File: auth.c

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/*
 * Copyright (c) 1990,1993 Regents of The University of Michigan.
 * All Rights Reserved.  See COPYRIGHT.
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif /* HAVE_CONFIG_H */

#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/param.h>
#include <sys/stat.h>
#include <arpa/inet.h>

#include <atalk/afp.h>
#include <atalk/compat.h>
#include <atalk/util.h>
#include <limits.h>
#include <string.h>
#include <ctype.h>
#include <time.h>
#include <pwd.h>
#include <grp.h>

#ifdef TRU64
#include <netdb.h>
#include <arpa/inet.h>
#include <sia.h>
#include <siad.h>

extern void afp_get_cmdline( int *ac, char ***av );
#endif /* TRU64 */

#include <atalk/logger.h>
#include <atalk/server_ipc.h>
#include <atalk/uuid.h>
#include <atalk/globals.h>
#include <atalk/fce_api.h>
#include <atalk/spotlight.h>
#include <atalk/unix.h>

#include "auth.h"
#include "uam_auth.h"
#include "switch.h"
#include "status.h"
#include "fork.h"
#include "extattrs.h"
#ifdef HAVE_ACLS
#include "acls.h"
#endif

static int afp_version_index;
static struct uam_mod uam_modules = {NULL, NULL, &uam_modules, &uam_modules};
static struct uam_obj uam_login = {"", "", 0, {{NULL, NULL, NULL, NULL }}, &uam_login,
                                   &uam_login};
static struct uam_obj uam_changepw = {"", "", 0, {{NULL, NULL, NULL, NULL}}, &uam_changepw,
                                      &uam_changepw};

static struct uam_obj *afp_uam = NULL;


void status_versions( char *data, const DSI *dsi)
{
    char                *start = data;
    uint16_t           status;
    int         len, num, i, count = 0;

    memcpy(&status, start + AFPSTATUS_VERSOFF, sizeof(status));
    num = sizeof( afp_versions ) / sizeof( afp_versions[ 0 ] );

    for ( i = 0; i < num; i++ ) {
        if ( !dsi && (afp_versions[ i ].av_number >= 22)) continue;
        count++;
    }
    data += ntohs( status );
    *data++ = count;

    for ( i = 0; i < num; i++ ) {
        if ( !dsi && (afp_versions[ i ].av_number >= 22)) continue;
        len = strlen( afp_versions[ i ].av_name );
        *data++ = len;
        memcpy( data, afp_versions[ i ].av_name , len );
        data += len;
    }
    status = htons( data - start );
    memcpy(start + AFPSTATUS_UAMSOFF, &status, sizeof(status));
}

void status_uams(char *data, const char *authlist)
{
    char                *start = data;
    uint16_t           status;
    struct uam_obj      *uams;
    int         len, num = 0;

    memcpy(&status, start + AFPSTATUS_UAMSOFF, sizeof(status));
    uams = &uam_login;
    while ((uams = uams->uam_prev) != &uam_login) {
        if (strstr(authlist, uams->uam_path))
            num++;
    }

    data += ntohs( status );
    *data++ = num;
    while ((uams = uams->uam_prev) != &uam_login) {
        if (strstr(authlist, uams->uam_path)) {
            LOG(log_info, logtype_afpd, "uam: \"%s\" available", uams->uam_name);
            len = strlen( uams->uam_name);
            *data++ = len;
            memcpy( data, uams->uam_name, len );
            data += len;
        }
    }

    /* icon offset */
    status = htons(data - start);
    memcpy(start + AFPSTATUS_ICONOFF, &status, sizeof(status));
}

/* handle errors by closing the connection. this is only needed
 * by the afp_* functions. */
static int send_reply(const AFPObj *obj, const int err)
{
    if ((err == AFP_OK) || (err == AFPERR_AUTHCONT))
        return err;

    obj->reply(obj->dsi, err);
    obj->exit(0);

    return AFP_OK;
}

static int afp_errpwdexpired(AFPObj *obj _U_, char *ibuf _U_, size_t ibuflen _U_, 
                             char *rbuf _U_, size_t *rbuflen)
{
    *rbuflen = 0;
    return AFPERR_PWDEXPR;
}

static int afp_null_nolog(AFPObj *obj _U_, char *ibuf _U_, size_t ibuflen _U_, 
                          char *rbuf _U_, size_t *rbuflen)
{
    *rbuflen = 0;
    return( AFPERR_NOOP );
}

static int set_auth_switch(const AFPObj *obj, int expired)
{
    int i;

    if (expired) {
        /*
         * BF: expired password handling
         * to allow the user to change his/her password we have to allow login
         * but every following call except for FPChangePassword will be thrown
         * away with an AFPERR_PWDEXPR error. (thanks to Leland Wallace from Apple
         * for clarifying this)
         */

        for (i=0; i<=0xff; i++) {
            uam_afpserver_action(i, UAM_AFPSERVER_PREAUTH, afp_errpwdexpired, NULL);
        }
        uam_afpserver_action(AFP_LOGOUT, UAM_AFPSERVER_PREAUTH, afp_logout, NULL);
        uam_afpserver_action(AFP_CHANGEPW, UAM_AFPSERVER_PREAUTH, afp_changepw, NULL);
    }
    else {
        afp_switch = postauth_switch;
        switch (obj->afp_version) {

        case 34:
        case 33:
        case 32:
#ifdef HAVE_ACLS
            uam_afpserver_action(AFP_GETACL, UAM_AFPSERVER_POSTAUTH, afp_getacl, NULL);
            uam_afpserver_action(AFP_SETACL, UAM_AFPSERVER_POSTAUTH, afp_setacl, NULL);
            uam_afpserver_action(AFP_ACCESS, UAM_AFPSERVER_POSTAUTH, afp_access, NULL);
#endif /* HAVE_ACLS */
            uam_afpserver_action(AFP_GETEXTATTR, UAM_AFPSERVER_POSTAUTH, afp_getextattr, NULL);
            uam_afpserver_action(AFP_SETEXTATTR, UAM_AFPSERVER_POSTAUTH, afp_setextattr, NULL);
            uam_afpserver_action(AFP_REMOVEATTR, UAM_AFPSERVER_POSTAUTH, afp_remextattr, NULL);
            uam_afpserver_action(AFP_LISTEXTATTR, UAM_AFPSERVER_POSTAUTH, afp_listextattr, NULL);

        case 31:
            uam_afpserver_action(AFP_SYNCDIR, UAM_AFPSERVER_POSTAUTH, afp_syncdir, NULL);
            uam_afpserver_action(AFP_SYNCFORK, UAM_AFPSERVER_POSTAUTH, afp_syncfork, NULL);
#ifdef HAVE_TRACKER
            uam_afpserver_action(AFP_SPOTLIGHT_PRIVATE, UAM_AFPSERVER_POSTAUTH, afp_spotlight_rpc, NULL);
#endif
            uam_afpserver_action(AFP_ENUMERATE_EXT2, UAM_AFPSERVER_POSTAUTH, afp_enumerate_ext2, NULL);

        case 30:
            uam_afpserver_action(AFP_ENUMERATE_EXT, UAM_AFPSERVER_POSTAUTH, afp_enumerate_ext, NULL);
            uam_afpserver_action(AFP_BYTELOCK_EXT,  UAM_AFPSERVER_POSTAUTH, afp_bytelock_ext, NULL);
            /* catsearch_ext uses the same packet as catsearch FIXME double check this, it wasn't true for enue
               enumerate_ext */
            uam_afpserver_action(AFP_CATSEARCH_EXT, UAM_AFPSERVER_POSTAUTH, afp_catsearch_ext, NULL);
            uam_afpserver_action(AFP_GETSESSTOKEN,  UAM_AFPSERVER_POSTAUTH, afp_getsession, NULL);
            uam_afpserver_action(AFP_READ_EXT,      UAM_AFPSERVER_POSTAUTH, afp_read_ext, NULL);
            uam_afpserver_action(AFP_WRITE_EXT,     UAM_AFPSERVER_POSTAUTH, afp_write_ext, NULL);
            uam_afpserver_action(AFP_DISCTOLDSESS,  UAM_AFPSERVER_POSTAUTH, afp_disconnect, NULL);

        case 22:
            /*
             * If first connection to a server is done in classic AFP2.2 version is used
             * but OSX uses AFP3.x FPzzz command !
             */
            uam_afpserver_action(AFP_ZZZ,  UAM_AFPSERVER_POSTAUTH, afp_zzz, NULL);
            break;
        }
    }

    return AFP_OK;
}

static int login(AFPObj *obj, struct passwd *pwd, void (*logout)(void), int expired)
{
    bool admin = false;
    int i;

    if ( pwd->pw_uid == 0 ) {   /* don't allow root login */
        LOG(log_error, logtype_afpd, "login: root login denied!" );
        return AFPERR_NOTAUTH;
    }

    if (obj->cnx_cnt > obj->cnx_max) {
        LOG(log_error, logtype_dsi, "login: too many connections, limit: %d", obj->cnx_max);
        return AFPERR_MAXSESS;
    }

    LOG(log_note, logtype_afpd, "Login by %s (%s)",
        pwd->pw_name, afp_versions[afp_version_index].av_name);

    if (set_groups(obj, pwd) != 0)
        return AFPERR_BADUAM;

    LOG(log_debug, logtype_afpd, "obj->options.admingid == %d", obj->options.admingid);

    if (obj->options.admingid != 0) {
        for (i = 0; i < obj->ngroups; i++) {
            if (obj->groups[i] == obj->options.admingid) {
                admin = true;
            }
        }
    }
    if (admin) {
        ad_setfuid(0);
        LOG(log_info, logtype_afpd, "admin login -- %s", pwd->pw_name );
    } else {
        if (setegid( pwd->pw_gid ) < 0 || seteuid( pwd->pw_uid ) < 0) {
            LOG(log_error, logtype_afpd, "login: %s %s", pwd->pw_name, strerror(errno) );
            return AFPERR_BADUAM;
        }
    }

    if (obj->options.force_user) {
        if (seteuid(obj->options.force_uid) < 0) {
            LOG(log_error, logtype_afpd, "login: %s %s", pwd->pw_name, strerror(errno));
            return AFPERR_BADUAM;
        }
        LOG(log_info, logtype_afpd, "login: force uid: %ju", (uintmax_t)obj->options.force_uid);
    }

    if (obj->options.force_group) {
        if (setegid(obj->options.force_gid) < 0) {
            LOG(log_error, logtype_afpd, "login: %s %s", pwd->pw_name, strerror(errno));
            return AFPERR_BADUAM;
        }
        LOG(log_info, logtype_afpd, "login: force gid: %ju", (uintmax_t)obj->options.force_gid);
    }

    LOG(log_debug, logtype_afpd, "login: supplementary groups: %s", print_groups(obj->ngroups, obj->groups));

    set_auth_switch(obj, expired);
    obj->logout = logout;
    obj->uid = pwd->pw_uid;
    obj->euid = geteuid();

    /* pam_umask or similar might have changed our umask */
    (void)umask(obj->options.umask);

    /* Some PAM module might have reset our signal handlers and timer, so we need to reestablish them */
    afp_over_dsi_sighandlers(obj);

    /* Send FCE login event */
    fce_register(obj, FCE_LOGIN, "", NULL);

    return( AFP_OK );
}

/* ---------------------- */
int afp_zzz(AFPObj *obj, char *ibuf, size_t ibuflen, char *rbuf, size_t *rbuflen)
{
    uint32_t data;
    DSI *dsi = (DSI *)AFPobj->dsi;

    *rbuflen = 0;
    ibuf += 2;
    ibuflen -= 2;

    if (ibuflen < 4)
        return AFPERR_MISC;
    memcpy(&data, ibuf, 4); /* flag */
    data = ntohl(data);

    /*
     * Possible sleeping states:
     * 1) normal sleep: DSI_SLEEPING (up to 10.3)
     * 2) extended sleep: DSI_SLEEPING | DSI_EXTSLEEP (starting with 10.4)
     */

    if (data & AFPZZZ_EXT_WAKEUP) {
        /* wakeup request from exetended sleep */
        if (dsi->flags & DSI_EXTSLEEP) {
            LOG(log_note, logtype_afpd, "afp_zzz: waking up from extended sleep");
            dsi->flags &= ~(DSI_SLEEPING | DSI_EXTSLEEP);
            ipc_child_state(obj, DSI_RUNNING);
        }
    } else {
        /* sleep request */
        dsi->flags |= DSI_SLEEPING;
        if (data & AFPZZZ_EXT_SLEEP) {
            LOG(log_note, logtype_afpd, "afp_zzz: entering extended sleep");
            dsi->flags |= DSI_EXTSLEEP;
            ipc_child_state(obj, DSI_EXTSLEEP);
        } else {
            LOG(log_note, logtype_afpd, "afp_zzz: entering normal sleep");
            ipc_child_state(obj, DSI_SLEEPING);
        }
    }

    /*
     * According to AFP 3.3 spec we should not return anything,
     * but e.g. 10.5.8 server still returns the numbers of hours
     * the server is keeping the sessino (ie max sleeptime).
     */
    data = obj->options.sleep / 120; /* hours */
    if (!data) {
        data = 1;
    }
    *rbuflen = sizeof(data);
    data = htonl(data);
    memcpy(rbuf, &data, sizeof(data));
    rbuf += sizeof(data);

    return AFP_OK;
}

/* ---------------------- */
static int create_session_token(AFPObj *obj)
{
    pid_t pid;

    /* use 8 bytes for token as OSX, don't know if it helps */
    if ( sizeof(pid_t) > SESSIONTOKEN_LEN) {
        LOG(log_error, logtype_afpd, "sizeof(pid_t) > %u", SESSIONTOKEN_LEN );
        return AFPERR_MISC;
    }

    if ( NULL == (obj->sinfo.sessiontoken = malloc(SESSIONTOKEN_LEN)) )
        return AFPERR_MISC;

    memset(obj->sinfo.sessiontoken, 0, SESSIONTOKEN_LEN);
    obj->sinfo.sessiontoken_len = SESSIONTOKEN_LEN;
    pid = getpid();
    memcpy(obj->sinfo.sessiontoken, &pid, sizeof(pid_t));

    return 0;
}

static int create_session_key(AFPObj *obj)
{
    /* create session key */
    if (obj->sinfo.sessionkey == NULL) {
        if (NULL == (obj->sinfo.sessionkey = malloc(SESSIONKEY_LEN)) )
            return AFPERR_MISC;
        uam_random_string(obj, obj->sinfo.sessionkey, SESSIONKEY_LEN);
        obj->sinfo.sessionkey_len = SESSIONKEY_LEN;
    }
    return AFP_OK;
}


/* ---------------------- */
int afp_getsession(
    AFPObj *obj,
    char   *ibuf, size_t ibuflen, 
    char   *rbuf, size_t *rbuflen)
{
    uint16_t           type;
    uint32_t           idlen = 0;
    uint32_t       boottime;
    uint32_t           tklen, tp;
    char                *token;
    char                *p;

    *rbuflen = 0;
    tklen = 0;

    if (ibuflen < 2 + sizeof(type)) {
        return AFPERR_PARAM;
    }

    ibuf += 2;
    ibuflen -= 2;

    memcpy(&type, ibuf, sizeof(type));
    type = ntohs(type);
    ibuf += sizeof(type);
    ibuflen -= sizeof(type);

    if ( obj->sinfo.sessiontoken == NULL ) {
        if ( create_session_token( obj ) )
            return AFPERR_MISC;
    }

    /*
     *
     */
    switch (type) {
    case 0: /* old version ?*/
        tklen = obj->sinfo.sessiontoken_len;
        token = obj->sinfo.sessiontoken;
        break;
    case 1: /* disconnect */
    case 2: /* reconnect update id */
        if (ibuflen >= sizeof(idlen)) {
            memcpy(&idlen, ibuf, sizeof(idlen));
            idlen = ntohl(idlen);
            ibuf += sizeof(idlen);
            ibuflen -= sizeof(idlen);
            if (ibuflen < idlen) {
                return AFPERR_PARAM;
            }
            /* memcpy (id, ibuf, idlen) */
            tklen = obj->sinfo.sessiontoken_len;
            token = obj->sinfo.sessiontoken;
        }
        break;
    case 3:
    case 4:
        if (ibuflen >= 8 ) {
            p = ibuf;
            memcpy( &idlen, ibuf, sizeof(idlen));
            idlen = ntohl(idlen);
            ibuf += sizeof(idlen);
            ibuflen -= sizeof(idlen);
            ibuf += sizeof(boottime);
            ibuflen -= sizeof(boottime);
            if (ibuflen < idlen || idlen > (90-10)) {
                return AFPERR_PARAM;
            }
            if (!obj->sinfo.clientid) {
                obj->sinfo.clientid = malloc(idlen + 8);
                memcpy(obj->sinfo.clientid, p, idlen + 8);
                obj->sinfo.clientid_len = idlen + 8;
            }
            if (ipc_child_write(obj->ipc_fd, IPC_GETSESSION, idlen+8, p) != 0)
                return AFPERR_MISC;
            tklen = obj->sinfo.sessiontoken_len;
            token = obj->sinfo.sessiontoken;
        }
        break;
    case 8: /* Panther Kerberos Token */
        tklen = obj->sinfo.cryptedkey_len;
        token = obj->sinfo.cryptedkey;
        break;
    default:
        return AFPERR_NOOP;
        break;

    }

    if (tklen == 0)
        return AFPERR_MISC;

    tp = htonl(tklen);
    memcpy(rbuf, &tp, sizeof(tklen));
    rbuf += sizeof(tklen);
    *rbuflen += sizeof(tklen);

    memcpy(rbuf, token, tklen);
    *rbuflen += tklen;

    return AFP_OK;
}

/* ---------------------- */
int afp_disconnect(AFPObj *obj, char *ibuf, size_t ibuflen _U_, char *rbuf _U_, size_t *rbuflen)
{
    DSI                 *dsi = (DSI *)obj->dsi;
    uint16_t           type;
    uint32_t           tklen;
    pid_t               token;
    int                 i;

    *rbuflen = 0;
    ibuf += 2;

#if 0
    /* check for guest user */
    if ( 0 == (strcasecmp(obj->username, obj->options.guest)) ) {
        return AFPERR_MISC;
    }
#endif

    memcpy(&type, ibuf, sizeof(type));
    type = ntohs(type);
    ibuf += sizeof(type);

    memcpy(&tklen, ibuf, sizeof(tklen));
    tklen = ntohl(tklen);
    ibuf += sizeof(tklen);

    if ( sizeof(pid_t) > SESSIONTOKEN_LEN) {
        LOG(log_error, logtype_afpd, "sizeof(pid_t) > %u", SESSIONTOKEN_LEN );
        return AFPERR_MISC;
    }
    if (tklen != SESSIONTOKEN_LEN) {
        return AFPERR_MISC;
    }
    tklen = sizeof(pid_t);
    memcpy(&token, ibuf, tklen);

    /* our stuff is pid + zero pad */
    ibuf += tklen;
    for (i = tklen; i < SESSIONTOKEN_LEN; i++, ibuf++) {
        if (*ibuf != 0) {
            return AFPERR_MISC;
        }
    }

    LOG(log_note, logtype_afpd, "afp_disconnect: trying primary reconnect");
    dsi->flags |= DSI_RECONINPROG;

    /* Deactivate tickle timer */
    const struct itimerval none = {{0, 0}, {0, 0}};
    setitimer(ITIMER_REAL, &none, NULL);

    /* check for old session, possibly transferring session from here to there */
    if (ipc_child_write(obj->ipc_fd, IPC_DISCOLDSESSION, tklen, &token) != 0)
        goto exit;
    /* write uint16_t DSI request ID */
    if (writet(obj->ipc_fd, &dsi->header.dsi_requestID, 2, 0, 2) != 2) {
        LOG(log_error, logtype_afpd, "afp_disconnect: couldn't send DSI request ID");
        goto exit;
    }
    /* now send our connected AFP client socket */
    if (send_fd(obj->ipc_fd, dsi->socket) != 0)
        goto exit;
    /* Now see what happens: either afpd master sends us SIGTERM because our session */
    /* has been transferred to a old disconnected session, or we continue    */
    sleep(5);

    if (!(dsi->flags & DSI_RECONINPROG)) { /* deleted in SIGTERM handler */
        /* Reconnect succeeded, we exit now after sleeping some more */
        sleep(2); /* sleep some more to give the recon. session time */
        LOG(log_note, logtype_afpd, "afp_disconnect: primary reconnect succeeded");
        exit(0);
    }

exit:
    /* Reinstall tickle timer */
    setitimer(ITIMER_REAL, &dsi->timer, NULL);

    LOG(log_error, logtype_afpd, "afp_disconnect: primary reconnect failed");
    return AFPERR_MISC;
}

/* ---------------------- */
static int get_version(AFPObj *obj, char *ibuf, size_t ibuflen, size_t len)
{
    int num,i;

    if (!len || len > ibuflen)
        return AFPERR_BADVERS;

    num = sizeof( afp_versions ) / sizeof( afp_versions[ 0 ]);
    for ( i = 0; i < num; i++ ) {
        if ( strncmp( ibuf, afp_versions[ i ].av_name , len ) == 0 ) {
            obj->afp_version = afp_versions[ i ].av_number;
            afp_version_index = i;
            break;
        }
    }
    if ( i == num )                 /* An inappropo version */
        return AFPERR_BADVERS ;

    /* FIXME Hack */
    if (obj->afp_version >= 30 && sizeof(off_t) != 8) {
        LOG(log_error, logtype_afpd, "get_version: no LARGE_FILE support recompile!" );
        return AFPERR_BADVERS ;
    }

    return 0;
}

/* ---------------------- */
int afp_login(AFPObj *obj, char *ibuf, size_t ibuflen, char *rbuf, size_t *rbuflen)
{
    struct passwd *pwd = NULL;
    size_t len;
    int     i;

    *rbuflen = 0;

    if ( nologin & 1)
        return send_reply(obj, AFPERR_SHUTDOWN );

    if (ibuflen < 2)
        return send_reply(obj, AFPERR_BADVERS );

    ibuf++;
    len = (unsigned char) *ibuf++;
    ibuflen -= 2;

    i = get_version(obj, ibuf, ibuflen, len);
    if (i)
        return send_reply(obj, i );

    if (ibuflen <= len)
        return send_reply(obj, AFPERR_BADUAM);

    ibuf += len;
    ibuflen -= len;

    len = (unsigned char) *ibuf++;
    ibuflen--;

    if (!len || len > ibuflen)
        return send_reply(obj, AFPERR_BADUAM);

    if (NULL == (afp_uam = auth_uamfind(UAM_SERVER_LOGIN, ibuf, len)) )
        return send_reply(obj, AFPERR_BADUAM);
    ibuf += len;
    ibuflen -= len;

    if (AFP_OK != (i = create_session_key(obj)) )
        return send_reply(obj, i);

    i = afp_uam->u.uam_login.login(obj, &pwd, ibuf, ibuflen, rbuf, rbuflen);

    if (!pwd || ( i != AFP_OK && i != AFPERR_PWDEXPR))
        return send_reply(obj, i);

    return send_reply(obj, login(obj, pwd, afp_uam->u.uam_login.logout, ((i==AFPERR_PWDEXPR)?1:0)));
}

/* ---------------------- */
int afp_login_ext(AFPObj *obj, char *ibuf, size_t ibuflen, char *rbuf, size_t *rbuflen)
{
    struct passwd *pwd = NULL;
    size_t  len;
    int     i;
    char        type;
    uint16_t   len16;
    char        *username;

    *rbuflen = 0;

    if ( nologin & 1)
        return send_reply(obj, AFPERR_SHUTDOWN );

    if (ibuflen < 5)
        return send_reply(obj, AFPERR_BADVERS );

    ibuf++;
    ibuf++;     /* pad  */
    ibuf +=2;   /* flag */

    len = (unsigned char) *ibuf;
    ibuf++;
    ibuflen -= 5;

    i = get_version(obj, ibuf, ibuflen, len);
    if (i)
        return send_reply(obj, i );

    if (ibuflen <= len)
        return send_reply(obj, AFPERR_BADUAM);

    ibuf    += len;
    ibuflen -= len;

    len = (unsigned char) *ibuf;
    ibuf++;
    ibuflen--;

    if (!len || len > ibuflen)
        return send_reply(obj, AFPERR_BADUAM);

    if ((afp_uam = auth_uamfind(UAM_SERVER_LOGIN, ibuf, len)) == NULL)
        return send_reply(obj, AFPERR_BADUAM);
    ibuf    += len;
    ibuflen -= len;

    if (!afp_uam->u.uam_login.login_ext) {
        LOG(log_error, logtype_afpd, "login_ext: uam %s not AFP 3 ready!", afp_uam->uam_name );
        return send_reply(obj, AFPERR_BADUAM);
    }
    /* user name */
    if (ibuflen <= 1 +sizeof(len16))
        return send_reply(obj, AFPERR_PARAM);
    type = *ibuf;
    username = ibuf;
    ibuf++;
    ibuflen--;
    if (type != 3)
        return send_reply(obj, AFPERR_PARAM);

    memcpy(&len16, ibuf, sizeof(len16));
    ibuf += sizeof(len16);
    ibuflen -= sizeof(len16);
    len = ntohs(len16);
    if (len > ibuflen)
        return send_reply(obj, AFPERR_PARAM);
    ibuf += len;
    ibuflen -= len;

    /* directory service name */
    if (!ibuflen)
        return send_reply(obj, AFPERR_PARAM);
    type = *ibuf;
    ibuf++;
    ibuflen--;

    switch(type) {
    case 1:
    case 2:
        if (!ibuflen)
            return send_reply(obj, AFPERR_PARAM);
        len = (unsigned char) *ibuf;
        ibuf++;
        ibuflen--;
        break;
    case 3:
        /* With "No User Authen" it is equal */
        if (ibuflen < sizeof(len16))
            return send_reply(obj, AFPERR_PARAM);
        memcpy(&len16, ibuf, sizeof(len16));
        ibuf += sizeof(len16);
        ibuflen -= sizeof(len16);
        len = ntohs(len16);
        break;
    default:
        return send_reply(obj, AFPERR_PARAM);
    }
#if 0
    if (len != 0) {
        LOG(log_error, logtype_afpd, "login_ext: directory service path not null!" );
        return send_reply(obj, AFPERR_PARAM);
    }
#endif
    ibuf += len;
    ibuflen -= len;

    /* Pad */
    if (ibuflen && ((unsigned long) ibuf & 1)) { /* pad character */
        ibuf++;
        ibuflen--;
    }

    if (AFP_OK != (i = create_session_key(obj)) ) {
        return send_reply(obj, i);
    }

    /* FIXME user name are in UTF8 */
    i = afp_uam->u.uam_login.login_ext(obj, username, &pwd, ibuf, ibuflen, rbuf, rbuflen);

    if (!pwd || ( i != AFP_OK && i != AFPERR_PWDEXPR))
        return send_reply(obj, i);

    return send_reply(obj, login(obj, pwd, afp_uam->u.uam_login.logout, ((i==AFPERR_PWDEXPR)?1:0)));
}

/* ---------------------- */
int afp_logincont(AFPObj *obj, char *ibuf, size_t ibuflen, char *rbuf, size_t *rbuflen)
{
    struct passwd *pwd = NULL;
    int err;

    if ( afp_uam == NULL || afp_uam->u.uam_login.logincont == NULL || ibuflen < 2 ) {
        *rbuflen = 0;
        return send_reply(obj, AFPERR_NOTAUTH );
    }

    ibuf += 2; ibuflen -= 2;
    err = afp_uam->u.uam_login.logincont(obj, &pwd, ibuf, ibuflen,
                                         rbuf, rbuflen);
    if (!pwd || ( err != AFP_OK && err != AFPERR_PWDEXPR))
        return send_reply(obj, err);

    return send_reply(obj, login(obj, pwd, afp_uam->u.uam_login.logout, ((err==AFPERR_PWDEXPR)?1:0)));
}


int afp_logout(AFPObj *obj, char *ibuf _U_, size_t ibuflen  _U_, char *rbuf  _U_, size_t *rbuflen)
{
    DSI *dsi = (DSI *)(obj->dsi);

    LOG(log_note, logtype_afpd, "AFP logout by %s", obj->username);
    of_close_all_forks(obj);
    close_all_vol(obj);
    dsi->flags = DSI_AFP_LOGGED_OUT;
    *rbuflen = 0;

    /* Send FCE login event */
    fce_register(obj, FCE_LOGOUT, "", NULL);

    return AFP_OK;
}



/* change password  --
 * NOTE: an FPLogin must already have completed successfully for this
 *       to work. this also does a little pre-processing before it hands
 *       it off to the uam.
 */
int afp_changepw(AFPObj *obj, char *ibuf, size_t ibuflen, char *rbuf, size_t *rbuflen)
{
    char username[MACFILELEN + 1], *start = ibuf;
    struct uam_obj *uam;
    struct passwd *pwd;
    size_t len;
    int    ret;

    *rbuflen = 0;
    ibuf += 2;

    /* check if password change is allowed, OS-X ignores the flag.
     * we shouldn't trust the client on this anyway.
     * not sure about the "right" error code, NOOP for now */
    if (!(obj->options.passwdbits & PASSWD_SET))
        return AFPERR_NOOP;

    /* make sure we can deal w/ this uam */
    len = (unsigned char) *ibuf++;
    if ((uam = auth_uamfind(UAM_SERVER_CHANGEPW, ibuf, len)) == NULL)
        return AFPERR_BADUAM;

    ibuf += len;
    if ((len + 1) & 1) /* pad byte */
        ibuf++;

    if (obj->afp_version < 30) {
        len = (unsigned char) *ibuf++;
        if ( len > sizeof(username) - 1) {
            return AFPERR_PARAM;
        }
        memcpy(username, ibuf, len);
        username[ len ] = '\0';
        ibuf += len;
        if ((len + 1) & 1) /* pad byte */
            ibuf++;
    } else {
        /* AFP > 3.0 doesn't pass the username, APF 3.1 specs page 124 */
        if ( ibuf[0] != '\0' || ibuf[1] != '\0')
            return AFPERR_PARAM;
        ibuf += 2;
        len = MIN(sizeof(username) - 1, strlen(obj->username));
        memcpy(username, obj->username, len);
        username[ len ] = '\0';
    }


    LOG(log_info, logtype_afpd, "changing password for <%s>", username);

    if (( pwd = uam_getname( obj, username, sizeof(username))) == NULL )
        return AFPERR_PARAM;

    /* send it off to the uam. we really don't use ibuflen right now. */
    if (ibuflen < (size_t)(ibuf - start)) 
        return AFPERR_PARAM;
    
    ibuflen -= (ibuf - start);
    ret = uam->u.uam_changepw(obj, username, pwd, ibuf, ibuflen,
                              rbuf, rbuflen);
    LOG(log_info, logtype_afpd, "password change %s.",
        (ret == AFPERR_AUTHCONT) ? "continued" :
        (ret ? "failed" : "succeeded"));
    if ( ret == AFP_OK )
        set_auth_switch(obj, 0);

    return ret;
}


/* FPGetUserInfo */
int afp_getuserinfo(AFPObj *obj _U_, char *ibuf, size_t ibuflen _U_, char *rbuf, size_t *rbuflen)
{
    uint8_t  thisuser;
    uint32_t id;
    uint16_t bitmap;
    char *bitmapp;

    LOG(log_debug, logtype_afpd, "begin afp_getuserinfo:");

    *rbuflen = 0;
    ibuf++;
    thisuser = *ibuf++;
    ibuf += sizeof(id); /* userid is not used in AFP 2.0 */
    memcpy(&bitmap, ibuf, sizeof(bitmap));
    bitmap = ntohs(bitmap);

    /* deal with error cases. we don't have to worry about
     * AFPERR_ACCESS or AFPERR_NOITEM as geteuid and getegid always
     * succeed. */
    if (!thisuser)
        return AFPERR_PARAM;
    if ((bitmap & USERIBIT_ALL) != bitmap)
        return AFPERR_BITMAP;

    /* remember place where we store the possibly modified bitmap later */
    memcpy(rbuf, ibuf, sizeof(bitmap));
    bitmapp = rbuf;
    rbuf += sizeof(bitmap);
    *rbuflen = sizeof(bitmap);

    /* copy the user/group info */
    if (bitmap & USERIBIT_USER) {
        id = htonl(geteuid());
        memcpy(rbuf, &id, sizeof(id));
        rbuf += sizeof(id);
        *rbuflen += sizeof(id);
    }

    if (bitmap & USERIBIT_GROUP) {
        id = htonl(getegid());
        memcpy(rbuf, &id, sizeof(id));
        rbuf += sizeof(id);
        *rbuflen += sizeof(id);
    }

    if (bitmap & USERIBIT_UUID) {
        if ( ! (obj->options.flags & OPTION_UUID)) {
            bitmap &= ~USERIBIT_UUID;
            bitmap = htons(bitmap);
            memcpy(bitmapp, &bitmap, sizeof(bitmap));
        } else {
            LOG(log_debug, logtype_afpd, "afp_getuserinfo: get UUID for \'%s\'", obj->username);
            int ret;
            atalk_uuid_t uuid;
            ret = getuuidfromname( obj->username, UUID_USER, uuid);
            if (ret != 0) {
                LOG(log_info, logtype_afpd, "afp_getuserinfo: error getting UUID !");
                return AFPERR_NOITEM;
            }
            LOG(log_debug, logtype_afpd, "afp_getuserinfo: got UUID: %s", uuid_bin2string(uuid));

            memcpy(rbuf, uuid, UUID_BINSIZE);
            rbuf += UUID_BINSIZE;
            *rbuflen += UUID_BINSIZE;
        }
    }

    LOG(log_debug, logtype_afpd, "END afp_getuserinfo:");
    return AFP_OK;
}

#define UAM_LIST(type) (((type) == UAM_SERVER_LOGIN || (type) == UAM_SERVER_LOGIN_EXT) ? &uam_login : \
                        (((type) == UAM_SERVER_CHANGEPW) ?              \
                         &uam_changepw : NULL))

/* just do a linked list search. this could be sped up with a hashed
 * list, but i doubt anyone's going to have enough uams to matter. */
struct uam_obj *auth_uamfind(const int type, const char *name,
                             const int len)
{
    struct uam_obj *prev, *start;

    if (!name || !(start = UAM_LIST(type)))
        return NULL;

    prev = start;
    while ((prev = prev->uam_prev) != start)
        if (strndiacasecmp(prev->uam_name, name, len) == 0)
            return prev;

    return NULL;
}

int auth_register(const int type, struct uam_obj *uam)
{
    struct uam_obj *start;

    if (!uam || !uam->uam_name || (*uam->uam_name == '\0'))
        return -1;

    if (!(start = UAM_LIST(type)))
        return 1; /* we don't know what to do with it, caller must free it */

    uam_attach(start, uam);
    return 0;
}

/* load all of the modules */
int auth_load(AFPObj *obj, const char *path, const char *list)
{
    char name[MAXPATHLEN + 1], buf[MAXPATHLEN + 1], *p, *last;
    struct uam_mod *mod;
    struct stat st;
    size_t len;

    if (!path || !*path || !list || (len = strlen(path)) > sizeof(name) - 2)
        return -1;

    LOG(log_debug, logtype_afpd, "auth_load: %s, %s", path, list);

    strlcpy(buf, list, sizeof(buf));
    if ((p = strtok_r(buf, ", ", &last)) == NULL)
        return -1;

    strcpy(name, path);
    if (name[len - 1] != '/') {
        strcat(name, "/");
        len++;
    }

    while (p) {
        strlcpy(name + len, p, sizeof(name) - len);
        LOG(log_debug, logtype_afpd, "uam: loading (%s)", name);
        /*
          if ((stat(name, &st) == 0) && (mod = uam_load(name, p))) {
        */
        if (stat(name, &st) == 0) {
            if ((mod = uam_load(obj, name, p))) {
                uam_attach(&uam_modules, mod);
                LOG(log_debug, logtype_afpd, "uam: %s loaded", p);
            } else {
                LOG(log_error, logtype_afpd, "uam: %s load failure",p);
            }
        } else {
            LOG(log_info, logtype_afpd, "uam: uam not found (status=%d)", stat(name, &st));
        }
        p = strtok_r(NULL, ", ", &last);
    }

    return 0;
}

/* get rid of all of the uams */
void auth_unload(void)
{
    struct uam_mod *mod, *prev, *start = &uam_modules;

    prev = start->uam_prev;
    while ((mod = prev) != start) {
        prev = prev->uam_prev;
        uam_detach(mod);
        uam_unload(mod);
    }
}