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=a6554aba3b8da00ab2fb70c02f595106b573ac8e;hb=705a415f684f8e9ee19983e5859de00bbb1477cb;hpb=8573b68fecc65a0cd285e4c5e288831856948e62 diff --git a/src/bus-proxyd/bus-proxyd.c b/src/bus-proxyd/bus-proxyd.c index a6554aba3..32c824222 100644 --- a/src/bus-proxyd/bus-proxyd.c +++ b/src/bus-proxyd/bus-proxyd.c @@ -311,48 +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; @@ -454,8 +412,6 @@ 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_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); @@ -486,30 +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; - r = sd_bus_creds_has_effective_cap(creds, CAP_SYS_ADMIN); - if (r > 0) - 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; - if (uid == getuid()) - return true; + granted = true; + break; + } + } + + if (r < 0) + return r; - return false; + 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; + } 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; + + 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; + + 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); @@ -746,9 +767,6 @@ 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(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); @@ -807,9 +825,6 @@ 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); - if (streq(name, "org.freedesktop.DBus")) return synthetic_reply_method_return(m, "b", true); @@ -826,9 +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) @@ -859,8 +871,9 @@ 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 (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); @@ -901,8 +914,6 @@ 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); if (flags != 0) return synthetic_reply_method_errno(m, -EINVAL, NULL); @@ -932,9 +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); @@ -1029,7 +1037,7 @@ static int process_hello(sd_bus *a, sd_bus *b, sd_bus_message *m, Policy *policy return -EIO; } - if (!policy_check_hello(policy, ucred)) { + if (policy && !policy_check_hello(policy, ucred)) { log_error("Policy denied HELLO"); return -EPERM; } @@ -1140,6 +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; @@ -1233,9 +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; } @@ -1258,6 +1275,12 @@ int main(int argc, char *argv[]) { 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)); @@ -1417,13 +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, &policy, &ucred, &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)); @@ -1433,14 +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)); @@ -1450,17 +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); } } }