--- /dev/null
+/*
+ * setpriv(1) - set various kernel privilege bits and run something
+ *
+ * Copyright (C) 2012 Andy Lutomirski <luto@amacapital.net>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2, or (at your option) any
+ * later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include <cap-ng.h>
+#include <errno.h>
+#include <getopt.h>
+#include <grp.h>
+#include <linux/securebits.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/prctl.h>
+#include <unistd.h>
+
+#include "bitops.h"
+#include "c.h"
+#include "closestream.h"
+#include "nls.h"
+#include "optutils.h"
+#include "strutils.h"
+#include "xalloc.h"
+
+#ifndef PR_SET_NO_NEW_PRIVS
+# define PR_SET_NO_NEW_PRIVS 38
+#endif
+#ifndef PR_GET_NO_NEW_PRIVS
+# define PR_GET_NO_NEW_PRIVS 39
+#endif
+
+#define SETPRIV_EXIT_PRIVERR 127 /* how we exit when we fail to set privs */
+
+/*
+ * Note: We are subject to https://bugzilla.redhat.com/show_bug.cgi?id=895105
+ * and we will therefore have problems if new capabilities are added. Once
+ * that bug is fixed, I'll (Andy Lutomirski) submit a corresponding fix to
+ * setpriv. In the mean time, the code here tries to work reasonably well.
+ */
+
+struct privctx {
+ /* bit arrays -- see include/bitops.h */
+ unsigned int
+ nnp:1, /* no_new_privs */
+ have_ruid:1, /* real uid */
+ have_euid:1, /* effective uid */
+ have_rgid:1, /* real gid */
+ have_egid:1, /* effective gid */
+ have_groups:1, /* add groups */
+ keep_groups:1, /* keep groups */
+ clear_groups:1, /* remove groups */
+ have_securebits:1; /* remove groups */
+
+ /* uids and gids */
+ uid_t ruid, euid;
+ gid_t rgid, egid;
+
+ /* supplementary groups */
+ size_t num_groups;
+ gid_t *groups;
+
+ /* caps */
+ const char *caps_to_inherit;
+ const char *bounding_set;
+
+ /* securebits */
+ int securebits;
+
+ /* LSMs */
+ const char *selinux_label;
+ const char *apparmor_profile;
+};
+
+static void __attribute__((__noreturn__)) usage(FILE *out)
+{
+ fputs(USAGE_HEADER, out);
+ fprintf(out, _(" %s [options] <program> [args...]\n"), program_invocation_short_name);
+ fputs(USAGE_OPTIONS, out);
+ fputs(_(" -d, --dump show current state (and do not exec anything)\n"), out);
+ fputs(_(" --nnp, --no-new-privs disallow granting new privileges\n"), out);
+ fputs(_(" --inh-caps <caps,...> set inheritable capabilities\n"), out);
+ fputs(_(" --bounding-set <caps> set capability bounding set\n"), out);
+ fputs(_(" --ruid <uid> set real uid\n"), out);
+ fputs(_(" --euid <uid> set effective uid\n"), out);
+ fputs(_(" --rgid <gid> set real gid\n"), out);
+ fputs(_(" --egid <gid> set effective gid\n"), out);
+ fputs(_(" --reuid <uid> set real and effective uid\n"), out);
+ fputs(_(" --regid <gid> set real and effective gid\n"), out);
+ fputs(_(" --clear-groups clear supplementary groups\n"), out);
+ fputs(_(" --keep-groups keep supplementary groups\n"), out);
+ fputs(_(" --groups <group,...> set supplementary groups\n"), out);
+ fputs(_(" --securebits <bits> set securebits\n"), out);
+ fputs(_(" --selinux-label <label> set SELinux label (requires process:transition)\n"), out);
+ fputs(_(" --apparmor-profile <pr> set AppArmor profile (requires onexec permission)\n"), out);
+ fputs(USAGE_SEPARATOR, out);
+ fputs(USAGE_HELP, out);
+ fputs(USAGE_VERSION, out);
+ fputs(USAGE_SEPARATOR, out);
+ fputs(_(" This tool can be dangerous. Read the manpage, and be careful.\n"), out);
+ fprintf(out, USAGE_MAN_TAIL("setpriv(1)"));
+
+ exit(out == stderr ? EXIT_FAILURE : EXIT_SUCCESS);
+}
+
+static int real_cap_last_cap(void)
+{
+ /* CAP_LAST_CAP is untrustworthy. */
+ static int ret = -1;
+ int matched;
+ FILE *f;
+
+ if (ret != -1)
+ return ret;
+
+ f = fopen("/proc/sys/kernel/cap_last_cap", "r");
+ if (!f) {
+ ret = CAP_LAST_CAP; /* guess */
+ return ret;
+ }
+
+ matched = fscanf(f, "%d", &ret);
+ fclose(f);
+
+ if (matched != 1)
+ ret = CAP_LAST_CAP; /* guess */
+
+ return ret;
+}
+
+/* Returns the number of capabilities printed. */
+static int print_caps(FILE *f, capng_type_t which)
+{
+ int i, n = 0, max = real_cap_last_cap();
+
+ for (i = 0; i <= max; i++) {
+ if (capng_have_capability(which, i)) {
+ const char *name = capng_capability_to_name(i);
+ if (n)
+ fputc(',', f);
+ if (name)
+ fputs(name, f);
+ else
+ /* cap-ng has very poor handling of
+ * CAP_LAST_CAP changes. This is the
+ * best we can do. */
+ printf("cap_%d", i);
+ n++;
+ }
+ }
+ return n;
+}
+
+static void dump_one_secbit(int *first, int *bits, int bit, const char *name)
+{
+ if (*bits & bit) {
+ if (!*first)
+ printf(",");
+ else
+ *first = 0;
+ fputs(name, stdout);
+ *bits &= ~bit;
+ }
+}
+
+static void dump_securebits(void)
+{
+ int first = 1;
+ int bits = prctl(PR_GET_SECUREBITS, 0, 0, 0, 0);
+
+ if (bits < 0) {
+ warnx(_("getting process secure bits failed"));
+ return;
+ }
+
+ printf(_("Securebits: "));
+
+ dump_one_secbit(&first, &bits, SECBIT_NOROOT, "noroot");
+ dump_one_secbit(&first, &bits, SECBIT_NOROOT_LOCKED, "noroot_locked");
+ dump_one_secbit(&first, &bits, SECBIT_NO_SETUID_FIXUP,
+ "no_setuid_fixup");
+ dump_one_secbit(&first, &bits, SECBIT_NO_SETUID_FIXUP_LOCKED,
+ "no_setuid_fixup_locked");
+ bits &= ~SECBIT_KEEP_CAPS;
+ dump_one_secbit(&first, &bits, SECBIT_KEEP_CAPS_LOCKED,
+ "keep_caps_locked");
+ if (bits) {
+ if (!first)
+ printf(",");
+ else
+ first = 0;
+ printf("0x%x", (unsigned)bits);
+ }
+
+ if (first)
+ printf(_("[none]\n"));
+ else
+ printf("\n");
+}
+
+static void dump_label(const char *name)
+{
+ char buf[4097];
+ ssize_t len;
+ int fd, e;
+
+ fd = open("/proc/self/attr/current", O_RDONLY);
+ if (fd == -1) {
+ warnx(_("cannot open %s"), "/proc/self/attr/current");
+ return;
+ }
+
+ len = read(fd, buf, sizeof(buf));
+ e = errno;
+ close(fd);
+ if (len < 0) {
+ errno = e;
+ warnx(_("read failed: %s"), name);
+ return;
+ }
+ if (sizeof(buf) - 1 <= (size_t)len) {
+ warnx(_("%s: too long"), name);
+ return;
+ }
+
+ buf[len] = 0;
+ if (0 < len && buf[len - 1] == '\n')
+ buf[len - 1] = 0;
+ printf("%s: %s\n", name, buf);
+}
+
+static void dump_groups(void)
+{
+ int n = getgroups(0, 0);
+ gid_t *groups;
+ if (n < 0) {
+ warn("getgroups failed");
+ return;
+ }
+
+ groups = alloca(n * sizeof(gid_t));
+ n = getgroups(n, groups);
+ if (n < 0) {
+ warn("getgroups failed");
+ return;
+ }
+
+ printf(_("Supplementary groups: "));
+ if (n == 0)
+ printf(_("[none]"));
+ else {
+ int i;
+ for (i = 0; i < n; i++) {
+ if (0 < i)
+ printf(",");
+ printf("%ld", (long)groups[i]);
+ }
+ }
+ printf("\n");
+}
+
+static void dump(int dumplevel)
+{
+ int x;
+ uid_t ru, eu, su;
+ gid_t rg, eg, sg;
+
+ if (getresuid(&ru, &eu, &su) == 0) {
+ printf(_("uid: %u\n"), ru);
+ printf(_("euid: %u\n"), eu);
+ /* Saved and fs uids always equal euid. */
+ if (3 <= dumplevel)
+ printf(_("suid: %u\n"), su);
+ } else
+ warn(_("getresuid failed"));
+
+ if (getresgid(&rg, &eg, &sg) == 0) {
+ printf("gid: %ld\n", (long)rg);
+ printf("egid: %ld\n", (long)eg);
+ /* Saved and fs gids always equal egid. */
+ if (dumplevel >= 3)
+ printf("sgid: %ld\n", (long)sg);
+ } else
+ warn(_("getresgid failed"));
+
+ dump_groups();
+
+ x = prctl(PR_GET_NO_NEW_PRIVS, 0, 0, 0, 0);
+ if (0 <= x)
+ printf("no_new_privs: %d\n", x);
+ else
+ warn("setting no_new_privs failed");
+
+ if (2 <= dumplevel) {
+ printf(_("Effective capabilities: "));
+ if (print_caps(stdout, CAPNG_EFFECTIVE) == 0)
+ printf(_("[none]"));
+ printf("\n");
+
+ printf(_("Permitted capabilities: "));
+ if (print_caps(stdout, CAPNG_PERMITTED) == 0)
+ printf(_("[none]"));
+ printf("\n");
+ }
+
+ printf(_("Inheritable capabilities: "));
+ if (print_caps(stdout, CAPNG_INHERITABLE) == 0)
+ printf(_("[none]"));
+ printf("\n");
+
+ printf(_("Capability bounding set: "));
+ if (print_caps(stdout, CAPNG_BOUNDING_SET) == 0)
+ printf(_("[none]"));
+ printf("\n");
+
+ dump_securebits();
+
+ if (access("/sys/fs/selinux", F_OK) == 0)
+ dump_label(_("SELinux label"));
+
+ if (access("/sys/kernel/security/apparmor", F_OK) == 0) {
+ dump_label(_("AppArmor profile"));
+ }
+}
+
+static void list_known_caps(void)
+{
+ int i, max = real_cap_last_cap();
+
+ for (i = 0; i <= max; i++) {
+ const char *name = capng_capability_to_name(i);
+ if (name)
+ printf("%s\n", name);
+ else
+ warnx(_("cap %d: libcap-ng is broken"), i);
+ }
+}
+
+static void parse_groups(struct privctx *opts, const char *str)
+{
+ char *groups = xstrdup(str);
+ char *buf = groups; /* We'll reuse it */
+ char *c;
+ size_t i = 0;
+
+ opts->have_groups = 1;
+ opts->num_groups = 0;
+ while ((c = strsep(&groups, ",")))
+ opts->num_groups++;
+
+ /* Start again */
+ strcpy(buf, str); /* It's exactly the right length */
+ groups = buf;
+
+ opts->groups = xcalloc(opts->num_groups, sizeof(gid_t));
+ while ((c = strsep(&groups, ",")))
+ opts->groups[i++] = (gid_t) strtol_or_err(c,
+ _("Invalid supplementary group id"));
+
+ free(groups);
+}
+
+static void do_setresuid(const struct privctx *opts)
+{
+ uid_t ruid, euid, suid;
+ if (getresuid(&ruid, &euid, &suid) != 0)
+ err(SETPRIV_EXIT_PRIVERR, _("getresuid failed"));
+ if (opts->have_ruid)
+ ruid = opts->ruid;
+ if (opts->have_euid)
+ euid = opts->euid;
+
+ /* Also copy effective to saved (for paranoia). */
+ if (setresuid(ruid, euid, euid) != 0)
+ err(SETPRIV_EXIT_PRIVERR, _("setresuid failed"));
+}
+
+static void do_setresgid(const struct privctx *opts)
+{
+ gid_t rgid, egid, sgid;
+ if (getresgid(&rgid, &egid, &sgid) != 0)
+ err(SETPRIV_EXIT_PRIVERR, _("getresgid failed"));
+ if (opts->have_rgid)
+ rgid = opts->rgid;
+ if (opts->have_egid)
+ egid = opts->egid;
+
+ /* Also copy effective to saved (for paranoia). */
+ if (setresgid(rgid, egid, egid) != 0)
+ err(SETPRIV_EXIT_PRIVERR, _("setresgid failed"));
+}
+
+static void bump_cap(unsigned int cap)
+{
+ if (capng_have_capability(CAPNG_PERMITTED, cap))
+ capng_update(CAPNG_ADD, CAPNG_EFFECTIVE, cap);
+}
+
+static void do_caps(capng_type_t type, const char *caps)
+{
+ char *my_caps = xstrdup(caps);
+ char *c;
+
+ while ((c = strsep(&my_caps, ","))) {
+ capng_act_t action;
+ if (*c == '+')
+ action = CAPNG_ADD;
+ else if (*c == '-')
+ action = CAPNG_DROP;
+ else
+ errx(EXIT_FAILURE, _("bad capability string"));
+
+ if (!strcmp(c + 1, "all")) {
+ int i;
+ /* It would be really bad if -all didn't drop all
+ * caps. It's better to just fail. */
+ if (real_cap_last_cap() > CAP_LAST_CAP)
+ errx(SETPRIV_EXIT_PRIVERR,
+ _("libcap-ng is too old for \"all\" caps"));
+ for (i = 0; i <= CAP_LAST_CAP; i++)
+ capng_update(action, type, i);
+ } else {
+ int cap = capng_name_to_capability(c + 1);
+ if (0 <= cap)
+ capng_update(action, type, cap);
+ else
+ errx(EXIT_FAILURE,
+ _("unknown capability \"%s\""), c + 1);
+ }
+ }
+
+ free(my_caps);
+}
+
+static void parse_securebits(struct privctx *opts, const char *arg)
+{
+ char *buf = xstrdup(arg);
+ char *c;
+
+ opts->have_securebits = 1;
+ opts->securebits = prctl(PR_GET_SECUREBITS, 0, 0, 0, 0);
+ if (opts->securebits < 0)
+ err(SETPRIV_EXIT_PRIVERR, _("getting process secure bits failed"));
+
+ if (opts->securebits & ~(int)(SECBIT_NOROOT |
+ SECBIT_NOROOT_LOCKED |
+ SECBIT_NO_SETUID_FIXUP |
+ SECBIT_NO_SETUID_FIXUP_LOCKED |
+ SECBIT_KEEP_CAPS |
+ SECBIT_KEEP_CAPS_LOCKED))
+ errx(SETPRIV_EXIT_PRIVERR,
+ _("unrecognized securebit set -- refusing to adjust"));
+
+ while ((c = strsep(&buf, ","))) {
+ if (*c != '+' && *c != '-')
+ errx(EXIT_FAILURE, _("bad securebits string"));
+
+ if (!strcmp(c + 1, "all")) {
+ if (*c == '-')
+ opts->securebits = 0;
+ else
+ errx(EXIT_FAILURE,
+ _("+all securebits is not allowed"));
+ } else {
+ int bit;
+ if (!strcmp(c + 1, "noroot"))
+ bit = SECBIT_NOROOT;
+ else if (!strcmp(c + 1, "noroot_locked"))
+ bit = SECBIT_NOROOT_LOCKED;
+ else if (!strcmp(c + 1, "no_setuid_fixup"))
+ bit = SECBIT_NO_SETUID_FIXUP;
+ else if (!strcmp(c + 1, "no_setuid_fixup_locked"))
+ bit = SECBIT_NO_SETUID_FIXUP_LOCKED;
+ else if (!strcmp(c + 1, "keep_caps"))
+ errx(EXIT_FAILURE,
+ _("adjusting keep_caps does not make sense"));
+ else if (!strcmp(c + 1, "keep_caps_locked"))
+ bit = SECBIT_KEEP_CAPS_LOCKED; /* sigh */
+ else
+ errx(EXIT_FAILURE, _("unrecognized securebit"));
+
+ if (*c == '+')
+ opts->securebits |= bit;
+ else
+ opts->securebits &= ~bit;
+ }
+ }
+
+ opts->securebits |= SECBIT_KEEP_CAPS; /* We need it, and it's reset on exec */
+
+ free(buf);
+}
+
+static void do_selinux_label(const char *label)
+{
+ int fd;
+ size_t len;
+
+ if (access("/sys/fs/selinux", F_OK) != 0)
+ errx(SETPRIV_EXIT_PRIVERR, _("SELinux is not running"));
+
+ fd = open("/proc/self/attr/exec", O_RDWR);
+ if (fd == -1)
+ err(SETPRIV_EXIT_PRIVERR,
+ _("cannot open %s"), "/proc/self/attr/exec");
+
+ len = strlen(label);
+ errno = 0;
+ if (write(fd, label, len) != (ssize_t) len)
+ err(SETPRIV_EXIT_PRIVERR,
+ _("write failed: %s"), "/proc/self/attr/exec");
+
+ close(fd);
+}
+
+static void do_apparmor_profile(const char *label)
+{
+ FILE *f;
+
+ if (access("/sys/kernel/security/apparmor", F_OK) != 0)
+ errx(SETPRIV_EXIT_PRIVERR, _("AppArmor is not running"));
+
+ f = fopen("/proc/self/attr/exec", "wx");
+ if (!f)
+ err(SETPRIV_EXIT_PRIVERR,
+ _("cannot open %s"), "/proc/self/attr/exec");
+
+ if (fprintf(f, "changeprofile %s", label) < 0 || fflush(f) != 0
+ || fclose(f) != 0)
+ err(SETPRIV_EXIT_PRIVERR,
+ _("write failed: %s"), "/proc/self/attr/exec");
+}
+
+int main(int argc, char **argv)
+{
+ enum {
+ NNP = CHAR_MAX + 1,
+ RUID,
+ EUID,
+ RGID,
+ EGID,
+ REUID,
+ REGID,
+ CLEAR_GROUPS,
+ KEEP_GROUPS,
+ GROUPS,
+ INHCAPS,
+ LISTCAPS,
+ CAPBSET,
+ SECUREBITS,
+ SELINUX_LABEL,
+ APPARMOR_PROFILE
+ };
+
+ static const struct option longopts[] = {
+ {"dump", no_argument, 0, 'd'},
+ {"nnp", no_argument, 0, NNP},
+ {"no-new-privs", no_argument, 0, NNP},
+ {"inh-caps", required_argument, 0, INHCAPS},
+ {"list-caps", no_argument, 0, LISTCAPS},
+ {"ruid", required_argument, 0, RUID},
+ {"euid", required_argument, 0, EUID},
+ {"rgid", required_argument, 0, RGID},
+ {"egid", required_argument, 0, EGID},
+ {"reuid", required_argument, 0, REUID},
+ {"regid", required_argument, 0, REGID},
+ {"clear-groups", no_argument, 0, CLEAR_GROUPS},
+ {"keep-groups", no_argument, 0, KEEP_GROUPS},
+ {"groups", required_argument, 0, GROUPS},
+ {"bounding-set", required_argument, 0, CAPBSET},
+ {"securebits", required_argument, 0, SECUREBITS},
+ {"selinux-label", required_argument, 0, SELINUX_LABEL},
+ {"apparmor-profile", required_argument, 0, APPARMOR_PROFILE},
+ {"help", no_argument, 0, 'h'},
+ {"version", no_argument, 0, 'V'},
+ {NULL, 0, 0, 0}
+ };
+
+ static const ul_excl_t excl[] = {
+ /* keep in same order with enum definitions */
+ {CLEAR_GROUPS, KEEP_GROUPS, GROUPS},
+ {0}
+ };
+ int excl_st[ARRAY_SIZE(excl)] = UL_EXCL_STATUS_INIT;
+
+ int c;
+ struct privctx opts;
+ int dumplevel = 0;
+ int total_opts = 0;
+ int list_caps = 0;
+
+ setlocale(LC_MESSAGES, "");
+ bindtextdomain(PACKAGE, LOCALEDIR);
+ textdomain(PACKAGE);
+ atexit(close_stdout);
+
+ memset(&opts, 0, sizeof(opts));
+
+ while ((c = getopt_long(argc, argv, "+dhV", longopts, NULL)) != -1) {
+ err_exclusive_options(c, longopts, excl, excl_st);
+ total_opts++;
+ switch (c) {
+ case 'd':
+ dumplevel++;
+ break;
+ case NNP:
+ if (opts.nnp)
+ errx(EXIT_FAILURE,
+ _("duplicate --no-new-privs option"));
+ opts.nnp = 1;
+ break;
+ case RUID:
+ if (opts.have_ruid)
+ errx(EXIT_FAILURE, _("duplicate ruid"));
+ opts.have_ruid = 1;
+ opts.ruid = strtol_or_err(optarg,
+ _("failed to parse ruid"));
+ break;
+ case EUID:
+ if (opts.have_euid)
+ errx(EXIT_FAILURE, _("duplicate euid"));
+ opts.have_euid = 1;
+ opts.euid = strtol_or_err(optarg,
+ _("failed to parse euid"));
+ break;
+ case REUID:
+ if (opts.have_ruid || opts.have_euid)
+ errx(EXIT_FAILURE, _("duplicate ruid or euid"));
+ opts.have_ruid = opts.have_euid = 1;
+ opts.ruid = opts.euid = strtol_or_err(optarg,
+ _("failed to parse reuid"));
+ break;
+ case RGID:
+ if (opts.have_rgid)
+ errx(EXIT_FAILURE, _("duplicate rgid"));
+ opts.have_rgid = 1;
+ opts.rgid = strtol_or_err(optarg,
+ _("failed to parse rgid"));
+ break;
+ case EGID:
+ if (opts.have_egid)
+ errx(EXIT_FAILURE, _("duplicate egid"));
+ opts.have_egid = 1;
+ opts.egid = strtol_or_err(optarg,
+ _("failed to parse egid"));
+ break;
+ case REGID:
+ if (opts.have_rgid || opts.have_egid)
+ errx(EXIT_FAILURE, _("duplicate rgid or egid"));
+ opts.have_rgid = opts.have_egid = 1;
+ opts.rgid = opts.egid = strtol_or_err(optarg,
+ _("failed to parse regid"));
+ break;
+ case CLEAR_GROUPS:
+ if (opts.clear_groups)
+ errx(EXIT_FAILURE,
+ _("duplicate --clear-groups option"));
+ opts.clear_groups = 1;
+ break;
+ case KEEP_GROUPS:
+ if (opts.keep_groups)
+ errx(EXIT_FAILURE,
+ _("duplicate --keep-groups option"));
+ opts.keep_groups = 1;
+ break;
+ case GROUPS:
+ if (opts.have_groups)
+ errx(EXIT_FAILURE,
+ _("duplicate --groups option"));
+ parse_groups(&opts, optarg);
+ break;
+ case LISTCAPS:
+ list_caps = 1;
+ break;
+ case INHCAPS:
+ if (opts.caps_to_inherit)
+ errx(EXIT_FAILURE,
+ _("duplicate --caps option"));
+ opts.caps_to_inherit = optarg;
+ break;
+ case CAPBSET:
+ if (opts.bounding_set)
+ errx(EXIT_FAILURE,
+ _("duplicate --bounding-set option"));
+ opts.bounding_set = optarg;
+ break;
+ case SECUREBITS:
+ if (opts.have_securebits)
+ errx(EXIT_FAILURE,
+ _("duplicate --securebits option"));
+ parse_securebits(&opts, optarg);
+ break;
+ case SELINUX_LABEL:
+ if (opts.selinux_label)
+ errx(EXIT_FAILURE,
+ _("duplicate --selinux-label option"));
+ opts.selinux_label = optarg;
+ break;
+ case APPARMOR_PROFILE:
+ if (opts.apparmor_profile)
+ errx(EXIT_FAILURE,
+ _("duplicate --apparmor-profile option"));
+ opts.apparmor_profile = optarg;
+ break;
+ case 'h':
+ usage(stdout);
+ case 'V':
+ printf(UTIL_LINUX_VERSION);
+ return EXIT_SUCCESS;
+ case '?':
+ usage(stderr);
+ default:
+ errx(EXIT_FAILURE, _("unrecognized option '%c'"), c);
+ }
+ }
+
+ if (dumplevel) {
+ if (total_opts != dumplevel || optind < argc)
+ errx(EXIT_FAILURE,
+ _("--dump is incompatible with all other options"));
+ dump(dumplevel);
+ return EXIT_SUCCESS;
+ }
+
+ if (list_caps) {
+ if (total_opts != 1 || optind < argc)
+ errx(EXIT_FAILURE,
+ _("--list-caps must be specified alone"));
+ list_known_caps();
+ return EXIT_SUCCESS;
+ }
+
+ if (argc <= optind)
+ errx(EXIT_FAILURE, _("No program specified"));
+
+ if ((opts.have_rgid || opts.have_egid)
+ && !opts.keep_groups && !opts.clear_groups && !opts.have_groups)
+ errx(EXIT_FAILURE,
+ _("--[re]gid requires --keep-groups, --clear-groups, or --groups"));
+
+ if (opts.nnp)
+ if (prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0) == -1)
+ err(EXIT_FAILURE, _("disallow granting new privileges failed"));
+
+ if (opts.selinux_label)
+ do_selinux_label(opts.selinux_label);
+ if (opts.apparmor_profile)
+ do_apparmor_profile(opts.apparmor_profile);
+
+ if (prctl(PR_SET_KEEPCAPS, 1, 0, 0, 0) == -1)
+ err(EXIT_FAILURE, _("keep process capabilities failed"));
+
+ /* We're going to want CAP_SETPCAP, CAP_SETUID, and CAP_SETGID if
+ * possible. */
+ bump_cap(CAP_SETPCAP);
+ bump_cap(CAP_SETUID);
+ bump_cap(CAP_SETGID);
+ if (capng_apply(CAPNG_SELECT_CAPS) != 0)
+ err(SETPRIV_EXIT_PRIVERR, _("activate capabilities"));
+
+ if (opts.have_ruid || opts.have_euid) {
+ do_setresuid(&opts);
+ /* KEEPCAPS doesn't work for the effective mask. */
+ if (capng_apply(CAPNG_SELECT_CAPS) != 0)
+ err(SETPRIV_EXIT_PRIVERR, _("reactivate capabilities"));
+ }
+
+ if (opts.have_rgid || opts.have_egid)
+ do_setresgid(&opts);
+
+ if (opts.have_groups) {
+ if (setgroups(opts.num_groups, opts.groups) != 0)
+ err(SETPRIV_EXIT_PRIVERR, _("setgroups failed"));
+ } else if (opts.clear_groups) {
+ gid_t x = 0;
+ if (setgroups(0, &x) != 0)
+ err(SETPRIV_EXIT_PRIVERR, _("setgroups failed"));
+ }
+
+ if (opts.have_securebits)
+ if (prctl(PR_SET_SECUREBITS, opts.securebits, 0, 0, 0) != 0)
+ err(SETPRIV_EXIT_PRIVERR, _("set procecess securebits failed"));
+
+ if (opts.bounding_set) {
+ do_caps(CAPNG_BOUNDING_SET, opts.bounding_set);
+ errno = EPERM; /* capng doesn't set errno if we're missing CAP_SETPCAP */
+ if (capng_apply(CAPNG_SELECT_BOUNDS) != 0)
+ err(SETPRIV_EXIT_PRIVERR, _("apply bounding set"));
+ }
+
+ if (opts.caps_to_inherit) {
+ do_caps(CAPNG_INHERITABLE, opts.caps_to_inherit);
+ if (capng_apply(CAPNG_SELECT_CAPS) != 0)
+ err(SETPRIV_EXIT_PRIVERR, _("apply capabilities"));
+ }
+
+ execvp(argv[optind], argv + optind);
+
+ err(EXIT_FAILURE, _("cannot execute: %s"), argv[optind]);
+}
projects / thirdparty / util-linux.git / commitdiff
