NULL },
 129     { "help", 'h', arg_flag, &help_flag, NULL, NULL },
 130     { "version", 0, arg_flag, &version_flag, NULL, NULL }
 131 };
 132
 133 static int num_http_args = sizeof(http_args) / sizeof(http_args[0]);
 134
 135 static void
 136 usage(int code)
 137 {
 138     arg_printusage(http_args, num_http_args, NULL, "host [page]");
 139     exit(code);
 140 }
 141
 142 /*
 143  *
 144  */
 145
 146 struct http_req {
 147     char *response;
 148     char **headers;
 149     int num_headers;
 150     void *body;
 151     size_t body_size;
 152 };
 153
 154
 155 static void
 156 http_req_zero(struct http_req *req)
 157 {
 158     req->response = NULL;
 159     req->headers = NULL;
 160     req->num_headers = 0;
 161     req->body = NULL;
 162     req->body_size = 0;
 163 }
 164
 165 static void
 166 http_req_free(struct http_req *req)
 167 {
 168     int i;
 169
 170     free(req->response);
 171     for (i = 0; i < req->num_headers; i++)
 172         free(req->headers[i]);
 173     free(req->headers);
 174     free(req->body);
 175     http_req_zero(req);
 176 }
 177
 178 static const char *
 179 http_find_header(struct http_req *req, const char *header)
 180 {
 181     int i, len = strlen(header);
 182
 183     for (i = 0; i < req->num_headers; i++) {
 184         if (strncasecmp(header, req->headers[i], len) == 0) {
 185             return req->headers[i] + len + 1;
 186         }
 187     }
 188     return NULL;
 189 }
 190
 191
 192 static int
 193 http_query(const char *host, const char *page,
 194            char **headers, struct http_req *req)
 195 {
 196     enum { RESPONSE, HEADER, BODY } state;
 197     ssize_t ret;
 198     char in_buf[1024], *in_ptr = in_buf;
 199     size_t in_len = 0;
 200     int s, i;
 201
 202     http_req_zero(req);
 203
 204     s = do_connect(host, port_str);
 205     if (s < 0)
 206         errx(1, "connection failed");
 207
 208     fdprintf(s, "GET %s HTTP/1.0\r\n", page);
 209     for (i = 0; headers[i]; i++)
 210         fdprintf(s, "%s\r\n", headers[i]);
 211     fdprintf(s, "Host: %s\r\n\r\n", host);
 212
 213     state = RESPONSE;
 214
 215     while (1) {
 216         ret = read (s, in_ptr, sizeof(in_buf) - in_len - 1);
 217         if (ret == 0)
 218             break;
 219         else if (ret < 0)
 220             err (1, "read: %lu", (unsigned long)ret);
 221
 222         in_buf[ret + in_len] = '\0';
 223
 224         if (state == HEADER || state == RESPONSE) {
 225             char *p;
 226
 227             in_len += ret;
 228             in_ptr += ret;
 229
 230             while (1) {
 231                 p = strstr(in_buf, "\r\n");
 232
 233                 if (p == NULL) {
 234                     break;
 235                 } else if (p == in_buf) {
 236                     memmove(in_buf, in_buf + 2, sizeof(in_buf) - 2);
 237                     state = BODY;
 238                     in_len -= 2;
 239                     in_ptr -= 2;
 240                     break;
 241                 } else if (state == RESPONSE) {
 242                     req->response = emalloc(p - in_buf + 1);
 243                     memcpy(req->response, in_buf, p - in_buf);
 244                     req->response[p - in_buf] = '\0';
 245                     state = HEADER;
 246                 } else {
 247                     req->headers = realloc(req->headers,
 248                                            (req->num_headers + 1) * sizeof(req->headers[0]));
 249                     req->headers[req->num_headers] = emalloc(p - in_buf + 1);
 250                     memcpy(req->headers[req->num_headers], in_buf, p - in_buf);
 251                     req->headers[req->num_headers][p - in_buf] = '\0';
 252                     if (req->headers[req->num_headers] == NULL)
 253                         errx(1, "strdup");
 254                     req->num_headers++;
 255                 }
 256                 memmove(in_buf, p + 2, sizeof(in_buf) - (p - in_buf) - 2);
 257                 in_len -= (p - in_buf) + 2;
 258                 in_ptr -= (p - in_buf) + 2;
 259             }
 260         }
 261
 262         if (state == BODY) {
 263
 264             req->body = erealloc(req->body, req->body_size + ret + 1);
 265
 266             memcpy((char *)req->body + req->body_size, in_buf, ret);
 267             req->body_size += ret;
 268             ((char *)req->body)[req->body_size] = '\0';
 269
 270             in_ptr = in_buf;
 271             in_len = 0;
 272         } else
 273             abort();
 274     }
 275
 276     if (verbose_flag) {
 277         int i;
 278         printf("response: %s\n", req->response);
 279         for (i = 0; i < req->num_headers; i++)
 280             printf("header[%d] %s\n", i, req->headers[i]);
 281         printf("body: %.*s\n", (int)req->body_size, (char *)req->body);
 282     }
 283
 284     close(s);
 285     return 0;
 286 }
 287
 288
 289 int
 290 main(int argc, char **argv)
 291 {
 292     struct http_req req;
 293     const char *host, *page;
 294     int i, done, print_body, gssapi_done, gssapi_started;
 295     char *headers[10] = { 0 };
 296     int num_headers = 0;
 297     gss_ctx_id_t context_hdl = GSS_C_NO_CONTEXT;
 298     gss_name_t server = GSS_C_NO_NAME;
 299     int optind = 0;
 300     gss_OID mech_oid;
 301     OM_uint32 flags;
 302
 303     setprogname(argv[0]);
 304
 305     if(getarg(http_args, num_http_args, argc, argv, &optind))
 306         usage(1);
 307
 308     if (help_flag)
 309         usage (0);
 310
 311     if(version_flag) {
 312         print_version(NULL);
 313         exit(0);
 314     }
 315
 316     argc -= optind;
 317     argv += optind;
 318
 319     mech_oid = select_mech(mech);
 320
 321     if (argc != 1 && argc != 2)
 322         errx(1, "usage: %s host [page]", getprogname());
 323     host = argv[0];
 324     if (argc == 2)
 325         page = argv[1];
 326     else
 327         page = "/";
 328
 329     flags = 0;
 330     if (delegate_flag)
 331         flags |= GSS_C_DELEG_FLAG;
 332     if (mutual_flag)
 333         flags |= GSS_C_MUTUAL_FLAG;
 334
 335     done = 0;
 336     num_headers = 0;
 337     gssapi_done = 1;
 338     gssapi_started = 0;
 339     do {
 340         print_body = 0;
 341
 342         http_query(host, page, headers, &req);
 343         for (i = 0 ; headers[i]; i++) {
 344             free(headers[i]);
 345             headers[i] = NULL;
 346         }
 347         num_headers = 0;
 348
 349         if (strstr(req.response, " 200 ") != NULL) {
 350             print_body = 1;
 351             done = 1;
 352         } else if (strstr(req.response, " 401 ") != NULL) {
 353             if (http_find_header(&req, "WWW-Authenticate:") == NULL)
 354                 errx(1, "Got %s but missed `WWW-Authenticate'", req.response);
 355             gssapi_done = 0;
 356         }
 357
 358         if (!gssapi_done) {
 359             const char *h = http_find_header(&req, "WWW-Authenticate:");
 360             if (h == NULL)
 361                 errx(1, "Got %s but missed `WWW-Authenticate'", req.response);
 362
 363             if (strncasecmp(h, "Negotiate", 9) == 0) {
 364                 OM_uint32 maj_stat, min_stat;
 365                 gss_buffer_desc input_token, output_token;
 366
 367                 if (verbose_flag)
 368                     printf("Negotiate found\n");
 369
 370                 if (server == GSS_C_NO_NAME) {
 371                     char *name;
 372                     asprintf(&name, "%s@%s", gss_service, host);
 373                     input_token.length = strlen(name);
 374                     input_token.value = name;
 375
 376                     maj_stat = gss_import_name(&min_stat,
 377                                                &input_token,
 378                                                GSS_C_NT_HOSTBASED_SERVICE,
 379                                                &server);
 380                     if (GSS_ERROR(maj_stat))
 381                         gss_err (1, min_stat, "gss_inport_name");
 382                     free(name);
 383                     input_token.length = 0;
 384                     input_token.value = NULL;
 385                 }
 386
 387                 i = 9;
 388                 while(h[i] && isspace((unsigned char)h[i]))
 389                     i++;
 390                 if (h[i] != '\0') {
 391                     int len = strlen(&h[i]);
 392                     if (len == 0)
 393                         errx(1, "invalid Negotiate token");
 394                     input_token.value = emalloc(len);
 395                     len = rk_base64_decode(&h[i], input_token.value);
 396                     if (len < 0)
 397                         errx(1, "invalid base64 Negotiate token %s", &h[i]);
 398                     input_token.length = len;
 399                 } else {
 400                     if (gssapi_started)
 401                         errx(1, "Negotiate already started");
 402                     gssapi_started = 1;
 403
 404                     input_token.length = 0;
 405                     input_token.value = NULL;
 406                 }
 407
 408                 maj_stat =
 409                     gss_init_sec_context(&min_stat,
 410                                          GSS_C_NO_CREDENTIAL,
 411                                          &context_hdl,
 412                                          server,
 413                                          mech_oid,
 414                                          flags,
 415                                          0,
 416                                          GSS_C_NO_CHANNEL_BINDINGS,
 417                                          &input_token,
 418                                          NULL,
 419                                          &output_token,
 420                                          NULL,
 421                                          NULL);
 422                 if (GSS_ERROR(maj_stat))
 423                     gss_err (1, min_stat, "gss_init_sec_context");
 424                 else if (maj_stat & GSS_S_CONTINUE_NEEDED)
 425                     gssapi_done = 0;
 426                 else {
 427                     gss_name_t targ_name, src_name;
 428                     gss_buffer_desc name_buffer;
 429                     gss_OID mech_type;
 430
 431                     gssapi_done = 1;
 432
 433                     printf("Negotiate done: %s\n", mech);
 434
 435                     maj_stat = gss_inquire_context(&min_stat,
 436                                                    context_hdl,
 437                                                    &src_name,
 438                                                    &targ_name,
 439                                                    NULL,
 440                                                    &mech_type,
 441                                                    NULL,
 442                                                    NULL,
 443                                                    NULL);
 444                     if (GSS_ERROR(maj_stat))
 445                         gss_err (1, min_stat, "gss_inquire_context");
 446
 447                     maj_stat = gss_display_name(&min_stat,
 448                                                 src_name,
 449                                                 &name_buffer,
 450                                                 NULL);
 451                     if (GSS_ERROR(maj_stat))
 452                         gss_err (1, min_stat, "gss_display_name");
 453
 454                     printf("Source: %.*s\n",
 455                            (int)name_buffer.length,
 456                            (char *)name_buffer.value);
 457
 458                     gss_release_buffer(&min_stat, &name_buffer);
 459
 460                     maj_stat = gss_display_name(&min_stat,
 461                                                 targ_name,
 462                                                 &name_buffer,
 463                                                 NULL);
 464                     if (GSS_ERROR(maj_stat))
 465                         gss_err (1, min_stat, "gss_display_name");
 466
 467                     printf("Target: %.*s\n",
 468                            (int)name_buffer.length,
 469                            (char *)name_buffer.value);
 470
 471                     gss_release_name(&min_stat, &targ_name);
 472                     gss_release_buffer(&min_stat, &name_buffer);
 473                 }
 474
 475                 if (output_token.length) {
 476                     char *neg_token;
 477
 478                     rk_base64_encode(output_token.value,
 479                                      output_token.length,
 480                                      &neg_token);
 481
 482                     asprintf(&headers[num_headers++], "Authorization: Negotiate %s",
 483                              neg_token);
 484
 485                     free(neg_token);
 486                     gss_release_buffer(&min_stat, &output_token);
 487                 }
 488                 if (input_token.length)
 489                     free(input_token.value);
 490
 491             } else
 492                 done = 1;
 493         } else
 494             done = 1;
 495
 496         if (verbose_flag) {
 497             printf("%s\n\n", req.response);
 498
 499             for (i = 0; i < req.num_headers; i++)
 500                 printf("%s\n", req.headers[i]);
 501             printf("\n");
 502         }
 503         if (print_body || verbose_flag)
 504             printf("%.*s\n", (int)req.body_size, (char *)req.body);
 505
 506         http_req_free(&req);
 507     } while (!done);
 508
 509     if (gssapi_done == 0)
 510         errx(1, "gssapi not done but http dance done");
 511
 512     return 0;
 513 }