tools/cachemgr.cc

   1 /*
   2  * $Id: cachemgr.cc,v 1.6 2007/12/14 23:11:53 amosjeffries Exp $
   3  *
   4  * DEBUG: section 0     CGI Cache Manager
   5  * AUTHOR: Duane Wessels
   6  *
   7  * SQUID Web Proxy Cache          http://www.squid-cache.org/
   8  * ----------------------------------------------------------
   9  *
  10  *  Squid is the result of efforts by numerous individuals from
  11  *  the Internet community; see the CONTRIBUTORS file for full
  12  *  details.   Many organizations have provided support for Squid's
  13  *  development; see the SPONSORS file for full details.  Squid is
  14  *  Copyrighted (C) 2001 by the Regents of the University of
  15  *  California; see the COPYRIGHT file for full details.  Squid
  16  *  incorporates software developed and/or copyrighted by other
  17  *  sources; see the CREDITS file for full details.
  18  *
  19  *  This program is free software; you can redistribute it and/or modify
  20  *  it under the terms of the GNU General Public License as published by
  21  *  the Free Software Foundation; either version 2 of the License, or
  22  *  (at your option) any later version.
  23  *
  24  *  This program is distributed in the hope that it will be useful,
  25  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  26  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  27  *  GNU General Public License for more details.
  28  *
  29  *  You should have received a copy of the GNU General Public License
  30  *  along with this program; if not, write to the Free Software
  31  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
  32  *
  33  */
  34
  35 #include "config.h"
  36
  37 #if HAVE_UNISTD_H
  38 #include <unistd.h>
  39 #endif
  40 #if HAVE_STDLIB_H
  41 #include <stdlib.h>
  42 #endif
  43 #if HAVE_STDIO_H
  44 #include <stdio.h>
  45 #endif
  46 #if HAVE_SYS_TYPES_H
  47 #include <sys/types.h>
  48 #endif
  49 #if HAVE_CTYPE_H
  50 #include <ctype.h>
  51 #endif
  52 #if HAVE_ERRNO_H
  53 #include <errno.h>
  54 #endif
  55 #if HAVE_FCNTL_H
  56 #include <fcntl.h>
  57 #endif
  58 #if HAVE_GRP_H
  59 #include <grp.h>
  60 #endif
  61 #if HAVE_GNUMALLOC_H
  62 #include <gnumalloc.h>
  63 #elif HAVE_MALLOC_H
  64 #include <malloc.h>
  65 #endif
  66 #if HAVE_MEMORY_H
  67 #include <memory.h>
  68 #endif
  69 #if HAVE_NETDB_H && !defined(_SQUID_NETDB_H_)   /* protect NEXTSTEP */
  70 #define _SQUID_NETDB_H_
  71 #include <netdb.h>
  72 #endif
  73 #if HAVE_PWD_H
  74 #include <pwd.h>
  75 #endif
  76 #if HAVE_SIGNAL_H
  77 #include <signal.h>
  78 #endif
  79 #if HAVE_TIME_H
  80 #include <time.h>
  81 #endif
  82 #if HAVE_SYS_PARAM_H
  83 #include <sys/param.h>
  84 #endif
  85 #if HAVE_SYS_TIME_H
  86 #include <sys/time.h>
  87 #endif
  88 #if HAVE_SYS_RESOURCE_H
  89 #include <sys/resource.h>       /* needs sys/time.h above it */
  90 #endif
  91 #if HAVE_SYS_SOCKET_H
  92 #include <sys/socket.h>
  93 #endif
  94 #if HAVE_NETINET_IN_H
  95 #include <netinet/in.h>
  96 #endif
  97 #if HAVE_ARPA_INET_H
  98 #include <arpa/inet.h>
  99 #endif
 100 #if HAVE_SYS_STAT_H
 101 #include <sys/stat.h>
 102 #endif
 103 #if HAVE_SYS_UN_H
 104 #include <sys/un.h>
 105 #endif
 106 #if HAVE_SYS_WAIT_H
 107 #include <sys/wait.h>
 108 #endif
 109 #if HAVE_LIBC_H
 110 #include <libc.h>
 111 #endif
 112 #if HAVE_STRING_H
 113 #include <string.h>
 114 #endif
 115 #if HAVE_STRINGS_H
 116 #include <strings.h>
 117 #endif
 118 #if HAVE_BSTRING_H
 119 #include <bstring.h>
 120 #endif
 121 #if HAVE_CRYPT_H
 122 #include <crypt.h>
 123 #endif
 124 #if HAVE_SYS_SELECT_H
 125 #include <sys/select.h>
 126 #endif
 127 #if HAVE_FNMATCH_H
 128 extern "C"
 129 {
 130 #include <fnmatch.h>
 131 }
 132 #endif
 133
 134 #include "assert.h"
 135 #include "util.h"
 136 #include "IPAddress.h"
 137 #include "getfullhostname.h"
 138
 139 #ifndef DEFAULT_CACHEMGR_CONFIG
 140 #define DEFAULT_CACHEMGR_CONFIG "/etc/squid/cachemgr.conf"
 141 #endif
 142
 143 typedef struct
 144 {
 145     char *server;
 146     char *hostname;
 147     int port;
 148     char *action;
 149     char *user_name;
 150     char *passwd;
 151     char *pub_auth;
 152 } cachemgr_request;
 153
 154 /*
 155  * Debugging macros (info goes to error_log on your web server)
 156  * Note: do not run cache manager with non zero debugging level
 157  *       if you do not debug, it may write a lot of [sensitive]
 158  *       information to your error log.
 159  */
 160
 161 /* debugging level 0 (disabled) - 3 (max) */
 162 #define DEBUG_LEVEL 0
 163 #define debug(level) if ((level) <= DEBUG_LEVEL && DEBUG_LEVEL > 0)
 164
 165 /*
 166  * Static variables and constants
 167  */
 168 static const time_t passwd_ttl = 60 * 60 * 3;   /* in sec */
 169 static const char *script_name = "/cgi-bin/cachemgr.cgi";
 170 static const char *progname = NULL;
 171 static time_t now;
 172
 173 /*
 174  * Function prototypes
 175  */
 176 #define safe_free(str) { if (str) { xfree(str); (str) = NULL; } }
 177 static const char *safe_str(const char *str);
 178 static const char *xstrtok(char **str, char del);
 179 static void print_trailer(void);
 180 static void auth_html(const char *host, int port, const char *user_name);
 181 static void error_html(const char *msg);
 182 static char *menu_url(cachemgr_request * req, const char *action);
 183 static int parse_status_line(const char *sline, const char **statusStr);
 184 static cachemgr_request *read_request(void);
 185 static char *read_get_request(void);
 186 static char *read_post_request(void);
 187
 188 static void make_pub_auth(cachemgr_request * req);
 189 static void decode_pub_auth(cachemgr_request * req);
 190 static void reset_auth(cachemgr_request * req);
 191 static const char *make_auth_header(const cachemgr_request * req);
 192
 193 static int check_target_acl(const char *hostname, int port);
 194
 195 #ifdef _SQUID_MSWIN_
 196 static int s_iInitCount = 0;
 197
 198 int Win32SockInit(void)
 199 {
 200     int iVersionRequested;
 201     WSADATA wsaData;
 202     int err;
 203
 204     if (s_iInitCount > 0) {
 205         s_iInitCount++;
 206         return (0);
 207     } else if (s_iInitCount < 0)
 208         return (s_iInitCount);
 209
 210     /* s_iInitCount == 0. Do the initailization */
 211     iVersionRequested = MAKEWORD(2, 0);
 212
 213     err = WSAStartup((WORD) iVersionRequested, &wsaData);
 214
 215     if (err) {
 216         s_iInitCount = -1;
 217         return (s_iInitCount);
 218     }
 219
 220     if (LOBYTE(wsaData.wVersion) != 2 ||
 221             HIBYTE(wsaData.wVersion) != 0) {
 222         s_iInitCount = -2;
 223         WSACleanup();
 224         return (s_iInitCount);
 225     }
 226
 227     s_iInitCount++;
 228     return (s_iInitCount);
 229 }
 230
 231 void Win32SockCleanup(void)
 232 {
 233     if (--s_iInitCount == 0)
 234         WSACleanup();
 235
 236     return;
 237 }
 238
 239 #endif /* ifdef _SQUID_MSWIN_ */
 240
 241 static const char *
 242 safe_str(const char *str)
 243 {
 244     return str ? str : "";
 245 }
 246
 247 /* relaxed number format */
 248 static int
 249 is_number(const char *str)
 250 {
 251     return strspn(str, "\t -+01234567890./\n") == strlen(str);
 252 }
 253
 254 static const char *
 255 xstrtok(char **str, char del)
 256 {
 257     if (*str) {
 258         char *p = strchr(*str, del);
 259         char *tok = *str;
 260         int len;
 261
 262         if (p) {
 263             *str = p + 1;
 264             *p = '\0';
 265         } else
 266             *str = NULL;
 267
 268         /* trim */
 269         len = strlen(tok);
 270
 271         while (len && xisspace(tok[len - 1]))
 272             tok[--len] = '\0';
 273
 274         while (xisspace(*tok))
 275             tok++;
 276
 277         return tok;
 278     } else
 279         return "";
 280 }
 281
 282 static void
 283 print_trailer(void)
 284 {
 285     printf("<HR noshade size=\"1px\">\n");
 286     printf("<ADDRESS>\n");
 287     printf("Generated %s, by %s/%s@%s\n",
 288            mkrfc1123(now), progname, VERSION, getfullhostname());
 289     printf("</ADDRESS></BODY></HTML>\n");
 290 }
 291
 292 static void
 293 auth_html(const char *host, int port, const char *user_name)
 294 {
 295     FILE *fp;
 296     int need_host = 1;
 297
 298     if (!user_name)
 299         user_name = "";
 300
 301     if (!host || !strlen(host))
 302         host = "";
 303
 304     printf("Content-Type: text/html\r\n\r\n");
 305
 306     printf("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\" \"http://www.w3.org/TR/html4/loose.dtd\">\n");
 307
 308     printf("<HTML><HEAD><TITLE>Cache Manager Interface</TITLE>\n");
 309
 310     printf("<STYLE type=\"text/css\"><!--BODY{background-color:#ffffff;font-family:verdana,sans-serif}--></STYLE></HEAD>\n");
 311
 312     printf("<BODY><H1>Cache Manager Interface</H1>\n");
 313
 314     printf("<P>This is a WWW interface to the instrumentation interface\n");
 315
 316     printf("for the Squid object cache.</P>\n");
 317
 318     printf("<HR noshade size=\"1px\">\n");
 319
 320     printf("<FORM METHOD=\"POST\" ACTION=\"%s\">\n", script_name);
 321
 322     printf("<TABLE BORDER=\"0\" CELLPADDING=\"10\" CELLSPACING=\"1\">\n");
 323
 324
 325     fp = fopen("cachemgr.conf", "r");
 326
 327     if (fp == NULL)
 328         fp = fopen(DEFAULT_CACHEMGR_CONFIG, "r");
 329
 330     if (fp != NULL) {
 331         int servers = 0;
 332         char config_line[BUFSIZ];
 333
 334         while (fgets(config_line, BUFSIZ, fp)) {
 335             char *server, *comment;
 336             strtok(config_line, "\r\n");
 337
 338             if (config_line[0] == '#')
 339                 continue;
 340
 341             if (config_line[0] == '\0')
 342                 continue;
 343
 344             if ((server = strtok(config_line, " \t")) == NULL)
 345                 continue;
 346
 347             if (strchr(server, '*') || strchr(server, '[') || strchr(server, '?')) {
 348                 need_host = -1;
 349                 continue;
 350             }
 351
 352             comment = strtok(NULL, "");
 353
 354             if (comment)
 355                 while (*comment == ' ' || *comment == '\t')
 356                     comment++;
 357
 358             if (!comment || !*comment)
 359                 comment = server;
 360
 361             if (!servers) {
 362                 printf("<TR><TH ALIGN=\"left\">Cache Server:</TH><TD><SELECT NAME=\"server\">\n");
 363             }
 364
 365             printf("<OPTION VALUE=\"%s\"%s>%s</OPTION>\n", server, (servers || *host) ? "" : " SELECTED", comment);
 366             servers++;
 367         }
 368
 369         if (servers) {
 370             if (need_host == 1 && !*host)
 371                 need_host = 0;
 372
 373             if (need_host)
 374                 printf("<OPTION VALUE=\"\"%s>Other</OPTION>\n", (*host) ? " SELECTED" : "");
 375
 376             printf("</SELECT></TR>\n");
 377         }
 378
 379         fclose(fp);
 380     }
 381
 382     if (need_host) {
 383         if (need_host == 1 && !*host)
 384             host = "localhost";
 385
 386         printf("<TR><TH ALIGN=\"left\">Cache Host:</TH><TD><INPUT NAME=\"host\" ");
 387
 388         printf("size=\"30\" VALUE=\"%s\"></TD></TR>\n", host);
 389
 390         printf("<TR><TH ALIGN=\"left\">Cache Port:</TH><TD><INPUT NAME=\"port\" ");
 391
 392         printf("size=\"30\" VALUE=\"%d\"></TD></TR>\n", port);
 393     }
 394
 395     printf("<TR><TH ALIGN=\"left\">Manager name:</TH><TD><INPUT NAME=\"user_name\" ");
 396
 397     printf("size=\"30\" VALUE=\"%s\"></TD></TR>\n", user_name);
 398
 399     printf("<TR><TH ALIGN=\"left\">Password:</TH><TD><INPUT TYPE=\"password\" NAME=\"passwd\" ");
 400
 401     printf("size=\"30\" VALUE=\"\"></TD></TR>\n");
 402
 403     printf("</TABLE><BR CLEAR=\"all\">\n");
 404
 405     printf("<INPUT TYPE=\"submit\" VALUE=\"Continue...\">\n");
 406
 407     printf("</FORM>\n");
 408
 409     print_trailer();
 410 }
 411
 412 static void
 413 error_html(const char *msg)
 414 {
 415     printf("Content-Type: text/html\r\n\r\n");
 416     printf("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\" \"http://www.w3.org/TR/html4/loose.dtd\">\n");
 417     printf("<HTML><HEAD><TITLE>Cache Manager Error</TITLE>\n");
 418     printf("<STYLE type=\"text/css\"><!--BODY{background-color:#ffffff;font-family:verdana,sans-serif}--></STYLE></HEAD>\n");
 419     printf("<BODY><H1>Cache Manager Error</H1>\n");
 420     printf("<P>\n%s</P>\n", html_quote(msg));
 421     print_trailer();
 422 }
 423
 424 /* returns http status extracted from status line or -1 on parsing failure */
 425 static int
 426 parse_status_line(const char *sline, const char **statusStr)
 427 {
 428     const char *sp = strchr(sline, ' ');
 429
 430     if (statusStr)
 431         *statusStr = NULL;
 432
 433     if (strncasecmp(sline, "HTTP/", 5) || !sp)
 434         return -1;
 435
 436     while (xisspace(*++sp));
 437     if (!xisdigit(*sp))
 438         return -1;
 439
 440     if (statusStr)
 441         *statusStr = sp;
 442
 443     return atoi(sp);
 444 }
 445
 446 static char *
 447 menu_url(cachemgr_request * req, const char *action)
 448 {
 449     static char url[1024];
 450     snprintf(url, sizeof(url), "%s?host=%s&port=%d&user_name=%s&operation=%s&auth=%s",
 451              script_name,
 452              req->hostname,
 453              req->port,
 454              safe_str(req->user_name),
 455              action,
 456              safe_str(req->pub_auth));
 457     return url;
 458 }
 459
 460 static const char *
 461 munge_menu_line(const char *buf, cachemgr_request * req)
 462 {
 463     char *x;
 464     const char *a;
 465     const char *d;
 466     const char *p;
 467     char *a_url;
 468     char *buf_copy;
 469     static char html[2 * 1024];
 470
 471     if (strlen(buf) < 1)
 472         return buf;
 473
 474     if (*buf != ' ')
 475         return buf;
 476
 477     buf_copy = x = xstrdup(buf);
 478
 479     a = xstrtok(&x, '\t');
 480
 481     d = xstrtok(&x, '\t');
 482
 483     p = xstrtok(&x, '\t');
 484
 485     a_url = xstrdup(menu_url(req, a));
 486
 487     /* no reason to give a url for a disabled action */
 488     if (!strcmp(p, "disabled"))
 489         snprintf(html, sizeof(html), "<LI type=\"circle\">%s (disabled)<A HREF=\"%s\">.</A>\n", d, a_url);
 490     else
 491         /* disable a hidden action (requires a password, but password is not in squid.conf) */
 492         if (!strcmp(p, "hidden"))
 493             snprintf(html, sizeof(html), "<LI type=\"circle\">%s (hidden)<A HREF=\"%s\">.</A>\n", d, a_url);
 494         else
 495             /* disable link if authentication is required and we have no password */
 496             if (!strcmp(p, "protected") && !req->passwd)
 497                 snprintf(html, sizeof(html), "<LI type=\"circle\">%s (requires <a href=\"%s\">authentication</a>)<A HREF=\"%s\">.</A>\n",
 498                          d, menu_url(req, "authenticate"), a_url);
 499             else
 500                 /* highlight protected but probably available entries */
 501                 if (!strcmp(p, "protected"))
 502                     snprintf(html, sizeof(html), "<LI type=\"square\"><A HREF=\"%s\"><font color=\"#FF0000\">%s</font></A>\n",
 503                              a_url, d);
 504
 505     /* public entry or unknown type of protection */
 506                 else
 507                     snprintf(html, sizeof(html), "<LI type=\"disk\"><A HREF=\"%s\">%s</A>\n", a_url, d);
 508
 509     xfree(a_url);
 510
 511     xfree(buf_copy);
 512
 513     return html;
 514 }
 515
 516 static const char *
 517 munge_other_line(const char *buf, cachemgr_request * req)
 518 {
 519     static const char *ttags[] = {"td", "th"};
 520
 521     static char html[4096];
 522     static int table_line_num = 0;
 523     static int next_is_header = 0;
 524     int is_header = 0;
 525     const char *ttag;
 526     char *buf_copy;
 527     char *x, *p;
 528     int l = 0;
 529     /* does it look like a table? */
 530
 531     if (!strchr(buf, '\t') || *buf == '\t') {
 532         /* nope, just text */
 533         snprintf(html, sizeof(html), "%s%s",
 534                  table_line_num ? "</table>\n<pre>" : "", html_quote(buf));
 535         table_line_num = 0;
 536         return html;
 537     }
 538
 539     /* start html table */
 540     if (!table_line_num) {
 541         l += snprintf(html + l, sizeof(html) - l, "</pre><table cellpadding=\"2\" cellspacing=\"1\">\n");
 542         next_is_header = 0;
 543     }
 544
 545     /* remove '\n' */
 546     is_header = (!table_line_num || next_is_header) && !strchr(buf, ':') && !is_number(buf);
 547
 548     ttag = ttags[is_header];
 549
 550     /* record starts */
 551     l += snprintf(html + l, sizeof(html) - l, "<tr>");
 552
 553     /* substitute '\t' */
 554     buf_copy = x = xstrdup(buf);
 555
 556     if ((p = strchr(x, '\n')))
 557         *p = '\0';
 558
 559     while (x && strlen(x)) {
 560         int column_span = 1;
 561         const char *cell = xstrtok(&x, '\t');
 562
 563         while (x && *x == '\t') {
 564             column_span++;
 565             x++;
 566         }
 567
 568         l += snprintf(html + l, sizeof(html) - l, "<%s colspan=\"%d\" align=\"%s\">%s</%s>",
 569                       ttag, column_span,
 570                       is_header ? "center" : is_number(cell) ? "right" : "left",
 571                       html_quote(cell), ttag);
 572     }
 573
 574     xfree(buf_copy);
 575     /* record ends */
 576     l += snprintf(html + l, sizeof(html) - l, "</tr>\n");
 577     next_is_header = is_header && strstr(buf, "\t\t");
 578     table_line_num++;
 579     return html;
 580 }
 581
 582 static const char *
 583 munge_action_line(const char *_buf, cachemgr_request * req)
 584 {
 585     static char html[2 * 1024];
 586     char *buf = xstrdup(_buf);
 587     char *x = buf;
 588     const char *action, *description;
 589     char *p;
 590
 591     if ((p = strchr(x, '\n')))
 592        *p = '\0';
 593     action = xstrtok(&x, '\t');
 594     description = xstrtok(&x, '\t');
 595     if (!description)
 596        description = action;
 597     if (!action)
 598        return "";
 599     snprintf(html, sizeof(html), " <a href=\"%s\">%s</a>", menu_url(req, action), description);
 600     return html;
 601 }
 602
 603 static int
 604 read_reply(int s, cachemgr_request * req)
 605 {
 606     char buf[4 * 1024];
 607 #ifdef _SQUID_MSWIN_
 608
 609     int reply;
 610     char *tmpfile = tempnam(NULL, "tmp0000");
 611     FILE *fp = fopen(tmpfile, "w+");
 612 #else
 613
 614     FILE *fp = fdopen(s, "r");
 615 #endif
 616     /* interpretation states */
 617     enum {
 618         isStatusLine, isHeaders, isActions, isBodyStart, isBody, isForward, isEof, isForwardEof, isSuccess, isError
 619     } istate = isStatusLine;
 620     int parse_menu = 0;
 621     const char *action = req->action;
 622     const char *statusStr = NULL;
 623     int status = -1;
 624
 625     if (0 == strlen(req->action))
 626         parse_menu = 1;
 627     else if (0 == strcasecmp(req->action, "menu"))
 628         parse_menu = 1;
 629
 630     if (fp == NULL) {
 631 #ifdef _SQUID_MSWIN_
 632         perror(tmpfile);
 633         xfree(tmpfile);
 634         closesocket(s);
 635 #else
 636         perror("fdopen");
 637         close(s);
 638 #endif
 639         return 1;
 640     }
 641
 642 #ifdef _SQUID_MSWIN_
 643
 644     while ((reply=recv(s, buf , sizeof(buf), 0)) > 0)
 645         fwrite(buf, 1, reply, fp);
 646
 647     rewind(fp);
 648
 649 #endif
 650
 651     if (parse_menu)
 652         action = "menu";
 653
 654     /* read reply interpreting one line at a time depending on state */
 655     while (istate < isEof) {
 656         if (!fgets(buf, sizeof(buf), fp))
 657             istate = istate == isForward ? isForwardEof : isEof;
 658
 659         switch (istate) {
 660
 661         case isStatusLine:
 662             /* get HTTP status */
 663             /* uncomment the following if you want to debug headers */
 664             /* fputs("\r\n\r\n", stdout); */
 665             status = parse_status_line(buf, &statusStr);
 666             istate = status == 200 ? isHeaders : isForward;
 667             /* if cache asks for authentication, we have to reset our info */
 668
 669             if (status == 401 || status == 407) {
 670                 reset_auth(req);
 671                 status = 403;   /* Forbiden, see comments in case isForward: */
 672             }
 673
 674             /* this is a way to pass HTTP status to the Web server */
 675             if (statusStr)
 676                 printf("Status: %d %s", status, statusStr);     /* statusStr has '\n' */
 677
 678             break;
 679
 680         case isHeaders:
 681             /* forward header field */
 682             if (!strcmp(buf, "\r\n")) {         /* end of headers */
 683                 fputs("Content-Type: text/html\r\n", stdout);   /* add our type */
 684                 istate = isBodyStart;
 685             }
 686
 687             if (strncasecmp(buf, "Content-Type:", 13))  /* filter out their type */
 688                 fputs(buf, stdout);
 689
 690             break;
 691
 692         case isBodyStart:
 693             printf("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\" \"http://www.w3.org/TR/html4/loose.dtd\">\n");
 694
 695             printf("<HTML><HEAD><TITLE>CacheMgr@%s: %s</TITLE>\n",
 696                    req->hostname, action);
 697
 698             printf("<STYLE type=\"text/css\"><!--BODY{background-color:#ffffff;font-family:verdana,sans-serif}TABLE{background-color:#333333;border:0pt;padding:0pt}TH,TD{background-color:#ffffff;white-space:nowrap}--></STYLE>\n");
 699
 700             printf("</HEAD><BODY>\n");
 701
 702             if (parse_menu) {
 703                 printf("<H2><a href=\"%s\">Cache Manager</a> menu for %s:</H2>",
 704                        menu_url(req, "authenticate"), req->hostname);
 705                 printf("<UL>\n");
 706             } else {
 707                 printf("<P><A HREF=\"%s\">%s</A>\n<HR noshade size=\"1px\">\n",
 708                        menu_url(req, "menu"), "Cache Manager menu");
 709                 printf("<PRE>\n");
 710             }
 711
 712             istate = isActions;
 713             /* yes, fall through, we do not want to loose the first line */
 714
 715         case isActions:
 716             if (strncmp(buf, "action:", 7) == 0) {
 717                 fputs(" ", stdout);
 718                 fputs(munge_action_line(buf + 7, req), stdout);
 719                 break;
 720             }
 721             if (parse_menu) {
 722                 printf("<UL>\n");
 723             } else {
 724                 printf("<HR noshade size=\"1px\">\n");
 725                 printf("<PRE>\n");
 726             }
 727
 728             istate = isBody;
 729             /* yes, fall through, we do not want to loose the first line */
 730
 731         case isBody:
 732             /* interpret [and reformat] cache response */
 733
 734             if (parse_menu)
 735                 fputs(munge_menu_line(buf, req), stdout);
 736             else
 737                 fputs(munge_other_line(buf, req), stdout);
 738
 739             break;
 740
 741         case isForward:
 742             /* forward: no modifications allowed */
 743             /*
 744              * Note: we currently do not know any way to get browser.reply to
 745              * 401 to .cgi because web server filters out all auth info. Thus we
 746              * disable authentication headers for now.
 747              */
 748             if (!strncasecmp(buf, "WWW-Authenticate:", 17) || !strncasecmp(buf, "Proxy-Authenticate:", 19));    /* skip */
 749             else
 750                 fputs(buf, stdout);
 751
 752             break;
 753
 754         case isEof:
 755             /* print trailers */
 756             if (parse_menu)
 757                 printf("</UL>\n");
 758             else
 759                 printf("</table></PRE>\n");
 760
 761             print_trailer();
 762
 763             istate = isSuccess;
 764
 765             break;
 766
 767         case isForwardEof:
 768             /* indicate that we finished processing an "error" sequence */
 769             istate = isError;
 770
 771             break;
 772
 773         default:
 774             printf("%s: internal bug: invalid state reached: %d", script_name, istate);
 775
 776             istate = isError;
 777         }
 778     }
 779
 780 #ifdef _SQUID_MSWIN_
 781     fclose(fp);
 782     remove(tmpfile);
 783     xfree(tmpfile);
 784     closesocket(s);
 785 #else
 786     close(s);
 787 #endif
 788
 789     return 0;
 790 }
 791
 792 static int
 793 process_request(cachemgr_request * req)
 794 {
 795
 796     char ipbuf[MAX_IPSTRLEN];
 797     struct addrinfo *AI = NULL;
 798     IPAddress S;
 799     int s;
 800     int l;
 801
 802     static char buf[2 * 1024];
 803
 804     if (req == NULL) {
 805         auth_html(CACHEMGR_HOSTNAME, CACHE_HTTP_PORT, "");
 806         return 1;
 807     }
 808
 809     if (req->hostname == NULL) {
 810         req->hostname = xstrdup(CACHEMGR_HOSTNAME);
 811     }
 812
 813     if (req->port == 0) {
 814         req->port = CACHE_HTTP_PORT;
 815     }
 816
 817     if (req->action == NULL) {
 818         req->action = xstrdup("");
 819     }
 820
 821     if (strcmp(req->action, "authenticate") == 0) {
 822         auth_html(req->hostname, req->port, req->user_name);
 823         return 0;
 824     }
 825
 826     if (!check_target_acl(req->hostname, req->port)) {
 827         snprintf(buf, 1024, "target %s:%d not allowed in cachemgr.conf\n", req->hostname, req->port);
 828         error_html(buf);
 829         return 1;
 830     }
 831
 832     S = *gethostbyname(req->hostname);
 833
 834     if ( !S.IsAnyAddr() ) {
 835         (void) 0;
 836     } else if ( S = req->hostname)
 837         (void) 0;
 838     else {
 839         snprintf(buf, 1024, "Unknown host: %s\n", req->hostname);
 840         error_html(buf);
 841         return 1;
 842     }
 843
 844     S.SetPort(req->port);
 845
 846     S.GetAddrInfo(AI);
 847
 848 #if USE_IPV6
 849     if ((s = socket( AI->ai_family, SOCK_STREAM, 0)) < 0) {
 850 #else
 851     if ((s = socket(PF_INET, SOCK_STREAM, 0)) < 0) {
 852 #endif
 853         snprintf(buf, 1024, "socket: %s\n", xstrerror());
 854         error_html(buf);
 855         return 1;
 856     }
 857
 858     if (connect(s, AI->ai_addr, AI->ai_addrlen) < 0) {
 859         snprintf(buf, 1024, "connect %s: %s\n",
 860                  S.ToURL(ipbuf,MAX_IPSTRLEN),
 861                  xstrerror());
 862         error_html(buf);
 863         S.FreeAddrInfo(AI);
 864         return 1;
 865     }
 866
 867     S.FreeAddrInfo(AI);
 868
 869     l = snprintf(buf, sizeof(buf),
 870                  "GET cache_object://%s/%s HTTP/1.0\r\n"
 871                  "Accept: */*\r\n"
 872                  "%s"                   /* Authentication info or nothing */
 873                  "\r\n",
 874                  req->hostname,
 875                  req->action,
 876                  make_auth_header(req));
 877 #ifdef _SQUID_MSWIN_
 878     send(s, buf, l, 0);
 879 #else
 880     write(s, buf, l);
 881 #endif
 882     debug(1) fprintf(stderr, "wrote request: '%s'\n", buf);
 883     return read_reply(s, req);
 884 }
 885
 886 int
 887 main(int argc, char *argv[])
 888 {
 889     char *s;
 890     cachemgr_request *req;
 891
 892     now = time(NULL);
 893 #ifdef _SQUID_MSWIN_
 894
 895     Win32SockInit();
 896     atexit(Win32SockCleanup);
 897     _setmode( _fileno( stdin ), _O_BINARY );
 898     _setmode( _fileno( stdout ), _O_BINARY );
 899     _fmode = _O_BINARY;
 900
 901     if ((s = strrchr(argv[0], '\\')))
 902 #else
 903
 904     if ((s = strrchr(argv[0], '/')))
 905 #endif
 906
 907         progname = xstrdup(s + 1);
 908     else
 909         progname = xstrdup(argv[0]);
 910
 911     if ((s = getenv("SCRIPT_NAME")) != NULL)
 912         script_name = xstrdup(s);
 913
 914     req = read_request();
 915
 916     return process_request(req);
 917 }
 918
 919 static char *
 920 read_post_request(void)
 921 {
 922     char *s;
 923     char *buf;
 924     int len;
 925
 926     if ((s = getenv("REQUEST_METHOD")) == NULL)
 927         return NULL;
 928
 929     if (0 != strcasecmp(s, "POST"))
 930         return NULL;
 931
 932     if ((s = getenv("CONTENT_LENGTH")) == NULL)
 933         return NULL;
 934
 935     if ((len = atoi(s)) <= 0)
 936         return NULL;
 937
 938     buf = (char *)xmalloc(len + 1);
 939
 940     fread(buf, len, 1, stdin);
 941
 942     buf[len] = '\0';
 943
 944     return buf;
 945 }
 946
 947 static char *
 948 read_get_request(void)
 949 {
 950     char *s;
 951
 952     if ((s = getenv("QUERY_STRING")) == NULL)
 953         return NULL;
 954
 955     return xstrdup(s);
 956 }
 957
 958 static cachemgr_request *
 959 read_request(void)
 960 {
 961     char *buf;
 962
 963     cachemgr_request *req;
 964     char *s;
 965     char *t;
 966     char *q;
 967
 968     if ((buf = read_post_request()) != NULL)
 969         (void) 0;
 970     else if ((buf = read_get_request()) != NULL)
 971         (void) 0;
 972     else
 973         return NULL;
 974
 975 #ifdef _SQUID_MSWIN_
 976
 977     if (strlen(buf) == 0 || strlen(buf) == 4000)
 978 #else
 979
 980     if (strlen(buf) == 0)
 981 #endif
 982     {
 983         free(buf);
 984         return NULL;
 985     }
 986
 987     req = (cachemgr_request *)xcalloc(1, sizeof(cachemgr_request));
 988
 989     for (s = strtok(buf, "&"); s != NULL; s = strtok(NULL, "&")) {
 990         t = xstrdup(s);
 991
 992         if ((q = strchr(t, '=')) == NULL)
 993             continue;
 994
 995         *q++ = '\0';
 996
 997         rfc1738_unescape(t);
 998
 999         rfc1738_unescape(q);
1000
1001         if (0 == strcasecmp(t, "server") && strlen(q))
1002             req->server = xstrdup(q);
1003         else if (0 == strcasecmp(t, "host") && strlen(q))
1004             req->hostname = xstrdup(q);
1005         else if (0 == strcasecmp(t, "port") && strlen(q))
1006             req->port = atoi(q);
1007         else if (0 == strcasecmp(t, "user_name") && strlen(q))
1008             req->user_name = xstrdup(q);
1009         else if (0 == strcasecmp(t, "passwd") && strlen(q))
1010             req->passwd = xstrdup(q);
1011         else if (0 == strcasecmp(t, "auth") && strlen(q))
1012             req->pub_auth = xstrdup(q), decode_pub_auth(req);
1013         else if (0 == strcasecmp(t, "operation"))
1014             req->action = xstrdup(q);
1015     }
1016
1017     if (req->server && !req->hostname) {
1018         char *p;
1019         req->hostname = strtok(req->server, ":");
1020
1021         if ((p = strtok(NULL, ":")))
1022             req->port = atoi(p);
1023     }
1024
1025     make_pub_auth(req);
1026     debug(1) fprintf(stderr, "cmgr: got req: host: '%s' port: %d uname: '%s' passwd: '%s' auth: '%s' oper: '%s'\n",
1027                      safe_str(req->hostname), req->port, safe_str(req->user_name), safe_str(req->passwd), safe_str(req->pub_auth), safe_str(req->action));
1028     return req;
1029 }
1030
1031
1032 /* Routines to support authentication */
1033
1034 /*
1035  * Encodes auth info into a "public" form.
1036  * Currently no powerful encryption is used.
1037  */
1038 static void
1039 make_pub_auth(cachemgr_request * req)
1040 {
1041     static char buf[1024];
1042     safe_free(req->pub_auth);
1043     debug(3) fprintf(stderr, "cmgr: encoding for pub...\n");
1044
1045     if (!req->passwd || !strlen(req->passwd))
1046         return;
1047
1048     /* host | time | user | passwd */
1049     snprintf(buf, sizeof(buf), "%s|%d|%s|%s",
1050              req->hostname,
1051              (int) now,
1052              req->user_name ? req->user_name : "",
1053              req->passwd);
1054
1055     debug(3) fprintf(stderr, "cmgr: pre-encoded for pub: %s\n", buf);
1056
1057     debug(3) fprintf(stderr, "cmgr: encoded: '%s'\n", base64_encode(buf));
1058
1059     req->pub_auth = xstrdup(base64_encode(buf));
1060 }
1061
1062 static void
1063 decode_pub_auth(cachemgr_request * req)
1064 {
1065     char *buf;
1066     const char *host_name;
1067     const char *time_str;
1068     const char *user_name;
1069     const char *passwd;
1070
1071     debug(2) fprintf(stderr, "cmgr: decoding pub: '%s'\n", safe_str(req->pub_auth));
1072     safe_free(req->passwd);
1073
1074     if (!req->pub_auth || strlen(req->pub_auth) < 4 + strlen(safe_str(req->hostname)))
1075         return;
1076
1077     buf = xstrdup(base64_decode(req->pub_auth));
1078
1079     debug(3) fprintf(stderr, "cmgr: length ok\n");
1080
1081     /* parse ( a lot of memory leaks, but that is cachemgr style :) */
1082     if ((host_name = strtok(buf, "|")) == NULL)
1083         return;
1084
1085     debug(3) fprintf(stderr, "cmgr: decoded host: '%s'\n", host_name);
1086
1087     if ((time_str = strtok(NULL, "|")) == NULL)
1088         return;
1089
1090     debug(3) fprintf(stderr, "cmgr: decoded time: '%s' (now: %d)\n", time_str, (int) now);
1091
1092     if ((user_name = strtok(NULL, "|")) == NULL)
1093         return;
1094
1095     debug(3) fprintf(stderr, "cmgr: decoded uname: '%s'\n", user_name);
1096
1097     if ((passwd = strtok(NULL, "|")) == NULL)
1098         return;
1099
1100     debug(2) fprintf(stderr, "cmgr: decoded passwd: '%s'\n", passwd);
1101
1102     /* verify freshness and validity */
1103     if (atoi(time_str) + passwd_ttl < now)
1104         return;
1105
1106     if (strcasecmp(host_name, req->hostname))
1107         return;
1108
1109     debug(1) fprintf(stderr, "cmgr: verified auth. info.\n");
1110
1111     /* ok, accept */
1112     xfree(req->user_name);
1113
1114     req->user_name = xstrdup(user_name);
1115
1116     req->passwd = xstrdup(passwd);
1117
1118     xfree(buf);
1119 }
1120
1121 static void
1122 reset_auth(cachemgr_request * req)
1123 {
1124     safe_free(req->passwd);
1125     safe_free(req->pub_auth);
1126 }
1127
1128 static const char *
1129 make_auth_header(const cachemgr_request * req)
1130 {
1131     static char buf[1024];
1132     size_t stringLength = 0;
1133     const char *str64;
1134
1135     if (!req->passwd)
1136         return "";
1137
1138     snprintf(buf, sizeof(buf), "%s:%s",
1139              req->user_name ? req->user_name : "",
1140              req->passwd);
1141
1142     str64 = base64_encode(buf);
1143
1144     stringLength += snprintf(buf, sizeof(buf), "Authorization: Basic %s\r\n", str64);
1145
1146     assert(stringLength < sizeof(buf));
1147
1148     stringLength += snprintf(&buf[stringLength], sizeof(buf) - stringLength,
1149                              "Proxy-Authorization: Basic %s\r\n", str64);
1150
1151     return buf;
1152 }
1153
1154 static int
1155 check_target_acl(const char *hostname, int port)
1156 {
1157     char config_line[BUFSIZ];
1158     FILE *fp = NULL;
1159     int ret = 0;
1160     fp = fopen("cachemgr.conf", "r");
1161
1162     if (fp == NULL)
1163         fp = fopen(DEFAULT_CACHEMGR_CONFIG, "r");
1164
1165     if (fp == NULL) {
1166 #ifdef CACHEMGR_HOSTNAME_DEFINED
1167
1168         if (strcmp(hostname, CACHEMGR_HOSTNAME) == 0 && port == CACHE_HTTP_PORT)
1169             return 1;
1170
1171 #else
1172
1173         if (strcmp(hostname, "localhost") == 0)
1174             return 1;
1175
1176         if (strcmp(hostname, getfullhostname()) == 0)
1177             return 1;
1178
1179 #endif
1180
1181         return 0;
1182     }
1183
1184     while (fgets(config_line, BUFSIZ, fp)) {
1185         char *token = NULL;
1186         strtok(config_line, " \r\n\t");
1187
1188         if (config_line[0] == '#')
1189             continue;
1190
1191         if (config_line[0] == '\0')
1192             continue;
1193
1194         if ((token = strtok(config_line, ":")) == NULL)
1195             continue;
1196
1197 #if HAVE_FNMATCH_H
1198
1199         if (fnmatch(token, hostname, 0) != 0)
1200             continue;
1201
1202 #else
1203
1204         if (strcmp(token, hostname) != 0)
1205             continue;
1206
1207 #endif
1208
1209         if ((token = strtok(NULL, ":")) != NULL) {
1210             int i;
1211
1212             if (strcmp(token, "*") == 0)
1213
1214                 ;   /* Wildcard port specification */
1215             else if (strcasecmp(token, "any") == 0)
1216
1217                 ;   /* Wildcard port specification */
1218             else if (sscanf(token, "%d", &i) != 1)
1219                 continue;
1220
1221             else if (i != port)
1222                 continue;
1223         } else if (port != CACHE_HTTP_PORT)
1224             continue;
1225
1226         ret = 1;
1227
1228         break;
1229     }
1230
1231     fclose(fp);
1232     return ret;
1233 }