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- /*
- * rpcd - UBUS RPC server
- *
- * Copyright (C) 2013 Felix Fietkau <nbd@openwrt.org>
- * Copyright (C) 2013-2014 Jo-Philipp Wich <jow@openwrt.org>
- *
- * 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>",
- * ...
- * ]
- */
- else if (blobmsg_type(acl_scope) == BLOBMSG_TYPE_ARRAY) {
- blobmsg_for_each_attr(acl_obj, acl_scope, rem) {
- if (blobmsg_type(acl_obj) != BLOBMSG_TYPE_STRING)
- continue;
- rpc_session_grant(ses, blobmsg_name(acl_scope),
- blobmsg_data(acl_obj),
- blobmsg_name(acl_perm));
- }
- }
- }
- static void
- rpc_login_setup_acl_file(struct rpc_session *ses, struct uci_section *login,
- const char *path)
- {
- struct blob_buf acl = { 0 };
- struct blob_attr *acl_group, *acl_perm, *acl_scope;
- int rem, rem2, rem3;
- blob_buf_init(&acl, 0);
- if (!blobmsg_add_json_from_file(&acl, path)) {
- fprintf(stderr, "Failed to parse %s\n", path);
- goto out;
- }
- /* Iterate access groups in toplevel object */
- blob_for_each_attr(acl_group, acl.head, rem) {
- /* Iterate permission objects in each access group object */
- blobmsg_for_each_attr(acl_perm, acl_group, rem2) {
- if (blobmsg_type(acl_perm) != BLOBMSG_TYPE_TABLE)
- continue;
- /* Only "read" and "write" permissions are defined */
- if (strcmp(blobmsg_name(acl_perm), "read") &&
- strcmp(blobmsg_name(acl_perm), "write"))
- continue;
- /*
- * Check if the current user context specifies the current
- * "read" or "write" permission in the given access group.
- */
- if (!rpc_login_test_permission(login, blobmsg_name(acl_perm),
- blobmsg_name(acl_group)))
- continue;
- /* Iterate scope objects within the permission object */
- blobmsg_for_each_attr(acl_scope, acl_perm, rem3) {
- /* Setup the scopes of the access group */
- rpc_login_setup_acl_scope(ses, acl_perm, acl_scope);
- /*
- * Add the access group itself as object to the "access-group"
- * meta scope and the the permission level ("read" or "write")
- * as function, so
- * "<group>": {
- * "<permission>": {
- * "<scope>": ...
- * }
- * }
- * becomes
- * "access-group": {
- * "<group>": [
- * "<permission>"
- * ]
- * }
- *
- * This allows session clients to easily query the allowed
- * access groups without having to test access of each single
- * <scope>/<object>/<function> tuple defined in a group.
- */
- rpc_session_grant(ses, "access-group",
- blobmsg_name(acl_group),
- blobmsg_name(acl_perm));
- }
- }
- }
- out:
- blob_buf_free(&acl);
- }
- static void
- rpc_login_setup_acls(struct rpc_session *ses, struct uci_section *login)
- {
- int i;
- glob_t gl;
- if (glob(RPC_SESSION_ACL_DIR "/*.json", 0, NULL, &gl))
- return;
- for (i = 0; i < gl.gl_pathc; i++)
- rpc_login_setup_acl_file(ses, login, gl.gl_pathv[i]);
- globfree(&gl);
- }
- static struct rpc_session *
- rpc_reclaim_apply_session(const char *expected_username)
- {
- struct rpc_session_data *username;
- struct rpc_session *ses;
- if (!apply_sid[0])
- return NULL;
- ses = rpc_session_get(apply_sid);
- if (!ses)
- return NULL;
- username = avl_find_element(&ses->data, "username", username, avl);
- if (!username || blobmsg_type(username->attr) != BLOBMSG_TYPE_STRING)
- return NULL;
- if (strcmp(blobmsg_get_string(username->attr), expected_username))
- return NULL;
- return ses;
- }
- static int
- rpc_handle_login(struct ubus_context *ctx, struct ubus_object *obj,
- struct ubus_request_data *req, const char *method,
- struct blob_attr *msg)
- {
- struct uci_context *uci = NULL;
- struct uci_section *login;
- struct rpc_session *ses;
- struct blob_attr *tb[__RPC_L_MAX];
- int timeout = RPC_DEFAULT_SESSION_TIMEOUT;
- int rv = 0;
- blobmsg_parse(login_policy, __RPC_L_MAX, tb, blob_data(msg), blob_len(msg));
- if (!tb[RPC_L_USERNAME] || !tb[RPC_L_PASSWORD]) {
- rv = UBUS_STATUS_INVALID_ARGUMENT;
- goto out;
- }
- uci = uci_alloc_context();
- if (!uci) {
- rv = UBUS_STATUS_UNKNOWN_ERROR;
- goto out;
- }
- login = rpc_login_test_login(uci, blobmsg_get_string(tb[RPC_L_USERNAME]),
- blobmsg_get_string(tb[RPC_L_PASSWORD]));
- if (!login) {
- rv = UBUS_STATUS_PERMISSION_DENIED;
- goto out;
- }
- if (tb[RPC_L_TIMEOUT])
- timeout = blobmsg_get_u32(tb[RPC_L_TIMEOUT]);
- /*
- * attempt to reclaim a pending apply session, but only accept it
- * if the username matches, otherwise perform a new login
- */
- ses = rpc_reclaim_apply_session(blobmsg_get_string(tb[RPC_L_USERNAME]));
- if (!ses)
- ses = rpc_session_create(timeout);
- if (!ses) {
- rv = UBUS_STATUS_UNKNOWN_ERROR;
- goto out;
- }
- rpc_login_setup_acls(ses, login);
- rpc_session_set(ses, tb[RPC_L_USERNAME]);
- rpc_session_dump(ses, ctx, req);
- out:
- if (uci)
- uci_free_context(uci);
- return rv;
- }
- static bool
- rpc_validate_sid(const char *id)
- {
- if (!id)
- return false;
- if (strlen(id) != RPC_SID_LEN)
- return false;
- while (*id)
- if (!isxdigit(*id++))
- return false;
- return true;
- }
- static int
- rpc_blob_to_file(const char *path, struct blob_attr *attr)
- {
- int fd, len;
- fd = open(path, O_WRONLY | O_CREAT | O_EXCL, 0600);
- if (fd < 0)
- return fd;
- len = write(fd, attr, blob_pad_len(attr));
- close(fd);
- if (len != blob_pad_len(attr))
- {
- unlink(path);
- return -1;
- }
- return len;
- }
- static struct blob_attr *
- rpc_blob_from_file(const char *path)
- {
- int fd = -1, len;
- struct stat s;
- struct blob_attr head, *attr = NULL;
- if (stat(path, &s) || !S_ISREG(s.st_mode))
- return NULL;
- fd = open(path, O_RDONLY);
- if (fd < 0)
- goto fail;
- len = read(fd, &head, sizeof(head));
- if (len != sizeof(head) || blob_pad_len(&head) != s.st_size)
- goto fail;
- attr = calloc(1, s.st_size);
- if (!attr)
- goto fail;
- memcpy(attr, &head, sizeof(head));
- len += read(fd, (char *)attr + sizeof(head), s.st_size - sizeof(head));
- if (len != blob_pad_len(&head))
- goto fail;
- close(fd);
- return attr;
- fail:
- if (fd >= 0)
- close(fd);
- if (attr)
- free(attr);
- return NULL;
- }
- static bool
- rpc_session_from_blob(struct uci_context *uci, struct blob_attr *attr)
- {
- int i, rem;
- const char *user = NULL;
- struct rpc_session *ses;
- struct uci_section *login;
- struct blob_attr *tb[__RPC_DUMP_MAX], *data;
- blobmsg_parse(dump_policy, __RPC_DUMP_MAX, tb,
- blob_data(attr), blob_len(attr));
- for (i = 0; i < __RPC_DUMP_MAX; i++)
- if (!tb[i])
- return false;
- ses = rpc_session_new();
- if (!ses)
- return false;
- memcpy(ses->id, blobmsg_data(tb[RPC_DUMP_SID]), RPC_SID_LEN);
- ses->timeout = blobmsg_get_u32(tb[RPC_DUMP_TIMEOUT]);
- blobmsg_for_each_attr(data, tb[RPC_DUMP_DATA], rem) {
- rpc_session_set(ses, data);
- if (blobmsg_type(data) != BLOBMSG_TYPE_STRING)
- continue;
- if (!strcmp(blobmsg_name(data), "username"))
- user = blobmsg_get_string(data);
- }
- if (uci && user) {
- login = rpc_login_test_login(uci, user, NULL);
- if (login)
- rpc_login_setup_acls(ses, login);
- }
- avl_insert(&sessions, &ses->avl);
- uloop_timeout_set(&ses->t, blobmsg_get_u64(tb[RPC_DUMP_EXPIRES]) * 1000);
- return true;
- }
- int rpc_session_api_init(struct ubus_context *ctx)
- {
- struct rpc_session *ses;
- static const struct ubus_method session_methods[] = {
- UBUS_METHOD("create", rpc_handle_create, new_policy),
- UBUS_METHOD("list", rpc_handle_list, sid_policy),
- UBUS_METHOD("grant", rpc_handle_acl, acl_policy),
- UBUS_METHOD("revoke", rpc_handle_acl, acl_policy),
- UBUS_METHOD("access", rpc_handle_access, perm_policy),
- UBUS_METHOD("set", rpc_handle_set, set_policy),
- UBUS_METHOD("get", rpc_handle_get, get_policy),
- UBUS_METHOD("unset", rpc_handle_unset, get_policy),
- UBUS_METHOD("destroy", rpc_handle_destroy, sid_policy),
- UBUS_METHOD("login", rpc_handle_login, login_policy),
- };
- static struct ubus_object_type session_type =
- UBUS_OBJECT_TYPE("rpcd-plugin-session", session_methods);
- static struct ubus_object obj = {
- .name = "session",
- .type = &session_type,
- .methods = session_methods,
- .n_methods = ARRAY_SIZE(session_methods),
- };
- avl_init(&sessions, avl_strcmp, false, NULL);
- /* setup the default session */
- ses = rpc_session_new();
- if (ses) {
- strcpy(ses->id, RPC_DEFAULT_SESSION_ID);
- rpc_login_setup_acls(ses, NULL);
- avl_insert(&sessions, &ses->avl);
- }
- return ubus_add_object(ctx, &obj);
- }
- bool rpc_session_access(const char *sid, const char *scope,
- const char *object, const char *function)
- {
- struct rpc_session *ses = rpc_session_get(sid);
- if (!ses)
- return false;
- return rpc_session_acl_allowed(ses, scope, object, function);
- }
- void rpc_session_create_cb(struct rpc_session_cb *cb)
- {
- if (cb && cb->cb)
- list_add(&cb->list, &create_callbacks);
- }
- void rpc_session_destroy_cb(struct rpc_session_cb *cb)
- {
- if (cb && cb->cb)
- list_add(&cb->list, &destroy_callbacks);
- }
- void rpc_session_freeze(void)
- {
- struct stat s;
- struct rpc_session *ses;
- char path[PATH_MAX];
- if (stat(RPC_SESSION_DIRECTORY, &s))
- mkdir(RPC_SESSION_DIRECTORY, 0700);
- avl_for_each_element(&sessions, ses, avl) {
- /* skip default session */
- if (!strcmp(ses->id, RPC_DEFAULT_SESSION_ID))
- continue;
- snprintf(path, sizeof(path) - 1, RPC_SESSION_DIRECTORY "/%s", ses->id);
- rpc_session_to_blob(ses, false);
- rpc_blob_to_file(path, buf.head);
- }
- }
- void rpc_session_thaw(void)
- {
- DIR *d;
- char path[PATH_MAX];
- struct dirent *e;
- struct blob_attr *attr;
- struct uci_context *uci;
- d = opendir(RPC_SESSION_DIRECTORY);
- if (!d)
- return;
- uci = uci_alloc_context();
- if (!uci)
- return;
- while ((e = readdir(d)) != NULL) {
- if (!rpc_validate_sid(e->d_name))
- continue;
- snprintf(path, sizeof(path) - 1,
- RPC_SESSION_DIRECTORY "/%s", e->d_name);
- attr = rpc_blob_from_file(path);
- if (attr) {
- rpc_session_from_blob(uci, attr);
- free(attr);
- }
- unlink(path);
- }
- closedir(d);
- uci_free_context(uci);
- }
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