X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=src%2Flibsystemd%2Fsd-bus%2Fbus-kernel.c;h=e03e4471cec11e2dd15dbe47747bc19ce3f3139f;hp=142eb91c64b60c5fcac33d12ddd3e013db0544eb;hb=f9a458c66672992dd34ad0c7cfec3795b897d711;hpb=d704fda9347f3019fd2a14881bcb6df640c36a80 diff --git a/src/libsystemd/sd-bus/bus-kernel.c b/src/libsystemd/sd-bus/bus-kernel.c index 142eb91c6..e03e4471c 100644 --- a/src/libsystemd/sd-bus/bus-kernel.c +++ b/src/libsystemd/sd-bus/bus-kernel.c @@ -204,6 +204,7 @@ static int bus_message_setup_bloom(sd_bus_message *m, struct kdbus_bloom_filter static int bus_message_setup_kmsg(sd_bus *b, sd_bus_message *m) { struct bus_body_part *part; struct kdbus_item *d; + const char *destination; bool well_known; uint64_t unique; size_t sz, dl; @@ -219,8 +220,10 @@ static int bus_message_setup_kmsg(sd_bus *b, sd_bus_message *m) { if (m->kdbus) return 0; - if (m->destination) { - r = bus_kernel_parse_unique_name(m->destination, &unique); + destination = m->destination ?: m->destination_ptr; + + if (destination) { + r = bus_kernel_parse_unique_name(destination, &unique); if (r < 0) return r; @@ -244,7 +247,7 @@ static int bus_message_setup_kmsg(sd_bus *b, sd_bus_message *m) { /* Add in well-known destination header */ if (well_known) { - dl = strlen(m->destination); + dl = strlen(destination); sz += ALIGN8(offsetof(struct kdbus_item, str) + dl + 1); } @@ -264,9 +267,17 @@ static int bus_message_setup_kmsg(sd_bus *b, sd_bus_message *m) { m->kdbus->flags = ((m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED) ? 0 : KDBUS_MSG_FLAGS_EXPECT_REPLY) | ((m->header->flags & BUS_MESSAGE_NO_AUTO_START) ? KDBUS_MSG_FLAGS_NO_AUTO_START : 0); - m->kdbus->dst_id = - well_known ? 0 : - m->destination ? unique : KDBUS_DST_ID_BROADCAST; + + if (well_known) { + /* verify_destination_id will usually be 0, which makes the kernel driver only look + * at the provided well-known name. Otherwise, the kernel will make sure the provided + * destination id matches the owner of the provided weel-known-name, and fail if they + * differ. Currently, this is only needed for bus-proxyd. */ + m->kdbus->dst_id = m->verify_destination_id; + } else { + m->kdbus->dst_id = destination ? unique : KDBUS_DST_ID_BROADCAST; + } + m->kdbus->payload_type = KDBUS_PAYLOAD_DBUS; m->kdbus->cookie = (uint64_t) m->header->serial; m->kdbus->priority = m->priority; @@ -284,7 +295,7 @@ static int bus_message_setup_kmsg(sd_bus *b, sd_bus_message *m) { d = m->kdbus->items; if (well_known) - append_destination(&d, m->destination, dl); + append_destination(&d, destination, dl); append_payload_vec(&d, m->header, BUS_MESSAGE_BODY_BEGIN(m)); @@ -299,7 +310,7 @@ static int bus_message_setup_kmsg(sd_bus *b, sd_bus_message *m) { continue; } - if (part->memfd >= 0 && part->sealed && m->destination) { + if (part->memfd >= 0 && part->sealed && destination) { /* Try to send a memfd, if the part is * sealed and this is not a broadcast. Since we can only */ @@ -502,28 +513,75 @@ static int bus_kernel_make_message(sd_bus *bus, struct kdbus_msg *k) { break; } - case KDBUS_ITEM_CREDS: - /* UID/GID/PID are always valid */ - m->creds.uid = (uid_t) d->creds.uid; - m->creds.gid = (gid_t) d->creds.gid; - m->creds.pid = (pid_t) d->creds.pid; - m->creds.mask |= (SD_BUS_CREDS_UID|SD_BUS_CREDS_GID|SD_BUS_CREDS_PID) & bus->creds_mask; - - /* The PID starttime/TID might be missing - * however, when the data is faked by some - * data bus proxy and it lacks that - * information about the real client since - * SO_PEERCRED is used for that */ - - if (d->creds.starttime > 0) { - m->creds.pid_starttime = d->creds.starttime / NSEC_PER_USEC; + case KDBUS_ITEM_PIDS: + + /* The PID starttime/TID might be missing, + * when the data is faked by some data bus + * proxy and it lacks that information about + * the real client since SO_PEERCRED is used + * for that. */ + + if (d->pids.pid > 0) { + m->creds.pid = (pid_t) d->pids.pid; + m->creds.mask |= SD_BUS_CREDS_PID & bus->creds_mask; + } + + if (d->pids.starttime > 0) { + m->creds.pid_starttime = d->pids.starttime / NSEC_PER_USEC; m->creds.mask |= SD_BUS_CREDS_PID_STARTTIME & bus->creds_mask; } - if (d->creds.tid > 0) { - m->creds.tid = (pid_t) d->creds.tid; + if (d->pids.tid > 0) { + m->creds.tid = (pid_t) d->pids.tid; m->creds.mask |= SD_BUS_CREDS_TID & bus->creds_mask; } + + break; + + case KDBUS_ITEM_CREDS: + + /* EUID/SUID/FSUID/EGID/SGID/FSGID might be missing too (see above). */ + + if ((uid_t) d->creds.uid != (uid_t) -1) { + m->creds.uid = (uid_t) d->creds.uid; + m->creds.mask |= SD_BUS_CREDS_UID & bus->creds_mask; + } + + if ((uid_t) d->creds.euid != (uid_t) -1) { + m->creds.euid = (uid_t) d->creds.euid; + m->creds.mask |= SD_BUS_CREDS_EUID & bus->creds_mask; + } + + if ((uid_t) d->creds.suid != (uid_t) -1) { + m->creds.suid = (uid_t) d->creds.suid; + m->creds.mask |= SD_BUS_CREDS_SUID & bus->creds_mask; + } + + if ((uid_t) d->creds.fsuid != (uid_t) -1) { + m->creds.fsuid = (uid_t) d->creds.fsuid; + m->creds.mask |= SD_BUS_CREDS_FSUID & bus->creds_mask; + } + + if ((gid_t) d->creds.gid != (gid_t) -1) { + m->creds.gid = (gid_t) d->creds.gid; + m->creds.mask |= SD_BUS_CREDS_GID & bus->creds_mask; + } + + if ((gid_t) d->creds.egid != (gid_t) -1) { + m->creds.egid = (gid_t) d->creds.egid; + m->creds.mask |= SD_BUS_CREDS_EGID & bus->creds_mask; + } + + if ((gid_t) d->creds.sgid != (gid_t) -1) { + m->creds.sgid = (gid_t) d->creds.sgid; + m->creds.mask |= SD_BUS_CREDS_SGID & bus->creds_mask; + } + + if ((gid_t) d->creds.fsgid != (gid_t) -1) { + m->creds.fsgid = (gid_t) d->creds.fsgid; + m->creds.mask |= SD_BUS_CREDS_FSGID & bus->creds_mask; + } + break; case KDBUS_ITEM_TIMESTAMP: @@ -570,9 +628,15 @@ static int bus_kernel_make_message(sd_bus *bus, struct kdbus_msg *k) { break; case KDBUS_ITEM_AUDIT: - m->creds.audit_session_id = (uint32_t) d->audit.sessionid; - m->creds.audit_login_uid = (uid_t) d->audit.loginuid; - m->creds.mask |= (SD_BUS_CREDS_AUDIT_SESSION_ID|SD_BUS_CREDS_AUDIT_LOGIN_UID) & bus->creds_mask; + if ((uint32_t) d->audit.sessionid != (uint32_t) -1) { + m->creds.audit_session_id = (uint32_t) d->audit.sessionid; + m->creds.mask |= SD_BUS_CREDS_AUDIT_SESSION_ID & bus->creds_mask; + } + + if ((uid_t) d->audit.loginuid != (uid_t) -1) { + m->creds.audit_login_uid = (uid_t) d->audit.loginuid; + m->creds.mask |= SD_BUS_CREDS_AUDIT_LOGIN_UID & bus->creds_mask; + } break; case KDBUS_ITEM_CAPS: @@ -582,19 +646,27 @@ static int bus_kernel_make_message(sd_bus *bus, struct kdbus_msg *k) { break; case KDBUS_ITEM_DST_NAME: - if (!service_name_is_valid(d->str)) - return -EBADMSG; + if (!service_name_is_valid(d->str)) { + r = -EBADMSG; + goto fail; + } destination = d->str; break; case KDBUS_ITEM_OWNED_NAME: - if (!service_name_is_valid(d->name.name)) - return -EBADMSG; - - r = strv_extend(&m->creds.well_known_names, d->name.name); - if (r < 0) + if (!service_name_is_valid(d->name.name)) { + r = -EBADMSG; goto fail; + } + + if (bus->creds_mask & SD_BUS_CREDS_WELL_KNOWN_NAMES) { + r = strv_extend(&m->creds.well_known_names, d->name.name); + if (r < 0) + goto fail; + + m->creds.mask |= SD_BUS_CREDS_WELL_KNOWN_NAMES; + } break; case KDBUS_ITEM_CONN_DESCRIPTION: @@ -602,6 +674,29 @@ static int bus_kernel_make_message(sd_bus *bus, struct kdbus_msg *k) { m->creds.mask |= SD_BUS_CREDS_DESCRIPTION & bus->creds_mask; break; + case KDBUS_ITEM_AUXGROUPS: + + if (bus->creds_mask & SD_BUS_CREDS_SUPPLEMENTARY_GIDS) { + size_t i, n; + uid_t *u; + n = (d->size - offsetof(struct kdbus_item, data64)) / sizeof(uint64_t); + u = new(uid_t, n); + if (!u) { + r = -ENOMEM; + goto fail; + } + + for (i = 0; i < n; i++) + u[i] = (uid_t) d->data64[i]; + + m->creds.supplementary_gids = u; + m->creds.n_supplementary_gids = n; + + m->creds.mask |= SD_BUS_CREDS_SUPPLEMENTARY_GIDS; + } + + break; + case KDBUS_ITEM_FDS: case KDBUS_ITEM_SECLABEL: break; @@ -713,6 +808,9 @@ int bus_kernel_take_fd(sd_bus *b) { if (b->fake_creds_valid) sz += ALIGN8(offsetof(struct kdbus_item, creds) + sizeof(struct kdbus_creds)); + if (b->fake_pids_valid) + sz += ALIGN8(offsetof(struct kdbus_item, pids) + sizeof(struct kdbus_pids)); + if (b->fake_label) { l = strlen(b->fake_label); sz += ALIGN8(offsetof(struct kdbus_item, str) + l + 1); @@ -721,7 +819,7 @@ int bus_kernel_take_fd(sd_bus *b) { hello = alloca0_align(sz, 8); hello->size = sz; hello->flags = b->hello_flags; - hello->attach_flags_send = _KDBUS_ATTACH_ALL; + hello->attach_flags_send = _KDBUS_ATTACH_ANY; hello->attach_flags_recv = b->attach_flags; hello->pool_size = KDBUS_POOL_SIZE; @@ -740,6 +838,14 @@ int bus_kernel_take_fd(sd_bus *b) { item = KDBUS_ITEM_NEXT(item); } + if (b->fake_pids_valid) { + item->size = offsetof(struct kdbus_item, pids) + sizeof(struct kdbus_pids); + item->type = KDBUS_ITEM_PIDS; + item->pids = b->fake_pids; + + item = KDBUS_ITEM_NEXT(item); + } + if (b->fake_label) { item->size = offsetof(struct kdbus_item, str) + l + 1; item->type = KDBUS_ITEM_SECLABEL; @@ -805,13 +911,12 @@ int bus_kernel_connect(sd_bus *b) { } static void close_kdbus_msg(sd_bus *bus, struct kdbus_msg *k) { - struct kdbus_cmd_free cmd; + struct kdbus_cmd_free cmd = {}; struct kdbus_item *d; assert(bus); assert(k); - cmd.flags = 0; cmd.offset = (uint8_t *)k - (uint8_t *)bus->kdbus_buffer; KDBUS_ITEM_FOREACH(d, k, items) { @@ -1080,6 +1185,11 @@ int bus_kernel_read_message(sd_bus *bus, bool hint_priority, int64_t priority) { if (errno == EAGAIN) return 0; + if (errno == EOVERFLOW) { + log_debug("%s: kdbus reports %" PRIu64 " dropped broadcast messages, ignoring.", strna(bus->description), (uint64_t) recv.dropped_msgs); + return 0; + } + return -errno; } @@ -1226,9 +1336,13 @@ int kdbus_translate_attach_flags(uint64_t mask, uint64_t *kdbus_mask) { assert(kdbus_mask); - if (mask & (SD_BUS_CREDS_UID|SD_BUS_CREDS_GID|SD_BUS_CREDS_PID|SD_BUS_CREDS_PID_STARTTIME|SD_BUS_CREDS_TID)) + if (mask & (SD_BUS_CREDS_UID|SD_BUS_CREDS_EUID|SD_BUS_CREDS_SUID|SD_BUS_CREDS_FSUID| + SD_BUS_CREDS_GID|SD_BUS_CREDS_EGID|SD_BUS_CREDS_SGID|SD_BUS_CREDS_FSGID)) m |= KDBUS_ATTACH_CREDS; + if (mask & (SD_BUS_CREDS_PID|SD_BUS_CREDS_PID_STARTTIME|SD_BUS_CREDS_TID)) + m |= KDBUS_ATTACH_PIDS; + if (mask & SD_BUS_CREDS_COMM) m |= KDBUS_ATTACH_PID_COMM; @@ -1259,6 +1373,9 @@ int kdbus_translate_attach_flags(uint64_t mask, uint64_t *kdbus_mask) { if (mask & SD_BUS_CREDS_DESCRIPTION) m |= KDBUS_ATTACH_CONN_DESCRIPTION; + if (mask & SD_BUS_CREDS_SUPPLEMENTARY_GIDS) + m |= KDBUS_ATTACH_AUXGROUPS; + *kdbus_mask = m; return 0; } @@ -1271,7 +1388,7 @@ int bus_kernel_create_bus(const char *name, bool world, char **s) { assert(name); assert(s); - fd = open("/dev/kdbus/control", O_RDWR|O_NOCTTY|O_CLOEXEC); + fd = open("/sys/fs/kdbus/control", O_RDWR|O_NOCTTY|O_CLOEXEC); if (fd < 0) return -errno; @@ -1312,7 +1429,7 @@ int bus_kernel_create_bus(const char *name, bool world, char **s) { if (s) { char *p; - p = strjoin("/dev/kdbus/", n->str, "/bus", NULL); + p = strjoin("/sys/fs/kdbus/", n->str, "/bus", NULL); if (!p) { safe_close(fd); return -ENOMEM; @@ -1392,7 +1509,7 @@ int bus_kernel_open_bus_fd(const char *bus, char **path) { int fd; size_t len; - len = strlen("/dev/kdbus/") + DECIMAL_STR_MAX(uid_t) + 1 + strlen(bus) + strlen("/bus") + 1; + len = strlen("/sys/fs/kdbus/") + DECIMAL_STR_MAX(uid_t) + 1 + strlen(bus) + strlen("/bus") + 1; if (path) { p = malloc(len); @@ -1401,7 +1518,7 @@ int bus_kernel_open_bus_fd(const char *bus, char **path) { *path = p; } else p = alloca(len); - sprintf(p, "/dev/kdbus/" UID_FMT "-%s/bus", getuid(), bus); + sprintf(p, "/sys/fs/kdbus/" UID_FMT "-%s/bus", getuid(), bus); fd = open(p, O_RDWR|O_NOCTTY|O_CLOEXEC); if (fd < 0) @@ -1557,7 +1674,7 @@ int bus_kernel_make_starter( (activating ? KDBUS_HELLO_ACTIVATOR : KDBUS_HELLO_POLICY_HOLDER) | (accept_fd ? KDBUS_HELLO_ACCEPT_FD : 0); hello->pool_size = KDBUS_POOL_SIZE; - hello->attach_flags_send = _KDBUS_ATTACH_ALL; + hello->attach_flags_send = _KDBUS_ATTACH_ANY; hello->attach_flags_recv = _KDBUS_ATTACH_ALL; if (ioctl(fd, KDBUS_CMD_HELLO, hello) < 0) @@ -1574,58 +1691,6 @@ int bus_kernel_make_starter( return fd; } -int bus_kernel_create_domain(const char *name, char **s) { - struct kdbus_cmd_make *make; - struct kdbus_item *n; - int fd; - - assert(name); - assert(s); - - fd = open("/dev/kdbus/control", O_RDWR|O_NOCTTY|O_CLOEXEC); - if (fd < 0) - return -errno; - - make = alloca0_align(ALIGN8(offsetof(struct kdbus_cmd_make, items) + - offsetof(struct kdbus_item, str) + - strlen(name) + 1), - 8); - - n = make->items; - strcpy(n->str, name); - n->size = offsetof(struct kdbus_item, str) + strlen(n->str) + 1; - n->type = KDBUS_ITEM_MAKE_NAME; - - make->size = ALIGN8(offsetof(struct kdbus_cmd_make, items) + n->size); - make->flags = KDBUS_MAKE_ACCESS_WORLD; - - if (ioctl(fd, KDBUS_CMD_DOMAIN_MAKE, make) < 0) { - safe_close(fd); - return -errno; - } - - /* The higher 32bit of the flags field are considered - * 'incompatible flags'. Refuse them all for now. */ - if (make->flags > 0xFFFFFFFFULL) { - safe_close(fd); - return -ENOTSUP; - } - - if (s) { - char *p; - - p = strappend("/dev/kdbus/domain/", name); - if (!p) { - safe_close(fd); - return -ENOMEM; - } - - *s = p; - } - - return fd; -} - int bus_kernel_try_close(sd_bus *bus) { assert(bus); assert(bus->is_kernel);