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session.c
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/*
* rpcd - UBUS RPC server
*
* Copyright (C) 2013 Felix Fietkau <[email protected]>
* Copyright (C) 2013-2014 Jo-Philipp Wich <[email protected]>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#define _GNU_SOURCE /* crypt() */
#include <libubox/avl-cmp.h>
#include <libubox/blobmsg.h>
#include <libubox/utils.h>
#include <libubus.h>
#include <fnmatch.h>
#include <glob.h>
#include <uci.h>
#include <limits.h>
#ifdef HAVE_SHADOW
#include <shadow.h>
#endif
#include <rpcd/session.h>
static struct avl_tree sessions;
static struct blob_buf buf;
static LIST_HEAD(create_callbacks);
static LIST_HEAD(destroy_callbacks);
enum {
RPC_SN_TIMEOUT,
__RPC_SN_MAX,
};
static const struct blobmsg_policy new_policy[__RPC_SN_MAX] = {
[RPC_SN_TIMEOUT] = { .name = "timeout", .type = BLOBMSG_TYPE_INT32 },
};
enum {
RPC_SI_SID,
__RPC_SI_MAX,
};
static const struct blobmsg_policy sid_policy[__RPC_SI_MAX] = {
[RPC_SI_SID] = { .name = "ubus_rpc_session", .type = BLOBMSG_TYPE_STRING },
};
enum {
RPC_SS_SID,
RPC_SS_VALUES,
__RPC_SS_MAX,
};
static const struct blobmsg_policy set_policy[__RPC_SS_MAX] = {
[RPC_SS_SID] = { .name = "ubus_rpc_session", .type = BLOBMSG_TYPE_STRING },
[RPC_SS_VALUES] = { .name = "values", .type = BLOBMSG_TYPE_TABLE },
};
enum {
RPC_SG_SID,
RPC_SG_KEYS,
__RPC_SG_MAX,
};
static const struct blobmsg_policy get_policy[__RPC_SG_MAX] = {
[RPC_SG_SID] = { .name = "ubus_rpc_session", .type = BLOBMSG_TYPE_STRING },
[RPC_SG_KEYS] = { .name = "keys", .type = BLOBMSG_TYPE_ARRAY },
};
enum {
RPC_SA_SID,
RPC_SA_SCOPE,
RPC_SA_OBJECTS,
__RPC_SA_MAX,
};
static const struct blobmsg_policy acl_policy[__RPC_SA_MAX] = {
[RPC_SA_SID] = { .name = "ubus_rpc_session", .type = BLOBMSG_TYPE_STRING },
[RPC_SA_SCOPE] = { .name = "scope", .type = BLOBMSG_TYPE_STRING },
[RPC_SA_OBJECTS] = { .name = "objects", .type = BLOBMSG_TYPE_ARRAY },
};
enum {
RPC_SP_SID,
RPC_SP_SCOPE,
RPC_SP_OBJECT,
RPC_SP_FUNCTION,
__RPC_SP_MAX,
};
static const struct blobmsg_policy perm_policy[__RPC_SP_MAX] = {
[RPC_SP_SID] = { .name = "ubus_rpc_session", .type = BLOBMSG_TYPE_STRING },
[RPC_SP_SCOPE] = { .name = "scope", .type = BLOBMSG_TYPE_STRING },
[RPC_SP_OBJECT] = { .name = "object", .type = BLOBMSG_TYPE_STRING },
[RPC_SP_FUNCTION] = { .name = "function", .type = BLOBMSG_TYPE_STRING },
};
enum {
RPC_DUMP_SID,
RPC_DUMP_TIMEOUT,
RPC_DUMP_EXPIRES,
RPC_DUMP_DATA,
__RPC_DUMP_MAX,
};
static const struct blobmsg_policy dump_policy[__RPC_DUMP_MAX] = {
[RPC_DUMP_SID] = { .name = "ubus_rpc_session", .type = BLOBMSG_TYPE_STRING },
[RPC_DUMP_TIMEOUT] = { .name = "timeout", .type = BLOBMSG_TYPE_INT32 },
[RPC_DUMP_EXPIRES] = { .name = "expires", .type = BLOBMSG_TYPE_INT64 },
[RPC_DUMP_DATA] = { .name = "data", .type = BLOBMSG_TYPE_TABLE },
};
enum {
RPC_L_USERNAME,
RPC_L_PASSWORD,
RPC_L_TIMEOUT,
__RPC_L_MAX,
};
static const struct blobmsg_policy login_policy[__RPC_L_MAX] = {
[RPC_L_USERNAME] = { .name = "username", .type = BLOBMSG_TYPE_STRING },
[RPC_L_PASSWORD] = { .name = "password", .type = BLOBMSG_TYPE_STRING },
[RPC_L_TIMEOUT] = { .name = "timeout", .type = BLOBMSG_TYPE_INT32 },
};
/*
* Keys in the AVL tree contain all pattern characters up to the first wildcard.
* To look up entries, start with the last entry that has a key less than or
* equal to the method name, then work backwards as long as the AVL key still
* matches its counterpart in the object name
*/
#define uh_foreach_matching_acl_prefix(_acl, _avl, _obj, _func) \
for (_acl = avl_find_le_element(_avl, _obj, _acl, avl); \
_acl; \
_acl = avl_is_first(_avl, &(_acl)->avl) ? NULL : \
avl_prev_element((_acl), avl))
#define uh_foreach_matching_acl(_acl, _avl, _obj, _func) \
uh_foreach_matching_acl_prefix(_acl, _avl, _obj, _func) \
if (!strncmp((_acl)->object, _obj, (_acl)->sort_len) && \
!fnmatch((_acl)->object, (_obj), FNM_NOESCAPE) && \
!fnmatch((_acl)->function, (_func), FNM_NOESCAPE))
static int
rpc_random(char *dest)
{
unsigned char buf[16] = { 0 };
FILE *f;
int i;
int ret;
f = fopen("/dev/urandom", "r");
if (!f)
return -1;
ret = fread(buf, 1, sizeof(buf), f);
fclose(f);
if (ret < 0)
return ret;
for (i = 0; i < sizeof(buf); i++)
sprintf(dest + (i<<1), "%02x", buf[i]);
return 0;
}
static void
rpc_session_dump_data(struct rpc_session *ses, struct blob_buf *b)
{
struct rpc_session_data *d;
avl_for_each_element(&ses->data, d, avl) {
blobmsg_add_field(b, blobmsg_type(d->attr), blobmsg_name(d->attr),
blobmsg_data(d->attr), blobmsg_data_len(d->attr));
}
}
static void
rpc_session_dump_acls(struct rpc_session *ses, struct blob_buf *b)
{
struct rpc_session_acl *acl;
struct rpc_session_acl_scope *acl_scope;
const char *lastobj = NULL;
const char *lastscope = NULL;
void *c = NULL, *d = NULL;
avl_for_each_element(&ses->acls, acl_scope, avl) {
if (!lastscope || strcmp(acl_scope->avl.key, lastscope))
{
if (c) blobmsg_close_table(b, c);
c = blobmsg_open_table(b, acl_scope->avl.key);
lastobj = NULL;
}
d = NULL;
avl_for_each_element(&acl_scope->acls, acl, avl) {
if (!lastobj || strcmp(acl->object, lastobj))
{
if (d) blobmsg_close_array(b, d);
d = blobmsg_open_array(b, acl->object);
}
blobmsg_add_string(b, NULL, acl->function);
lastobj = acl->object;
}
if (d) blobmsg_close_array(b, d);
}
if (c) blobmsg_close_table(b, c);
}
static void
rpc_session_to_blob(struct rpc_session *ses, bool acls)
{
void *c;
blob_buf_init(&buf, 0);
blobmsg_add_string(&buf, "ubus_rpc_session", ses->id);
blobmsg_add_u32(&buf, "timeout", ses->timeout);
blobmsg_add_u64(&buf, "expires", uloop_timeout_remaining64(&ses->t) / 1000);
if (acls) {
c = blobmsg_open_table(&buf, "acls");
rpc_session_dump_acls(ses, &buf);
blobmsg_close_table(&buf, c);
}
c = blobmsg_open_table(&buf, "data");
rpc_session_dump_data(ses, &buf);
blobmsg_close_table(&buf, c);
}
static void
rpc_session_dump(struct rpc_session *ses, struct ubus_context *ctx,
struct ubus_request_data *req)
{
rpc_session_to_blob(ses, true);
ubus_send_reply(ctx, req, buf.head);
}
static void
rpc_touch_session(struct rpc_session *ses)
{
if (ses->timeout > 0)
uloop_timeout_set(&ses->t, ses->timeout * 1000);
}
static void
rpc_session_destroy(struct rpc_session *ses)
{
struct rpc_session_acl *acl, *nacl;
struct rpc_session_acl_scope *acl_scope, *nacl_scope;
struct rpc_session_data *data, *ndata;
struct rpc_session_cb *cb;
list_for_each_entry(cb, &destroy_callbacks, list)
cb->cb(ses, cb->priv);
uloop_timeout_cancel(&ses->t);
avl_for_each_element_safe(&ses->acls, acl_scope, avl, nacl_scope) {
avl_remove_all_elements(&acl_scope->acls, acl, avl, nacl)
free(acl);
avl_delete(&ses->acls, &acl_scope->avl);
free(acl_scope);
}
avl_remove_all_elements(&ses->data, data, avl, ndata)
free(data);
avl_delete(&sessions, &ses->avl);
free(ses);
}
static void rpc_session_timeout(struct uloop_timeout *t)
{
struct rpc_session *ses;
ses = container_of(t, struct rpc_session, t);
rpc_session_destroy(ses);
}
static struct rpc_session *
rpc_session_new(void)
{
struct rpc_session *ses;
ses = calloc(1, sizeof(*ses));
if (!ses)
return NULL;
ses->avl.key = ses->id;
avl_init(&ses->acls, avl_strcmp, true, NULL);
avl_init(&ses->data, avl_strcmp, false, NULL);
ses->t.cb = rpc_session_timeout;
return ses;
}
static struct rpc_session *
rpc_session_create(int timeout)
{
struct rpc_session *ses;
struct rpc_session_cb *cb;
ses = rpc_session_new();
if (!ses)
return NULL;
if (rpc_random(ses->id))
return NULL;
ses->timeout = timeout;
avl_insert(&sessions, &ses->avl);
rpc_touch_session(ses);
list_for_each_entry(cb, &create_callbacks, list)
cb->cb(ses, cb->priv);
return ses;
}
static struct rpc_session *
rpc_session_get(const char *id)
{
struct rpc_session *ses;
ses = avl_find_element(&sessions, id, ses, avl);
if (!ses)
return NULL;
rpc_touch_session(ses);
return ses;
}
static int
rpc_handle_create(struct ubus_context *ctx, struct ubus_object *obj,
struct ubus_request_data *req, const char *method,
struct blob_attr *msg)
{
struct rpc_session *ses;
struct blob_attr *tb;
int timeout = RPC_DEFAULT_SESSION_TIMEOUT;
blobmsg_parse(new_policy, __RPC_SN_MAX, &tb, blob_data(msg), blob_len(msg));
if (tb)
timeout = blobmsg_get_u32(tb);
ses = rpc_session_create(timeout);
if (ses)
rpc_session_dump(ses, ctx, req);
return 0;
}
static int
rpc_handle_list(struct ubus_context *ctx, struct ubus_object *obj,
struct ubus_request_data *req, const char *method,
struct blob_attr *msg)
{
struct rpc_session *ses;
struct blob_attr *tb;
blobmsg_parse(sid_policy, __RPC_SI_MAX, &tb, blob_data(msg), blob_len(msg));
if (!tb) {
avl_for_each_element(&sessions, ses, avl)
rpc_session_dump(ses, ctx, req);
return 0;
}
ses = rpc_session_get(blobmsg_data(tb));
if (!ses)
return UBUS_STATUS_NOT_FOUND;
rpc_session_dump(ses, ctx, req);
return 0;
}
static int
uh_id_len(const char *str)
{
return strcspn(str, "*?[");
}
static int
rpc_session_grant(struct rpc_session *ses,
const char *scope, const char *object, const char *function)
{
struct rpc_session_acl *acl;
struct rpc_session_acl_scope *acl_scope;
char *new_scope, *new_obj, *new_func, *new_id;
int id_len;
if (!object || !function)
return UBUS_STATUS_INVALID_ARGUMENT;
acl_scope = avl_find_element(&ses->acls, scope, acl_scope, avl);
if (acl_scope) {
uh_foreach_matching_acl_prefix(acl, &acl_scope->acls, object, function) {
if (!strcmp(acl->object, object) &&
!strcmp(acl->function, function))
return 0;
}
}
if (!acl_scope) {
acl_scope = calloc_a(sizeof(*acl_scope),
&new_scope, strlen(scope) + 1);
if (!acl_scope)
return UBUS_STATUS_UNKNOWN_ERROR;
acl_scope->avl.key = strcpy(new_scope, scope);
avl_init(&acl_scope->acls, avl_strcmp, true, NULL);
avl_insert(&ses->acls, &acl_scope->avl);
}
id_len = uh_id_len(object);
acl = calloc_a(sizeof(*acl),
&new_obj, strlen(object) + 1,
&new_func, strlen(function) + 1,
&new_id, id_len + 1);
if (!acl)
return UBUS_STATUS_UNKNOWN_ERROR;
acl->object = strcpy(new_obj, object);
acl->function = strcpy(new_func, function);
acl->avl.key = strncpy(new_id, object, id_len);
avl_insert(&acl_scope->acls, &acl->avl);
return 0;
}
static int
rpc_session_revoke(struct rpc_session *ses,
const char *scope, const char *object, const char *function)
{
struct rpc_session_acl *acl, *next;
struct rpc_session_acl_scope *acl_scope;
int id_len;
char *id;
acl_scope = avl_find_element(&ses->acls, scope, acl_scope, avl);
if (!acl_scope)
return 0;
if (!object && !function) {
avl_remove_all_elements(&acl_scope->acls, acl, avl, next)
free(acl);
avl_delete(&ses->acls, &acl_scope->avl);
free(acl_scope);
return 0;
}
id_len = uh_id_len(object);
id = alloca(id_len + 1);
strncpy(id, object, id_len);
id[id_len] = 0;
acl = avl_find_element(&acl_scope->acls, id, acl, avl);
while (acl) {
if (!avl_is_last(&acl_scope->acls, &acl->avl))
next = avl_next_element(acl, avl);
else
next = NULL;
if (strcmp(id, acl->avl.key) != 0)
break;
if (!strcmp(acl->object, object) &&
!strcmp(acl->function, function)) {
avl_delete(&acl_scope->acls, &acl->avl);
free(acl);
}
acl = next;
}
if (avl_is_empty(&acl_scope->acls)) {
avl_delete(&ses->acls, &acl_scope->avl);
free(acl_scope);
}
return 0;
}
static int
rpc_handle_acl(struct ubus_context *ctx, struct ubus_object *obj,
struct ubus_request_data *req, const char *method,
struct blob_attr *msg)
{
struct rpc_session *ses;
struct blob_attr *tb[__RPC_SA_MAX];
struct blob_attr *attr, *sattr;
const char *object, *function;
const char *scope = "ubus";
int rem1, rem2;
int (*cb)(struct rpc_session *ses,
const char *scope, const char *object, const char *function);
blobmsg_parse(acl_policy, __RPC_SA_MAX, tb, blob_data(msg), blob_len(msg));
if (!tb[RPC_SA_SID])
return UBUS_STATUS_INVALID_ARGUMENT;
ses = rpc_session_get(blobmsg_data(tb[RPC_SA_SID]));
if (!ses)
return UBUS_STATUS_NOT_FOUND;
if (tb[RPC_SA_SCOPE])
scope = blobmsg_data(tb[RPC_SA_SCOPE]);
if (!strcmp(method, "grant"))
cb = rpc_session_grant;
else
cb = rpc_session_revoke;
if (!tb[RPC_SA_OBJECTS])
return cb(ses, scope, NULL, NULL);
blobmsg_for_each_attr(attr, tb[RPC_SA_OBJECTS], rem1) {
if (blobmsg_type(attr) != BLOBMSG_TYPE_ARRAY)
continue;
object = NULL;
function = NULL;
blobmsg_for_each_attr(sattr, attr, rem2) {
if (blobmsg_type(sattr) != BLOBMSG_TYPE_STRING)
continue;
if (!object)
object = blobmsg_data(sattr);
else if (!function)
function = blobmsg_data(sattr);
else
break;
}
if (object && function)
cb(ses, scope, object, function);
}
return 0;
}
static bool
rpc_session_acl_allowed(struct rpc_session *ses, const char *scope,
const char *obj, const char *fun)
{
struct rpc_session_acl *acl;
struct rpc_session_acl_scope *acl_scope;
acl_scope = avl_find_element(&ses->acls, scope, acl_scope, avl);
if (acl_scope) {
uh_foreach_matching_acl(acl, &acl_scope->acls, obj, fun)
return true;
}
return false;
}
static int
rpc_handle_access(struct ubus_context *ctx, struct ubus_object *obj,
struct ubus_request_data *req, const char *method,
struct blob_attr *msg)
{
struct rpc_session *ses;
struct blob_attr *tb[__RPC_SP_MAX];
const char *scope = "ubus";
bool allow;
blobmsg_parse(perm_policy, __RPC_SP_MAX, tb, blob_data(msg), blob_len(msg));
if (!tb[RPC_SP_SID])
return UBUS_STATUS_INVALID_ARGUMENT;
ses = rpc_session_get(blobmsg_data(tb[RPC_SP_SID]));
if (!ses)
return UBUS_STATUS_NOT_FOUND;
blob_buf_init(&buf, 0);
if (tb[RPC_SP_OBJECT] && tb[RPC_SP_FUNCTION])
{
if (tb[RPC_SP_SCOPE])
scope = blobmsg_data(tb[RPC_SP_SCOPE]);
allow = rpc_session_acl_allowed(ses, scope,
blobmsg_data(tb[RPC_SP_OBJECT]),
blobmsg_data(tb[RPC_SP_FUNCTION]));
blobmsg_add_u8(&buf, "access", allow);
}
else
{
rpc_session_dump_acls(ses, &buf);
}
ubus_send_reply(ctx, req, buf.head);
return 0;
}
static void
rpc_session_set(struct rpc_session *ses, struct blob_attr *val)
{
struct rpc_session_data *data;
data = avl_find_element(&ses->data, blobmsg_name(val), data, avl);
if (data) {
avl_delete(&ses->data, &data->avl);
free(data);
}
data = calloc(1, sizeof(*data) + blob_pad_len(val));
if (!data)
return;
memcpy(data->attr, val, blob_pad_len(val));
data->avl.key = blobmsg_name(data->attr);
avl_insert(&ses->data, &data->avl);
}
static int
rpc_handle_set(struct ubus_context *ctx, struct ubus_object *obj,
struct ubus_request_data *req, const char *method,
struct blob_attr *msg)
{
struct rpc_session *ses;
struct blob_attr *tb[__RPC_SS_MAX];
struct blob_attr *attr;
int rem;
blobmsg_parse(set_policy, __RPC_SS_MAX, tb, blob_data(msg), blob_len(msg));
if (!tb[RPC_SS_SID] || !tb[RPC_SS_VALUES])
return UBUS_STATUS_INVALID_ARGUMENT;
ses = rpc_session_get(blobmsg_data(tb[RPC_SS_SID]));
if (!ses)
return UBUS_STATUS_NOT_FOUND;
blobmsg_for_each_attr(attr, tb[RPC_SS_VALUES], rem) {
if (!blobmsg_name(attr)[0])
continue;
rpc_session_set(ses, attr);
}
return 0;
}
static int
rpc_handle_get(struct ubus_context *ctx, struct ubus_object *obj,
struct ubus_request_data *req, const char *method,
struct blob_attr *msg)
{
struct rpc_session *ses;
struct rpc_session_data *data;
struct blob_attr *tb[__RPC_SG_MAX];
struct blob_attr *attr;
void *c;
int rem;
blobmsg_parse(get_policy, __RPC_SG_MAX, tb, blob_data(msg), blob_len(msg));
if (!tb[RPC_SG_SID])
return UBUS_STATUS_INVALID_ARGUMENT;
ses = rpc_session_get(blobmsg_data(tb[RPC_SG_SID]));
if (!ses)
return UBUS_STATUS_NOT_FOUND;
blob_buf_init(&buf, 0);
c = blobmsg_open_table(&buf, "values");
if (tb[RPC_SG_KEYS])
blobmsg_for_each_attr(attr, tb[RPC_SG_KEYS], rem) {
if (blobmsg_type(attr) != BLOBMSG_TYPE_STRING)
continue;
data = avl_find_element(&ses->data, blobmsg_data(attr), data, avl);
if (!data)
continue;
blobmsg_add_field(&buf, blobmsg_type(data->attr),
blobmsg_name(data->attr),
blobmsg_data(data->attr),
blobmsg_data_len(data->attr));
}
else
rpc_session_dump_data(ses, &buf);
blobmsg_close_table(&buf, c);
ubus_send_reply(ctx, req, buf.head);
return 0;
}
static int
rpc_handle_unset(struct ubus_context *ctx, struct ubus_object *obj,
struct ubus_request_data *req, const char *method,
struct blob_attr *msg)
{
struct rpc_session *ses;
struct rpc_session_data *data, *ndata;
struct blob_attr *tb[__RPC_SA_MAX];
struct blob_attr *attr;
int rem;
blobmsg_parse(get_policy, __RPC_SG_MAX, tb, blob_data(msg), blob_len(msg));
if (!tb[RPC_SG_SID])
return UBUS_STATUS_INVALID_ARGUMENT;
ses = rpc_session_get(blobmsg_data(tb[RPC_SG_SID]));
if (!ses)
return UBUS_STATUS_NOT_FOUND;
if (!tb[RPC_SG_KEYS]) {
avl_remove_all_elements(&ses->data, data, avl, ndata)
free(data);
return 0;
}
blobmsg_for_each_attr(attr, tb[RPC_SG_KEYS], rem) {
if (blobmsg_type(attr) != BLOBMSG_TYPE_STRING)
continue;
data = avl_find_element(&ses->data, blobmsg_data(attr), data, avl);
if (!data)
continue;
avl_delete(&ses->data, &data->avl);
free(data);
}
return 0;
}
static int
rpc_handle_destroy(struct ubus_context *ctx, struct ubus_object *obj,
struct ubus_request_data *req, const char *method,
struct blob_attr *msg)
{
struct rpc_session *ses;
struct blob_attr *tb;
blobmsg_parse(sid_policy, __RPC_SI_MAX, &tb, blob_data(msg), blob_len(msg));
if (!tb)
return UBUS_STATUS_INVALID_ARGUMENT;
if (!strcmp(blobmsg_get_string(tb), RPC_DEFAULT_SESSION_ID))
return UBUS_STATUS_PERMISSION_DENIED;
ses = rpc_session_get(blobmsg_data(tb));
if (!ses)
return UBUS_STATUS_NOT_FOUND;
rpc_session_destroy(ses);
return 0;
}
static bool
rpc_login_test_password(const char *hash, const char *password)
{
char *crypt_hash;
/* password is not set */
if (!hash || !*hash)
{
return true;
}
/* password hash refers to shadow/passwd */
else if (!strncmp(hash, "$p$", 3))
{
#ifdef HAVE_SHADOW
struct spwd *sp = getspnam(hash + 3);
if (!sp)
return false;
return rpc_login_test_password(sp->sp_pwdp, password);
#else
struct passwd *pw = getpwnam(hash + 3);
if (!pw)
return false;
return rpc_login_test_password(pw->pw_passwd, password);
#endif
}
crypt_hash = crypt(password, hash);
return (crypt_hash && !strcmp(crypt_hash, hash));
}
static struct uci_section *
rpc_login_test_login(struct uci_context *uci,
const char *username, const char *password)
{
struct uci_package *p = NULL;
struct uci_section *s;
struct uci_element *e;
struct uci_ptr ptr = { .package = "rpcd" };
if (!uci_lookup_ptr(uci, &ptr, NULL, false) && ptr.p) {
uci_unload(uci, ptr.p);
ptr.flags = 0;
ptr.p = NULL;
}
uci_load(uci, ptr.package, &p);
if (!p)
return false;
uci_foreach_element(&p->sections, e)
{
s = uci_to_section(e);
if (strcmp(s->type, "login"))
continue;
ptr.section = s->e.name;
ptr.s = NULL;
/* test for matching username */
ptr.option = "username";
ptr.o = NULL;
if (uci_lookup_ptr(uci, &ptr, NULL, true))
continue;
if (!ptr.o)
continue;
if (ptr.o->type != UCI_TYPE_STRING)
continue;
if (strcmp(ptr.o->v.string, username))
continue;
/* If password is NULL, we're restoring ACLs for an existing session,
* in this case do not check the password again. */
if (!password)
return ptr.s;
/* test for matching password */
ptr.option = "password";
ptr.o = NULL;
if (uci_lookup_ptr(uci, &ptr, NULL, true))
continue;
if (!ptr.o)
continue;
if (ptr.o->type != UCI_TYPE_STRING)
continue;
if (rpc_login_test_password(ptr.o->v.string, password))
return ptr.s;
}
return NULL;
}
static bool
rpc_login_test_permission(struct uci_section *s,
const char *perm, const char *group)
{
const char *p;
struct uci_option *o;
struct uci_element *e, *l;
/* If the login section is not provided, we're setting up acls for the
* default session, in this case uncondionally allow access to the
* "unauthenticated" access group */
if (!s) {
return !strcmp(group, "unauthenticated");
}
uci_foreach_element(&s->options, e)
{
o = uci_to_option(e);
if (o->type != UCI_TYPE_LIST)
continue;
if (strcmp(o->e.name, perm))
continue;
/* Match negative expressions first. If a negative expression matches
* the current group name then deny access. */
uci_foreach_element(&o->v.list, l) {
p = l->name;
if (!p || *p != '!')
continue;
while (isspace(*++p));
if (!*p)
continue;
if (!fnmatch(p, group, 0))
return false;
}
uci_foreach_element(&o->v.list, l) {
if (!l->name || !*l->name || *l->name == '!')
continue;
if (!fnmatch(l->name, group, 0))
return true;
}
}
/* make sure that write permission implies read permission */
if (!strcmp(perm, "read"))
return rpc_login_test_permission(s, "write", group);
return false;
}
static void
rpc_login_setup_acl_scope(struct rpc_session *ses,
struct blob_attr *acl_perm,
struct blob_attr *acl_scope)
{
struct blob_attr *acl_obj, *acl_func;
int rem, rem2;
/*
* Parse ACL scopes in table notation.
*
* "<scope>": {
* "<object>": [
* "<function>",
* "<function>",
* ...
* ]
* }
*/
if (blobmsg_type(acl_scope) == BLOBMSG_TYPE_TABLE) {
blobmsg_for_each_attr(acl_obj, acl_scope, rem) {
if (blobmsg_type(acl_obj) != BLOBMSG_TYPE_ARRAY)
continue;
blobmsg_for_each_attr(acl_func, acl_obj, rem2) {
if (blobmsg_type(acl_func) != BLOBMSG_TYPE_STRING)
continue;
rpc_session_grant(ses, blobmsg_name(acl_scope),
blobmsg_name(acl_obj),
blobmsg_data(acl_func));
}
}
}
/*
* Parse ACL scopes in array notation. The permission ("read" or "write")
* will be used as function name for each object.
*
* "<scope>": [
* "<object>",
* "<object>",
* ...
* ]