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util.c

/*
 * Copyright (c) 1997 - 2002 Kungliga Tekniska Högskolan
 * (Royal Institute of Technology, Stockholm, Sweden). 
 * All rights reserved. 
 *
 * Redistribution and use in source and binary forms, with or without 
 * modification, are permitted provided that the following conditions 
 * are met: 
 *
 * 1. Redistributions of source code must retain the above copyright 
 *    notice, this list of conditions and the following disclaimer. 
 *
 * 2. Redistributions in binary form must reproduce the above copyright 
 *    notice, this list of conditions and the following disclaimer in the 
 *    documentation and/or other materials provided with the distribution. 
 *
 * 3. Neither the name of the Institute nor the names of its contributors 
 *    may be used to endorse or promote products derived from this software 
 *    without specific prior written permission. 
 *
 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 
 * SUCH DAMAGE. 
 */

#include "kadmin_locl.h"
#include <parse_units.h>

RCSID("$Id: util.c,v 1.39 2003/04/14 11:55:27 lha Exp $");

/*
 * util.c - functions for parsing, unparsing, and editing different
 * types of data used in kadmin.
 */

static int
get_response(const char *prompt, const char *def, char *buf, size_t len);

/*
 * attributes 
 */

struct units kdb_attrs[] = {
    { "new-princ",            KRB5_KDB_NEW_PRINC },
    { "support-desmd5",       KRB5_KDB_SUPPORT_DESMD5 },
    { "pwchange-service",     KRB5_KDB_PWCHANGE_SERVICE },
    { "disallow-svr",         KRB5_KDB_DISALLOW_SVR },
    { "requires-pw-change",   KRB5_KDB_REQUIRES_PWCHANGE },
    { "requires-hw-auth",     KRB5_KDB_REQUIRES_HW_AUTH },
    { "requires-pre-auth",    KRB5_KDB_REQUIRES_PRE_AUTH },
    { "disallow-all-tix",     KRB5_KDB_DISALLOW_ALL_TIX },
    { "disallow-dup-skey",    KRB5_KDB_DISALLOW_DUP_SKEY },
    { "disallow-proxiable",   KRB5_KDB_DISALLOW_PROXIABLE },
    { "disallow-renewable",   KRB5_KDB_DISALLOW_RENEWABLE },
    { "disallow-tgt-based",   KRB5_KDB_DISALLOW_TGT_BASED },
    { "disallow-forwardable", KRB5_KDB_DISALLOW_FORWARDABLE },
    { "disallow-postdated",   KRB5_KDB_DISALLOW_POSTDATED },
    { NULL }
};

/*
 * convert the attributes in `attributes' into a printable string
 * in `str, len'
 */

void
attributes2str(krb5_flags attributes, char *str, size_t len)
{
    unparse_flags (attributes, kdb_attrs, str, len);
}

/*
 * convert the string in `str' into attributes in `flags'
 * return 0 if parsed ok, else -1.
 */

int
str2attributes(const char *str, krb5_flags *flags)
{
    int res;

    res = parse_flags (str, kdb_attrs, *flags);
    if (res < 0)
      return res;
    else {
      *flags = res;
      return 0;
    }
}

/*
 * try to parse the string `resp' into attributes in `attr', also
 * setting the `bit' in `mask' if attributes are given and valid.
 */

int
parse_attributes (const char *resp, krb5_flags *attr, int *mask, int bit)
{
    krb5_flags tmp = *attr;

    if (str2attributes(resp, &tmp) == 0) {
      *attr = tmp;
      if (mask)
          *mask |= bit;
      return 0;
    } else if(*resp == '?') {
      print_flags_table (kdb_attrs, stderr);
    } else {
      fprintf (stderr, "Unable to parse '%s'\n", resp);
    }
    return -1;
}

/*
 * allow the user to edit the attributes in `attr', prompting with `prompt'
 */

int
edit_attributes (const char *prompt, krb5_flags *attr, int *mask, int bit)
{
    char buf[1024], resp[1024];

    if (mask && (*mask & bit))
      return 0;

    attributes2str(*attr, buf, sizeof(buf));
    for (;;) {
      if(get_response("Attributes", buf, resp, sizeof(resp)) != 0)
          return 1;
      if (resp[0] == '\0')
          break;
      if (parse_attributes (resp, attr, mask, bit) == 0)
          break;
    }
    return 0;
}

/*
 * time_t
 * the special value 0 means ``never''
 */

/*
 * Convert the time `t' to a string representation in `str' (of max
 * size `len').  If include_time also include time, otherwise just
 * date.  
 */

void
time_t2str(time_t t, char *str, size_t len, int include_time)
{
    if(t) {
      if(include_time)
          strftime(str, len, "%Y-%m-%d %H:%M:%S UTC", gmtime(&t));
      else
          strftime(str, len, "%Y-%m-%d", gmtime(&t));
    } else
      snprintf(str, len, "never");
}

/*
 * Convert the time representation in `str' to a time in `time'.
 * Return 0 if succesful, else -1.
 */

int
str2time_t (const char *str, time_t *t)
{
    const char *p;
    struct tm tm, tm2;

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

    if(strcasecmp(str, "never") == 0) {
      *t = 0;
      return 0;
    }

    if(strcasecmp(str, "now") == 0) {
      *t = time(NULL);
      return 0;
    }

    p = strptime (str, "%Y-%m-%d", &tm);

    if (p == NULL)
      return -1;

    /* Do it on the end of the day */
    tm2.tm_hour = 23;
    tm2.tm_min  = 59;
    tm2.tm_sec  = 59;

    if(strptime (p, "%H:%M:%S", &tm2) != NULL) {
      tm.tm_hour = tm2.tm_hour;
      tm.tm_min  = tm2.tm_min;
      tm.tm_sec  = tm2.tm_sec;
    }

    *t = tm2time (tm, 0);
    return 0;
}

/*
 * try to parse the time in `resp' storing it in `value'
 */

int
parse_timet (const char *resp, krb5_timestamp *value, int *mask, int bit)
{
    time_t tmp;

    if (str2time_t(resp, &tmp) == 0) {
      *value = tmp;
      if(mask)
          *mask |= bit;
      return 0;
    } else if(*resp == '?') {
      printf ("Print date on format YYYY-mm-dd [hh:mm:ss]\n");
    } else {
      fprintf (stderr, "Unable to parse time '%s'\n", resp);
    }
    return -1;
}

/*
 * allow the user to edit the time in `value'
 */

int
edit_timet (const char *prompt, krb5_timestamp *value, int *mask, int bit)
{
    char buf[1024], resp[1024];

    if (mask && (*mask & bit))
      return 0;

    time_t2str (*value, buf, sizeof (buf), 0);

    for (;;) {
      if(get_response(prompt, buf, resp, sizeof(resp)) != 0)
          return 1;
      if (parse_timet (resp, value, mask, bit) == 0)
          break;
    }
    return 0;
}

/*
 * deltat
 * the special value 0 means ``unlimited''
 */

/*
 * convert the delta_t value in `t' into a printable form in `str, len'
 */

void
deltat2str(unsigned t, char *str, size_t len)
{
    if(t == 0 || t == INT_MAX)
      snprintf(str, len, "unlimited");
    else
      unparse_time(t, str, len);
}

/*
 * parse the delta value in `str', storing result in `*delta'
 * return 0 if ok, else -1
 */

int
str2deltat(const char *str, krb5_deltat *delta)
{
    int res;

    if(strcasecmp(str, "unlimited") == 0) {
      *delta = 0;
      return 0;
    }
    res = parse_time(str, "day");
    if (res < 0)
      return res;
    else {
      *delta = res;
      return 0;
    }
}

/*
 * try to parse the string in `resp' into a deltad in `value'
 * `mask' will get the bit `bit' set if a value was given.
 */

int
parse_deltat (const char *resp, krb5_deltat *value, int *mask, int bit)
{
    krb5_deltat tmp;

    if (str2deltat(resp, &tmp) == 0) {
      *value = tmp;
      if (mask)
          *mask |= bit;
      return 0;
    } else if(*resp == '?') {
      print_time_table (stderr);
    } else {
      fprintf (stderr, "Unable to parse time '%s'\n", resp);
    }
    return -1;
}

/*
 * allow the user to edit the deltat in `value'
 */

int
edit_deltat (const char *prompt, krb5_deltat *value, int *mask, int bit)
{
    char buf[1024], resp[1024];

    if (mask && (*mask & bit))
      return 0;

    deltat2str(*value, buf, sizeof(buf));
    for (;;) {
      if(get_response(prompt, buf, resp, sizeof(resp)) != 0)
          return 1;
      if (parse_deltat (resp, value, mask, bit) == 0)
          break;
    }
    return 0;
}

/*
 * allow the user to edit `ent'
 */

void
set_defaults(kadm5_principal_ent_t ent, int *mask,
           kadm5_principal_ent_t default_ent, int default_mask)
{
    if (default_ent
      && (default_mask & KADM5_MAX_LIFE)
      && !(*mask & KADM5_MAX_LIFE))
      ent->max_life = default_ent->max_life;

    if (default_ent
      && (default_mask & KADM5_MAX_RLIFE)
      && !(*mask & KADM5_MAX_RLIFE))
      ent->max_renewable_life = default_ent->max_renewable_life;

    if (default_ent
      && (default_mask & KADM5_PRINC_EXPIRE_TIME)
      && !(*mask & KADM5_PRINC_EXPIRE_TIME))
      ent->princ_expire_time = default_ent->princ_expire_time;

    if (default_ent
      && (default_mask & KADM5_PW_EXPIRATION)
      && !(*mask & KADM5_PW_EXPIRATION))
      ent->pw_expiration = default_ent->pw_expiration;

    if (default_ent
      && (default_mask & KADM5_ATTRIBUTES)
      && !(*mask & KADM5_ATTRIBUTES))
      ent->attributes = default_ent->attributes & ~KRB5_KDB_DISALLOW_ALL_TIX;
}

int
edit_entry(kadm5_principal_ent_t ent, int *mask,
         kadm5_principal_ent_t default_ent, int default_mask)
{

    set_defaults(ent, mask, default_ent, default_mask);

    if(edit_deltat ("Max ticket life", &ent->max_life, mask,
                KADM5_MAX_LIFE) != 0)
      return 1;
    
    if(edit_deltat ("Max renewable life", &ent->max_renewable_life, mask,
                KADM5_MAX_RLIFE) != 0)
      return 1;

    if(edit_timet ("Principal expiration time", &ent->princ_expire_time, mask,
               KADM5_PRINC_EXPIRE_TIME) != 0)
      return 1;

    if(edit_timet ("Password expiration time", &ent->pw_expiration, mask,
               KADM5_PW_EXPIRATION) != 0)
      return 1;

    if(edit_attributes ("Attributes", &ent->attributes, mask,
                  KADM5_ATTRIBUTES) != 0)
      return 1;

    return 0;
}

/*
 * Parse the arguments, set the fields in `ent' and the `mask' for the
 * entries having been set.
 * Return 1 on failure and 0 on success.
 */

int
set_entry(krb5_context context,
        kadm5_principal_ent_t ent,
        int *mask,
        const char *max_ticket_life,
        const char *max_renewable_life,
        const char *expiration,
        const char *pw_expiration,
        const char *attributes)
{
    if (max_ticket_life != NULL) {
      if (parse_deltat (max_ticket_life, &ent->max_life, 
                    mask, KADM5_MAX_LIFE)) {
          krb5_warnx (context, "unable to parse `%s'", max_ticket_life);
          return 1;
      }
    }
    if (max_renewable_life != NULL) {
      if (parse_deltat (max_renewable_life, &ent->max_renewable_life, 
                    mask, KADM5_MAX_RLIFE)) {
          krb5_warnx (context, "unable to parse `%s'", max_renewable_life);
          return 1;
      }
    }

    if (expiration) {
      if (parse_timet (expiration, &ent->princ_expire_time, 
                  mask, KADM5_PRINC_EXPIRE_TIME)) {
          krb5_warnx (context, "unable to parse `%s'", expiration);
          return 1;
      }
    }
    if (pw_expiration) {
      if (parse_timet (pw_expiration, &ent->pw_expiration, 
                   mask, KADM5_PW_EXPIRATION)) {
          krb5_warnx (context, "unable to parse `%s'", pw_expiration);
          return 1;
      }
    }
    if (attributes != NULL) {
      if (parse_attributes (attributes, &ent->attributes, 
                        mask, KADM5_ATTRIBUTES)) {
          krb5_warnx (context, "unable to parse `%s'", attributes);
          return 1;
      }
    }
    return 0;
}

/*
 * Does `string' contain any globing characters?
 */

static int
is_expression(const char *string)
{
    const char *p;
    int quote = 0;

    for(p = string; *p; p++) {
      if(quote) {
          quote = 0;
          continue;
      }
      if(*p == '\\')
          quote++;
      else if(strchr("[]*?", *p) != NULL) 
          return 1;
    }
    return 0;
}

/* loop over all principals matching exp */
int
foreach_principal(const char *exp, 
              int (*func)(krb5_principal, void*), 
              const char *funcname,
              void *data)
{
    char **princs;
    int num_princs;
    int i;
    krb5_error_code ret;
    krb5_principal princ_ent;
    int is_expr;

    /* if this isn't an expression, there is no point in wading
       through the whole database looking for matches */
    is_expr = is_expression(exp);
    if(is_expr)
      ret = kadm5_get_principals(kadm_handle, exp, &princs, &num_princs);
    if(!is_expr || ret == KADM5_AUTH_LIST) {
      /* we might be able to perform the requested opreration even
           if we're not allowed to list principals */
      num_princs = 1;
      princs = malloc(sizeof(*princs));
      if(princs == NULL)
          return ENOMEM;
      princs[0] = strdup(exp);
      if(princs[0] == NULL){ 
          free(princs);
          return ENOMEM;
      }
    } else if(ret) {
      krb5_warn(context, ret, "kadm5_get_principals");
      return ret;
    }
    for(i = 0; i < num_princs; i++) {
      ret = krb5_parse_name(context, princs[i], &princ_ent);
      if(ret){
          krb5_warn(context, ret, "krb5_parse_name(%s)", princs[i]);
          continue;
      }
      ret = (*func)(princ_ent, data);
      if(ret)
          krb5_warn(context, ret, "%s %s", funcname, princs[i]);
      krb5_free_principal(context, princ_ent);
    }
    kadm5_free_name_list(kadm_handle, princs, &num_princs);
    return 0;
}

/*
 * prompt with `prompt' and default value `def', and store the reply
 * in `buf, len'
 */

#include <setjmp.h>

static jmp_buf jmpbuf;

static void
interrupt(int sig)
{
    longjmp(jmpbuf, 1);
}

static int
get_response(const char *prompt, const char *def, char *buf, size_t len)
{
    char *p;
    void (*osig)(int);

    osig = signal(SIGINT, interrupt);
    if(setjmp(jmpbuf)) {
      signal(SIGINT, osig);
      printf("\n");
      return 1;
    }

    printf("%s [%s]:", prompt, def);
    if(fgets(buf, len, stdin) == NULL) {
      int save_errno = errno;
      if(ferror(stdin))
          krb5_err(context, 1, save_errno, "<stdin>");
      signal(SIGINT, osig);
      return 1;
    }
    p = strchr(buf, '\n');
    if(p)
      *p = '\0';
    if(strcmp(buf, "") == 0)
      strlcpy(buf, def, len);
    signal(SIGINT, osig);
    return 0;
}

/*
 * return [0, 16) or -1
 */

static int
hex2n (char c)
{
    static char hexdigits[] = "0123456789abcdef";
    const char *p;

    p = strchr (hexdigits, tolower((unsigned char)c));
    if (p == NULL)
      return -1;
    else
      return p - hexdigits;
}

/*
 * convert a key in a readable format into a keyblock.
 * return 0 iff succesful, otherwise `err' should point to an error message
 */

int
parse_des_key (const char *key_string, krb5_key_data *key_data,
             const char **err)
{
    const char *p = key_string;
    unsigned char bits[8];
    int i;

    if (strlen (key_string) != 16) {
      *err = "bad length, should be 16 for DES key";
      return 1;
    }
    for (i = 0; i < 8; ++i) {
      int d1, d2;

      d1 = hex2n(p[2 * i]);
      d2 = hex2n(p[2 * i + 1]);
      if (d1 < 0 || d2 < 0) {
          *err = "non-hex character";
          return 1;
      }
      bits[i] = (d1 << 4) | d2;
    }
    for (i = 0; i < 3; ++i) {
      key_data[i].key_data_ver  = 2;
      key_data[i].key_data_kvno = 0;
      /* key */
      key_data[i].key_data_type[0]     = ETYPE_DES_CBC_CRC;
      key_data[i].key_data_length[0]   = 8;
      key_data[i].key_data_contents[0] = malloc(8);
      memcpy (key_data[i].key_data_contents[0], bits, 8);
      /* salt */
      key_data[i].key_data_type[1]     = KRB5_PW_SALT;
      key_data[i].key_data_length[1]   = 0;
      key_data[i].key_data_contents[1] = NULL;
    }
    key_data[0].key_data_type[0] = ETYPE_DES_CBC_MD5;
    key_data[1].key_data_type[0] = ETYPE_DES_CBC_MD4;
    return 0;
}

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