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| Current File : //usr/src/crypto/heimdal/kadmin/util.c |
/*
* Copyright (c) 1997 - 2006 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 21745 2007-07-31 16:11:25Z lha $");
/*
* 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[] = {
{ "allow-digest", KRB5_KDB_ALLOW_DIGEST },
{ "allow-kerberos4", KRB5_KDB_ALLOW_KERBEROS4 },
{ "trusted-for-delegation", KRB5_KDB_TRUSTED_FOR_DELEGATION },
{ "ok-as-delegate", KRB5_KDB_OK_AS_DELEGATE },
{ "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));
memset (&tm2, 0, sizeof (tm2));
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;
while(isspace((unsigned char)*p))
p++;
/* XXX this is really a bit optimistic, we should really complain
if there was a problem parsing the time */
if(p[0] != '\0' && 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;
} else {
/* Do it on the end of the day */
tm.tm_hour = 23;
tm.tm_min = 59;
tm.tm_sec = 59;
}
*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;
}
if(*resp != '?')
fprintf (stderr, "Unable to parse time \"%s\"\n", resp);
fprintf (stderr, "Print date on format YYYY-mm-dd [hh:mm:ss]\n");
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. If any of calls to `func'
* failes, the first error is returned when all principals are
* processed.
*/
int
foreach_principal(const char *exp_str,
int (*func)(krb5_principal, void*),
const char *funcname,
void *data)
{
char **princs;
int num_princs;
int i;
krb5_error_code saved_ret = 0, ret = 0;
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_str);
if(is_expr)
ret = kadm5_get_principals(kadm_handle, exp_str, &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_str);
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_clear_error_string(context);
krb5_warn(context, ret, "%s %s", funcname, princs[i]);
if (saved_ret == 0)
saved_ret = ret;
}
krb5_free_principal(context, princ_ent);
}
if (ret == 0 && saved_ret != 0)
ret = saved_ret;
kadm5_free_name_list(kadm_handle, princs, &num_princs);
return ret;
}
/*
* 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);
fprintf(stderr, "\n");
return 1;
}
fprintf(stderr, "%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 **error)
{
const char *p = key_string;
unsigned char bits[8];
int i;
if (strlen (key_string) != 16) {
*error = "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) {
*error = "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);
if (key_data[i].key_data_contents[0] == NULL) {
*error = "malloc";
return ENOMEM;
}
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;
}