/*
* Copyright (c) 1997 - 2005 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 "krb5_locl.h"
/**
* @page krb5_keytab_intro The keytab handing functions
* @section section_krb5_keytab Kerberos Keytabs
*
* See the library functions here: @ref krb5_keytab
*
* Keytabs are long term key storage for servers, their equvalment of
* password files.
*
* Normally the only function that useful for server are to specify
* what keytab to use to other core functions like krb5_rd_req()
* krb5_kt_resolve(), and krb5_kt_close().
*
* @subsection krb5_keytab_names Keytab names
*
* A keytab name is on the form type:residual. The residual part is
* specific to each keytab-type.
*
* When a keytab-name is resolved, the type is matched with an internal
* list of keytab types. If there is no matching keytab type,
* the default keytab is used. The current default type is FILE.
*
* The default value can be changed in the configuration file
* /etc/krb5.conf by setting the variable
* [defaults]default_keytab_name.
*
* The keytab types that are implemented in Heimdal are:
* - file
* store the keytab in a file, the type's name is FILE . The
* residual part is a filename. For compatibility with other
* Kerberos implemtation WRFILE and JAVA14 is also accepted. WRFILE
* has the same format as FILE. JAVA14 have a format that is
* compatible with older versions of MIT kerberos and SUN's Java
* based installation. They store a truncted kvno, so when the knvo
* excess 255, they are truncted in this format.
*
* - keytab
* store the keytab in a AFS keyfile (usually /usr/afs/etc/KeyFile ),
* the type's name is AFSKEYFILE. The residual part is a filename.
*
* - memory
* The keytab is stored in a memory segment. This allows sensitive
* and/or temporary data not to be stored on disk. The type's name
* is MEMORY. Each MEMORY keytab is referenced counted by and
* opened by the residual name, so two handles can point to the
* same memory area. When the last user closes using krb5_kt_close()
* the keytab, the keys in they keytab is memset() to zero and freed
* and can no longer be looked up by name.
*
*
* @subsection krb5_keytab_example Keytab example
*
* This is a minimalistic version of ktutil.
*
* @code
int
main (int argc, char **argv)
{
krb5_context context;
krb5_keytab keytab;
krb5_kt_cursor cursor;
krb5_keytab_entry entry;
krb5_error_code ret;
char *principal;
if (krb5_init_context (&context) != 0)
errx(1, "krb5_context");
ret = krb5_kt_default (context, &keytab);
if (ret)
krb5_err(context, 1, ret, "krb5_kt_default");
ret = krb5_kt_start_seq_get(context, keytab, &cursor);
if (ret)
krb5_err(context, 1, ret, "krb5_kt_start_seq_get");
while((ret = krb5_kt_next_entry(context, keytab, &entry, &cursor)) == 0){
krb5_unparse_name(context, entry.principal, &principal);
printf("principal: %s\n", principal);
free(principal);
krb5_kt_free_entry(context, &entry);
}
ret = krb5_kt_end_seq_get(context, keytab, &cursor);
if (ret)
krb5_err(context, 1, ret, "krb5_kt_end_seq_get");
ret = krb5_kt_close(context, keytab);
if (ret)
krb5_err(context, 1, ret, "krb5_kt_close");
krb5_free_context(context);
return 0;
}
* @endcode
*
*/
/**
* Register a new keytab backend.
*
* @param context a Keberos context.
* @param ops a backend to register.
*
* @return Return an error code or 0, see krb5_get_error_message().
*
* @ingroup krb5_keytab
*/
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_kt_register(krb5_context context,
const krb5_kt_ops *ops)
{
struct krb5_keytab_data *tmp;
if (strlen(ops->prefix) > KRB5_KT_PREFIX_MAX_LEN - 1) {
krb5_set_error_message(context, KRB5_KT_BADNAME,
N_("can't register cache type, prefix too long", ""));
return KRB5_KT_BADNAME;
}
tmp = realloc(context->kt_types,
(context->num_kt_types + 1) * sizeof(*context->kt_types));
if(tmp == NULL) {
krb5_set_error_message(context, ENOMEM,
N_("malloc: out of memory", ""));
return ENOMEM;
}
memcpy(&tmp[context->num_kt_types], ops,
sizeof(tmp[context->num_kt_types]));
context->kt_types = tmp;
context->num_kt_types++;
return 0;
}
static const char *
keytab_name(const char *name, const char **type, size_t *type_len)
{
const char *residual;
residual = strchr(name, ':');
if (residual == NULL ||
name[0] == '/'
#ifdef _WIN32
/* Avoid treating <drive>:<path> as a keytab type
* specification */
|| name + 1 == residual
#endif
) {
*type = "FILE";
*type_len = strlen(*type);
residual = name;
} else {
*type = name;
*type_len = residual - name;
residual++;
}
return residual;
}
/**
* Resolve the keytab name (of the form `type:residual') in `name'
* into a keytab in `id'.
*
* @param context a Keberos context.
* @param name name to resolve
* @param id resulting keytab, free with krb5_kt_close().
*
* @return Return an error code or 0, see krb5_get_error_message().
*
* @ingroup krb5_keytab
*/
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_kt_resolve(krb5_context context,
const char *name,
krb5_keytab *id)
{
krb5_keytab k;
int i;
const char *type, *residual;
size_t type_len;
krb5_error_code ret;
residual = keytab_name(name, &type, &type_len);
for(i = 0; i < context->num_kt_types; i++) {
if(strncasecmp(type, context->kt_types[i].prefix, type_len) == 0)
break;
}
if(i == context->num_kt_types) {
krb5_set_error_message(context, KRB5_KT_UNKNOWN_TYPE,
N_("unknown keytab type %.*s", "type"),
(int)type_len, type);
return KRB5_KT_UNKNOWN_TYPE;
}
k = malloc (sizeof(*k));
if (k == NULL) {
krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
return ENOMEM;
}
memcpy(k, &context->kt_types[i], sizeof(*k));
k->data = NULL;
ret = (*k->resolve)(context, residual, k);
if(ret) {
free(k);
k = NULL;
}
*id = k;
return ret;
}
/**
* copy the name of the default keytab into `name'.
*
* @param context a Keberos context.
* @param name buffer where the name will be written
* @param namesize length of name
*
* @return Return an error code or 0, see krb5_get_error_message().
*
* @ingroup krb5_keytab
*/
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_kt_default_name(krb5_context context, char *name, size_t namesize)
{
if (strlcpy (name, context->default_keytab, namesize) >= namesize) {
krb5_clear_error_message (context);
return KRB5_CONFIG_NOTENUFSPACE;
}
return 0;
}
/**
* Copy the name of the default modify keytab into `name'.
*
* @param context a Keberos context.
* @param name buffer where the name will be written
* @param namesize length of name
*
* @return Return an error code or 0, see krb5_get_error_message().
*
* @ingroup krb5_keytab
*/
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_kt_default_modify_name(krb5_context context, char *name, size_t namesize)
{
const char *kt = NULL;
if(context->default_keytab_modify == NULL) {
if(strncasecmp(context->default_keytab, "ANY:", 4) != 0)
kt = context->default_keytab;
else {
size_t len = strcspn(context->default_keytab + 4, ",");
if(len >= namesize) {
krb5_clear_error_message(context);
return KRB5_CONFIG_NOTENUFSPACE;
}
strlcpy(name, context->default_keytab + 4, namesize);
name[len] = '\0';
return 0;
}
} else
kt = context->default_keytab_modify;
if (strlcpy (name, kt, namesize) >= namesize) {
krb5_clear_error_message (context);
return KRB5_CONFIG_NOTENUFSPACE;
}
return 0;
}
/**
* Set `id' to the default keytab.
*
* @param context a Keberos context.
* @param id the new default keytab.
*
* @return Return an error code or 0, see krb5_get_error_message().
*
* @ingroup krb5_keytab
*/
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_kt_default(krb5_context context, krb5_keytab *id)
{
return krb5_kt_resolve (context, context->default_keytab, id);
}
/**
* Read the key identified by `(principal, vno, enctype)' from the
* keytab in `keyprocarg' (the default if == NULL) into `*key'.
*
* @param context a Keberos context.
* @param keyprocarg
* @param principal
* @param vno
* @param enctype
* @param key
*
* @return Return an error code or 0, see krb5_get_error_message().
*
* @ingroup krb5_keytab
*/
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_kt_read_service_key(krb5_context context,
krb5_pointer keyprocarg,
krb5_principal principal,
krb5_kvno vno,
krb5_enctype enctype,
krb5_keyblock **key)
{
krb5_keytab keytab;
krb5_keytab_entry entry;
krb5_error_code ret;
if (keyprocarg)
ret = krb5_kt_resolve (context, keyprocarg, &keytab);
else
ret = krb5_kt_default (context, &keytab);
if (ret)
return ret;
ret = krb5_kt_get_entry (context, keytab, principal, vno, enctype, &entry);
krb5_kt_close (context, keytab);
if (ret)
return ret;
ret = krb5_copy_keyblock (context, &entry.keyblock, key);
krb5_kt_free_entry(context, &entry);
return ret;
}
/**
* Return the type of the `keytab' in the string `prefix of length
* `prefixsize'.
*
* @param context a Keberos context.
* @param keytab the keytab to get the prefix for
* @param prefix prefix buffer
* @param prefixsize length of prefix buffer
*
* @return Return an error code or 0, see krb5_get_error_message().
*
* @ingroup krb5_keytab
*/
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_kt_get_type(krb5_context context,
krb5_keytab keytab,
char *prefix,
size_t prefixsize)
{
strlcpy(prefix, keytab->prefix, prefixsize);
return 0;
}
/**
* Retrieve the name of the keytab `keytab' into `name', `namesize'
*
* @param context a Keberos context.
* @param keytab the keytab to get the name for.
* @param name name buffer.
* @param namesize size of name buffer.
*
* @return Return an error code or 0, see krb5_get_error_message().
*
* @ingroup krb5_keytab
*/
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_kt_get_name(krb5_context context,
krb5_keytab keytab,
char *name,
size_t namesize)
{
return (*keytab->get_name)(context, keytab, name, namesize);
}
/**
* Retrieve the full name of the keytab `keytab' and store the name in
* `str'.
*
* @param context a Keberos context.
* @param keytab keytab to get name for.
* @param str the name of the keytab name, usee krb5_xfree() to free
* the string. On error, *str is set to NULL.
*
* @return Return an error code or 0, see krb5_get_error_message().
*
* @ingroup krb5_keytab
*/
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_kt_get_full_name(krb5_context context,
krb5_keytab keytab,
char **str)
{
char type[KRB5_KT_PREFIX_MAX_LEN];
char name[MAXPATHLEN];
krb5_error_code ret;
*str = NULL;
ret = krb5_kt_get_type(context, keytab, type, sizeof(type));
if (ret)
return ret;
ret = krb5_kt_get_name(context, keytab, name, sizeof(name));
if (ret)
return ret;
if (asprintf(str, "%s:%s", type, name) == -1) {
krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
*str = NULL;
return ENOMEM;
}
return 0;
}
/**
* Finish using the keytab in `id'. All resources will be released,
* even on errors.
*
* @param context a Keberos context.
* @param id keytab to close.
*
* @return Return an error code or 0, see krb5_get_error_message().
*
* @ingroup krb5_keytab
*/
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_kt_close(krb5_context context,
krb5_keytab id)
{
krb5_error_code ret;
ret = (*id->close)(context, id);
memset(id, 0, sizeof(*id));
free(id);
return ret;
}
/**
* Destroy (remove) the keytab in `id'. All resources will be released,
* even on errors, does the equvalment of krb5_kt_close() on the resources.
*
* @param context a Keberos context.
* @param id keytab to destroy.
*
* @return Return an error code or 0, see krb5_get_error_message().
*
* @ingroup krb5_keytab
*/
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_kt_destroy(krb5_context context,
krb5_keytab id)
{
krb5_error_code ret;
ret = (*id->destroy)(context, id);
krb5_kt_close(context, id);
return ret;
}
/*
* Match any aliases in keytab `entry' with `principal'.
*/
static krb5_boolean
compare_aliseses(krb5_context context,
krb5_keytab_entry *entry,
krb5_const_principal principal)
{
unsigned int i;
if (entry->aliases == NULL)
return FALSE;
for (i = 0; i < entry->aliases->len; i++)
if (krb5_principal_compare(context, &entry->aliases->val[i], principal))
return TRUE;
return FALSE;
}
/**
* Compare `entry' against `principal, vno, enctype'.
* Any of `principal, vno, enctype' might be 0 which acts as a wildcard.
* Return TRUE if they compare the same, FALSE otherwise.
*
* @param context a Keberos context.
* @param entry an entry to match with.
* @param principal principal to match, NULL matches all principals.
* @param vno key version to match, 0 matches all key version numbers.
* @param enctype encryption type to match, 0 matches all encryption types.
*
* @return Return TRUE or match, FALSE if not matched.
*
* @ingroup krb5_keytab
*/
KRB5_LIB_FUNCTION krb5_boolean KRB5_LIB_CALL
krb5_kt_compare(krb5_context context,
krb5_keytab_entry *entry,
krb5_const_principal principal,
krb5_kvno vno,
krb5_enctype enctype)
{
if(principal != NULL &&
!(krb5_principal_compare(context, entry->principal, principal) ||
compare_aliseses(context, entry, principal)))
return FALSE;
if(vno && vno != entry->vno)
return FALSE;
if(enctype && enctype != entry->keyblock.keytype)
return FALSE;
return TRUE;
}
krb5_error_code
_krb5_kt_principal_not_found(krb5_context context,
krb5_error_code ret,
krb5_keytab id,
krb5_const_principal principal,
krb5_enctype enctype,
int kvno)
{
char princ[256], kvno_str[25], *kt_name;
char *enctype_str = NULL;
krb5_unparse_name_fixed (context, principal, princ, sizeof(princ));
krb5_kt_get_full_name (context, id, &kt_name);
krb5_enctype_to_string(context, enctype, &enctype_str);
if (kvno)
snprintf(kvno_str, sizeof(kvno_str), "(kvno %d)", kvno);
else
kvno_str[0] = '\0';
krb5_set_error_message (context, ret,
N_("Failed to find %s%s in keytab %s (%s)",
"principal, kvno, keytab file, enctype"),
princ,
kvno_str,
kt_name ? kt_name : "unknown keytab",
enctype_str ? enctype_str : "unknown enctype");
free(kt_name);
free(enctype_str);
return ret;
}
/**
* Retrieve the keytab entry for `principal, kvno, enctype' into `entry'
* from the keytab `id'. Matching is done like krb5_kt_compare().
*
* @param context a Keberos context.
* @param id a keytab.
* @param principal principal to match, NULL matches all principals.
* @param kvno key version to match, 0 matches all key version numbers.
* @param enctype encryption type to match, 0 matches all encryption types.
* @param entry the returned entry, free with krb5_kt_free_entry().
*
* @return Return an error code or 0, see krb5_get_error_message().
*
* @ingroup krb5_keytab
*/
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_kt_get_entry(krb5_context context,
krb5_keytab id,
krb5_const_principal principal,
krb5_kvno kvno,
krb5_enctype enctype,
krb5_keytab_entry *entry)
{
krb5_keytab_entry tmp;
krb5_error_code ret;
krb5_kt_cursor cursor;
if(id->get)
return (*id->get)(context, id, principal, kvno, enctype, entry);
ret = krb5_kt_start_seq_get (context, id, &cursor);
if (ret) {
/* This is needed for krb5_verify_init_creds, but keep error
* string from previous error for the human. */
context->error_code = KRB5_KT_NOTFOUND;
return KRB5_KT_NOTFOUND;
}
entry->vno = 0;
while (krb5_kt_next_entry(context, id, &tmp, &cursor) == 0) {
if (krb5_kt_compare(context, &tmp, principal, 0, enctype)) {
/* the file keytab might only store the lower 8 bits of
the kvno, so only compare those bits */
if (kvno == tmp.vno
|| (tmp.vno < 256 && kvno % 256 == tmp.vno)) {
krb5_kt_copy_entry_contents (context, &tmp, entry);
krb5_kt_free_entry (context, &tmp);
krb5_kt_end_seq_get(context, id, &cursor);
return 0;
} else if (kvno == 0 && tmp.vno > entry->vno) {
if (entry->vno)
krb5_kt_free_entry (context, entry);
krb5_kt_copy_entry_contents (context, &tmp, entry);
}
}
krb5_kt_free_entry(context, &tmp);
}
krb5_kt_end_seq_get (context, id, &cursor);
if (entry->vno == 0)
return _krb5_kt_principal_not_found(context, KRB5_KT_NOTFOUND,
id, principal, enctype, kvno);
return 0;
}
/**
* Copy the contents of `in' into `out'.
*
* @param context a Keberos context.
* @param in the keytab entry to copy.
* @param out the copy of the keytab entry, free with krb5_kt_free_entry().
*
* @return Return an error code or 0, see krb5_get_error_message().
*
* @ingroup krb5_keytab
*/
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_kt_copy_entry_contents(krb5_context context,
const krb5_keytab_entry *in,
krb5_keytab_entry *out)
{
krb5_error_code ret;
memset(out, 0, sizeof(*out));
out->vno = in->vno;
ret = krb5_copy_principal (context, in->principal, &out->principal);
if (ret)
goto fail;
ret = krb5_copy_keyblock_contents (context,
&in->keyblock,
&out->keyblock);
if (ret)
goto fail;
out->timestamp = in->timestamp;
return 0;
fail:
krb5_kt_free_entry (context, out);
return ret;
}
/**
* Free the contents of `entry'.
*
* @param context a Keberos context.
* @param entry the entry to free
*
* @return Return an error code or 0, see krb5_get_error_message().
*
* @ingroup krb5_keytab
*/
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_kt_free_entry(krb5_context context,
krb5_keytab_entry *entry)
{
krb5_free_principal (context, entry->principal);
krb5_free_keyblock_contents (context, &entry->keyblock);
memset(entry, 0, sizeof(*entry));
return 0;
}
/**
* Set `cursor' to point at the beginning of `id'.
*
* @param context a Keberos context.
* @param id a keytab.
* @param cursor a newly allocated cursor, free with krb5_kt_end_seq_get().
*
* @return Return an error code or 0, see krb5_get_error_message().
*
* @ingroup krb5_keytab
*/
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_kt_start_seq_get(krb5_context context,
krb5_keytab id,
krb5_kt_cursor *cursor)
{
if(id->start_seq_get == NULL) {
krb5_set_error_message(context, HEIM_ERR_OPNOTSUPP,
N_("start_seq_get is not supported "
"in the %s keytab type", ""),
id->prefix);
return HEIM_ERR_OPNOTSUPP;
}
return (*id->start_seq_get)(context, id, cursor);
}
/**
* Get the next entry from keytab, advance the cursor. On last entry
* the function will return KRB5_KT_END.
*
* @param context a Keberos context.
* @param id a keytab.
* @param entry the returned entry, free with krb5_kt_free_entry().
* @param cursor the cursor of the iteration.
*
* @return Return an error code or 0, see krb5_get_error_message().
*
* @ingroup krb5_keytab
*/
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_kt_next_entry(krb5_context context,
krb5_keytab id,
krb5_keytab_entry *entry,
krb5_kt_cursor *cursor)
{
if(id->next_entry == NULL) {
krb5_set_error_message(context, HEIM_ERR_OPNOTSUPP,
N_("next_entry is not supported in the %s "
" keytab", ""),
id->prefix);
return HEIM_ERR_OPNOTSUPP;
}
return (*id->next_entry)(context, id, entry, cursor);
}
/**
* Release all resources associated with `cursor'.
*
* @param context a Keberos context.
* @param id a keytab.
* @param cursor the cursor to free.
*
* @return Return an error code or 0, see krb5_get_error_message().
*
* @ingroup krb5_keytab
*/
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_kt_end_seq_get(krb5_context context,
krb5_keytab id,
krb5_kt_cursor *cursor)
{
if(id->end_seq_get == NULL) {
krb5_set_error_message(context, HEIM_ERR_OPNOTSUPP,
"end_seq_get is not supported in the %s "
" keytab", id->prefix);
return HEIM_ERR_OPNOTSUPP;
}
return (*id->end_seq_get)(context, id, cursor);
}
/**
* Add the entry in `entry' to the keytab `id'.
*
* @param context a Keberos context.
* @param id a keytab.
* @param entry the entry to add
*
* @return Return an error code or 0, see krb5_get_error_message().
*
* @ingroup krb5_keytab
*/
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_kt_add_entry(krb5_context context,
krb5_keytab id,
krb5_keytab_entry *entry)
{
if(id->add == NULL) {
krb5_set_error_message(context, KRB5_KT_NOWRITE,
N_("Add is not supported in the %s keytab", ""),
id->prefix);
return KRB5_KT_NOWRITE;
}
entry->timestamp = time(NULL);
return (*id->add)(context, id,entry);
}
/**
* Remove an entry from the keytab, matching is done using
* krb5_kt_compare().
* @param context a Keberos context.
* @param id a keytab.
* @param entry the entry to remove
*
* @return Return an error code or 0, see krb5_get_error_message().
*
* @ingroup krb5_keytab
*/
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_kt_remove_entry(krb5_context context,
krb5_keytab id,
krb5_keytab_entry *entry)
{
if(id->remove == NULL) {
krb5_set_error_message(context, KRB5_KT_NOWRITE,
N_("Remove is not supported in the %s keytab", ""),
id->prefix);
return KRB5_KT_NOWRITE;
}
return (*id->remove)(context, id, entry);
}
/**
* Return true if the keytab exists and have entries
*
* @param context a Keberos context.
* @param id a keytab.
*
* @return Return an error code or 0, see krb5_get_error_message().
*
* @ingroup krb5_keytab
*/
KRB5_LIB_FUNCTION krb5_boolean KRB5_LIB_CALL
krb5_kt_have_content(krb5_context context,
krb5_keytab id)
{
krb5_keytab_entry entry;
krb5_kt_cursor cursor;
krb5_error_code ret;
char *name;
ret = krb5_kt_start_seq_get(context, id, &cursor);
if (ret)
goto notfound;
ret = krb5_kt_next_entry(context, id, &entry, &cursor);
krb5_kt_end_seq_get(context, id, &cursor);
if (ret)
goto notfound;
krb5_kt_free_entry(context, &entry);
return 0;
notfound:
ret = krb5_kt_get_full_name(context, id, &name);
if (ret == 0) {
krb5_set_error_message(context, KRB5_KT_NOTFOUND,
N_("No entry in keytab: %s", ""), name);
free(name);
}
return KRB5_KT_NOTFOUND;
}