Import Upstream version 1.8.5

[hcoop/debian/openafs.git] / src / auth / ktc.c

/*
 * Copyright 2000, International Business Machines Corporation and others.
 * All Rights Reserved.
 *
 * This software has been released under the terms of the IBM Public
 * License.  For details, see the LICENSE file in the top-level source
 * directory or online at http://www.openafs.org/dl/license10.html
 */

/* ticket caching code */

#include <afsconfig.h>
#include <afs/param.h>

#include <roken.h>

#include <afs/stds.h>
#include <afs/opr.h>
#include <afs/pthread_glock.h>
#include <ctype.h>

#ifdef HAVE_SYS_FILE_H
#include <sys/file.h>
#endif

#if defined(UKERNEL)
#include "afsincludes.h"
#endif

#ifdef  AFS_AIX_ENV
#include <sys/lockf.h>
#ifdef AFS_AIX51_ENV
#include <sys/cred.h>
#ifdef HAVE_SYS_PAG_H
#include <sys/pag.h>
#endif
#endif
#endif

#ifdef HAVE_CRT_EXTERNS_H
#include <crt_externs.h>
#endif

#include <afs/vice.h>
#include "auth.h"
#include <afs/venus.h>
#include <afs/afsutil.h>

#if !defined(UKERNEL)
#include <afs/sys_prototypes.h>
#endif

#if defined(AFS_LINUX26_ENV)
#include <sys/syscall.h>
#if defined(SYS_keyctl)
/* Open code this value to avoid a dependency on keyutils */
#define KEYCTL_SESSION_TO_PARENT        18
#endif
#endif

#include "token.h"
#include "ktc.h"

#ifdef AFS_KERBEROS_ENV
#include "cellconfig.h"
static char lcell[MAXCELLCHARS];

#define TKT_ROOT "/tmp/tkt"

#define KSUCCESS 0
#define KFAILURE 255

/* Definitions for ticket file utilities */
#define R_TKT_FIL       0
#define W_TKT_FIL       1

/* Error codes returned by ticket file utilities */
#define         NO_TKT_FIL      76      /* No ticket file found */
#define         TKT_FIL_ACC     77      /* Couldn't access tkt file */
#define         TKT_FIL_LCK     78      /* Couldn't lock ticket file */
#define         TKT_FIL_FMT     79      /* Bad ticket file format */
#define         TKT_FIL_INI     80      /* afs_tf_init not called first */

/* Values returned by get_credentials */
#define         RET_TKFIL      21       /* Can't read ticket file */

#ifndef BUFSIZ
#define BUFSIZ 4096
#endif

#if     defined(AFS_AIX_ENV) || defined(AFS_SUN5_ENV)
static struct flock fileWlock = { F_WRLCK, 0, 0, 0, 0, 0 };
static struct flock fileRlock = { F_RDLCK, 0, 0, 0, 0, 0 };
static struct flock fileUlock = { F_UNLCK, 0, 0, 0, 0, 0 };
#endif
#ifdef AFS_HPUX_ENV
static struct flock fileWlock = { F_WRLCK, 0, 0, 0, 0 };
static struct flock fileRlock = { F_RDLCK, 0, 0, 0, 0 };
static struct flock fileUlock = { F_UNLCK, 0, 0, 0, 0 };
#endif

#ifndef EOF
#define EOF (-1)
#endif

/* the following routines aren't static anymore on behalf of the kerberos IV
 * compatibility library built in subtree krb.
 */
int afs_tf_init(char *, int);
int afs_tf_get_pname(char *);
int afs_tf_get_pinst(char *);
int afs_tf_get_cred(struct ktc_principal *, struct ktc_token *);
int afs_tf_save_cred(struct ktc_principal *, struct ktc_token *,
                     struct ktc_principal *);
int afs_tf_close(void);
int afs_tf_create(char *, char *);
int afs_tf_dest_tkt(void);
static void ktc_LocalCell(void);
#endif /* AFS_KERBEROS_ENV */

#ifdef AFS_DUX40_ENV
#define PIOCTL afs_pioctl
#elif defined(UKERNEL)
#define PIOCTL(A,B,C,D) (errno = (call_syscall(AFSCALL_PIOCTL,A,B,C,D)), errno?-1:0)
#else
#define PIOCTL pioctl
#endif

#if !defined(UKERNEL)
/* this is a structure used to communicate with the afs cache mgr, but is
 * otherwise irrelevant */
struct ClearToken {
    afs_int32 AuthHandle;
    char HandShakeKey[8];
    afs_int32 ViceId;
    afs_int32 BeginTimestamp;
    afs_int32 EndTimestamp;
};
#endif /* !defined(UKERNEL) */

#define MAXLOCALTOKENS 4

static struct {
    int valid;
    struct ktc_principal server;
    struct ktc_principal client;
    struct ktc_token token;
} local_tokens[MAXLOCALTOKENS];

static int
GetToken(struct ktc_principal *aserver, struct ktc_token *atoken,
          int atokenLen, struct ktc_principal *alicnet, afs_int32 *aviceid);


#define MAXPIOCTLTOKENLEN \
(3*sizeof(afs_int32)+MAXKTCTICKETLEN+sizeof(struct ClearToken)+MAXKTCREALMLEN)

static int
SetToken(struct ktc_principal *aserver, struct ktc_token *atoken,
            struct ktc_principal *aclient, afs_int32 flags)
{
    struct ViceIoctl iob;
    char tbuffer[MAXPIOCTLTOKENLEN];
    char *tp;
    struct ClearToken ct;
    afs_int32 code;
    afs_int32 temp;

    if (strcmp(aserver->name, "afs") != 0) {
        int found = -1;
        int i;
        for (i = 0; i < MAXLOCALTOKENS; i++)
            if (local_tokens[i].valid) {
                if ((strcmp(local_tokens[i].server.name, aserver->name) == 0)
                    &&
                    (strcmp
                     (local_tokens[i].server.instance,
                      aserver->instance) == 0)
                    && (strcmp(local_tokens[i].server.cell, aserver->cell) ==
                        0)) {
                    found = i;  /* replace existing entry */
                    break;
                } else {
                    /* valid, but no match */
                }
            } else
                found = i;      /* remember this empty slot */
        if (found == -1)
            return KTC_NOENT;
        memcpy(&local_tokens[found].token, atoken, sizeof(struct ktc_token));
        local_tokens[found].server = *aserver;
        local_tokens[found].client = *aclient;
        local_tokens[found].valid = 1;
        return 0;
    }
    tp = tbuffer;               /* start copying here */
    if ((atoken->ticketLen < MINKTCTICKETLEN)
        || (atoken->ticketLen > MAXKTCTICKETLEN))
        return KTC_TOOBIG;
    memcpy(tp, &atoken->ticketLen, sizeof(afs_int32));  /* copy in ticket length */
    tp += sizeof(afs_int32);
    memcpy(tp, atoken->ticket, atoken->ticketLen);      /* copy in ticket */
    tp += atoken->ticketLen;
    /* next, copy in the "clear token", describing who we are */
    ct.AuthHandle = atoken->kvno;       /* hide auth handle here */
    memcpy(ct.HandShakeKey, &atoken->sessionKey, 8);

    ct.BeginTimestamp = atoken->startTime;
    ct.EndTimestamp = atoken->endTime;
    if (ct.BeginTimestamp == 0)
        ct.BeginTimestamp = 1;

    if ((strlen(aclient->name) > strlen("AFS ID "))
        && (aclient->instance[0] == 0)) {
        int sign = 1;
        afs_int32 viceId = 0;
        char *cp = aclient->name + strlen("AFS ID ");
        if (*cp == '-') {
            sign = -1;
            cp++;
        }
        while (*cp) {
            if (isdigit(*cp))
                viceId = viceId * 10 + (int)(*cp - '0');
            else
                goto not_vice_id;
            cp++;
        }
        ct.ViceId = viceId * sign;      /* OK to let any value here? */
        if (((ct.EndTimestamp - ct.BeginTimestamp) & 1) == 0)
            ct.BeginTimestamp++;        /* force lifetime to be odd */
    } else {
      not_vice_id:
        ct.ViceId = getuid();   /* wrong, but works in primary cell */
        if (((ct.EndTimestamp - ct.BeginTimestamp) & 1) == 1)
            ct.BeginTimestamp++;        /* force lifetime to be even */
    }

#ifdef UKERNEL
    /*
     * Information needed by the user space cache manager
     */
    get_user_struct()->u_expiration = ct.EndTimestamp;
    get_user_struct()->u_viceid = ct.ViceId;
#endif

    temp = sizeof(struct ClearToken);
    memcpy(tp, &temp, sizeof(afs_int32));
    tp += sizeof(afs_int32);
    memcpy(tp, &ct, sizeof(struct ClearToken));
    tp += sizeof(struct ClearToken);

    /* next copy in primary flag */
    temp = 0;

    /*
     * The following means that setpag will happen inside afs just before
     * the authentication to prevent the setpag/klog race condition.
     *
     * The following means that setpag will affect the parent process as
     * well as the current process.
     */
    if (flags & AFS_SETTOK_SETPAG)
        temp |= 0x8000;

    memcpy(tp, &temp, sizeof(afs_int32));
    tp += sizeof(afs_int32);

    /* finally copy in the cell name */
    temp = strlen(aserver->cell);
    if (temp >= MAXKTCREALMLEN)
        return KTC_TOOBIG;
    strcpy(tp, aserver->cell);
    tp += temp + 1;

    /* now setup for the pioctl */
    iob.in = tbuffer;
    iob.in_size = tp - tbuffer;
    iob.out = tbuffer;
    iob.out_size = sizeof(tbuffer);

#if defined(NO_AFS_CLIENT)
    {
        int fd;                 /* DEBUG */
        char *tkfile;
        if ((tkfile = getenv("TKTFILE"))
            &&
            ((fd =
              open(tkfile, O_WRONLY | O_APPEND | O_TRUNC | O_CREAT,
                   0644)) >= 0)) {
            printf("Writing ticket to: %s\n", tkfile);
            code = (write(fd, iob.in, iob.in_size) != iob.in_size);
            close(fd);
        } else
            code = KTC_PIOCTLFAIL;
    }
#else /* NO_AFS_CLIENT */
    code = PIOCTL(0, VIOCSETTOK, &iob, 0);
#endif /* NO_AFS_CLIENT */
    if (code)
        return KTC_PIOCTLFAIL;
    return 0;
}

int
ktc_SetTokenEx(struct ktc_setTokenData *token) {
    struct ViceIoctl iob;
    afs_int32 code;
    XDR xdrs;

    xdrlen_create(&xdrs);
    if (!xdr_ktc_setTokenData(&xdrs, token))
        return EINVAL;
    iob.in_size = xdr_getpos(&xdrs);
    xdr_destroy(&xdrs);

    iob.in = malloc(iob.in_size);
    if (iob.in == NULL)
        return ENOMEM;

    xdrmem_create(&xdrs, iob.in, iob.in_size, XDR_ENCODE);
    if (!xdr_ktc_setTokenData(&xdrs, token))
        return KTC_INVAL;
    xdr_destroy(&xdrs);

    iob.out = NULL;
    iob.out_size = 0;

    code = PIOCTL(0, VIOC_SETTOK2, &iob, 0);

    free(iob.in);

    /* If we can't use the new pioctl, then fallback to using the old
     * one, with just the rxkad portion of the token we're being asked to
     * set
     */
    if (code == -1 && errno == EINVAL) {
        struct ktc_principal server, client;
        struct ktc_token *rxkadToken;
        afs_int32 flags;

        /* With the growth of ticket sizes, a ktc_token is now 12k. Don't
         * allocate it on the stack! */
        rxkadToken = malloc(sizeof(*rxkadToken));
        if (rxkadToken == NULL)
            return ENOMEM;

        code = token_extractRxkad(token, rxkadToken, &flags, &client);
        if (code) {
            free(rxkadToken);
            return KTC_INVAL;
        }

        memset(&server, 0, sizeof(server));
        strcpy(server.name, "afs");
        if (strlcpy(server.cell, token->cell, sizeof(server.cell))
                >= sizeof(server.cell)) {
            free(rxkadToken);
            return KTC_INVAL;
        }
        code = ktc_SetToken(&server, rxkadToken, &client, flags);
        free(rxkadToken);
        return code;
    }

    if (code)
        return KTC_PIOCTLFAIL;
#if defined(AFS_LINUX26_ENV) && defined(SYS_keyctl)
    else
        /*
         * If we're using keyring based PAGs and the SESSION_TO_PARENT keyctl
         * is available, use it to copy the session keyring to the parent process
         */
        if (token->flags & AFS_SETTOK_SETPAG)
            syscall(SYS_keyctl, KEYCTL_SESSION_TO_PARENT);
#endif

    return 0;
}

int
ktc_SetToken(struct ktc_principal *aserver,
    struct ktc_token *atoken,
    struct ktc_principal *aclient,
    afs_int32 flags)
{
    int code;

    LOCK_GLOBAL_MUTEX;
#ifdef AFS_KERBEROS_ENV
    if (!lcell[0])
        ktc_LocalCell();

    if (                        /*!strcmp(aclient->cell, lcell) && this would only store local creds */
           (strcmp(aserver->name, "AuthServer")
            || strcmp(aserver->instance, "Admin"))) {
        if (strcmp(aserver->name, "krbtgt") == 0) {
            static char lrealm[MAXKTCREALMLEN];

            if (!lrealm[0])
                ucstring(lrealm, lcell, MAXKTCREALMLEN);
            if (strcmp(aserver->instance, lrealm) == 0) {
                afs_tf_create(aclient->name, aclient->instance);
            }
        }

        code = afs_tf_init(ktc_tkt_string(), W_TKT_FIL);
        if (code == NO_TKT_FIL) {
            (void)afs_tf_create(aclient->name, aclient->instance);
            code = afs_tf_init(ktc_tkt_string(), W_TKT_FIL);
        }

        if (!code) {
            afs_tf_save_cred(aserver, atoken, aclient);
        }
        afs_tf_close();
#ifdef NO_AFS_CLIENT
        UNLOCK_GLOBAL_MUTEX;
        return code;
#endif /* NO_AFS_CLIENT */
    }
#endif

#ifndef NO_AFS_CLIENT
    code = SetToken(aserver, atoken, aclient, flags);
    if (code) {
        UNLOCK_GLOBAL_MUTEX;
        if (code == -1)
            code = errno;
        else if (code == KTC_PIOCTLFAIL)
            code = errno;
        if (code == ESRCH)
            return KTC_NOCELL;
        if (code == EINVAL)
            return KTC_NOPIOCTL;
        if (code == EIO)
            return KTC_NOCM;
        return KTC_PIOCTLFAIL;
    }
#endif /* NO_AFS_CLIENT */
    UNLOCK_GLOBAL_MUTEX;
    return 0;
}

/*!
 * Get a token, given the cell that we need to get information for
 *
 * @param cellName
 *      The name of the cell we're getting the token for - if NULL, we'll
 *      get information for the primary cell
 */
int
ktc_GetTokenEx(char *cellName, struct ktc_setTokenData **tokenSet) {
    struct ViceIoctl iob;
    char tbuffer[MAXPIOCTLTOKENLEN];
    char *tp;
    afs_int32 code;
    XDR xdrs;

    tp = tbuffer;

    /* If we have a cellName, write it out here */
    if (cellName) {
        memcpy(tp, cellName, strlen(cellName) +1);
        tp += strlen(cellName)+1;
    }

    iob.in = tbuffer;
    iob.in_size = tp - tbuffer;
    iob.out = tbuffer;
    iob.out_size = sizeof(tbuffer);

    code = PIOCTL(0, VIOC_GETTOK2, &iob, 0);

    /* If we can't use the new pioctl, the fall back to the old one. We then
     * need to convert the rxkad token we get back into the new format
     */
    if (code == -1 && errno == EINVAL) {
        struct ktc_principal server;
        struct ktc_tokenUnion token;
        struct ktc_token *ktcToken; /* too huge for the stack */
        afs_int32 viceid;

        memset(&server, 0, sizeof(server));
        ktcToken = malloc(sizeof(struct ktc_token));
        if (ktcToken == NULL)
            return ENOMEM;
        memset(ktcToken, 0, sizeof(struct ktc_token));

        strcpy(server.name, "afs");

        if (cellName != NULL)
            strcpy(server.cell, cellName);

        code = GetToken(&server, ktcToken, sizeof(struct ktc_token),
                         NULL /*client*/, &viceid);
        if (code == 0) {
            *tokenSet = token_buildTokenJar(cellName);
            token.at_type = AFSTOKEN_UNION_KAD;
            token.ktc_tokenUnion_u.at_kad.rk_kvno = ktcToken->kvno;
            memcpy(token.ktc_tokenUnion_u.at_kad.rk_key,
                   ktcToken->sessionKey.data, 8);

            token.ktc_tokenUnion_u.at_kad.rk_begintime = ktcToken->startTime;
            token.ktc_tokenUnion_u.at_kad.rk_endtime   = ktcToken->endTime;
            token.ktc_tokenUnion_u.at_kad.rk_ticket.rk_ticket_len
                = ktcToken->ticketLen;
            token.ktc_tokenUnion_u.at_kad.rk_ticket.rk_ticket_val
                = ktcToken->ticket;
            token.ktc_tokenUnion_u.at_kad.rk_viceid = viceid;

            token_addToken(*tokenSet, &token);

            memset(ktcToken, 0, sizeof(struct ktc_token));
        }
        free(ktcToken);
        return code;
    }
    if (code)
        return KTC_PIOCTLFAIL;

    *tokenSet = malloc(sizeof(struct ktc_setTokenData));
    if (*tokenSet == NULL)
        return ENOMEM;
    memset(*tokenSet, 0, sizeof(struct ktc_setTokenData));

    xdrmem_create(&xdrs, iob.out, iob.out_size, XDR_DECODE);
    if (!xdr_ktc_setTokenData(&xdrs, *tokenSet)) {
        free(*tokenSet);
        *tokenSet = NULL;
        xdr_destroy(&xdrs);
        return EINVAL;
    }
    xdr_destroy(&xdrs);
    return 0;
}

/* get token, given server we need and token buffer.  aclient will eventually
 * be set to our identity to the server.
 */
int
ktc_GetToken(struct ktc_principal *aserver, struct ktc_token *atoken,
             int atokenLen, struct ktc_principal *aclient)
{
    return GetToken(aserver, atoken, atokenLen, aclient, NULL);
}

static int
GetToken(struct ktc_principal *aserver, struct ktc_token *atoken,
          int atokenLen, struct ktc_principal *aclient, afs_int32 *aviceid)
{
    struct ViceIoctl iob;
    char tbuffer[MAXPIOCTLTOKENLEN];
    afs_int32 code = 0;
    int index;
    char *stp, *cellp;          /* secret token ptr */
    struct ClearToken ct;
    char *tp;
    afs_int32 temp;
    int maxLen;                 /* biggest ticket we can copy */
    int tktLen;                 /* server ticket length */
#ifdef AFS_KERBEROS_ENV
    char found = 0;
#endif
    if (aviceid) {
        *aviceid = 0;
    }

    LOCK_GLOBAL_MUTEX;

#ifdef AFS_KERBEROS_ENV
    if (!lcell[0])
        ktc_LocalCell();
#endif
#ifndef NO_AFS_CLIENT
    if (strcmp(aserver->name, "afs") != 0)
#endif /* NO_AFS_CLIENT */
    {
        int i;
        /* try the local tokens */
        for (i = 0; i < MAXLOCALTOKENS; i++)
            if (local_tokens[i].valid
                && (strcmp(local_tokens[i].server.name, aserver->name) == 0)
                && (strcmp(local_tokens[i].server.instance, aserver->instance)
                    == 0)
                && (strcmp(local_tokens[i].server.cell, aserver->cell) == 0)) {
                memcpy(atoken, &local_tokens[i].token,
                       min(atokenLen, sizeof(struct ktc_token)));
                if (aclient)
                    *aclient = local_tokens[i].client;
                UNLOCK_GLOBAL_MUTEX;
                return 0;
            }
#ifdef AFS_KERBEROS_ENV
        if (!afs_tf_init(ktc_tkt_string(), R_TKT_FIL)) {
            if (aclient) {
                if (!afs_tf_get_pname(aclient->name)
                    && !afs_tf_get_pinst(aclient->instance))
                    found = 1;
            } else {
                char tmpstring[MAXHOSTCHARS];
                afs_tf_get_pname(tmpstring);
                afs_tf_get_pinst(tmpstring);
                found = 1;
            }
        }
        if (found) {
            struct ktc_principal cprincipal;
            struct ktc_token ctoken;

            while (!afs_tf_get_cred(&cprincipal, &ctoken)) {
                if (strcmp(cprincipal.name, aserver->name) == 0
                    && strcmp(cprincipal.instance, aserver->instance) == 0
                    && strcmp(cprincipal.cell, aserver->cell) == 0) {

                    if (aclient)
                        strcpy(aclient->cell, lcell);
                    memcpy(atoken, &ctoken,
                           min(atokenLen, sizeof(struct ktc_token)));

                    afs_tf_close();
                    UNLOCK_GLOBAL_MUTEX;
                    return 0;
                }
            }
        }
        afs_tf_close();
#endif
        UNLOCK_GLOBAL_MUTEX;
        return KTC_NOENT;
    }
#ifndef NO_AFS_CLIENT
    for (index = 0; index < 200; index++) {     /* sanity check in case pioctl fails */
        iob.in = (char *)&index;
        iob.in_size = sizeof(afs_int32);
        iob.out = tbuffer;
        iob.out_size = sizeof(tbuffer);

        code = PIOCTL(0, VIOCGETTOK, &iob, 0);

        if (code) {
            /* failed to retrieve specified token */
            if (code < 0 && errno == EDOM) {
                UNLOCK_GLOBAL_MUTEX;
                return KTC_NOENT;
            }
        } else {
            /* token retrieved; parse buffer */
            tp = tbuffer;

            /* get ticket length */
            memcpy(&temp, tp, sizeof(afs_int32));
            tktLen = temp;
            tp += sizeof(afs_int32);

            /* remember where ticket is and skip over it */
            stp = tp;
            tp += tktLen;

            /* get size of clear token and verify */
            memcpy(&temp, tp, sizeof(afs_int32));
            if (temp != sizeof(struct ClearToken)) {
                UNLOCK_GLOBAL_MUTEX;
                return KTC_ERROR;
            }
            tp += sizeof(afs_int32);

            /* copy clear token */
            memcpy(&ct, tp, temp);
            tp += temp;

            /* skip over primary flag */
            tp += sizeof(afs_int32);

            /* remember where cell name is */
            cellp = tp;

            if ((strcmp(cellp, aserver->cell) == 0)
#ifdef  AFS_KERBEROS_ENV
                || (*aserver->cell == '\0' && strcmp(cellp, lcell) == 0)
#endif
                ) {
                /* got token for cell; check that it will fit */
                maxLen =
                    atokenLen - sizeof(struct ktc_token) + MAXKTCTICKETLEN;
                if (tktLen < 0 || tktLen > maxLen) {
                    UNLOCK_GLOBAL_MUTEX;
                    return KTC_TOOBIG;
                }

                /* set return values */
                memcpy(atoken->ticket, stp, tktLen);
                atoken->startTime = ct.BeginTimestamp;
                atoken->endTime = ct.EndTimestamp;
                if (ct.AuthHandle == -1) {
                    ct.AuthHandle = 999;
                }
                atoken->kvno = ct.AuthHandle;
                memcpy(&atoken->sessionKey, ct.HandShakeKey,
                       sizeof(struct ktc_encryptionKey));
                atoken->ticketLen = tktLen;

                if (aclient || aviceid) {
                    if (aclient) {
                        strlcpy(aclient->cell, cellp, sizeof(aclient->cell));
                        aclient->instance[0] = 0;
                    }

                    if ((atoken->kvno == 999) ||        /* old style bcrypt ticket */
                        (ct.BeginTimestamp &&   /* new w/ prserver lookup */
                         (((ct.EndTimestamp - ct.BeginTimestamp) & 1) == 1))) {
                        if (aclient) {
                            sprintf(aclient->name, "AFS ID %d", ct.ViceId);
                        }
                        if (aviceid) {
                            *aviceid = ct.ViceId;
                        }
                    } else if (aclient) {
                        sprintf(aclient->name, "Unix UID %d", ct.ViceId);
                    }
                }
                UNLOCK_GLOBAL_MUTEX;
                return 0;
            }
        }
    }
#endif /* NO_AFS_CLIENT */

    UNLOCK_GLOBAL_MUTEX;
    if ((code < 0) && (errno == EINVAL))
        return KTC_NOPIOCTL;
    return KTC_PIOCTLFAIL;      /* probable cause */
}

/*
 * Forget tokens for this server and the calling user.
 * NOT IMPLEMENTED YET!
 */
#ifndef NO_AFS_CLIENT
int
ktc_ForgetToken(struct ktc_principal *aserver)
{
    int rc;

    LOCK_GLOBAL_MUTEX;
    rc = ktc_ForgetAllTokens(); /* bogus, but better */
    UNLOCK_GLOBAL_MUTEX;
    return rc;
}
#endif /* NO_AFS_CLIENT */

/*!
 * An iterator which can list all cells with tokens in the cache
 *
 * This function may be used to list the names of all cells for which
 * tokens exist in the current cache. The first time that it is called,
 * prevIndex should be set to 0. On all subsequent calls, prevIndex
 * should be set to the value returned in newIndex by the last call
 * to the function. Note that there is no guarantee that the index value
 * is monotonically increasing.
 *
 * @param prevIndex
 *      The index returned by the last call, or 0 if this is the first
 *      call in an iteration
 * @param newIndex
 *      A pointer to an int which, upon return, will hold the next value
 *      to be used.
 * @param cellName
 *      A pointer to a char * which, upon return, will hold a cellname.
 *      This must be freed by the caller using free()
 */

int
ktc_ListTokensEx(int prevIndex, int *newIndex, char **cellName) {
    struct ViceIoctl iob;
    char tbuffer[MAXPIOCTLTOKENLEN];
    afs_int32 code;
    afs_int32 index;
    struct ktc_setTokenData tokenSet;
    XDR xdrs;

    memset(&tokenSet, 0, sizeof(tokenSet));

    *cellName = NULL;
    *newIndex = prevIndex;

    index = prevIndex;

    while (index<100) { /* Safety, incase of pioctl failure */
        memset(tbuffer, 0, sizeof(tbuffer));
        iob.in = tbuffer;
        memcpy(tbuffer, &index, sizeof(afs_int32));
        iob.in_size = sizeof(afs_int32);
        iob.out = tbuffer;
        iob.out_size = sizeof(tbuffer);

        code = PIOCTL(0, VIOC_GETTOK2, &iob, 0);

        if (code == -1 && errno == EDOM)
            return KTC_NOENT;   /* no more tokens to be found */

        /* Can't use new pioctl, so must use old one */
        if (code == -1 && errno == EINVAL) {
            struct ktc_principal server;

            code = ktc_ListTokens(index, newIndex, &server);
            if (code == 0)
                *cellName = strdup(server.cell);
            return code;
        }

        if (code == 0) {
            /* Got a token from the pioctl. Now we throw it away,
             * so we can return just a cellname. This is rather wasteful,
             * but it's what the old API does. Ho hum.  */

            xdrmem_create(&xdrs, iob.out, iob.out_size, XDR_DECODE);
            if (!xdr_ktc_setTokenData(&xdrs, &tokenSet)) {
                xdr_destroy(&xdrs);
                return EINVAL;
            }
            xdr_destroy(&xdrs);
            *cellName = strdup(tokenSet.cell);
            xdr_free((xdrproc_t)xdr_ktc_setTokenData, &tokenSet);
            *newIndex = index + 1;
            return 0;
        }
        index++;
    }
    return KTC_PIOCTLFAIL;
}

/* ktc_ListTokens - list all tokens.  start aprevIndex at 0, it returns the
 * next rock in (*aindex).  (*aserver) is set to the relevant ticket on
 * success.  */

int
ktc_ListTokens(int aprevIndex,
    int *aindex,
    struct ktc_principal *aserver)
{
    struct ViceIoctl iob;
    char tbuffer[MAXPIOCTLTOKENLEN];
    afs_int32 code = 0 ;
    char *tp;
    afs_int32 temp, index;

    memset(tbuffer, 0, sizeof(tbuffer));

    LOCK_GLOBAL_MUTEX;

    index = aprevIndex;
#ifdef NO_AFS_CLIENT
    if (index < 214)
        index = 214;
#endif /* NO_AFS_CLIENT */
#ifdef AFS_KERBEROS_ENV
    if (index >= 214) {
        int i;
        struct ktc_principal cprincipal;
        struct ktc_token ctoken;

        if (afs_tf_init(ktc_tkt_string(), R_TKT_FIL)
            || afs_tf_get_pname(tbuffer) || afs_tf_get_pinst(tbuffer)) {
            afs_tf_close();
            UNLOCK_GLOBAL_MUTEX;
            return KTC_NOENT;
        }

        for (i = 214; i < index; i++) {
            if (afs_tf_get_cred(&cprincipal, &ctoken)) {
                afs_tf_close();
                UNLOCK_GLOBAL_MUTEX;
                return KTC_NOENT;
            }
        }

      again:
        if (afs_tf_get_cred(&cprincipal, &ctoken)) {
            afs_tf_close();
            UNLOCK_GLOBAL_MUTEX;
            return KTC_NOENT;
        }
        index++;

#ifndef NO_AFS_CLIENT
        if (!strcmp(cprincipal.name, "afs") && cprincipal.instance[0] == 0) {
            goto again;
        }
#endif /* NO_AFS_CLIENT */

        for (i = 0; i < MAXLOCALTOKENS; i++) {
            if (!strcmp(cprincipal.name, local_tokens[i].server.name)
                && !strcmp(cprincipal.instance,
                           local_tokens[i].server.instance)
                && !strcmp(cprincipal.cell, local_tokens[i].server.cell)) {
                goto again;
            }
        }

        *aserver = cprincipal;
        *aindex = index;
        afs_tf_close();
        UNLOCK_GLOBAL_MUTEX;
        return 0;
    }
#endif

#ifndef NO_AFS_CLIENT
    if (index >= 123) {         /* special hack for returning TCS */
        while (index - 123 < MAXLOCALTOKENS) {
            if (local_tokens[index - 123].valid) {
                *aserver = local_tokens[index - 123].server;
                *aindex = index + 1;
                UNLOCK_GLOBAL_MUTEX;
                return 0;
            }
            index++;
        }
        UNLOCK_GLOBAL_MUTEX;
#ifdef AFS_KERBEROS_ENV
        return ktc_ListTokens(214, aindex, aserver);
#else
        return KTC_NOENT;
#endif
    }

    /* get tokens from the kernel */
    while (index < 200) {       /* sanity check in case pioctl fails */
        iob.in = (char *)&index;
        iob.in_size = sizeof(afs_int32);
        iob.out = tbuffer;
        iob.out_size = sizeof(tbuffer);
        code = PIOCTL(0, VIOCGETTOK, &iob, 0);
        if (code < 0 && errno == EDOM) {
            if (index < 123) {
                int rc;
                rc = ktc_ListTokens(123, aindex, aserver);
                UNLOCK_GLOBAL_MUTEX;
                return rc;
            } else {
                UNLOCK_GLOBAL_MUTEX;
                return KTC_NOENT;
            }
        }
        if (code == 0)
            break;              /* got a ticket */
        /* otherwise we should skip this ticket slot */
        index++;
    }
    if (code < 0) {
        UNLOCK_GLOBAL_MUTEX;
        if (errno == EINVAL)
            return KTC_NOPIOCTL;
        return KTC_PIOCTLFAIL;
    }

    /* parse buffer */
    tp = tbuffer;

    /* next iterator determined by earlier loop */
    *aindex = index + 1;

    memcpy(&temp, tp, sizeof(afs_int32));       /* get size of secret token */
    tp += sizeof(afs_int32);
    tp += temp;                 /* skip ticket for now */
    memcpy(&temp, tp, sizeof(afs_int32));       /* get size of clear token */
    if (temp != sizeof(struct ClearToken)) {
        UNLOCK_GLOBAL_MUTEX;
        return KTC_ERROR;
    }
    tp += sizeof(afs_int32);    /* skip length */
    tp += temp;                 /* skip clear token itself */
    tp += sizeof(afs_int32);    /* skip primary flag */
    /* tp now points to the cell name */
    strlcpy(aserver->cell, tp, sizeof(aserver->cell));
    aserver->instance[0] = 0;
    strcpy(aserver->name, "afs");
#endif /* NO_AFS_CLIENT */
    UNLOCK_GLOBAL_MUTEX;
    return 0;
}

static int
ForgetAll(void)
{
    struct ViceIoctl iob;
    afs_int32 code;
    int i;

    for (i = 0; i < MAXLOCALTOKENS; i++)
        local_tokens[i].valid = 0;

    iob.in = 0;
    iob.in_size = 0;
    iob.out = 0;
    iob.out_size = 0;
#ifndef NO_AFS_CLIENT
    code = PIOCTL(0, VIOCUNPAG, &iob, 0);
    if (code)
        return KTC_PIOCTLFAIL;
#endif /* NO_AFS_CLIENT */
    return 0;
}

int
ktc_ForgetAllTokens(void)
{
    int ocode;

    LOCK_GLOBAL_MUTEX;
#ifdef AFS_KERBEROS_ENV
    (void)afs_tf_dest_tkt();
#endif

    ocode = ForgetAll();
    if (ocode) {
        if (ocode == -1)
            ocode = errno;
        else if (ocode == KTC_PIOCTLFAIL)
            ocode = errno;
        UNLOCK_GLOBAL_MUTEX;
        if (ocode == EINVAL)
            return KTC_NOPIOCTL;
        return KTC_PIOCTLFAIL;
    }
    UNLOCK_GLOBAL_MUTEX;
    return 0;
}

/* ktc_OldPioctl - returns a boolean true if the kernel supports only the old
 * pioctl interface for delivering AFS tickets to the cache manager. */

int
ktc_OldPioctl(void)
{
    return 1;
}

afs_uint32
ktc_curpag(void)
{
    int code;
    struct ViceIoctl iob;
    afs_uint32 pag;

    /* now setup for the pioctl */
    iob.in = NULL;
    iob.in_size = 0;
    iob.out = (caddr_t) &pag;
    iob.out_size = sizeof(afs_uint32);

    code = PIOCTL(0, VIOC_GETPAG, &iob, 0);
    if (code < 0) {
#if defined(AFS_AIX52_ENV)
        code = getpagvalue("afs");
        if (code < 0 && errno == EINVAL)
            code = 0;
        return code;
#elif defined(AFS_AIX51_ENV)
        return -1;
#else
        gid_t groups[NGROUPS_MAX];
        afs_uint32 g0, g1;
        afs_uint32 h, l, ret;
        int ngroups;
#ifdef AFS_PAG_ONEGROUP_ENV
        int i;
#endif

        ngroups = getgroups(sizeof groups / sizeof groups[0], groups);

#ifdef AFS_PAG_ONEGROUP_ENV
        /* Check for one-group PAGs. */
        for (i = 0; i < ngroups; i++) {
            if (((groups[i] >> 24) & 0xff) == 'A') {
                return groups[i];
            }
        }
#endif

        if (ngroups < 2)
            return 0;

        g0 = groups[0] & 0xffff;
        g1 = groups[1] & 0xffff;
        g0 -= 0x3f00;
        g1 -= 0x3f00;
        if (g0 < 0xc000 && g1 < 0xc000) {
            l = ((g0 & 0x3fff) << 14) | (g1 & 0x3fff);
            h = (g0 >> 14);
            h = (g1 >> 14) + h + h + h;
            ret = ((h << 28) | l);
            /* Additional testing */
            if (((ret >> 24) & 0xff) == 'A')
                return ret;
            else
                return -1;
        }
        return -1;
#endif
    }
    return pag;
}


#ifdef AFS_KERBEROS_ENV
 /*
  * Copyright 1987, 1988 by the Massachusetts Institute of Technology.
  *
  * For copying and distribution information, please see the file
  * <mit-copyright.h>.
  */

#if 0
#include <sys/file.h>
#include <krb.h>
#endif

#define TOO_BIG -1
#define TF_LCK_RETRY ((unsigned)2)      /* seconds to sleep before
                                         * retry if ticket file is
                                         * locked */

/*
 * fd must be initialized to something that won't ever occur as a real
 * file descriptor. Since open(2) returns only non-negative numbers as
 * valid file descriptors, and afs_tf_init always stuffs the return value
 * from open in here even if it is an error flag, we must
 *      a. Initialize fd to a negative number, to indicate that it is
 *         not initially valid.
 *      b. When checking for a valid fd, assume that negative values
 *         are invalid (ie. when deciding whether afs_tf_init has been
 *         called.)
 *      c. In tf_close, be sure it gets reinitialized to a negative
 *         number.
 */
static int fd = -1;
static int curpos;                      /* Position in tfbfr */
static int lastpos;                     /* End of tfbfr */
static char tfbfr[BUFSIZ];      /* Buffer for ticket data */

static int tf_gets(char *, int);
static int tf_read(char *, int);

/*
 * This file contains routines for manipulating the ticket cache file.
 *
 * The ticket file is in the following format:
 *
 *      principal's name        (null-terminated string)
 *      principal's instance    (null-terminated string)
 *      CREDENTIAL_1
 *      CREDENTIAL_2
 *      ...
 *      CREDENTIAL_n
 *      EOF
 *
 *      Where "CREDENTIAL_x" consists of the following fixed-length
 *      fields from the CREDENTIALS structure (see "krb.h"):
 *
 *              char            service[MAXKTCNAMELEN]
 *              char            instance[MAXKTCNAMELEN]
 *              char            realm[REALM_SZ]
 *              C_Block         session
 *              int             lifetime
 *              int             kvno
 *              KTEXT_ST        ticket_st
 *              afs_int32            issue_date
 *
 * Short description of routines:
 *
 * afs_tf_init() opens the ticket file and locks it.
 *
 * afs_tf_get_pname() returns the principal's name.
 *
 * afs_tf_get_pinst() returns the principal's instance (may be null).
 *
 * afs_tf_get_cred() returns the next CREDENTIALS record.
 *
 * afs_tf_save_cred() appends a new CREDENTIAL record to the ticket file.
 *
 * afs_tf_close() closes the ticket file and releases the lock.
 *
 * tf_gets() returns the next null-terminated string.  It's an internal
 * routine used by afs_tf_get_pname(), afs_tf_get_pinst(), and
 * afs_tf_get_cred().
 *
 * tf_read() reads a given number of bytes.  It's an internal routine
 * used by afs_tf_get_cred().
 */

/*
 * afs_tf_init() should be called before the other ticket file routines.
 * It takes the name of the ticket file to use, "tf_name", and a
 * read/write flag "rw" as arguments.
 *
 * It tries to open the ticket file, checks the mode, and if everything
 * is okay, locks the file.  If it's opened for reading, the lock is
 * shared.  If it's opened for writing, the lock is exclusive.
 *
 * Returns 0 if all went well, otherwise one of the following:
 *
 * NO_TKT_FIL   - file wasn't there
 * TKT_FIL_ACC  - file was in wrong mode, etc.
 * TKT_FIL_LCK  - couldn't lock the file, even after a retry
 */

int
afs_tf_init(char *tf_name, int rw)
{
    int wflag;
    int me;
    struct stat stat_buf;

    switch (rw) {
    case R_TKT_FIL:
        wflag = 0;
        break;
    case W_TKT_FIL:
        wflag = 1;
        break;
    default:
        return TKT_FIL_ACC;
    }
    if (lstat(tf_name, &stat_buf) < 0)
        switch (errno) {
        case ENOENT:
            return NO_TKT_FIL;
        default:
            return TKT_FIL_ACC;
        }
    me = getuid();
    if ((stat_buf.st_uid != me && me != 0)
        || ((stat_buf.st_mode & S_IFMT) != S_IFREG))
        return TKT_FIL_ACC;

    /*
     * If "wflag" is set, open the ticket file in append-writeonly mode
     * and lock the ticket file in exclusive mode.  If unable to lock
     * the file, sleep and try again.  If we fail again, return with the
     * proper error message.
     */

    curpos = sizeof(tfbfr);

    if (wflag) {
        fd = open(tf_name, O_RDWR, 0600);
        if (fd < 0) {
            return TKT_FIL_ACC;
        }
#if defined(AFS_AIX_ENV) || defined(AFS_HPUX_ENV) || defined(AFS_SUN5_ENV)
        if (fcntl(fd, F_SETLK, &fileWlock) == -1) {
            sleep(TF_LCK_RETRY);
            if (fcntl(fd, F_SETLK, &fileWlock) == -1) {
#else
        if (flock(fd, LOCK_EX | LOCK_NB) < 0) {
            sleep(TF_LCK_RETRY);
            if (flock(fd, LOCK_EX | LOCK_NB) < 0) {
#endif
                (void)close(fd);
                fd = -1;
                return TKT_FIL_LCK;
            }
        }
        return 0;
    }
    /*
     * Otherwise "wflag" is not set and the ticket file should be opened
     * for read-only operations and locked for shared access.
     */

    fd = open(tf_name, O_RDONLY, 0600);
    if (fd < 0) {
        return TKT_FIL_ACC;
    }
#if defined(AFS_AIX_ENV) || defined(AFS_HPUX_ENV) || defined(AFS_SUN5_ENV)
    if (fcntl(fd, F_SETLK, &fileRlock) == -1) {
        sleep(TF_LCK_RETRY);
        if (fcntl(fd, F_SETLK, &fileRlock) == -1) {
#else
    if (flock(fd, LOCK_SH | LOCK_NB) < 0) {
        sleep(TF_LCK_RETRY);
        if (flock(fd, LOCK_SH | LOCK_NB) < 0) {
#endif
            (void)close(fd);
            fd = -1;
            return TKT_FIL_LCK;
        }
    }
    return 0;
}

/*
 * afs_tf_get_pname() reads the principal's name from the ticket file. It
 * should only be called after afs_tf_init() has been called.  The
 * principal's name is filled into the "p" parameter.  If all goes well,
 * 0 is returned.  If afs_tf_init() wasn't called, TKT_FIL_INI is
 * returned.  If the name was null, or EOF was encountered, or the name
 * was longer than MAXKTCNAMELEN, TKT_FIL_FMT is returned.
 */

int
afs_tf_get_pname(char *p)
{
    if (fd < 0) {
        return TKT_FIL_INI;
    }
    if (tf_gets(p, MAXKTCNAMELEN) < 2)  /* can't be just a null */
        return TKT_FIL_FMT;
    return 0;
}

/*
 * afs_tf_get_pinst() reads the principal's instance from a ticket file.
 * It should only be called after afs_tf_init() and afs_tf_get_pname() have
 * been called.  The instance is filled into the "inst" parameter.  If all
 * goes well, 0 is returned.  If afs_tf_init() wasn't called,
 * TKT_FIL_INI is returned.  If EOF was encountered, or the instance
 * was longer than MAXKTCNAMELEN, TKT_FIL_FMT is returned.  Note that the
 * instance may be null.
 */

int
afs_tf_get_pinst(char *inst)
{
    if (fd < 0) {
        return TKT_FIL_INI;
    }
    if (tf_gets(inst, MAXKTCNAMELEN) < 1)
        return TKT_FIL_FMT;
    return 0;
}

/*
 * afs_tf_get_cred() reads a CREDENTIALS record from a ticket file and fills
 * in the given structure "c".  It should only be called after afs_tf_init(),
 * afs_tf_get_pname(), and afs_tf_get_pinst() have been called. If all goes
 * well, 0 is returned.  Possible error codes are:
 *
 * TKT_FIL_INI  - afs_tf_init wasn't called first
 * TKT_FIL_FMT  - bad format
 * EOF          - end of file encountered
 */

int
afs_tf_get_cred(struct ktc_principal *principal, struct ktc_token *token)
{
    int k_errno;
    int kvno, lifetime;
    long mit_compat;            /* MIT Kerberos 5 with Krb4 uses a "long" for issue_date */

    if (fd < 0) {
        return TKT_FIL_INI;
    }
    if ((k_errno = tf_gets(principal->name, MAXKTCNAMELEN)) < 2)
        switch (k_errno) {
        case TOO_BIG:
        case 1:         /* can't be just a null */
            return TKT_FIL_FMT;
        case 0:
            return EOF;
        }
    if ((k_errno = tf_gets(principal->instance, MAXKTCNAMELEN)) < 1)
        switch (k_errno) {
        case TOO_BIG:
            return TKT_FIL_FMT;
        case 0:
            return EOF;
        }
    if ((k_errno = tf_gets(principal->cell, MAXKTCREALMLEN)) < 2)
        switch (k_errno) {
        case TOO_BIG:
        case 1:         /* can't be just a null */
            return TKT_FIL_FMT;
        case 0:
            return EOF;
        }
    lcstring(principal->cell, principal->cell, MAXKTCREALMLEN);
    if (tf_read((char *)&(token->sessionKey), 8) < 1
        || tf_read((char *)&(lifetime), sizeof(lifetime)) < 1
        || tf_read((char *)&(kvno), sizeof(kvno)) < 1
        || tf_read((char *)&(token->ticketLen), sizeof(token->ticketLen))
        < 1 ||
        /* don't try to read a silly amount into ticket->dat */
        token->ticketLen > MAXKTCTICKETLEN
        || tf_read((char *)(token->ticket), token->ticketLen) < 1
        || tf_read((char *)&mit_compat, sizeof(mit_compat)) < 1) {
        return TKT_FIL_FMT;
    }
    token->startTime = mit_compat;
    token->endTime = life_to_time(token->startTime, lifetime);
    token->kvno = kvno;
    return 0;
}

/*
 * tf_close() closes the ticket file and sets "fd" to -1. If "fd" is
 * not a valid file descriptor, it just returns.  It also clears the
 * buffer used to read tickets.
 *
 * The return value is not defined.
 */

int
afs_tf_close(void)
{
    if (!(fd < 0)) {
#if defined(AFS_AIX_ENV) || defined(AFS_HPUX_ENV) || defined(AFS_SUN5_ENV)
        (void)fcntl(fd, F_SETLK, &fileUlock);
#else
        (void)flock(fd, LOCK_UN);
#endif
        (void)close(fd);
        fd = -1;                /* see declaration of fd above */
    }
    memset(tfbfr, 0, sizeof(tfbfr));
    return 0;
}

/*
 * tf_gets() is an internal routine.  It takes a string "s" and a count
 * "n", and reads from the file until either it has read "n" characters,
 * or until it reads a null byte. When finished, what has been read exists
 * in "s".
 *
 * Possible return values are:
 *
 * n            the number of bytes read (including null terminator)
 *              when all goes well
 *
 * 0            end of file or read error
 *
 * TOO_BIG      if "count" characters are read and no null is
 *              encountered. This is an indication that the ticket
 *              file is seriously ill.
 */

static int
tf_gets(char *s, int n)
{
    int count;

    if (fd < 0) {
        return TKT_FIL_INI;
    }
    for (count = n - 1; count > 0; --count) {
        if (curpos >= sizeof(tfbfr)) {
            lastpos = read(fd, tfbfr, sizeof(tfbfr));
            curpos = 0;
        }
        if (curpos == lastpos) {
            return 0;
        }
        *s = tfbfr[curpos++];
        if (*s++ == '\0')
            return (n - count);
    }
    return TOO_BIG;
}

/*
 * tf_read() is an internal routine.  It takes a string "s" and a count
 * "n", and reads from the file until "n" bytes have been read.  When
 * finished, what has been read exists in "s".
 *
 * Possible return values are:
 *
 * n            the number of bytes read when all goes well
 *
 * 0            on end of file or read error
 */

static int
tf_read(char *s, int n)
{
    int count;

    for (count = n; count > 0; --count) {
        if (curpos >= sizeof(tfbfr)) {
            lastpos = read(fd, tfbfr, sizeof(tfbfr));
            curpos = 0;
        }
        if (curpos == lastpos) {
            return 0;
        }
        *s++ = tfbfr[curpos++];
    }
    return n;
}

/*
 * afs_tf_save_cred() appends an incoming ticket to the end of the ticket
 * file.  You must call afs_tf_init() before calling afs_tf_save_cred().
 *
 * The "service", "instance", and "realm" arguments specify the
 * server's name; "aticket" contains the credential.
 *
 * Returns 0 if all goes well, TKT_FIL_INI if afs_tf_init() wasn't
 * called previously, and KFAILURE for anything else that went wrong.
 */

int
afs_tf_save_cred(struct ktc_principal *aserver,
                 struct ktc_token *atoken,
                 struct ktc_principal *aclient)
{
    char realm[MAXKTCREALMLEN + 1];
    char junk[MAXKTCNAMELEN];
    struct ktc_principal principal;
    struct ktc_token token;
    int status;
    off_t start;
    int lifetime, kvno;
    int count;                  /* count for write */
    long mit_compat;            /* MIT Kerberos 5 with Krb4 uses a "long" for issue_date */

    if (fd < 0) {               /* fd is ticket file as set by afs_tf_init */
        return TKT_FIL_INI;
    }

    ucstring(realm, aserver->cell, MAXKTCREALMLEN);
    realm[MAXKTCREALMLEN] = '\0';

    /* Look for a duplicate ticket */
    (void)lseek(fd, (off_t) 0L, 0);
    curpos = sizeof(tfbfr);

    if (afs_tf_get_pname(junk) || strcmp(junk, aclient->name)
        || afs_tf_get_pinst(junk) || strcmp(junk, aclient->instance))
        goto bad;

    do {
        start = lseek(fd, (off_t) 0L, 1) - lastpos + curpos;
        status = afs_tf_get_cred(&principal, &token);
    } while (status == 0
             && (strcmp(aserver->name, principal.name) != 0
                 || strcmp(aserver->instance, principal.instance) != 0
                 || strcmp(aserver->cell, principal.cell) != 0));

    /*
     * Two tickets for the same user authenticating to the same service
     * should be the same length, but we check here just to make sure.
     */
    if (status == 0 && token.ticketLen != atoken->ticketLen)
        return KFAILURE;
    if (status && status != EOF)
        return status;

    /* Position over the credential we just matched (or the EOF) */
    lseek(fd, start, 0);
    curpos = lastpos = sizeof(tfbfr);

    /* Write the ticket and associated data */
    /* Service */
    count = strlen(aserver->name) + 1;
    if (write(fd, aserver->name, count) != count)
        goto bad;
    /* Instance */
    count = strlen(aserver->instance) + 1;
    if (write(fd, aserver->instance, count) != count)
        goto bad;
    /* Realm */
    count = strlen(realm) + 1;
    if (write(fd, realm, count) != count)
        goto bad;
    /* Session key */
    if (write(fd, (char *)&atoken->sessionKey, 8) != 8)
        goto bad;
    /* Lifetime */
    lifetime = time_to_life(atoken->startTime, atoken->endTime);
    if (write(fd, (char *)&lifetime, sizeof(int)) != sizeof(int))
        goto bad;
    /* Key vno */
    kvno = atoken->kvno;
    if (write(fd, (char *)&kvno, sizeof(int)) != sizeof(int))
        goto bad;
    /* Tkt length */
    if (write(fd, (char *)&(atoken->ticketLen), sizeof(int)) != sizeof(int))
        goto bad;
    /* Ticket */
    count = atoken->ticketLen;
    if (write(fd, atoken->ticket, count) != count)
        goto bad;
    /* Issue date */
    mit_compat = atoken->startTime;
    if (write(fd, (char *)&mit_compat, sizeof(mit_compat))
        != sizeof(mit_compat))
        goto bad;

    /* Actually, we should check each write for success */
    return (0);
  bad:
    return (KFAILURE);
}

/*
 * Copyright 1985, 1986, 1987, 1988 by the Massachusetts Institute
 * of Technology.
 *
 * For copying and distribution information, please see the file
 * <mit-copyright.h>.
 */

/*
 * This routine is used to generate the name of the file that holds
 * the user's cache of server tickets and associated session keys.
 *
 * If it is set, krb_ticket_string contains the ticket file name.
 * Otherwise, the filename is constructed as follows:
 *
 * If it is set, the environment variable "KRBTKFILE" will be used as
 * the ticket file name.  Otherwise TKT_ROOT (defined in "krb.h") and
 * the user's uid are concatenated to produce the ticket file name
 * (e.g., "/tmp/tkt123").  A pointer to the string containing the ticket
 * file name is returned.
 */

static char krb_ticket_string[4096] = "";

char *
ktc_tkt_string(void)
{
    return ktc_tkt_string_uid(getuid());
}

char *
ktc_tkt_string_uid(afs_uint32 uid)
{
    char *env;

    LOCK_GLOBAL_MUTEX;
    if (!*krb_ticket_string) {
        if ((env = getenv("KRBTKFILE"))) {
            (void)strncpy(krb_ticket_string, env,
                          sizeof(krb_ticket_string) - 1);
            krb_ticket_string[sizeof(krb_ticket_string) - 1] = '\0';
        } else {
            /* 32 bits of signed integer will always fit in 11 characters
             * (including the sign), so no need to worry about overflow */
            (void)sprintf(krb_ticket_string, "%s%d", TKT_ROOT, uid);
        }
    }
    UNLOCK_GLOBAL_MUTEX;
    return krb_ticket_string;
}

/*
 * This routine is used to set the name of the file that holds the user's
 * cache of server tickets and associated session keys.
 *
 * The value passed in is copied into local storage.
 *
 * NOTE:  This routine should be called during initialization, before other
 * Kerberos routines are called; otherwise tkt_string() above may be called
 * and return an undesired ticket file name until this routine is called.
 */

void
ktc_set_tkt_string(char * val)
{

    LOCK_GLOBAL_MUTEX;
    (void)strncpy(krb_ticket_string, val, sizeof(krb_ticket_string) - 1);
    krb_ticket_string[sizeof(krb_ticket_string) - 1] = '\0';
    UNLOCK_GLOBAL_MUTEX;
    return;
}

/*
 * tf_create() is used to initialize the ticket store.  It creates the
 * file to contain the tickets and writes the given user's name "pname"
 * and instance "pinst" in the file.  in_tkt() returns KSUCCESS on
 * success, or KFAILURE if something goes wrong.
 */

int
afs_tf_create(char *pname, char *pinst)
{
    int tktfile;
    int me, metoo;
    int count;
    char *file = ktc_tkt_string();
    int fd;
    int i;
    char zerobuf[1024];
    struct stat sbuf;

    me = getuid();
    metoo = geteuid();

    if (lstat(file, &sbuf) == 0) {
        if ((sbuf.st_uid != me && me != 0)
            || ((sbuf.st_mode & S_IFMT) != S_IFREG) || sbuf.st_mode & 077) {
            return KFAILURE;
        }
        /* file already exists, and permissions appear ok, so nuke it */
        if ((fd = open(file, O_RDWR, 0)) < 0)
            goto out;           /* can't zero it, but we can still try truncating it */

        memset(zerobuf, 0, sizeof(zerobuf));

        for (i = 0; i < sbuf.st_size; i += sizeof(zerobuf))
            if (write(fd, zerobuf, sizeof(zerobuf)) != sizeof(zerobuf)) {
                (void)fsync(fd);
                (void)close(fd);
                goto out;
            }

        (void)fsync(fd);
        (void)close(fd);
    }

  out:
    /* arrange so the file is owned by the ruid
     * (swap real & effective uid if necessary).
     * This isn't a security problem, since the ticket file, if it already
     * exists, has the right uid (== ruid) and mode. */
    if (me != metoo) {
        if (setreuid(metoo, me) < 0) {
            return (KFAILURE);
        }
    }
    tktfile = creat(file, 0600);
    if (me != metoo) {
        if (setreuid(me, metoo) < 0) {
            /* can't switch??? fail! */
            return (KFAILURE);
        }
    }
    if (tktfile < 0) {
        return (KFAILURE);
    }
    count = strlen(pname) + 1;
    if (write(tktfile, pname, count) != count) {
        (void)close(tktfile);
        return (KFAILURE);
    }
    count = strlen(pinst) + 1;
    if (write(tktfile, pinst, count) != count) {
        (void)close(tktfile);
        return (KFAILURE);
    }
    (void)close(tktfile);
    return (KSUCCESS);
}

/*
 * dest_tkt() is used to destroy the ticket store upon logout.
 * If the ticket file does not exist, dest_tkt() returns RET_TKFIL.
 * Otherwise the function returns 0 on success, KFAILURE on
 * failure.
 */

int
afs_tf_dest_tkt(void)
{
    char *file = ktc_tkt_string();
    int i, fd;
    struct stat statb;
    char buf[BUFSIZ];

    errno = 0;
    if (lstat(file, &statb) < 0)
        goto out;

    if (!(statb.st_mode & S_IFREG))
        goto out;

    if ((fd = open(file, O_RDWR, 0)) < 0)
        goto out;

    memset(buf, 0, BUFSIZ);

    for (i = 0; i < statb.st_size; i += BUFSIZ)
        if (write(fd, buf, BUFSIZ) != BUFSIZ) {
            (void)fsync(fd);
            (void)close(fd);
            goto out;
        }

    (void)fsync(fd);
    (void)close(fd);

    (void)unlink(file);

  out:
    if (errno == ENOENT)
        return RET_TKFIL;
    else if (errno != 0)
        return KFAILURE;
    return 0;
}

int
ktc_newpag(void)
{
#if !defined(AFS_DARWIN100_ENV) || defined(HAVE_CRT_EXTERNS_H)
# if defined(AFS_DARWIN100_ENV)
#  define environ (*_NSGetEnviron())
# else
extern char **environ;
# endif

    afs_uint32 pag;
    struct stat sbuf;
    char fname[256], *prefix = "/ticket/";
    char fname5[256], *prefix5 = "FILE:/ticket/krb5cc_";
    int numenv;
    char **newenv, **senv, **denv;

    LOCK_GLOBAL_MUTEX;
    if (stat("/ticket", &sbuf) == -1) {
        prefix = "/tmp/tkt";
        prefix5 = "FILE:/tmp/krb5cc_";
    }

    pag = ktc_curpag() & 0xffffffff;
    if (pag == -1) {
        sprintf(fname, "%s%d", prefix, getuid());
        sprintf(fname5, "%s%d", prefix5, getuid());
    } else {
        sprintf(fname, "%sp%lu", prefix, afs_printable_uint32_lu(pag));
        sprintf(fname5, "%sp%lud", prefix5, afs_printable_uint32_lu(pag));
    }
    ktc_set_tkt_string(fname);

    for (senv = environ, numenv = 0; *senv; senv++)
        numenv++;
    newenv = malloc((numenv + 2) * sizeof(char *));

    for (senv = environ, denv = newenv; *senv; senv++) {
        if (strncmp(*senv, "KRBTKFILE=", 10) != 0 &&
            strncmp(*senv, "KRB5CCNAME=", 11) != 0)
            *denv++ = *senv;
    }

    *denv = malloc(10+11 + strlen(fname) + strlen(fname5) + 2);
    strcpy(*denv, "KRBTKFILE=");
    strcat(*denv, fname);
    *(denv+1) = *denv + strlen(*denv) + 1;
    denv++;
    strcpy(*denv, "KRB5CCNAME=");
    strcat(*denv, fname5);
    *++denv = 0;
    environ = newenv;
    UNLOCK_GLOBAL_MUTEX;
#endif
    return 0;
}

/*
 * BLETCH!  We have to invoke the entire afsconf package just to
 * find out what the local cell is.
 */
static void
ktc_LocalCell(void)
{
    int code = 0;
    struct afsconf_dir *conf;

    if ((conf = afsconf_Open(AFSDIR_CLIENT_ETC_DIRPATH))
        || (conf = afsconf_Open(AFSDIR_SERVER_ETC_DIRPATH))) {
        code = afsconf_GetLocalCell(conf, lcell, sizeof(lcell));
        afsconf_Close(conf);
    }
    if (!conf || code) {
        printf("** Can't determine local cell name!\n");
    }
}

#endif