/*
* Request:
* NameZ
* UID
* GID
*
* Response:
*
*/
static krb5_error_code
kcm_op_chown(krb5_context context,
kcm_client *client,
kcm_operation opcode,
krb5_storage *request,
krb5_storage *response)
{
uint32_t uid;
uint32_t gid;
krb5_error_code ret;
kcm_ccache ccache;
char *name;
ret = krb5_ret_stringz(request, &name);
if (ret)
return ret;
KCM_LOG_REQUEST_NAME(context, client, opcode, name);
ret = krb5_ret_uint32(request, &uid);
if (ret) {
free(name);
return ret;
}
ret = krb5_ret_uint32(request, &gid);
if (ret) {
free(name);
return ret;
}
ret = kcm_ccache_resolve_client(context, client, opcode,
name, &ccache);
if (ret) {
free(name);
return ret;
}
ret = kcm_chown(context, client, ccache, uid, gid);
free(name);
kcm_release_ccache(context, ccache);
return ret;
}
krb5_error_code
kcm_ccache_new_client(krb5_context context,
kcm_client *client,
const char *name,
kcm_ccache *ccache_p)
{
krb5_error_code ret;
kcm_ccache ccache;
/* We insist the ccache name starts with UID or UID: */
if (name_constraints != 0) {
char prefix[64];
size_t prefix_len;
int bad = 1;
snprintf(prefix, sizeof(prefix), "%ld:", (long)client->uid);
prefix_len = strlen(prefix);
if (strncmp(name, prefix, prefix_len) == 0)
bad = 0;
else {
prefix[prefix_len - 1] = '\0';
if (strcmp(name, prefix) == 0)
bad = 0;
}
/* Allow root to create badly-named ccaches */
if (bad && !CLIENT_IS_ROOT(client))
return KRB5_CC_BADNAME;
}
ret = kcm_ccache_resolve(context, name, &ccache);
if (ret == 0) {
if ((ccache->uid != client->uid ||
ccache->gid != client->gid) && !CLIENT_IS_ROOT(client))
return KRB5_FCC_PERM;
} else if (ret != KRB5_FCC_NOFILE && !(CLIENT_IS_ROOT(client) && ret == KRB5_FCC_PERM)) {
return ret;
}
if (ret == KRB5_FCC_NOFILE) {
ret = kcm_ccache_new(context, name, &ccache);
if (ret) {
kcm_log(1, "Failed to initialize cache %s: %s",
name, krb5_get_err_text(context, ret));
return ret;
}
/* bind to current client */
ccache->uid = client->uid;
ccache->gid = client->gid;
ccache->session = client->session;
} else {
ret = kcm_zero_ccache_data(context, ccache);
if (ret) {
kcm_log(1, "Failed to empty cache %s: %s",
name, krb5_get_err_text(context, ret));
kcm_release_ccache(context, ccache);
return ret;
}
kcm_cleanup_events(context, ccache);
}
ret = kcm_access(context, client, KCM_OP_INITIALIZE, ccache);
if (ret) {
kcm_release_ccache(context, ccache);
kcm_ccache_destroy(context, name);
return ret;
}
/*
* Finally, if the user is root and the cache was created under
* another user's name, chown the cache to that user and their
* default gid.
*/
if (CLIENT_IS_ROOT(client)) {
unsigned long uid;
int matches = sscanf(name,"%ld:",&uid);
if (matches == 0)
matches = sscanf(name,"%ld",&uid);
if (matches == 1) {
struct passwd *pwd = getpwuid(uid);
if (pwd != NULL) {
gid_t gid = pwd->pw_gid;
kcm_chown(context, client, ccache, uid, gid);
}
}
}
*ccache_p = ccache;
return 0;
}
krb5_error_code
kcm_ccache_new_client(krb5_context context,
kcm_client *client,
const char *name,
kcm_ccache *ccache_p)
{
krb5_error_code ret;
kcm_ccache ccache;
ret = kcm_ccache_resolve_by_name(context, name, &ccache);
if (ret == 0) {
if ((ccache->uid != client->uid) && !CLIENT_IS_ROOT(client))
return KRB5_FCC_PERM;
} else if (ret != KRB5_FCC_NOFILE && !(CLIENT_IS_ROOT(client) && ret == KRB5_FCC_PERM)) {
return ret;
}
if (ret == KRB5_FCC_NOFILE) {
ret = kcm_ccache_new(context, name, &ccache);
if (ret) {
kcm_log(1, "Failed to initialize cache %s", name);
return ret;
}
/* bind to current client */
ccache->uid = client->uid;
ccache->session = client->session;
/*
* add notification when the session goes away, so we can
* remove the credential
*/
kcm_session_add(client->session);
} else {
ret = kcm_zero_ccache_data(context, ccache);
if (ret) {
kcm_log(1, "Failed to empty cache %s", name);
kcm_release_ccache(context, ccache);
return ret;
}
heim_ipc_event_cancel(ccache->renew_event);
heim_ipc_event_cancel(ccache->expire_event);
}
ret = kcm_access(context, client, KCM_OP_INITIALIZE, ccache);
if (ret) {
kcm_release_ccache(context, ccache);
kcm_ccache_destroy(context, name);
return ret;
}
/*
* Finally, if the user is root and the cache was created under
* another user's name, chown the cache to that user.
*/
if (CLIENT_IS_ROOT(client)) {
unsigned long uid;
int matches = sscanf(name,"%ld:",&uid);
if (matches == 0)
matches = sscanf(name,"%ld",&uid);
if (matches == 1) {
kcm_chown(context, client, ccache, (uid_t)uid);
}
}
*ccache_p = ccache;
return 0;
}