X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=src%2Fbus-proxyd%2Fbus-proxyd.c;h=32c82422211f4fd6493a4969833103ec9e71e71a;hp=d35d7f63b2f54a49274617939e9c1cc756cb4d1b;hb=705a415f684f8e9ee19983e5859de00bbb1477cb;hpb=af4ec4309e8f82aad87a8d574785c12f8763d5f8 diff --git a/src/bus-proxyd/bus-proxyd.c b/src/bus-proxyd/bus-proxyd.c index d35d7f63b..32c824222 100644 --- a/src/bus-proxyd/bus-proxyd.c +++ b/src/bus-proxyd/bus-proxyd.c @@ -40,7 +40,6 @@ #include "bus-internal.h" #include "bus-message.h" #include "bus-util.h" -#include "bus-internal.h" #include "build.h" #include "strv.h" #include "def.h" @@ -52,6 +51,8 @@ static char *arg_command_line_buffer = NULL; static bool arg_drop_privileges = false; static char **arg_configuration = NULL; +static Hashmap *names_hash = NULL; + static int help(void) { printf("%s [OPTIONS...]\n\n" @@ -187,7 +188,7 @@ static int rename_service(sd_bus *a, sd_bus *b) { assert(a); assert(b); - r = sd_bus_get_peer_creds(b, SD_BUS_CREDS_UID|SD_BUS_CREDS_PID|SD_BUS_CREDS_CMDLINE|SD_BUS_CREDS_COMM, &creds); + r = sd_bus_get_owner_creds(b, SD_BUS_CREDS_UID|SD_BUS_CREDS_PID|SD_BUS_CREDS_CMDLINE|SD_BUS_CREDS_COMM, &creds); if (r < 0) return r; @@ -310,48 +311,6 @@ static int synthesize_name_acquired(sd_bus *a, sd_bus *b, sd_bus_message *m) { return sd_bus_send(b, n, NULL); } -static int process_policy(sd_bus *a, sd_bus *b, sd_bus_message *m) { - _cleanup_bus_message_unref_ sd_bus_message *n = NULL; - int r; - - assert(a); - assert(b); - assert(m); - - if (!a->is_kernel) - return 0; - - if (!sd_bus_message_is_method_call(m, "org.freedesktop.DBus.Properties", "GetAll")) - return 0; - - if (!streq_ptr(m->path, "/org/gnome/DisplayManager/Slave")) - return 0; - - r = sd_bus_message_new_method_errorf(m, &n, SD_BUS_ERROR_ACCESS_DENIED, "gdm, you are stupid"); - if (r < 0) - return r; - - r = bus_message_append_sender(n, "org.freedesktop.DBus"); - if (r < 0) { - log_error("Failed to append sender to gdm reply: %s", strerror(-r)); - return r; - } - - r = bus_seal_synthetic_message(b, n); - if (r < 0) { - log_error("Failed to seal gdm reply: %s", strerror(-r)); - return r; - } - - r = sd_bus_send(b, n, NULL); - if (r < 0) { - log_error("Failed to send gdm reply: %s", strerror(-r)); - return r; - } - - return 1; -} - static int synthetic_driver_send(sd_bus *b, sd_bus_message *m) { int r; @@ -373,6 +332,8 @@ static int synthetic_reply_method_error(sd_bus_message *call, const sd_bus_error _cleanup_bus_message_unref_ sd_bus_message *m = NULL; int r; + assert(call); + if (call->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED) return 0; @@ -387,6 +348,8 @@ static int synthetic_reply_method_errno(sd_bus_message *call, int error, const s _cleanup_bus_error_free_ sd_bus_error berror = SD_BUS_ERROR_NULL; + assert(call); + if (call->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED) return 0; @@ -402,6 +365,8 @@ static int synthetic_reply_method_return(sd_bus_message *call, const char *types _cleanup_bus_message_unref_ sd_bus_message *m = NULL; int r; + assert(call); + if (call->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED) return 0; @@ -426,6 +391,8 @@ static int synthetic_reply_return_strv(sd_bus_message *call, char **l) { _cleanup_bus_message_unref_ sd_bus_message *m = NULL; int r; + assert(call); + r = sd_bus_message_new_method_return(call, &m); if (r < 0) return synthetic_reply_method_errno(call, r, NULL); @@ -445,9 +412,7 @@ static int get_creds_by_name(sd_bus *bus, const char *name, uint64_t mask, sd_bu assert(name); assert(_creds); - assert_return(service_name_is_valid(name), -EINVAL); - - r = sd_bus_get_owner(bus, name, mask, &c); + r = sd_bus_get_name_creds(bus, name, mask, &c); if (r == -ESRCH || r == -ENXIO) return sd_bus_error_setf(error, SD_BUS_ERROR_NAME_HAS_NO_OWNER, "Name %s is currently not owned by anyone.", name); if (r < 0) @@ -477,30 +442,95 @@ static int get_creds_by_message(sd_bus *bus, sd_bus_message *m, uint64_t mask, s return get_creds_by_name(bus, name, mask, _creds, error); } -static int peer_is_privileged(sd_bus *bus, sd_bus_message *m) { - _cleanup_bus_creds_unref_ sd_bus_creds *creds = NULL; - uid_t uid; +static int process_policy(sd_bus *a, sd_bus *b, sd_bus_message *m, Policy *policy, const struct ucred *ucred) { int r; + char **name; + char **names_strv; + bool granted = false; + Iterator i; - r = get_creds_by_message(bus, m, SD_BUS_CREDS_UID, &creds, NULL); - if (r < 0) - return r; + assert(a); + assert(b); + assert(m); - r = sd_bus_creds_get_uid(creds, &uid); - if (r < 0) - return r; + if (!policy) + return 0; + + if (b->is_kernel) { + + /* The message came from the kernel, and is sent to our legacy client. */ + r = sd_bus_creds_get_well_known_names(&m->creds, &names_strv); + if (r < 0) + return r; + + STRV_FOREACH(name, names_strv) { + if (policy_check_send(policy, ucred, m->header->type, *name, m->path, m->interface, m->member)) { + r = free_and_strdup(&m->destination_ptr, *name); + if (r < 0) + break; + + granted = true; + break; + } + } + + if (r < 0) + return r; + + if (!granted) + return -EPERM; + + granted = false; + + HASHMAP_FOREACH(name, names_hash, i) { + if (policy_check_recv(policy, ucred, m->header->type, *name, m->path, m->interface, m->member)) + return 0; + } - r = sd_bus_creds_has_effective_cap(creds, CAP_SYS_ADMIN); - if (r > 0) - return true; + return -EPERM; + } else { + sd_bus_creds *bus_creds; + + /* The message came from the legacy client, and is sent to kdbus. */ + r = sd_bus_get_name_creds(a, m->destination, SD_BUS_CREDS_WELL_KNOWN_NAMES, &bus_creds); + if (r < 0) + return r; - if (uid == getuid()) - return true; + STRV_FOREACH(name, names_strv) { + if (policy_check_send(policy, ucred, m->header->type, *name, m->path, m->interface, m->member)) { + r = free_and_strdup(&m->destination_ptr, *name); + if (r < 0) + break; - return false; + r = bus_kernel_parse_unique_name(m->sender, &m->verify_destination_id); + if (r < 0) + break; + + granted = true; + break; + } + } + + if (r < 0) + return r; + + if (!granted) + return -EPERM; + + granted = false; + + HASHMAP_FOREACH(name, names_hash, i) { + if (policy_check_recv(policy, ucred, m->header->type, *name, m->path, m->interface, m->member)) + return 0; + } + + return -EPERM; + } + + return 0; } -static int process_driver(sd_bus *a, sd_bus *b, sd_bus_message *m) { +static int process_driver(sd_bus *a, sd_bus *b, sd_bus_message *m, Policy *policy, const struct ucred *ucred) { int r; assert(a); @@ -637,28 +667,31 @@ static int process_driver(sd_bus *a, sd_bus *b, sd_bus_message *m) { } else if (sd_bus_message_is_method_call(m, "org.freedesktop.DBus", "GetConnectionSELinuxSecurityContext")) { _cleanup_bus_creds_unref_ sd_bus_creds *creds = NULL; + _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL; - r = get_creds_by_message(a, m, SD_BUS_CREDS_SELINUX_CONTEXT, &creds, NULL); + r = get_creds_by_message(a, m, SD_BUS_CREDS_SELINUX_CONTEXT, &creds, &error); if (r < 0) - return synthetic_reply_method_errno(m, r, NULL); + return synthetic_reply_method_errno(m, r, &error); return synthetic_reply_method_return(m, "y", creds->label, strlen(creds->label)); } else if (sd_bus_message_is_method_call(m, "org.freedesktop.DBus", "GetConnectionUnixProcessID")) { _cleanup_bus_creds_unref_ sd_bus_creds *creds = NULL; + _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL; - r = get_creds_by_message(a, m, SD_BUS_CREDS_PID, &creds, NULL); + r = get_creds_by_message(a, m, SD_BUS_CREDS_PID, &creds, &error); if (r < 0) - return synthetic_reply_method_errno(m, r, NULL); + return synthetic_reply_method_errno(m, r, &error); return synthetic_reply_method_return(m, "u", (uint32_t) creds->pid); } else if (sd_bus_message_is_method_call(m, "org.freedesktop.DBus", "GetConnectionUnixUser")) { _cleanup_bus_creds_unref_ sd_bus_creds *creds = NULL; + _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL; - r = get_creds_by_message(a, m, SD_BUS_CREDS_UID, &creds, NULL); + r = get_creds_by_message(a, m, SD_BUS_CREDS_UID, &creds, &error); if (r < 0) - return synthetic_reply_method_errno(m, r, NULL); + return synthetic_reply_method_errno(m, r, &error); return synthetic_reply_method_return(m, "u", (uint32_t) creds->uid); @@ -666,7 +699,7 @@ static int process_driver(sd_bus *a, sd_bus *b, sd_bus_message *m) { sd_id128_t server_id; char buf[SD_ID128_STRING_MAX]; - r = sd_bus_get_server_id(a, &server_id); + r = sd_bus_get_owner_id(a, &server_id); if (r < 0) return synthetic_reply_method_errno(m, r, NULL); @@ -723,8 +756,10 @@ static int process_driver(sd_bus *a, sd_bus *b, sd_bus_message *m) { } else if (sd_bus_message_is_method_call(m, "org.freedesktop.DBus", "ListQueuedOwners")) { struct kdbus_cmd_name_list cmd = {}; struct kdbus_name_list *name_list; - struct kdbus_cmd_name *name; + struct kdbus_cmd_free cmd_free; + struct kdbus_name_info *name; _cleanup_strv_free_ char **owners = NULL; + _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL; char *arg0; int err = 0; @@ -732,8 +767,13 @@ static int process_driver(sd_bus *a, sd_bus *b, sd_bus_message *m) { if (r < 0) return synthetic_reply_method_errno(m, r, NULL); - if (!service_name_is_valid(arg0)) - return synthetic_reply_method_errno(m, -EINVAL, NULL); + r = sd_bus_get_name_creds(a, arg0, 0, NULL); + if (r == -ESRCH || r == -ENXIO) { + sd_bus_error_setf(&error, SD_BUS_ERROR_NAME_HAS_NO_OWNER, "Could not get owners of name '%s': no such name.", arg0); + return synthetic_reply_method_errno(m, r, &error); + } + if (r < 0) + return synthetic_reply_method_errno(m, r, NULL); cmd.flags = KDBUS_NAME_LIST_QUEUED; r = ioctl(a->input_fd, KDBUS_CMD_NAME_LIST, &cmd); @@ -743,12 +783,15 @@ static int process_driver(sd_bus *a, sd_bus *b, sd_bus_message *m) { name_list = (struct kdbus_name_list *) ((uint8_t *) a->kdbus_buffer + cmd.offset); KDBUS_ITEM_FOREACH(name, name_list, names) { + const char *entry_name = NULL; + struct kdbus_item *item; char *n; - if (name->size <= sizeof(*name)) - continue; + KDBUS_ITEM_FOREACH(item, name, items) + if (item->type == KDBUS_ITEM_OWNED_NAME) + entry_name = item->name.name; - if (!streq(name->name, arg0)) + if (!streq_ptr(entry_name, arg0)) continue; if (asprintf(&n, ":1.%llu", (unsigned long long) name->owner_id) < 0) { @@ -763,7 +806,10 @@ static int process_driver(sd_bus *a, sd_bus *b, sd_bus_message *m) { } } - r = ioctl(a->input_fd, KDBUS_CMD_FREE, &cmd.offset); + cmd_free.flags = 0; + cmd_free.offset = cmd.offset; + + r = ioctl(a->input_fd, KDBUS_CMD_FREE, &cmd_free); if (r < 0) return synthetic_reply_method_errno(m, r, NULL); @@ -779,13 +825,10 @@ static int process_driver(sd_bus *a, sd_bus *b, sd_bus_message *m) { if (r < 0) return synthetic_reply_method_errno(m, r, NULL); - if (!service_name_is_valid(name)) - return synthetic_reply_method_errno(m, -EINVAL, NULL); - if (streq(name, "org.freedesktop.DBus")) return synthetic_reply_method_return(m, "b", true); - r = sd_bus_get_owner(a, name, 0, NULL); + r = sd_bus_get_name_creds(a, name, 0, NULL); if (r < 0 && r != -ESRCH && r != -ENXIO) return synthetic_reply_method_errno(m, r, NULL); @@ -798,9 +841,6 @@ static int process_driver(sd_bus *a, sd_bus *b, sd_bus_message *m) { if (r < 0) return synthetic_reply_method_errno(m, r, NULL); - if (!service_name_is_valid(name)) - return synthetic_reply_method_errno(m, -EINVAL, NULL); - r = sd_bus_release_name(a, name); if (r < 0) { if (r == -ESRCH) @@ -811,6 +851,8 @@ static int process_driver(sd_bus *a, sd_bus *b, sd_bus_message *m) { return synthetic_reply_method_errno(m, r, NULL); } + hashmap_remove(names_hash, name); + return synthetic_reply_method_return(m, "u", BUS_NAME_RELEASED); } else if (sd_bus_message_is_method_call(m, "org.freedesktop.DBus", "ReloadConfig")) { @@ -822,18 +864,28 @@ static int process_driver(sd_bus *a, sd_bus *b, sd_bus_message *m) { } else if (sd_bus_message_is_method_call(m, "org.freedesktop.DBus", "RequestName")) { const char *name; - uint32_t flags; + uint32_t flags, param; + bool in_queue; r = sd_bus_message_read(m, "su", &name, &flags); if (r < 0) return synthetic_reply_method_errno(m, r, NULL); - if (!service_name_is_valid(name)) - return synthetic_reply_method_errno(m, -EINVAL, NULL); + if (policy && !policy_check_own(policy, ucred, name)) + return synthetic_reply_method_errno(m, -EPERM, NULL); + if ((flags & ~(BUS_NAME_ALLOW_REPLACEMENT|BUS_NAME_REPLACE_EXISTING|BUS_NAME_DO_NOT_QUEUE)) != 0) return synthetic_reply_method_errno(m, -EINVAL, NULL); - r = sd_bus_request_name(a, name, flags); + param = 0; + if (flags & BUS_NAME_ALLOW_REPLACEMENT) + param |= SD_BUS_NAME_ALLOW_REPLACEMENT; + if (flags & BUS_NAME_REPLACE_EXISTING) + param |= SD_BUS_NAME_REPLACE_EXISTING; + if (!(flags & BUS_NAME_DO_NOT_QUEUE)) + param |= SD_BUS_NAME_QUEUE; + + r = sd_bus_request_name(a, name, param); if (r < 0) { if (r == -EEXIST) return synthetic_reply_method_return(m, "u", BUS_NAME_EXISTS); @@ -842,7 +894,13 @@ static int process_driver(sd_bus *a, sd_bus *b, sd_bus_message *m) { return synthetic_reply_method_errno(m, r, NULL); } - if (r == 0) + in_queue = (r == 0); + + r = hashmap_put(names_hash, name, NULL); + if (r < 0) + return synthetic_reply_method_errno(m, r, NULL); + + if (in_queue) return synthetic_reply_method_return(m, "u", BUS_NAME_IN_QUEUE); return synthetic_reply_method_return(m, "u", BUS_NAME_PRIMARY_OWNER); @@ -856,12 +914,10 @@ static int process_driver(sd_bus *a, sd_bus *b, sd_bus_message *m) { if (r < 0) return synthetic_reply_method_errno(m, r, NULL); - if (!service_name_is_valid(name)) - return synthetic_reply_method_errno(m, -EINVAL, NULL); if (flags != 0) return synthetic_reply_method_errno(m, -EINVAL, NULL); - r = sd_bus_get_owner(a, name, 0, NULL); + r = sd_bus_get_name_creds(a, name, 0, NULL); if (r >= 0 || streq(name, "org.freedesktop.DBus")) return synthetic_reply_method_return(m, "u", BUS_START_REPLY_ALREADY_RUNNING); if (r != -ESRCH) @@ -887,9 +943,6 @@ static int process_driver(sd_bus *a, sd_bus *b, sd_bus_message *m) { _cleanup_bus_message_unref_ sd_bus_message *msg = NULL; _cleanup_strv_free_ char **args = NULL; - if (!peer_is_privileged(a, m)) - return synthetic_reply_method_errno(m, -EPERM, NULL); - r = sd_bus_message_enter_container(m, SD_BUS_TYPE_ARRAY, "{ss}"); if (r < 0) return synthetic_reply_method_errno(m, r, NULL); @@ -952,7 +1005,7 @@ static int process_driver(sd_bus *a, sd_bus *b, sd_bus_message *m) { } } -static int process_hello(sd_bus *a, sd_bus *b, sd_bus_message *m, bool *got_hello) { +static int process_hello(sd_bus *a, sd_bus *b, sd_bus_message *m, Policy *policy, const struct ucred *ucred, bool *got_hello) { _cleanup_bus_message_unref_ sd_bus_message *n = NULL; bool is_hello; int r; @@ -984,6 +1037,11 @@ static int process_hello(sd_bus *a, sd_bus *b, sd_bus_message *m, bool *got_hell return -EIO; } + if (policy && !policy_check_hello(policy, ucred)) { + log_error("Policy denied HELLO"); + return -EPERM; + } + *got_hello = true; if (!a->is_kernel) @@ -1090,6 +1148,7 @@ static int patch_sender(sd_bus *a, sd_bus_message *m) { int main(int argc, char *argv[]) { + _cleanup_bus_creds_unref_ sd_bus_creds *bus_creds = NULL; _cleanup_bus_close_unref_ sd_bus *a = NULL, *b = NULL; sd_id128_t server_id; int r, in_fd, out_fd; @@ -1132,8 +1191,8 @@ int main(int argc, char *argv[]) { sd_is_socket(out_fd, AF_UNIX, 0, 0) > 0; if (is_unix) { - getpeercred(in_fd, &ucred); - getpeersec(in_fd, &peersec); + (void) getpeercred(in_fd, &ucred); + (void) getpeersec(in_fd, &peersec); } if (arg_drop_privileges) { @@ -1152,13 +1211,19 @@ int main(int argc, char *argv[]) { goto finish; } + names_hash = hashmap_new(&string_hash_ops); + if (!names_hash) { + log_oom(); + goto finish; + } + r = sd_bus_new(&a); if (r < 0) { log_error("Failed to allocate bus: %s", strerror(-r)); goto finish; } - r = sd_bus_set_name(a, "sd-proxy"); + r = sd_bus_set_description(a, "sd-proxy"); if (r < 0) { log_error("Failed to set bus name: %s", strerror(-r)); goto finish; @@ -1177,9 +1242,17 @@ int main(int argc, char *argv[]) { } if (ucred.pid > 0) { - a->fake_creds.pid = ucred.pid; + a->fake_pids.pid = ucred.pid; + a->fake_pids_valid = true; + a->fake_creds.uid = ucred.uid; + a->fake_creds.euid = (uid_t) -1; + a->fake_creds.suid = (uid_t) -1; + a->fake_creds.fsuid = (uid_t) -1; a->fake_creds.gid = ucred.gid; + a->fake_creds.egid = (gid_t) -1; + a->fake_creds.sgid = (gid_t) -1; + a->fake_creds.fsgid = (gid_t) -1; a->fake_creds_valid = true; } @@ -1196,12 +1269,18 @@ int main(int argc, char *argv[]) { goto finish; } - r = sd_bus_get_server_id(a, &server_id); + r = sd_bus_get_owner_id(a, &server_id); if (r < 0) { log_error("Failed to get server ID: %s", strerror(-r)); goto finish; } + r = sd_bus_get_owner_creds(a, SD_BUS_CREDS_UID, &bus_creds); + if (r < 0) { + log_error("Failed to get bus creds: %s", strerror(-r)); + goto finish; + } + r = sd_bus_new(&b); if (r < 0) { log_error("Failed to allocate bus: %s", strerror(-r)); @@ -1361,13 +1440,23 @@ int main(int argc, char *argv[]) { } if (m) { + Policy *p = NULL; + uid_t uid; + + assert_se(sd_bus_creds_get_uid(bus_creds, &uid) == 0); + +/* + if (uid == 0 || uid != ucred.uid) + p = &policy; +*/ + /* We officially got EOF, let's quit */ if (sd_bus_message_is_signal(m, "org.freedesktop.DBus.Local", "Disconnected")) { r = 0; goto finish; } - k = process_hello(a, b, m, &got_hello); + k = process_hello(a, b, m, p, &ucred, &got_hello); if (k < 0) { r = k; log_error("Failed to process HELLO: %s", strerror(-r)); @@ -1377,14 +1466,7 @@ int main(int argc, char *argv[]) { if (k > 0) r = k; else { - k = process_policy(a, b, m); - if (k < 0) { - r = k; - log_error("Failed to process policy: %s", strerror(-r)); - goto finish; - } - - k = process_driver(a, b, m); + k = process_driver(a, b, m, p, &ucred); if (k < 0) { r = k; log_error("Failed to process driver calls: %s", strerror(-r)); @@ -1394,17 +1476,33 @@ int main(int argc, char *argv[]) { if (k > 0) r = k; else { - k = sd_bus_send(a, m, NULL); - if (k < 0) { - if (k == -ECONNRESET) - r = 0; - else { + bool retry; + + do { + retry = false; + + k = process_policy(a, b, m, p, &ucred); + if (k < 0) { r = k; - log_error("Failed to send message: %s", strerror(-r)); + log_error("Failed to process policy: %s", strerror(-r)); + goto finish; } - goto finish; - } + k = sd_bus_send(a, m, NULL); + if (k < 0) { + if (k == -ECONNRESET) + r = 0; + else if (k == -EREMCHG) + retry = true; + else { + r = k; + log_error("Failed to send message: %s", strerror(-r)); + } + + if (!retry) + goto finish; + } + } while (retry); } } } @@ -1480,6 +1578,7 @@ finish: policy_free(&policy); strv_free(arg_configuration); + hashmap_free(names_hash); free(arg_address); return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;