src/kauth/knfs.c

   1 /*
   2  * Copyright 2000, International Business Machines Corporation and others.
   3  * All Rights Reserved.
   4  *
   5  * This software has been released under the terms of the IBM Public
   6  * License.  For details, see the LICENSE file in the top-level source
   7  * directory or online at http://www.openafs.org/dl/license10.html
   8  */
   9
  10 /*
  11  * ALL RIGHTS RESERVED
  12  */
  13
  14 #include <afsconfig.h>
  15 #include <afs/param.h>
  16
  17
  18 #include <stdio.h>
  19 #include <afs/stds.h>
  20 #include <sys/types.h>
  21 #include <ctype.h>
  22 #include <sys/stat.h>
  23 #include <signal.h>
  24 #include <time.h>
  25 #include <netdb.h>
  26 #include <errno.h>
  27 #include <sys/ioctl.h>
  28 #include <string.h>
  29 #include <afs/vice.h>
  30 #include <afs/cmd.h>
  31 #include <afs/auth.h>
  32 #include <afs/afsutil.h>
  33 #include <afs/sys_prototypes.h>
  34
  35 /*
  36 Modifications:
  37
  38 29 Oct 1992 Patch GetTokens to print something reasonable when there are no tokens.
  39
  40 */
  41
  42 /* this is a structure used to communicate with the afs cache mgr, but is
  43  * otherwise irrelevant, or worse.
  44  */
  45 struct ClearToken {
  46     afs_int32 AuthHandle;
  47     char HandShakeKey[8];
  48     afs_int32 ViceId;
  49     afs_int32 BeginTimestamp;
  50     afs_int32 EndTimestamp;
  51 };
  52
  53
  54 static int
  55 SetSysname(afs_int32 ahost, afs_int32 auid, char *sysname)
  56 {
  57     afs_int32 code;
  58     afs_int32 pheader[6];
  59     char space[1200], *tp;
  60     struct ViceIoctl blob;
  61     afs_int32 setp = 1;
  62
  63     /* otherwise we've got the token, now prepare to build the pioctl args */
  64     pheader[0] = ahost;
  65     pheader[1] = auid;
  66     pheader[2] = 0;             /* group low */
  67     pheader[3] = 0;             /* group high */
  68     pheader[4] = 38 /*VIOC_AFS_SYSNAME */ ;     /* sysname pioctl index */
  69     pheader[5] = 1;             /* NFS protocol exporter # */
  70
  71     /* copy stuff in */
  72     memcpy(space, pheader, sizeof(pheader));
  73     tp = space + sizeof(pheader);
  74
  75     /* finally setup the pioctl call's parameters */
  76     blob.in_size = sizeof(pheader);
  77     blob.in = space;
  78     blob.out_size = 0;
  79     blob.out = NULL;
  80     memcpy(tp, &setp, sizeof(afs_int32));
  81     tp += sizeof(afs_int32);
  82     strcpy(tp, sysname);
  83     blob.in_size += sizeof(afs_int32) + strlen(sysname) + 1;
  84     tp += strlen(sysname);
  85     *(tp++) = '\0';
  86     code = pioctl(NULL, _VICEIOCTL(99), &blob, 0);
  87     if (code) {
  88         code = errno;
  89     }
  90     return code;
  91 }
  92
  93
  94 static int
  95 GetTokens(afs_int32 ahost, afs_int32 auid)
  96 {
  97     struct ViceIoctl iob;
  98     afs_int32 pheader[6];
  99     char tbuffer[1024];
 100     afs_int32 code = 0;
 101     int index, newIndex;
 102     char *stp;                  /* secret token ptr */
 103     struct ClearToken ct;
 104     char *tp;
 105     afs_int32 temp, gotit = 0;
 106     int maxLen;                 /* biggest ticket we can copy */
 107     int tktLen;                 /* server ticket length */
 108     time_t tokenExpireTime;
 109     char UserName[MAXKTCNAMELEN + MAXKTCNAMELEN];
 110     struct ktc_token token;
 111     struct ktc_principal clientName;
 112     time_t current_time;
 113     char *expireString;
 114
 115     current_time = time(0);
 116
 117     /* otherwise we've got the token, now prepare to build the pioctl args */
 118     pheader[0] = ahost;
 119     pheader[1] = auid;
 120     pheader[2] = 0;             /* group low */
 121     pheader[3] = 0;             /* group high */
 122     pheader[4] = 8;             /* gettoken pioctl index */
 123     pheader[5] = 1;             /* NFS protocol exporter # */
 124
 125     for (index = 0; index < 200; index++) {     /* sanity check in case pioctl fails */
 126         code = ktc_ListTokens(index, &newIndex, &clientName);
 127         if (code) {
 128             if (code == KTC_NOENT) {
 129                 /* all done */
 130                 if (!gotit)
 131                     printf("knfs: there are no tokens here.\n");
 132                 code = 0;
 133             }
 134             break;              /* done, but failed */
 135         }
 136         if (strcmp(clientName.name, "afs") != 0)
 137             continue;           /* wrong ticket service */
 138
 139         /* copy stuff in */
 140         memcpy(tbuffer, pheader, sizeof(pheader));
 141         tp = tbuffer + sizeof(pheader);
 142         memcpy(tp, &index, sizeof(afs_int32));
 143         tp += sizeof(afs_int32);
 144         iob.in = tbuffer;
 145         iob.in_size = sizeof(afs_int32) + sizeof(pheader);
 146         iob.out = tbuffer;
 147         iob.out_size = sizeof(tbuffer);
 148         code = pioctl(NULL, _VICEIOCTL(99), &iob, 0);
 149         if (code < 0 && errno == EDOM)
 150             return KTC_NOENT;
 151         else if (code == 0) {
 152             /* check to see if this is the right cell/realm */
 153             tp = tbuffer;
 154             memcpy(&temp, tp, sizeof(afs_int32));       /* get size of secret token */
 155             tktLen = temp;      /* remember size of ticket */
 156             tp += sizeof(afs_int32);
 157             stp = tp;           /* remember where ticket is, for later */
 158             tp += temp;         /* skip ticket for now */
 159             memcpy(&temp, tp, sizeof(afs_int32));       /* get size of clear token */
 160             if (temp != sizeof(struct ClearToken))
 161                 return KTC_ERROR;
 162             tp += sizeof(afs_int32);    /* skip length */
 163             memcpy(&ct, tp, temp);      /* copy token for later use */
 164             tp += temp;         /* skip clear token itself */
 165             tp += sizeof(afs_int32);    /* skip primary flag */
 166             /* tp now points to the cell name */
 167             if (strcmp(tp, clientName.cell) == 0) {
 168                 /* closing in now, we've got the right cell */
 169                 gotit = 1;
 170                 maxLen =
 171                     sizeof(token) - sizeof(struct ktc_token) +
 172                     MAXKTCTICKETLEN;
 173                 if (tktLen < 0 || tktLen > maxLen)
 174                     return KTC_TOOBIG;
 175                 memcpy(token.ticket, stp, tktLen);
 176                 token.startTime = ct.BeginTimestamp;
 177                 token.endTime = ct.EndTimestamp;
 178                 if (ct.AuthHandle == -1)
 179                     ct.AuthHandle = 999;
 180                 token.kvno = ct.AuthHandle;
 181                 memcpy(&token.sessionKey, ct.HandShakeKey,
 182                        sizeof(struct ktc_encryptionKey));
 183                 token.ticketLen = tktLen;
 184                 if ((token.kvno == 999) ||      /* old style bcrypt ticket */
 185                     (ct.BeginTimestamp &&       /* new w/ prserver lookup */
 186                      (((ct.EndTimestamp - ct.BeginTimestamp) & 1) == 1))) {
 187                     sprintf(clientName.name, "AFS ID %d", ct.ViceId);
 188                     clientName.instance[0] = 0;
 189                 } else {
 190                     sprintf(clientName.name, "Unix UID %d", ct.ViceId);
 191                     clientName.instance[0] = 0;
 192                 }
 193                 strlcpy(clientName.cell, tp, sizeof(clientName.cell));
 194
 195                 tokenExpireTime = token.endTime;
 196                 strlcpy(UserName, clientName.name, sizeof(UserName));
 197                 if (clientName.instance[0] != 0) {
 198                     strlcat(UserName, ".", sizeof(UserName));
 199                     strlcat(UserName, clientName.instance, sizeof(UserName));
 200                 }
 201                 if (UserName[0] == 0)
 202                     printf("Tokens");
 203                 else if (strncmp(UserName, "AFS ID", 6) == 0) {
 204                     printf("User's (%s) tokens", UserName);
 205                 } else if (strncmp(UserName, "Unix UID", 8) == 0) {
 206                     printf("Tokens");
 207                 } else
 208                     printf("User %s's tokens", UserName);
 209                 printf(" for %s%s%s@%s ", clientName.name,
 210                        clientName.instance[0] ? "." : "", clientName.instance,
 211                        clientName.cell);
 212                 if (tokenExpireTime <= current_time)
 213                     printf("[>> Expired <<]\n");
 214                 else {
 215                     expireString = ctime(&tokenExpireTime);
 216                     expireString += 4;  /*Move past the day of week */
 217                     expireString[12] = '\0';
 218                     printf("[Expires %s]\n", expireString);
 219                 }
 220
 221             }
 222         }
 223     }
 224     return code;
 225 }
 226
 227
 228 static int
 229 NFSUnlog(afs_int32 ahost, afs_int32 auid)
 230 {
 231     afs_int32 code;
 232     afs_int32 pheader[6];
 233     char space[1200];
 234     struct ViceIoctl blob;
 235
 236     /* otherwise we've got the token, now prepare to build the pioctl args */
 237     pheader[0] = ahost;
 238     pheader[1] = auid;
 239     pheader[2] = 0;             /* group low */
 240     pheader[3] = 0;             /* group high */
 241     pheader[4] = 9;             /* unlog pioctl index */
 242     pheader[5] = 1;             /* NFS protocol exporter # */
 243
 244     /* copy stuff in */
 245     memcpy(space, pheader, sizeof(pheader));
 246
 247     /* finally setup the pioctl call's parameters */
 248     blob.in_size = sizeof(pheader);
 249     blob.in = space;
 250     blob.out_size = 0;
 251     blob.out = NULL;
 252     code = pioctl(NULL, _VICEIOCTL(99), &blob, 0);
 253     if (code) {
 254         code = errno;
 255     }
 256     return code;
 257 }
 258
 259 /* Copy the AFS service token into the kernel for a particular host and user */
 260 static int
 261 NFSCopyToken(afs_int32 ahost, afs_int32 auid)
 262 {
 263     struct ktc_principal client, server;
 264     struct ktc_token theTicket;
 265     afs_int32 code;
 266     afs_int32 pheader[6];
 267     char space[1200];
 268     struct ClearToken ct;
 269     afs_int32 index, newIndex;
 270     afs_int32 temp;             /* for bcopy */
 271     char *tp;
 272     struct ViceIoctl blob;
 273
 274     for (index = 0;; index = newIndex) {
 275         code = ktc_ListTokens(index, &newIndex, &server);
 276         if (code) {
 277             if (code == KTC_NOENT) {
 278                 /* all done */
 279                 code = 0;
 280             }
 281             break;              /* done, but failed */
 282         }
 283         if (strcmp(server.name, "afs") != 0)
 284             continue;           /* wrong ticket service */
 285         code = ktc_GetToken(&server, &theTicket, sizeof(theTicket), &client);
 286         if (code)
 287             return code;
 288
 289         /* otherwise we've got the token, now prepare to build the pioctl args */
 290         pheader[0] = ahost;
 291         pheader[1] = auid;
 292         pheader[2] = 0;         /* group low */
 293         pheader[3] = 0;         /* group high */
 294         pheader[4] = 3;         /* set token pioctl index */
 295         pheader[5] = 1;         /* NFS protocol exporter # */
 296
 297         /* copy in the header */
 298         memcpy(space, pheader, sizeof(pheader));
 299         tp = space + sizeof(pheader);
 300         /* copy in the size of the encrypted part */
 301         memcpy(tp, &theTicket.ticketLen, sizeof(afs_int32));
 302         tp += sizeof(afs_int32);
 303         /* copy in the ticket itself */
 304         memcpy(tp, theTicket.ticket, theTicket.ticketLen);
 305         tp += theTicket.ticketLen;
 306         /* copy in "clear token"'s size */
 307         temp = sizeof(struct ClearToken);
 308         memcpy(tp, &temp, sizeof(afs_int32));
 309         tp += sizeof(afs_int32);
 310         /* create the clear token and copy *it* in */
 311         ct.AuthHandle = theTicket.kvno; /* where we hide the key version # */
 312         memcpy(ct.HandShakeKey, &theTicket.sessionKey,
 313                sizeof(ct.HandShakeKey));
 314
 315         ct.ViceId = auid;
 316         ct.BeginTimestamp = theTicket.startTime;
 317         ct.EndTimestamp = theTicket.endTime;
 318         memcpy(tp, &ct, sizeof(ct));
 319         tp += sizeof(ct);
 320         /* copy in obsolete primary flag */
 321         temp = 0;
 322         memcpy(tp, &temp, sizeof(afs_int32));
 323         tp += sizeof(afs_int32);
 324         /* copy in cell name, null terminated */
 325         strcpy(tp, server.cell);
 326         tp += strlen(server.cell) + 1;
 327
 328         /* finally setup the pioctl call's parameters */
 329         blob.in_size = tp - space;
 330         blob.in = space;
 331         blob.out_size = 0;
 332         blob.out = NULL;
 333         code = pioctl(NULL, _VICEIOCTL(99), &blob, 0);
 334         if (code) {
 335             code = errno;
 336             break;
 337         }
 338     }
 339     return code;
 340 }
 341
 342 static int
 343 cmdproc(struct cmd_syndesc *as, void *arock)
 344 {
 345     struct hostent *the;
 346     char *tp, *sysname = 0;
 347     afs_int32 uid, addr;
 348     afs_int32 code;
 349
 350     the = (struct hostent *)
 351         hostutil_GetHostByName(tp = as->parms[0].items->data);
 352     if (!the) {
 353         printf("knfs: unknown host '%s'.\n", tp);
 354         return -1;
 355     }
 356     memcpy(&addr, the->h_addr, sizeof(afs_int32));
 357     uid = -1;
 358     if (as->parms[1].items) {
 359         code = util_GetInt32(tp = as->parms[1].items->data, &uid);
 360         if (code) {
 361             printf("knfs: can't parse '%s' as a number (UID)\n", tp);
 362             return code;
 363         }
 364     } else
 365         uid = -1;               /* means wildcard: match any user on this host */
 366
 367     /*
 368      * If not "-id" is passed then we use the getuid() id, unless it's root
 369      * that is doing it in which case we only authenticate as "system:anyuser"
 370      * as it's appropriate for root. (The cm handles conversions from 0 to
 371      * "afs_nobody"!)
 372      */
 373     if (uid == -1) {
 374         uid = getuid();
 375     }
 376
 377     if (as->parms[2].items) {
 378         sysname = as->parms[2].items->data;
 379     }
 380
 381     if (as->parms[4].items) {
 382         /* tokens specified */
 383         code = GetTokens(addr, uid);
 384         if (code) {
 385             if (code == ENOEXEC)
 386                 printf
 387                     ("knfs: Translator in 'passwd sync' mode; remote uid must be the same as local uid\n");
 388             else
 389                 printf("knfs: failed to get tokens for uid %d (code %d)\n",
 390                        uid, code);
 391         }
 392         return code;
 393     }
 394
 395     /* finally, parsing is done, make the call */
 396     if (as->parms[3].items) {
 397         /* unlog specified */
 398         code = NFSUnlog(addr, uid);
 399         if (code) {
 400             if (code == ENOEXEC)
 401                 printf
 402                     ("knfs: Translator in 'passwd sync' mode; remote uid must be the same as local uid\n");
 403             else
 404                 printf("knfs: failed to unlog (code %d)\n", code);
 405         }
 406     } else {
 407         code = NFSCopyToken(addr, uid);
 408         if (code) {
 409             if (code == ENOEXEC)
 410                 printf
 411                     ("knfs: Translator in 'passwd sync' mode; remote uid must be the same as local uid\n");
 412             else
 413                 printf("knfs: failed to copy tokens (code %d)\n", code);
 414         }
 415         if (sysname) {
 416             code = SetSysname(addr, uid, sysname);
 417             if (code) {
 418                 printf("knfs: failed to set client's @sys to %s (code %d)\n",
 419                        sysname, code);
 420             }
 421         }
 422     }
 423     return code;
 424 }
 425
 426 #include "AFS_component_version_number.c"
 427
 428 int
 429 main(int argc, char **argv)
 430 {
 431     struct cmd_syndesc *ts;
 432     afs_int32 code;
 433
 434 #ifdef  AFS_AIX32_ENV
 435     /*
 436      * The following signal action for AIX is necessary so that in case of a
 437      * crash (i.e. core is generated) we can include the user's data section
 438      * in the core dump. Unfortunately, by default, only a partial core is
 439      * generated which, in many cases, isn't too useful.
 440      */
 441     struct sigaction nsa;
 442
 443     sigemptyset(&nsa.sa_mask);
 444     nsa.sa_handler = SIG_DFL;
 445     nsa.sa_flags = SA_FULLDUMP;
 446     sigaction(SIGABRT, &nsa, NULL);
 447     sigaction(SIGSEGV, &nsa, NULL);
 448 #endif
 449
 450     ts = cmd_CreateSyntax(NULL, cmdproc, NULL, "copy tickets for NFS");
 451     cmd_AddParm(ts, "-host", CMD_SINGLE, CMD_REQUIRED, "host name");
 452     cmd_AddParm(ts, "-id", CMD_SINGLE, CMD_OPTIONAL, "user ID (decimal)");
 453     cmd_AddParm(ts, "-sysname", CMD_SINGLE, CMD_OPTIONAL,
 454                 "host's '@sys' value");
 455     cmd_AddParm(ts, "-unlog", CMD_FLAG, CMD_OPTIONAL, "unlog remote user");
 456     cmd_AddParm(ts, "-tokens", CMD_FLAG, CMD_OPTIONAL,
 457                 "display all tokens for remote [host,id]");
 458
 459     code = cmd_Dispatch(argc, argv);
 460     return code;
 461 }