src/kauth/klog.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 #include <afsconfig.h>
  11 #include <afs/param.h>
  12 #include <afs/stds.h>
  13
  14 #include <roken.h>
  15
  16 #include <rx/xdr.h>
  17 #include <lock.h>
  18 #include <ubik.h>
  19 #include <afs/com_err.h>
  20 #include <afs/cellconfig.h>
  21 #include <afs/cmd.h>
  22
  23 #include "kauth.h"
  24 #include "kautils.h"
  25 #include "kauth_internal.h"
  26 #include "assert.h"
  27
  28
  29 /* This code borrowed heavily from the previous version of log.  Here is the
  30    intro comment for that program: */
  31
  32 /*
  33         log -- tell the Andrew Cache Manager your password
  34         5 June 1985
  35         modified
  36         February 1986
  37
  38         Further modified in August 1987 to understand cell IDs.
  39  */
  40
  41 /* Current Usage:
  42      klog [principal [password]] [-t] [-c cellname] [-servers <hostlist>]
  43
  44      where:
  45        principal is of the form 'name' or 'name@cell' which provides the
  46           cellname.  See the -c option below.
  47        password is the user's password.  This form is NOT recommended for
  48           interactive users.
  49        -t advises klog to write a Kerberos style ticket file in /tmp.
  50        -c identifies cellname as the cell in which authentication is to take
  51           place.
  52        -servers allows the explicit specification of the hosts providing
  53           authentication services for the cell being used for authentication.
  54  */
  55
  56 #define KLOGEXIT(code) assert(!code || code >= KAMINERROR); \
  57                        rx_Finalize(); \
  58                        (!code ? exit(0) : exit((code)-KAMINERROR+1))
  59 int CommandProc(struct cmd_syndesc *as, void *arock);
  60
  61 static int zero_argc;
  62 static char **zero_argv;
  63
  64 int
  65 osi_audit(void)
  66 {
  67     return 0;
  68 }
  69
  70 int
  71 main(int argc, char *argv[])
  72 {
  73     struct cmd_syndesc *ts;
  74     afs_int32 code;
  75 #ifdef  AFS_AIX32_ENV
  76     /*
  77      * The following signal action for AIX is necessary so that in case of a
  78      * crash (i.e. core is generated) we can include the user's data section
  79      * in the core dump. Unfortunately, by default, only a partial core is
  80      * generated which, in many cases, isn't too useful.
  81      */
  82     struct sigaction nsa;
  83
  84     sigemptyset(&nsa.sa_mask);
  85     nsa.sa_handler = SIG_DFL;
  86     nsa.sa_flags = SA_FULLDUMP;
  87     sigaction(SIGABRT, &nsa, NULL);
  88     sigaction(SIGSEGV, &nsa, NULL);
  89 #endif
  90     zero_argc = argc;
  91     zero_argv = argv;
  92
  93     ts = cmd_CreateSyntax(NULL, CommandProc, NULL, 0,
  94                           "obtain Kerberos authentication");
  95
  96 #define aXFLAG 0
  97 #define aPRINCIPAL 1
  98 #define aPASSWORD 2
  99 #define aCELL 3
 100 #define aSERVERS 4
 101 #define aPIPE 5
 102 #define aSILENT 6
 103 #define aLIFETIME 7
 104 #define aSETPAG 8
 105 #define aTMP 9
 106
 107
 108     cmd_AddParm(ts, "-x", CMD_FLAG, CMD_OPTIONAL, "(obsolete, noop)");
 109     cmd_Seek(ts, aPRINCIPAL);
 110     cmd_AddParm(ts, "-principal", CMD_SINGLE, CMD_OPTIONAL, "user name");
 111     cmd_AddParm(ts, "-password", CMD_SINGLE, CMD_OPTIONAL, "user's password");
 112     cmd_AddParm(ts, "-cell", CMD_SINGLE, CMD_OPTIONAL, "cell name");
 113     cmd_AddParm(ts, "-servers", CMD_LIST, CMD_OPTIONAL,
 114                 "explicit list of servers");
 115     cmd_AddParm(ts, "-pipe", CMD_FLAG, CMD_OPTIONAL,
 116                 "read password from stdin");
 117     cmd_AddParm(ts, "-silent", CMD_FLAG, CMD_OPTIONAL, "silent operation");
 118     cmd_AddParm(ts, "-lifetime", CMD_SINGLE, CMD_OPTIONAL,
 119                 "ticket lifetime in hh[:mm[:ss]]");
 120     cmd_AddParm(ts, "-setpag", CMD_FLAG, CMD_OPTIONAL,
 121                 "Create a new setpag before authenticating");
 122     cmd_AddParm(ts, "-tmp", CMD_FLAG, CMD_OPTIONAL,
 123                 "write Kerberos-style ticket file in /tmp");
 124
 125     code = cmd_Dispatch(argc, argv);
 126     KLOGEXIT(code);
 127 }
 128
 129 static char *
 130 getpipepass(void)
 131 {
 132     static char gpbuf[BUFSIZ];
 133     /* read a password from stdin, stop on \n or eof */
 134     int i, tc;
 135     memset(gpbuf, 0, sizeof(gpbuf));
 136     for (i = 0; i < (sizeof(gpbuf) - 1); i++) {
 137         tc = fgetc(stdin);
 138         if (tc == '\n' || tc == EOF)
 139             break;
 140         gpbuf[i] = tc;
 141     }
 142     return gpbuf;
 143 }
 144
 145 int
 146 CommandProc(struct cmd_syndesc *as, void *arock)
 147 {
 148     char name[MAXKTCNAMELEN];
 149     char instance[MAXKTCNAMELEN];
 150     char cell[MAXKTCREALMLEN];
 151     char realm[MAXKTCREALMLEN];
 152     afs_uint32 serverList[MAXSERVERS];
 153     char *lcell;                /* local cellname */
 154     char lrealm[MAXKTCREALMLEN];        /* uppercase copy of local cellname */
 155     int code;
 156     int i, dosetpag;
 157     Date lifetime;              /* requested ticket lifetime */
 158
 159     struct passwd pwent;
 160     struct passwd *pw = &pwent;
 161     char passwd[BUFSIZ];
 162
 163     static char rn[] = "klog";  /*Routine name */
 164     static int Pipe = 0;        /* reading from a pipe */
 165     static int Silent = 0;      /* Don't want error messages */
 166
 167     int explicit;               /* servers specified explicitly */
 168     int local;                  /* explicit cell is same a local one */
 169     int foundPassword = 0;      /*Not yet, anyway */
 170     int foundExplicitCell = 0;  /*Not yet, anyway */
 171     int writeTicketFile = 0;    /* write ticket file to /tmp */
 172     afs_int32 password_expires = -1;
 173
 174     char *reason;               /* string describing errors */
 175
 176     /* blow away command line arguments */
 177     for (i = 1; i < zero_argc; i++)
 178         memset(zero_argv[i], 0, strlen(zero_argv[i]));
 179     zero_argc = 0;
 180
 181     /* first determine quiet flag based on -silent switch */
 182     Silent = (as->parms[aSILENT].items ? 1 : 0);
 183     Pipe = (as->parms[aPIPE].items ? 1 : 0);
 184
 185     /* Determine if we should also do a setpag based on -setpag switch */
 186     dosetpag = (as->parms[aSETPAG].items ? 1 : 0);
 187
 188     if (as->parms[aTMP].items) {
 189         writeTicketFile = 1;
 190     }
 191
 192     if (as->parms[aCELL].items) {
 193         /*
 194          * cell name explicitly mentioned; take it in if no other cell name
 195          * has already been specified and if the name actually appears.  If
 196          * the given cell name differs from our own, we don't do a lookup.
 197          */
 198         foundExplicitCell = 1;
 199         strncpy(realm, as->parms[aCELL].items->data, sizeof(realm));
 200         /* XXX the following is just a hack to handle the afscell environment XXX */
 201         (void)afsconf_GetCellInfo((struct afsconf_dir *)0, realm, 0,
 202                                   (struct afsconf_cell *)0);
 203     }
 204
 205     code = ka_Init(0);
 206     if (code || !(lcell = ka_LocalCell())) {
 207       nocell:
 208         if (!Silent)
 209             afs_com_err(rn, code, "Can't get local cell name!");
 210         KLOGEXIT(code);
 211     }
 212     if ((code = ka_CellToRealm(lcell, lrealm, 0)))
 213         goto nocell;
 214
 215     strcpy(instance, "");
 216
 217     /* Parse our arguments. */
 218
 219     if (as->parms[aCELL].items) {
 220         /*
 221          * cell name explicitly mentioned; take it in if no other cell name
 222          * has already been specified and if the name actually appears.  If
 223          * the given cell name differs from our own, we don't do a lookup.
 224          */
 225         foundExplicitCell = 1;
 226         strncpy(realm, as->parms[aCELL].items->data, sizeof(realm));
 227     }
 228
 229     if (as->parms[aSERVERS].items) {
 230         /* explicit server list */
 231         int i;
 232         struct cmd_item *ip;
 233         char *ap[MAXSERVERS + 2];
 234
 235         for (ip = as->parms[aSERVERS].items, i = 2; ip; ip = ip->next, i++)
 236             ap[i] = ip->data;
 237         ap[0] = "";
 238         ap[1] = "-servers";
 239         code = ubik_ParseClientList(i, ap, serverList);
 240         if (code) {
 241             if (!Silent) {
 242                 afs_com_err(rn, code, "could not parse server list");
 243             }
 244             return code;
 245         }
 246         explicit = 1;
 247     } else
 248         explicit = 0;
 249
 250     if (as->parms[aPRINCIPAL].items) {
 251         ka_ParseLoginName(as->parms[aPRINCIPAL].items->data, name, instance,
 252                           cell);
 253         if (strlen(instance) > 0)
 254             if (!Silent) {
 255                 fprintf(stderr,
 256                         "Non-null instance (%s) may cause strange behavior.\n",
 257                         instance);
 258             }
 259         if (strlen(cell) > 0) {
 260             if (foundExplicitCell) {
 261                 if (!Silent) {
 262                     fprintf(stderr,
 263                             "%s: May not specify an explicit cell twice.\n",
 264                             rn);
 265                 }
 266                 return -1;
 267             }
 268             foundExplicitCell = 1;
 269             strncpy(realm, cell, sizeof(realm));
 270         }
 271         pw->pw_name = name;
 272     } else {
 273         /* No explicit name provided: use Unix uid. */
 274         pw = getpwuid(getuid());
 275         if (pw == 0) {
 276             if (!Silent) {
 277                 fprintf(stderr,
 278                         "Can't figure out your name in local cell %s from your user id.\n",
 279                         lcell);
 280                 fprintf(stderr, "Try providing the user name.\n");
 281             }
 282             KLOGEXIT(KABADARGUMENT);
 283         }
 284     }
 285
 286     if (as->parms[aPASSWORD].items) {
 287         /*
 288          * Current argument is the desired password string.  Remember it in
 289          * our local buffer, and zero out the argument string - anyone can
 290          * see it there with ps!
 291          */
 292         foundPassword = 1;
 293         strncpy(passwd, as->parms[aPASSWORD].items->data, sizeof(passwd));
 294         memset(as->parms[aPASSWORD].items->data, 0,
 295                strlen(as->parms[aPASSWORD].items->data));
 296     }
 297
 298     if (as->parms[aLIFETIME].items) {
 299         char *life = as->parms[aLIFETIME].items->data;
 300         char *sp;               /* string ptr to rest of life */
 301         lifetime = 3600 * strtol(life, &sp, 0); /* hours */
 302         if (sp == life) {
 303           bad_lifetime:
 304             if (!Silent)
 305                 fprintf(stderr, "%s: translating '%s' to lifetime failed\n",
 306                         rn, life);
 307             return KABADARGUMENT;
 308         }
 309         if (*sp == ':') {
 310             life = sp + 1;      /* skip the colon */
 311             lifetime += 60 * strtol(life, &sp, 0);      /* minutes */
 312             if (sp == life)
 313                 goto bad_lifetime;
 314             if (*sp == ':') {
 315                 life = sp + 1;
 316                 lifetime += strtol(life, &sp, 0);       /* seconds */
 317                 if (sp == life)
 318                     goto bad_lifetime;
 319                 if (*sp)
 320                     goto bad_lifetime;
 321             } else if (*sp)
 322                 goto bad_lifetime;
 323         } else if (*sp)
 324             goto bad_lifetime;
 325         if (lifetime > MAXKTCTICKETLIFETIME) {
 326             if (!Silent)
 327                 fprintf(stderr,
 328                         "%s: a lifetime of %.2f hours is too long, must be less than %d.\n",
 329                         rn, (double)lifetime / 3600.0,
 330                         MAXKTCTICKETLIFETIME / 3600);
 331             KLOGEXIT(KABADARGUMENT);
 332         }
 333     } else
 334         lifetime = 0;
 335
 336     if (!foundExplicitCell)
 337         strcpy(realm, lcell);
 338     if ((code = ka_CellToRealm(realm, realm, &local))) {
 339         if (!Silent)
 340             afs_com_err(rn, code, "Can't convert cell to realm");
 341         KLOGEXIT(code);
 342     }
 343
 344     /* Get the password if it wasn't provided. */
 345     if (!foundPassword) {
 346         if (Pipe) {
 347             strncpy(passwd, getpipepass(), sizeof(passwd));
 348         } else {
 349             if (ka_UserReadPassword
 350                 ("Password:", passwd, sizeof(passwd), &reason)) {
 351                 fprintf(stderr, "Unable to login because %s.\n", reason);
 352                 KLOGEXIT(KABADARGUMENT);
 353             }
 354         }
 355     }
 356
 357     if (explicit)
 358         ka_ExplicitCell(realm, serverList);
 359
 360     code =
 361         ka_UserAuthenticateGeneral(KA_USERAUTH_VERSION +
 362                                    (dosetpag ? KA_USERAUTH_DOSETPAG2 : 0),
 363                                    pw->pw_name, instance, realm, passwd,
 364                                    lifetime, &password_expires, 0, &reason);
 365     memset(passwd, 0, sizeof(passwd));
 366     if (code) {
 367         if (!Silent) {
 368             fprintf(stderr, "Unable to authenticate to AFS because %s.\n",
 369                     reason);
 370         }
 371         KLOGEXIT(code);
 372     }
 373 #ifndef AFS_KERBEROS_ENV
 374     if (writeTicketFile) {
 375         code = krb_write_ticket_file(realm);
 376         if (!Silent) {
 377             if (code)
 378                 afs_com_err(rn, code, "writing Kerberos ticket file");
 379             else
 380                 fprintf(stderr, "Wrote ticket file to /tmp\n");
 381         }
 382     }
 383 #endif
 384
 385 #ifdef DEBUGEXPIRES
 386     if (password_expires >= 0) {
 387         printf("password expires at %ld\n", password_expires);
 388     }
 389 #endif /* DEBUGEXPIRES */
 390
 391     return 0;
 392 }