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Diffstat (limited to 'plugins/sudoers/cvtsudoers_ldif.c')
-rw-r--r--plugins/sudoers/cvtsudoers_ldif.c665
1 files changed, 665 insertions, 0 deletions
diff --git a/plugins/sudoers/cvtsudoers_ldif.c b/plugins/sudoers/cvtsudoers_ldif.c
new file mode 100644
index 0000000..0f43a5a
--- /dev/null
+++ b/plugins/sudoers/cvtsudoers_ldif.c
@@ -0,0 +1,665 @@
+/*
+ * Copyright (c) 2018 Todd C. Miller <Todd.Miller@sudo.ws>
+ *
+ * Permission to use, copy, modify, and 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.
+ */
+
+/*
+ * This is an open source non-commercial project. Dear PVS-Studio, please check it.
+ * PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
+ */
+
+#include <config.h>
+
+#include <sys/types.h>
+#include <stdio.h>
+#include <stdlib.h>
+#ifdef HAVE_STRING_H
+# include <string.h>
+#endif /* HAVE_STRING_H */
+#ifdef HAVE_STRINGS_H
+# include <strings.h>
+#endif /* HAVE_STRINGS_H */
+#include <unistd.h>
+#include <stdarg.h>
+
+#include "sudoers.h"
+#include "sudo_ldap.h"
+#include "redblack.h"
+#include "cvtsudoers.h"
+#include "sudo_lbuf.h"
+#include <gram.h>
+
+struct seen_user {
+ const char *name;
+ unsigned long count;
+};
+
+static struct rbtree *seen_users;
+
+static int
+seen_user_compare(const void *aa, const void *bb)
+{
+ const struct seen_user *a = aa;
+ const struct seen_user *b = bb;
+
+ return strcasecmp(a->name, b->name);
+}
+
+static void
+seen_user_free(void *v)
+{
+ struct seen_user *su = v;
+
+ free((void *)su->name);
+ free(su);
+}
+
+static bool
+safe_string(const char *str)
+{
+ unsigned int ch = *str++;
+ debug_decl(safe_string, SUDOERS_DEBUG_UTIL)
+
+ /* Initial char must be <= 127 and not LF, CR, SPACE, ':', '<' */
+ switch (ch) {
+ case '\0':
+ debug_return_bool(true);
+ case '\n':
+ case '\r':
+ case ' ':
+ case ':':
+ case '<':
+ debug_return_bool(false);
+ default:
+ if (ch > 127)
+ debug_return_bool(false);
+ }
+
+ /* Any value <= 127 decimal except NUL, LF, and CR is safe */
+ while ((ch = *str++) != '\0') {
+ if (ch > 127 || ch == '\n' || ch == '\r')
+ debug_return_bool(false);
+ }
+
+ debug_return_bool(true);
+}
+
+static bool
+print_attribute_ldif(FILE *fp, const char *name, const char *value)
+{
+ const unsigned char *uvalue = (unsigned char *)value;
+ char *encoded = NULL;
+ size_t esize;
+ debug_decl(print_attribute_ldif, SUDOERS_DEBUG_UTIL)
+
+ if (!safe_string(value)) {
+ const size_t vlen = strlen(value);
+ esize = ((vlen + 2) / 3 * 4) + 1;
+ if ((encoded = malloc(esize)) == NULL)
+ debug_return_bool(false);
+ if (base64_encode(uvalue, vlen, encoded, esize) == (size_t)-1) {
+ free(encoded);
+ debug_return_bool(false);
+ }
+ fprintf(fp, "%s:: %s\n", name, encoded);
+ free(encoded);
+ } else if (*value != '\0') {
+ fprintf(fp, "%s: %s\n", name, value);
+ } else {
+ fprintf(fp, "%s:\n", name);
+ }
+
+ debug_return_bool(true);
+}
+
+/*
+ * Print sudoOptions from a defaults_list.
+ */
+static bool
+print_options_ldif(FILE *fp, struct defaults_list *options)
+{
+ struct defaults *opt;
+ char *attr_val;
+ int len;
+ debug_decl(print_options_ldif, SUDOERS_DEBUG_UTIL)
+
+ TAILQ_FOREACH(opt, options, entries) {
+ if (opt->type != DEFAULTS)
+ continue; /* don't support bound defaults */
+
+ if (opt->val != NULL) {
+ /* There is no need to double quote values here. */
+ len = asprintf(&attr_val, "%s%s%s", opt->var,
+ opt->op == '+' ? "+=" : opt->op == '-' ? "-=" : "=", opt->val);
+ } else {
+ /* Boolean flag. */
+ len = asprintf(&attr_val, "%s%s",
+ opt->op == false ? "!" : "", opt->var);
+ }
+ if (len == -1) {
+ sudo_fatalx(U_("%s: %s"), __func__,
+ U_("unable to allocate memory"));
+ }
+ print_attribute_ldif(fp, "sudoOption", attr_val);
+ free(attr_val);
+ }
+
+ debug_return_bool(!ferror(fp));
+}
+
+/*
+ * Print global Defaults in a single sudoRole object.
+ */
+static bool
+print_global_defaults_ldif(FILE *fp, struct sudoers_parse_tree *parse_tree,
+ const char *base)
+{
+ unsigned int count = 0;
+ struct sudo_lbuf lbuf;
+ struct defaults *opt;
+ char *dn;
+ debug_decl(print_global_defaults_ldif, SUDOERS_DEBUG_UTIL)
+
+ sudo_lbuf_init(&lbuf, NULL, 0, NULL, 80);
+
+ TAILQ_FOREACH(opt, &parse_tree->defaults, entries) {
+ /* Skip bound Defaults (unsupported). */
+ if (opt->type == DEFAULTS) {
+ count++;
+ } else {
+ lbuf.len = 0;
+ sudo_lbuf_append(&lbuf, "# ");
+ sudoers_format_default_line(&lbuf, parse_tree, opt, false, true);
+ fprintf(fp, "# Unable to translate %s:%d\n%s\n",
+ opt->file, opt->lineno, lbuf.buf);
+ }
+ }
+ sudo_lbuf_destroy(&lbuf);
+
+ if (count == 0)
+ debug_return_bool(true);
+
+ if (asprintf(&dn, "cn=defaults,%s", base) == -1) {
+ sudo_fatalx(U_("%s: %s"), __func__,
+ U_("unable to allocate memory"));
+ }
+ print_attribute_ldif(fp, "dn", dn);
+ free(dn);
+ print_attribute_ldif(fp, "objectClass", "top");
+ print_attribute_ldif(fp, "objectClass", "sudoRole");
+ print_attribute_ldif(fp, "cn", "defaults");
+ print_attribute_ldif(fp, "description", "Default sudoOption's go here");
+
+ print_options_ldif(fp, &parse_tree->defaults);
+ putc('\n', fp);
+
+ debug_return_bool(!ferror(fp));
+}
+
+/*
+ * Print struct member in LDIF format as the specified attribute.
+ * See print_member_int() in parse.c.
+ */
+static void
+print_member_ldif(FILE *fp, struct sudoers_parse_tree *parse_tree, char *name,
+ int type, bool negated, int alias_type, const char *attr_name)
+{
+ struct alias *a;
+ struct member *m;
+ struct sudo_command *c;
+ char *attr_val;
+ int len;
+ debug_decl(print_member_ldif, SUDOERS_DEBUG_UTIL)
+
+ switch (type) {
+ case ALL:
+ print_attribute_ldif(fp, attr_name, negated ? "!ALL" : "ALL");
+ break;
+ case MYSELF:
+ /* Only valid for sudoRunasUser */
+ print_attribute_ldif(fp, attr_name, "");
+ break;
+ case COMMAND:
+ c = (struct sudo_command *)name;
+ len = asprintf(&attr_val, "%s%s%s%s%s%s%s%s",
+ c->digest ? digest_type_to_name(c->digest->digest_type) : "",
+ c->digest ? ":" : "", c->digest ? c->digest->digest_str : "",
+ c->digest ? " " : "", negated ? "!" : "", c->cmnd,
+ c->args ? " " : "", c->args ? c->args : "");
+ if (len == -1) {
+ sudo_fatalx(U_("%s: %s"), __func__,
+ U_("unable to allocate memory"));
+ }
+ print_attribute_ldif(fp, attr_name, attr_val);
+ free(attr_val);
+ break;
+ case ALIAS:
+ if ((a = alias_get(parse_tree, name, alias_type)) != NULL) {
+ TAILQ_FOREACH(m, &a->members, entries) {
+ print_member_ldif(fp, parse_tree, m->name, m->type,
+ negated ? !m->negated : m->negated, alias_type, attr_name);
+ }
+ alias_put(a);
+ break;
+ }
+ /* FALLTHROUGH */
+ default:
+ len = asprintf(&attr_val, "%s%s", negated ? "!" : "", name);
+ if (len == -1) {
+ sudo_fatalx(U_("%s: %s"), __func__,
+ U_("unable to allocate memory"));
+ }
+ print_attribute_ldif(fp, attr_name, attr_val);
+ free(attr_val);
+ break;
+ }
+
+ debug_return;
+}
+
+/*
+ * Print a Cmnd_Spec in LDIF format.
+ * A pointer to the next Cmnd_Spec is passed in to make it possible to
+ * merge adjacent entries that are identical in all but the command.
+ */
+static void
+print_cmndspec_ldif(FILE *fp, struct sudoers_parse_tree *parse_tree,
+ struct cmndspec *cs, struct cmndspec **nextp, struct defaults_list *options)
+{
+ struct cmndspec *next = *nextp;
+ struct member *m;
+ struct tm *tp;
+ bool last_one;
+ char timebuf[sizeof("20120727121554Z")];
+ debug_decl(print_cmndspec_ldif, SUDOERS_DEBUG_UTIL)
+
+ /* Print runasuserlist as sudoRunAsUser attributes */
+ if (cs->runasuserlist != NULL) {
+ TAILQ_FOREACH(m, cs->runasuserlist, entries) {
+ print_member_ldif(fp, parse_tree, m->name, m->type, m->negated,
+ RUNASALIAS, "sudoRunAsUser");
+ }
+ }
+
+ /* Print runasgrouplist as sudoRunAsGroup attributes */
+ if (cs->runasgrouplist != NULL) {
+ TAILQ_FOREACH(m, cs->runasgrouplist, entries) {
+ print_member_ldif(fp, parse_tree, m->name, m->type, m->negated,
+ RUNASALIAS, "sudoRunAsGroup");
+ }
+ }
+
+ /* Print sudoNotBefore and sudoNotAfter attributes */
+ if (cs->notbefore != UNSPEC) {
+ if ((tp = gmtime(&cs->notbefore)) == NULL) {
+ sudo_warn(U_("unable to get GMT time"));
+ } else {
+ if (strftime(timebuf, sizeof(timebuf), "%Y%m%d%H%M%SZ", tp) == 0) {
+ sudo_warnx(U_("unable to format timestamp"));
+ } else {
+ print_attribute_ldif(fp, "sudoNotBefore", timebuf);
+ }
+ }
+ }
+ if (cs->notafter != UNSPEC) {
+ if ((tp = gmtime(&cs->notafter)) == NULL) {
+ sudo_warn(U_("unable to get GMT time"));
+ } else {
+ if (strftime(timebuf, sizeof(timebuf), "%Y%m%d%H%M%SZ", tp) == 0) {
+ sudo_warnx(U_("unable to format timestamp"));
+ } else {
+ print_attribute_ldif(fp, "sudoNotAfter", timebuf);
+ }
+ }
+ }
+
+ /* Print timeout as a sudoOption. */
+ if (cs->timeout > 0) {
+ char *attr_val;
+ if (asprintf(&attr_val, "command_timeout=%d", cs->timeout) == -1) {
+ sudo_fatalx(U_("%s: %s"), __func__,
+ U_("unable to allocate memory"));
+ }
+ print_attribute_ldif(fp, "sudoOption", attr_val);
+ free(attr_val);
+ }
+
+ /* Print tags as sudoOption attributes */
+ if (TAGS_SET(cs->tags)) {
+ struct cmndtag tag = cs->tags;
+
+ if (tag.nopasswd != UNSPEC) {
+ print_attribute_ldif(fp, "sudoOption",
+ tag.nopasswd ? "!authenticate" : "authenticate");
+ }
+ if (tag.noexec != UNSPEC) {
+ print_attribute_ldif(fp, "sudoOption",
+ tag.noexec ? "noexec" : "!noexec");
+ }
+ if (tag.send_mail != UNSPEC) {
+ if (tag.send_mail) {
+ print_attribute_ldif(fp, "sudoOption", "mail_all_cmnds");
+ } else {
+ print_attribute_ldif(fp, "sudoOption", "!mail_all_cmnds");
+ print_attribute_ldif(fp, "sudoOption", "!mail_always");
+ print_attribute_ldif(fp, "sudoOption", "!mail_no_perms");
+ }
+ }
+ if (tag.setenv != UNSPEC && tag.setenv != IMPLIED) {
+ print_attribute_ldif(fp, "sudoOption",
+ tag.setenv ? "setenv" : "!setenv");
+ }
+ if (tag.follow != UNSPEC) {
+ print_attribute_ldif(fp, "sudoOption",
+ tag.follow ? "sudoedit_follow" : "!sudoedit_follow");
+ }
+ if (tag.log_input != UNSPEC) {
+ print_attribute_ldif(fp, "sudoOption",
+ tag.log_input ? "log_input" : "!log_input");
+ }
+ if (tag.log_output != UNSPEC) {
+ print_attribute_ldif(fp, "sudoOption",
+ tag.log_output ? "log_output" : "!log_output");
+ }
+ }
+ print_options_ldif(fp, options);
+
+#ifdef HAVE_SELINUX
+ /* Print SELinux role/type */
+ if (cs->role != NULL && cs->type != NULL) {
+ char *attr_val;
+ int len;
+
+ len = asprintf(&attr_val, "role=%s", cs->role);
+ if (len == -1) {
+ sudo_fatalx(U_("%s: %s"), __func__,
+ U_("unable to allocate memory"));
+ }
+ print_attribute_ldif(fp, "sudoOption", attr_val);
+ free(attr_val);
+
+ len = asprintf(&attr_val, "type=%s", cs->type);
+ if (len == -1) {
+ sudo_fatalx(U_("%s: %s"), __func__,
+ U_("unable to allocate memory"));
+ }
+ print_attribute_ldif(fp, "sudoOption", attr_val);
+ free(attr_val);
+ }
+#endif /* HAVE_SELINUX */
+
+#ifdef HAVE_PRIV_SET
+ /* Print Solaris privs/limitprivs */
+ if (cs->privs != NULL || cs->limitprivs != NULL) {
+ char *attr_val;
+ int len;
+
+ if (cs->privs != NULL) {
+ len = asprintf(&attr_val, "privs=%s", cs->privs);
+ if (len == -1) {
+ sudo_fatalx(U_("%s: %s"), __func__,
+ U_("unable to allocate memory"));
+ }
+ print_attribute_ldif(fp, "sudoOption", attr_val);
+ free(attr_val);
+ }
+ if (cs->limitprivs != NULL) {
+ len = asprintf(&attr_val, "limitprivs=%s", cs->limitprivs);
+ if (len == -1) {
+ sudo_fatalx(U_("%s: %s"), __func__,
+ U_("unable to allocate memory"));
+ }
+ print_attribute_ldif(fp, "sudoOption", attr_val);
+ free(attr_val);
+ }
+ }
+#endif /* HAVE_PRIV_SET */
+
+ /*
+ * Merge adjacent commands with matching tags, runas, SELinux
+ * role/type and Solaris priv settings.
+ */
+ for (;;) {
+ /* Does the next entry differ only in the command itself? */
+ /* XXX - move into a function that returns bool */
+ /* XXX - TAG_SET does not account for implied SETENV */
+ last_one = next == NULL ||
+ RUNAS_CHANGED(cs, next) || TAGS_CHANGED(cs->tags, next->tags)
+#ifdef HAVE_PRIV_SET
+ || cs->privs != next->privs || cs->limitprivs != next->limitprivs
+#endif /* HAVE_PRIV_SET */
+#ifdef HAVE_SELINUX
+ || cs->role != next->role || cs->type != next->type
+#endif /* HAVE_SELINUX */
+ ;
+
+ print_member_ldif(fp, parse_tree, cs->cmnd->name, cs->cmnd->type,
+ cs->cmnd->negated, CMNDALIAS, "sudoCommand");
+ if (last_one)
+ break;
+ cs = next;
+ next = TAILQ_NEXT(cs, entries);
+ }
+
+ *nextp = next;
+
+ debug_return;
+}
+
+/*
+ * Convert user name to cn, avoiding duplicates and quoting as needed.
+ * See http://www.faqs.org/rfcs/rfc2253.html
+ */
+static char *
+user_to_cn(const char *user)
+{
+ struct seen_user key, *su = NULL;
+ struct rbnode *node;
+ const char *src;
+ char *cn, *dst;
+ size_t size;
+ debug_decl(user_to_cn, SUDOERS_DEBUG_UTIL)
+
+ /* Allocate as much as we could possibly need. */
+ size = (2 * strlen(user)) + 64 + 1;
+ if ((cn = malloc(size)) == NULL)
+ goto bad;
+
+ /*
+ * Increment the number of times we have seen this user.
+ */
+ key.name = user;
+ node = rbfind(seen_users, &key);
+ if (node != NULL) {
+ su = node->data;
+ } else {
+ if ((su = malloc(sizeof(*su))) == NULL)
+ goto bad;
+ su->count = 0;
+ if ((su->name = strdup(user)) == NULL)
+ goto bad;
+ if (rbinsert(seen_users, su, NULL) != 0)
+ goto bad;
+ }
+
+ /* Build cn, quoting special chars as needed (we allocated 2 x len). */
+ for (src = user, dst = cn; *src != '\0'; src++) {
+ switch (*src) {
+ case ',':
+ case '+':
+ case '"':
+ case '\\':
+ case '<':
+ case '>':
+ case '#':
+ case ';':
+ *dst++ = '\\'; /* always escape */
+ break;
+ case ' ':
+ if (src == user || src[1] == '\0')
+ *dst++ = '\\'; /* only escape at beginning or end of string */
+ break;
+ default:
+ break;
+ }
+ *dst++ = *src;
+ }
+ *dst = '\0';
+
+ /* Append count if there are duplicate users (cn must be unique). */
+ if (su->count != 0) {
+ size -= (size_t)(dst - cn);
+ if ((size_t)snprintf(dst, size, "_%lu", su->count) >= size) {
+ sudo_warnx(U_("internal error, %s overflow"), __func__);
+ goto bad;
+ }
+ }
+ su->count++;
+
+ debug_return_str(cn);
+bad:
+ if (su != NULL && su->count == 0)
+ seen_user_free(su);
+ free(cn);
+ debug_return_str(NULL);
+}
+
+/*
+ * Print a single User_Spec.
+ */
+static bool
+print_userspec_ldif(FILE *fp, struct sudoers_parse_tree *parse_tree,
+ struct userspec *us, struct cvtsudoers_config *conf)
+{
+ struct privilege *priv;
+ struct member *m;
+ struct cmndspec *cs, *next;
+ debug_decl(print_userspec_ldif, SUDOERS_DEBUG_UTIL)
+
+ /*
+ * Each userspec struct may contain multiple privileges for
+ * the user. We export each privilege as a separate sudoRole
+ * object for simplicity's sake.
+ */
+ TAILQ_FOREACH(priv, &us->privileges, entries) {
+ TAILQ_FOREACH_SAFE(cs, &priv->cmndlist, entries, next) {
+ const char *base = conf->sudoers_base;
+ char *cn, *dn;
+
+ /*
+ * Increment the number of times we have seen this user.
+ * If more than one user is listed, just use the first one.
+ */
+ m = TAILQ_FIRST(&us->users);
+ cn = user_to_cn(m->type == ALL ? "ALL" : m->name);
+ if (cn == NULL || asprintf(&dn, "cn=%s,%s", cn, base) == -1) {
+ sudo_fatalx(U_("%s: %s"), __func__,
+ U_("unable to allocate memory"));
+ }
+
+ print_attribute_ldif(fp, "dn", dn);
+ print_attribute_ldif(fp, "objectClass", "top");
+ print_attribute_ldif(fp, "objectClass", "sudoRole");
+ print_attribute_ldif(fp, "cn", cn);
+ free(cn);
+ free(dn);
+
+ TAILQ_FOREACH(m, &us->users, entries) {
+ print_member_ldif(fp, parse_tree, m->name, m->type, m->negated,
+ USERALIAS, "sudoUser");
+ }
+
+ TAILQ_FOREACH(m, &priv->hostlist, entries) {
+ print_member_ldif(fp, parse_tree, m->name, m->type, m->negated,
+ HOSTALIAS, "sudoHost");
+ }
+
+ print_cmndspec_ldif(fp, parse_tree, cs, &next, &priv->defaults);
+
+ if (conf->sudo_order != 0) {
+ char numbuf[(((sizeof(conf->sudo_order) * 8) + 2) / 3) + 2];
+ if (conf->order_max != 0 && conf->sudo_order > conf->order_max) {
+ sudo_fatalx(U_("too many sudoers entries, maximum %u"),
+ conf->order_padding);
+ }
+ (void)snprintf(numbuf, sizeof(numbuf), "%u", conf->sudo_order);
+ print_attribute_ldif(fp, "sudoOrder", numbuf);
+ putc('\n', fp);
+ conf->sudo_order += conf->order_increment;
+ }
+ }
+ }
+
+ debug_return_bool(!ferror(fp));
+}
+
+/*
+ * Print User_Specs.
+ */
+static bool
+print_userspecs_ldif(FILE *fp, struct sudoers_parse_tree *parse_tree,
+ struct cvtsudoers_config *conf)
+{
+ struct userspec *us;
+ debug_decl(print_userspecs_ldif, SUDOERS_DEBUG_UTIL)
+
+ TAILQ_FOREACH(us, &parse_tree->userspecs, entries) {
+ if (!print_userspec_ldif(fp, parse_tree, us, conf))
+ debug_return_bool(false);
+ }
+ debug_return_bool(true);
+}
+
+/*
+ * Export the parsed sudoers file in LDIF format.
+ */
+bool
+convert_sudoers_ldif(struct sudoers_parse_tree *parse_tree,
+ const char *output_file, struct cvtsudoers_config *conf)
+{
+ bool ret = true;
+ FILE *output_fp = stdout;
+ debug_decl(convert_sudoers_ldif, SUDOERS_DEBUG_UTIL)
+
+ if (conf->sudoers_base == NULL) {
+ sudo_fatalx(U_("the SUDOERS_BASE environment variable is not set and the -b option was not specified."));
+ }
+
+ if (output_file != NULL && strcmp(output_file, "-") != 0) {
+ if ((output_fp = fopen(output_file, "w")) == NULL)
+ sudo_fatal(U_("unable to open %s"), output_file);
+ }
+
+ /* Create a dictionary of already-seen users. */
+ seen_users = rbcreate(seen_user_compare);
+
+ /* Dump global Defaults in LDIF format. */
+ if (!ISSET(conf->suppress, SUPPRESS_DEFAULTS))
+ print_global_defaults_ldif(output_fp, parse_tree, conf->sudoers_base);
+
+ /* Dump User_Specs in LDIF format, expanding Aliases. */
+ if (!ISSET(conf->suppress, SUPPRESS_PRIVS))
+ print_userspecs_ldif(output_fp, parse_tree, conf);
+
+ /* Clean up. */
+ rbdestroy(seen_users, seen_user_free);
+
+ (void)fflush(output_fp);
+ if (ferror(output_fp))
+ ret = false;
+ if (output_fp != stdout)
+ fclose(output_fp);
+
+ debug_return_bool(ret);
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-18 04:13:58 +0000