643 lines
15 KiB
C
643 lines
15 KiB
C
/*
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* Copyright (c) 1997 - 2001 Kungliga Tekniska Högskolan
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* (Royal Institute of Technology, Stockholm, Sweden).
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include "kadmin_locl.h"
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#include <parse_units.h>
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RCSID("$Id: util.c,v 1.36 2001/08/27 23:07:36 assar Exp $");
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/*
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* util.c - functions for parsing, unparsing, and editing different
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* types of data used in kadmin.
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*/
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static int
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get_response(const char *prompt, const char *def, char *buf, size_t len);
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/*
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* attributes
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*/
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struct units kdb_attrs[] = {
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{ "new-princ", KRB5_KDB_NEW_PRINC },
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{ "support-desmd5", KRB5_KDB_SUPPORT_DESMD5 },
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{ "pwchange-service", KRB5_KDB_PWCHANGE_SERVICE },
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{ "disallow-svr", KRB5_KDB_DISALLOW_SVR },
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{ "requires-pw-change", KRB5_KDB_REQUIRES_PWCHANGE },
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{ "requires-hw-auth", KRB5_KDB_REQUIRES_HW_AUTH },
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{ "requires-pre-auth", KRB5_KDB_REQUIRES_PRE_AUTH },
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{ "disallow-all-tix", KRB5_KDB_DISALLOW_ALL_TIX },
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{ "disallow-dup-skey", KRB5_KDB_DISALLOW_DUP_SKEY },
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{ "disallow-proxiable", KRB5_KDB_DISALLOW_PROXIABLE },
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{ "disallow-renewable", KRB5_KDB_DISALLOW_RENEWABLE },
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{ "disallow-tgt-based", KRB5_KDB_DISALLOW_TGT_BASED },
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{ "disallow-forwardable", KRB5_KDB_DISALLOW_FORWARDABLE },
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{ "disallow-postdated", KRB5_KDB_DISALLOW_POSTDATED },
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{ NULL }
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};
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/*
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* convert the attributes in `attributes' into a printable string
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* in `str, len'
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*/
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void
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attributes2str(krb5_flags attributes, char *str, size_t len)
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{
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unparse_flags (attributes, kdb_attrs, str, len);
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}
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/*
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* convert the string in `str' into attributes in `flags'
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* return 0 if parsed ok, else -1.
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*/
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int
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str2attributes(const char *str, krb5_flags *flags)
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{
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int res;
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res = parse_flags (str, kdb_attrs, *flags);
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if (res < 0)
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return res;
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else {
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*flags = res;
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return 0;
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}
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}
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/*
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* try to parse the string `resp' into attributes in `attr', also
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* setting the `bit' in `mask' if attributes are given and valid.
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*/
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int
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parse_attributes (const char *resp, krb5_flags *attr, int *mask, int bit)
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{
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krb5_flags tmp = *attr;
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if (str2attributes(resp, &tmp) == 0) {
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*attr = tmp;
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if (mask)
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*mask |= bit;
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return 0;
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} else if(*resp == '?') {
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print_flags_table (kdb_attrs, stderr);
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} else {
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fprintf (stderr, "Unable to parse '%s'\n", resp);
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}
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return -1;
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}
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/*
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* allow the user to edit the attributes in `attr', prompting with `prompt'
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*/
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int
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edit_attributes (const char *prompt, krb5_flags *attr, int *mask, int bit)
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{
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char buf[1024], resp[1024];
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if (mask && (*mask & bit))
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return 0;
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attributes2str(*attr, buf, sizeof(buf));
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for (;;) {
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if(get_response("Attributes", buf, resp, sizeof(resp)) != 0)
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return 1;
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if (resp[0] == '\0')
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break;
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if (parse_attributes (resp, attr, mask, bit) == 0)
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break;
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}
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return 0;
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}
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/*
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* time_t
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* the special value 0 means ``never''
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*/
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/*
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* Convert the time `t' to a string representation in `str' (of max
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* size `len'). If include_time also include time, otherwise just
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* date.
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*/
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void
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time_t2str(time_t t, char *str, size_t len, int include_time)
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{
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if(t) {
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if(include_time)
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strftime(str, len, "%Y-%m-%d %H:%M:%S UTC", gmtime(&t));
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else
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strftime(str, len, "%Y-%m-%d", gmtime(&t));
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} else
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snprintf(str, len, "never");
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}
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/*
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* Convert the time representation in `str' to a time in `time'.
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* Return 0 if succesful, else -1.
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*/
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int
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str2time_t (const char *str, time_t *t)
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{
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const char *p;
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struct tm tm, tm2;
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memset (&tm, 0, sizeof (tm));
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if(strcasecmp(str, "never") == 0) {
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*t = 0;
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return 0;
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}
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if(strcasecmp(str, "now") == 0) {
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*t = time(NULL);
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return 0;
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}
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p = strptime (str, "%Y-%m-%d", &tm);
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if (p == NULL)
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return -1;
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/* Do it on the end of the day */
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tm2.tm_hour = 23;
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tm2.tm_min = 59;
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tm2.tm_sec = 59;
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if(strptime (p, "%H:%M:%S", &tm2) != NULL) {
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tm.tm_hour = tm2.tm_hour;
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tm.tm_min = tm2.tm_min;
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tm.tm_sec = tm2.tm_sec;
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}
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*t = tm2time (tm, 0);
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return 0;
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}
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/*
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* try to parse the time in `resp' storing it in `value'
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*/
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int
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parse_timet (const char *resp, krb5_timestamp *value, int *mask, int bit)
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{
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time_t tmp;
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if (str2time_t(resp, &tmp) == 0) {
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*value = tmp;
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if(mask)
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*mask |= bit;
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return 0;
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} else if(*resp == '?') {
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printf ("Print date on format YYYY-mm-dd [hh:mm:ss]\n");
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} else {
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fprintf (stderr, "Unable to parse time '%s'\n", resp);
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}
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return -1;
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}
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/*
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* allow the user to edit the time in `value'
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*/
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int
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edit_timet (const char *prompt, krb5_timestamp *value, int *mask, int bit)
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{
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char buf[1024], resp[1024];
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if (mask && (*mask & bit))
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return 0;
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time_t2str (*value, buf, sizeof (buf), 0);
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for (;;) {
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if(get_response(prompt, buf, resp, sizeof(resp)) != 0)
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return 1;
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if (parse_timet (resp, value, mask, bit) == 0)
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break;
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}
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return 0;
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}
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/*
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* deltat
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* the special value 0 means ``unlimited''
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*/
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/*
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* convert the delta_t value in `t' into a printable form in `str, len'
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*/
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void
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deltat2str(unsigned t, char *str, size_t len)
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{
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if(t == 0 || t == INT_MAX)
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snprintf(str, len, "unlimited");
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else
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unparse_time(t, str, len);
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}
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/*
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* parse the delta value in `str', storing result in `*delta'
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* return 0 if ok, else -1
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*/
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int
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str2deltat(const char *str, krb5_deltat *delta)
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{
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int res;
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if(strcasecmp(str, "unlimited") == 0) {
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*delta = 0;
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return 0;
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}
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res = parse_time(str, "day");
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if (res < 0)
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return res;
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else {
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*delta = res;
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return 0;
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}
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}
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/*
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* try to parse the string in `resp' into a deltad in `value'
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* `mask' will get the bit `bit' set if a value was given.
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*/
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int
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parse_deltat (const char *resp, krb5_deltat *value, int *mask, int bit)
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{
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krb5_deltat tmp;
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if (str2deltat(resp, &tmp) == 0) {
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*value = tmp;
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if (mask)
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*mask |= bit;
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return 0;
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} else if(*resp == '?') {
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print_time_table (stderr);
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} else {
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fprintf (stderr, "Unable to parse time '%s'\n", resp);
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}
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return -1;
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}
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/*
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* allow the user to edit the deltat in `value'
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*/
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int
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edit_deltat (const char *prompt, krb5_deltat *value, int *mask, int bit)
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{
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char buf[1024], resp[1024];
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if (mask && (*mask & bit))
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return 0;
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deltat2str(*value, buf, sizeof(buf));
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for (;;) {
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if(get_response(prompt, buf, resp, sizeof(resp)) != 0)
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return 1;
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if (parse_deltat (resp, value, mask, bit) == 0)
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break;
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}
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return 0;
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}
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/*
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* allow the user to edit `ent'
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*/
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void
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set_defaults(kadm5_principal_ent_t ent, int *mask,
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kadm5_principal_ent_t default_ent, int default_mask)
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{
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if (default_ent
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&& (default_mask & KADM5_MAX_LIFE)
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&& !(*mask & KADM5_MAX_LIFE))
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ent->max_life = default_ent->max_life;
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if (default_ent
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&& (default_mask & KADM5_MAX_RLIFE)
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&& !(*mask & KADM5_MAX_RLIFE))
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ent->max_renewable_life = default_ent->max_renewable_life;
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if (default_ent
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&& (default_mask & KADM5_PRINC_EXPIRE_TIME)
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&& !(*mask & KADM5_PRINC_EXPIRE_TIME))
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ent->princ_expire_time = default_ent->princ_expire_time;
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if (default_ent
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&& (default_mask & KADM5_PW_EXPIRATION)
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&& !(*mask & KADM5_PW_EXPIRATION))
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ent->pw_expiration = default_ent->pw_expiration;
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if (default_ent
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&& (default_mask & KADM5_ATTRIBUTES)
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&& !(*mask & KADM5_ATTRIBUTES))
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ent->attributes = default_ent->attributes & ~KRB5_KDB_DISALLOW_ALL_TIX;
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}
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int
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edit_entry(kadm5_principal_ent_t ent, int *mask,
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kadm5_principal_ent_t default_ent, int default_mask)
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{
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set_defaults(ent, mask, default_ent, default_mask);
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if(edit_deltat ("Max ticket life", &ent->max_life, mask,
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KADM5_MAX_LIFE) != 0)
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return 1;
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if(edit_deltat ("Max renewable life", &ent->max_renewable_life, mask,
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KADM5_MAX_RLIFE) != 0)
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return 1;
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if(edit_timet ("Principal expiration time", &ent->princ_expire_time, mask,
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KADM5_PRINC_EXPIRE_TIME) != 0)
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return 1;
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if(edit_timet ("Password expiration time", &ent->pw_expiration, mask,
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KADM5_PW_EXPIRATION) != 0)
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return 1;
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if(edit_attributes ("Attributes", &ent->attributes, mask,
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KADM5_ATTRIBUTES) != 0)
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return 1;
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return 0;
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}
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/*
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* Parse the arguments, set the fields in `ent' and the `mask' for the
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* entries having been set.
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* Return 1 on failure and 0 on success.
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*/
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int
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set_entry(krb5_context context,
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kadm5_principal_ent_t ent,
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int *mask,
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const char *max_ticket_life,
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const char *max_renewable_life,
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const char *expiration,
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const char *pw_expiration,
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const char *attributes)
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{
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if (max_ticket_life != NULL) {
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if (parse_deltat (max_ticket_life, &ent->max_life,
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mask, KADM5_MAX_LIFE)) {
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krb5_warnx (context, "unable to parse `%s'", max_ticket_life);
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return 1;
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}
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}
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if (max_renewable_life != NULL) {
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if (parse_deltat (max_renewable_life, &ent->max_renewable_life,
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mask, KADM5_MAX_RLIFE)) {
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krb5_warnx (context, "unable to parse `%s'", max_renewable_life);
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return 1;
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}
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}
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if (expiration) {
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if (parse_timet (expiration, &ent->princ_expire_time,
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mask, KADM5_PRINC_EXPIRE_TIME)) {
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krb5_warnx (context, "unable to parse `%s'", expiration);
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return 1;
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}
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}
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if (pw_expiration) {
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if (parse_timet (pw_expiration, &ent->pw_expiration,
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mask, KADM5_PW_EXPIRATION)) {
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krb5_warnx (context, "unable to parse `%s'", pw_expiration);
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return 1;
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}
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}
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if (attributes != NULL) {
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if (parse_attributes (attributes, &ent->attributes,
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mask, KADM5_ATTRIBUTES)) {
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krb5_warnx (context, "unable to parse `%s'", attributes);
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return 1;
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}
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}
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return 0;
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}
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/*
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* Does `string' contain any globing characters?
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*/
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static int
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is_expression(const char *string)
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{
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const char *p;
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int quote = 0;
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for(p = string; *p; p++) {
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if(quote) {
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quote = 0;
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continue;
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}
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if(*p == '\\')
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quote++;
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else if(strchr("[]*?", *p) != NULL)
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return 1;
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}
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return 0;
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}
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/* loop over all principals matching exp */
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int
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foreach_principal(const char *exp,
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int (*func)(krb5_principal, void*),
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const char *funcname,
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void *data)
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{
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char **princs;
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int num_princs;
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int i;
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krb5_error_code ret;
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krb5_principal princ_ent;
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int is_expr;
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/* if this isn't an expression, there is no point in wading
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through the whole database looking for matches */
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is_expr = is_expression(exp);
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if(is_expr)
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ret = kadm5_get_principals(kadm_handle, exp, &princs, &num_princs);
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if(!is_expr || ret == KADM5_AUTH_LIST) {
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/* we might be able to perform the requested opreration even
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if we're not allowed to list principals */
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num_princs = 1;
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princs = malloc(sizeof(*princs));
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if(princs == NULL)
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return ENOMEM;
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princs[0] = strdup(exp);
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if(princs[0] == NULL){
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free(princs);
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return ENOMEM;
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}
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} else if(ret) {
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krb5_warn(context, ret, "kadm5_get_principals");
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return ret;
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}
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for(i = 0; i < num_princs; i++) {
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ret = krb5_parse_name(context, princs[i], &princ_ent);
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if(ret){
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krb5_warn(context, ret, "krb5_parse_name(%s)", princs[i]);
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continue;
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}
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ret = (*func)(princ_ent, data);
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if(ret)
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krb5_warn(context, ret, "%s %s", funcname, princs[i]);
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krb5_free_principal(context, princ_ent);
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}
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kadm5_free_name_list(kadm_handle, princs, &num_princs);
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return 0;
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}
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/*
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* prompt with `prompt' and default value `def', and store the reply
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* in `buf, len'
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*/
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#include <setjmp.h>
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static sig_atomic_t num_intrs;
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static jmp_buf jmpbuf;
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static void
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interrupt(int sig)
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{
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longjmp(jmpbuf, 1);
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}
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static int
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get_response(const char *prompt, const char *def, char *buf, size_t len)
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{
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char *p;
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void (*osig)(int);
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num_intrs = 0;
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osig = signal(SIGINT, interrupt);
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if(setjmp(jmpbuf)) {
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signal(SIGINT, osig);
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return 1;
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}
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printf("%s [%s]:", prompt, def);
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if(fgets(buf, len, stdin) == NULL) {
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int save_errno = errno;
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if(ferror(stdin))
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krb5_err(context, 1, save_errno, "<stdin>");
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signal(SIGINT, osig);
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return 1;
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}
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p = strchr(buf, '\n');
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if(p)
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*p = '\0';
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if(strcmp(buf, "") == 0)
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strlcpy(buf, def, len);
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signal(SIGINT, osig);
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return 0;
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}
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/*
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* return [0, 16) or -1
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*/
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static int
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hex2n (char c)
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{
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static char hexdigits[] = "0123456789abcdef";
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const char *p;
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p = strchr (hexdigits, tolower((int)c));
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if (p == NULL)
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return -1;
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else
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return p - hexdigits;
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}
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/*
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* convert a key in a readable format into a keyblock.
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* return 0 iff succesful, otherwise `err' should point to an error message
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*/
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int
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parse_des_key (const char *key_string, krb5_key_data *key_data,
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const char **err)
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{
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const char *p = key_string;
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unsigned char bits[8];
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int i;
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if (strlen (key_string) != 16) {
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*err = "bad length, should be 16 for DES key";
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return 1;
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}
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for (i = 0; i < 8; ++i) {
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int d1, d2;
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d1 = hex2n(p[2 * i]);
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d2 = hex2n(p[2 * i + 1]);
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if (d1 < 0 || d2 < 0) {
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*err = "non-hex character";
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return 1;
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}
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bits[i] = (d1 << 4) | d2;
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}
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for (i = 0; i < 3; ++i) {
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key_data[i].key_data_ver = 2;
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key_data[i].key_data_kvno = 0;
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/* key */
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key_data[i].key_data_type[0] = ETYPE_DES_CBC_CRC;
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key_data[i].key_data_length[0] = 8;
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key_data[i].key_data_contents[0] = malloc(8);
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memcpy (key_data[i].key_data_contents[0], bits, 8);
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/* salt */
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key_data[i].key_data_type[1] = KRB5_PW_SALT;
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key_data[i].key_data_length[1] = 0;
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key_data[i].key_data_contents[1] = NULL;
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}
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key_data[0].key_data_type[0] = ETYPE_DES_CBC_MD5;
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key_data[1].key_data_type[0] = ETYPE_DES_CBC_MD4;
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return 0;
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}
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