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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 15:35:18 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 15:35:18 +0000 |
commit | b750101eb236130cf056c675997decbac904cc49 (patch) | |
tree | a5df1a06754bdd014cb975c051c83b01c9a97532 /src/nss-mymachines/nss-mymachines.c | |
parent | Initial commit. (diff) | |
download | systemd-upstream.tar.xz systemd-upstream.zip |
Adding upstream version 252.22.upstream/252.22upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | src/nss-mymachines/nss-mymachines.c | 440 |
1 files changed, 440 insertions, 0 deletions
diff --git a/src/nss-mymachines/nss-mymachines.c b/src/nss-mymachines/nss-mymachines.c new file mode 100644 index 0000000..c64e79b --- /dev/null +++ b/src/nss-mymachines/nss-mymachines.c @@ -0,0 +1,440 @@ +/* SPDX-License-Identifier: LGPL-2.1-or-later */ + +#include <netdb.h> +#include <nss.h> +#include <pthread.h> + +#include "sd-bus.h" +#include "sd-login.h" + +#include "alloc-util.h" +#include "bus-common-errors.h" +#include "bus-locator.h" +#include "env-util.h" +#include "errno-util.h" +#include "format-util.h" +#include "hostname-util.h" +#include "in-addr-util.h" +#include "log.h" +#include "macro.h" +#include "memory-util.h" +#include "nss-util.h" +#include "signal-util.h" +#include "string-util.h" + +static void setup_logging_once(void) { + static pthread_once_t once = PTHREAD_ONCE_INIT; + assert_se(pthread_once(&once, log_parse_environment_variables) == 0); +} + +#define NSS_ENTRYPOINT_BEGIN \ + BLOCK_SIGNALS(NSS_SIGNALS_BLOCK); \ + setup_logging_once() + +NSS_GETHOSTBYNAME_PROTOTYPES(mymachines); +NSS_GETPW_PROTOTYPES(mymachines); +NSS_GETGR_PROTOTYPES(mymachines); + +static int count_addresses(sd_bus_message *m, int af, unsigned *ret) { + unsigned c = 0; + int r; + + assert(m); + assert(ret); + + while ((r = sd_bus_message_enter_container(m, 'r', "iay")) > 0) { + int family; + + r = sd_bus_message_read(m, "i", &family); + if (r < 0) + return r; + + r = sd_bus_message_skip(m, "ay"); + if (r < 0) + return r; + + r = sd_bus_message_exit_container(m); + if (r < 0) + return r; + + if (af != AF_UNSPEC && family != af) + continue; + + c++; + } + if (r < 0) + return r; + + r = sd_bus_message_rewind(m, false); + if (r < 0) + return r; + + *ret = c; + return 0; +} + +static bool avoid_deadlock(void) { + + /* Check whether this lookup might have a chance of deadlocking because we are called from the service manager + * code activating systemd-machined.service. After all, we shouldn't synchronously do lookups to + * systemd-machined if we are required to finish before it can be started. This of course won't detect all + * possible dead locks of this kind, but it should work for the most obvious cases. */ + + if (geteuid() != 0) /* Ignore the env vars unless we are privileged. */ + return false; + + return streq_ptr(getenv("SYSTEMD_ACTIVATION_UNIT"), "systemd-machined.service") && + streq_ptr(getenv("SYSTEMD_ACTIVATION_SCOPE"), "system"); +} + +enum nss_status _nss_mymachines_gethostbyname4_r( + const char *name, + struct gaih_addrtuple **pat, + char *buffer, size_t buflen, + int *errnop, int *h_errnop, + int32_t *ttlp) { + + struct gaih_addrtuple *r_tuple, *r_tuple_first = NULL; + _cleanup_(sd_bus_message_unrefp) sd_bus_message* reply = NULL; + _cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL; + _cleanup_free_ int *ifindices = NULL; + _cleanup_free_ char *class = NULL; + size_t l, ms, idx; + unsigned i = 0, c = 0; + char *r_name; + int n_ifindices, r; + + PROTECT_ERRNO; + NSS_ENTRYPOINT_BEGIN; + + assert(name); + assert(pat); + assert(buffer); + assert(errnop); + assert(h_errnop); + + r = sd_machine_get_class(name, &class); + if (r < 0) + goto fail; + if (!streq(class, "container")) { + r = -ENOTTY; + goto fail; + } + + n_ifindices = sd_machine_get_ifindices(name, &ifindices); + if (n_ifindices < 0) { + r = n_ifindices; + goto fail; + } + + if (avoid_deadlock()) { + r = -EDEADLK; + goto fail; + } + + r = sd_bus_open_system(&bus); + if (r < 0) + goto fail; + + r = bus_call_method(bus, bus_machine_mgr, "GetMachineAddresses", NULL, &reply, "s", name); + if (r < 0) + goto fail; + + r = sd_bus_message_enter_container(reply, 'a', "(iay)"); + if (r < 0) + goto fail; + + r = count_addresses(reply, AF_UNSPEC, &c); + if (r < 0) + goto fail; + + if (c <= 0) { + *h_errnop = HOST_NOT_FOUND; + return NSS_STATUS_NOTFOUND; + } + + l = strlen(name); + ms = ALIGN(l+1) + ALIGN(sizeof(struct gaih_addrtuple)) * c; + if (buflen < ms) { + UNPROTECT_ERRNO; + *errnop = ERANGE; + *h_errnop = NETDB_INTERNAL; + return NSS_STATUS_TRYAGAIN; + } + + /* First, append name */ + r_name = buffer; + memcpy(r_name, name, l+1); + idx = ALIGN(l+1); + + /* Second, append addresses */ + r_tuple_first = (struct gaih_addrtuple*) (buffer + idx); + while ((r = sd_bus_message_enter_container(reply, 'r', "iay")) > 0) { + int family; + const void *a; + size_t sz; + + r = sd_bus_message_read(reply, "i", &family); + if (r < 0) + goto fail; + + r = sd_bus_message_read_array(reply, 'y', &a, &sz); + if (r < 0) + goto fail; + + r = sd_bus_message_exit_container(reply); + if (r < 0) + goto fail; + + if (!IN_SET(family, AF_INET, AF_INET6)) { + r = -EAFNOSUPPORT; + goto fail; + } + + if (sz != FAMILY_ADDRESS_SIZE(family)) { + r = -EINVAL; + goto fail; + } + + r_tuple = (struct gaih_addrtuple*) (buffer + idx); + r_tuple->next = i == c-1 ? NULL : (struct gaih_addrtuple*) ((char*) r_tuple + ALIGN(sizeof(struct gaih_addrtuple))); + r_tuple->name = r_name; + r_tuple->family = family; + r_tuple->scopeid = n_ifindices == 1 ? ifindices[0] : 0; + memcpy(r_tuple->addr, a, sz); + + idx += ALIGN(sizeof(struct gaih_addrtuple)); + i++; + } + + assert(i == c); + + r = sd_bus_message_exit_container(reply); + if (r < 0) + goto fail; + + assert(idx == ms); + + if (*pat) + **pat = *r_tuple_first; + else + *pat = r_tuple_first; + + if (ttlp) + *ttlp = 0; + + /* Explicitly reset both *h_errnop and h_errno to work around + * https://bugzilla.redhat.com/show_bug.cgi?id=1125975 */ + *h_errnop = NETDB_SUCCESS; + h_errno = 0; + + return NSS_STATUS_SUCCESS; + +fail: + UNPROTECT_ERRNO; + *errnop = -r; + *h_errnop = NO_RECOVERY; + return NSS_STATUS_UNAVAIL; +} + +enum nss_status _nss_mymachines_gethostbyname3_r( + const char *name, + int af, + struct hostent *result, + char *buffer, size_t buflen, + int *errnop, int *h_errnop, + int32_t *ttlp, + char **canonp) { + + _cleanup_(sd_bus_message_unrefp) sd_bus_message* reply = NULL; + _cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL; + _cleanup_free_ char *class = NULL; + unsigned c = 0, i = 0; + char *r_name, *r_aliases, *r_addr, *r_addr_list; + size_t l, idx, ms, alen; + int r; + + PROTECT_ERRNO; + NSS_ENTRYPOINT_BEGIN; + + assert(name); + assert(result); + assert(buffer); + assert(errnop); + assert(h_errnop); + + if (af == AF_UNSPEC) + af = AF_INET; + + if (af != AF_INET && af != AF_INET6) { + r = -EAFNOSUPPORT; + goto fail; + } + + r = sd_machine_get_class(name, &class); + if (r < 0) + goto fail; + if (!streq(class, "container")) { + r = -ENOTTY; + goto fail; + } + + if (avoid_deadlock()) { + r = -EDEADLK; + goto fail; + } + + r = sd_bus_open_system(&bus); + if (r < 0) + goto fail; + + r = bus_call_method(bus, bus_machine_mgr, "GetMachineAddresses", NULL, &reply, "s", name); + if (r < 0) + goto fail; + + r = sd_bus_message_enter_container(reply, 'a', "(iay)"); + if (r < 0) + goto fail; + + r = count_addresses(reply, af, &c); + if (r < 0) + goto fail; + + if (c <= 0) { + *h_errnop = HOST_NOT_FOUND; + return NSS_STATUS_NOTFOUND; + } + + alen = FAMILY_ADDRESS_SIZE(af); + l = strlen(name); + + ms = ALIGN(l+1) + c * ALIGN(alen) + (c+2) * sizeof(char*); + + if (buflen < ms) { + UNPROTECT_ERRNO; + *errnop = ERANGE; + *h_errnop = NETDB_INTERNAL; + return NSS_STATUS_TRYAGAIN; + } + + /* First, append name */ + r_name = buffer; + memcpy(r_name, name, l+1); + idx = ALIGN(l+1); + + /* Second, create aliases array */ + r_aliases = buffer + idx; + ((char**) r_aliases)[0] = NULL; + idx += sizeof(char*); + + /* Third, append addresses */ + r_addr = buffer + idx; + while ((r = sd_bus_message_enter_container(reply, 'r', "iay")) > 0) { + int family; + const void *a; + size_t sz; + + r = sd_bus_message_read(reply, "i", &family); + if (r < 0) + goto fail; + + r = sd_bus_message_read_array(reply, 'y', &a, &sz); + if (r < 0) + goto fail; + + r = sd_bus_message_exit_container(reply); + if (r < 0) + goto fail; + + if (family != af) + continue; + + if (sz != alen) { + r = -EINVAL; + goto fail; + } + + memcpy(r_addr + i*ALIGN(alen), a, alen); + i++; + } + + assert(i == c); + idx += c * ALIGN(alen); + + r = sd_bus_message_exit_container(reply); + if (r < 0) + goto fail; + + /* Third, append address pointer array */ + r_addr_list = buffer + idx; + for (i = 0; i < c; i++) + ((char**) r_addr_list)[i] = r_addr + i*ALIGN(alen); + + ((char**) r_addr_list)[i] = NULL; + idx += (c+1) * sizeof(char*); + + assert(idx == ms); + + result->h_name = r_name; + result->h_aliases = (char**) r_aliases; + result->h_addrtype = af; + result->h_length = alen; + result->h_addr_list = (char**) r_addr_list; + + if (ttlp) + *ttlp = 0; + + if (canonp) + *canonp = r_name; + + /* Explicitly reset both *h_errnop and h_errno to work around + * https://bugzilla.redhat.com/show_bug.cgi?id=1125975 */ + *h_errnop = NETDB_SUCCESS; + h_errno = 0; + + return NSS_STATUS_SUCCESS; + +fail: + UNPROTECT_ERRNO; + *errnop = -r; + *h_errnop = NO_RECOVERY; + return NSS_STATUS_UNAVAIL; +} + +NSS_GETHOSTBYNAME_FALLBACKS(mymachines); + +enum nss_status _nss_mymachines_getpwnam_r( + const char *name, + struct passwd *pwd, + char *buffer, size_t buflen, + int *errnop) { + + return NSS_STATUS_NOTFOUND; +} + +enum nss_status _nss_mymachines_getpwuid_r( + uid_t uid, + struct passwd *pwd, + char *buffer, size_t buflen, + int *errnop) { + + return NSS_STATUS_NOTFOUND; +} + +enum nss_status _nss_mymachines_getgrnam_r( + const char *name, + struct group *gr, + char *buffer, size_t buflen, + int *errnop) { + + return NSS_STATUS_NOTFOUND; +} + +enum nss_status _nss_mymachines_getgrgid_r( + gid_t gid, + struct group *gr, + char *buffer, size_t buflen, + int *errnop) { + + return NSS_STATUS_NOTFOUND; +} |