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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 14:30:35 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 14:30:35 +0000
commit378c18e5f024ac5a8aef4cb40d7c9aa9633d144c (patch)
tree44dfb6ca500d32cabd450649b322a42e70a30683 /sys-utils/setpriv.c
parentInitial commit. (diff)
downloadutil-linux-378c18e5f024ac5a8aef4cb40d7c9aa9633d144c.tar.xz
util-linux-378c18e5f024ac5a8aef4cb40d7c9aa9633d144c.zip
Adding upstream version 2.38.1.upstream/2.38.1upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'sys-utils/setpriv.c')
-rw-r--r--sys-utils/setpriv.c1061
1 files changed, 1061 insertions, 0 deletions
diff --git a/sys-utils/setpriv.c b/sys-utils/setpriv.c
new file mode 100644
index 0000000..ddc2cc6
--- /dev/null
+++ b/sys-utils/setpriv.c
@@ -0,0 +1,1061 @@
+/*
+ * 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 <pwd.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/prctl.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include "c.h"
+#include "caputils.h"
+#include "closestream.h"
+#include "nls.h"
+#include "optutils.h"
+#include "strutils.h"
+#include "xalloc.h"
+#include "pathnames.h"
+#include "signames.h"
+#include "env.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 */
+
+/* The shell to set SHELL env.variable if none is given in the user's passwd entry. */
+#define DEFAULT_SHELL "/bin/sh"
+
+static gid_t get_group(const char *s, const char *err);
+
+enum cap_type {
+ CAP_TYPE_EFFECTIVE = CAPNG_EFFECTIVE,
+ CAP_TYPE_PERMITTED = CAPNG_PERMITTED,
+ CAP_TYPE_INHERITABLE = CAPNG_INHERITABLE,
+ CAP_TYPE_BOUNDING = CAPNG_BOUNDING_SET,
+ CAP_TYPE_AMBIENT = (1 << 4)
+};
+
+/*
+ * 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 {
+ 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_passwd:1, /* passwd entry */
+ have_groups:1, /* add groups */
+ keep_groups:1, /* keep groups */
+ clear_groups:1, /* remove groups */
+ init_groups:1, /* initialize groups */
+ reset_env:1, /* reset environment */
+ have_securebits:1; /* remove groups */
+
+ /* uids and gids */
+ uid_t ruid, euid;
+ gid_t rgid, egid;
+
+ /* real user passwd entry */
+ struct passwd passwd;
+
+ /* supplementary groups */
+ size_t num_groups;
+ gid_t *groups;
+
+ /* caps */
+ const char *caps_to_inherit;
+ const char *ambient_caps;
+ const char *bounding_set;
+
+ /* securebits */
+ int securebits;
+ /* parent death signal (<0 clear, 0 nothing, >0 signal) */
+ int pdeathsig;
+
+ /* LSMs */
+ const char *selinux_label;
+ const char *apparmor_profile;
+};
+
+static void __attribute__((__noreturn__)) usage(void)
+{
+ FILE *out = stdout;
+ fputs(USAGE_HEADER, out);
+ fprintf(out, _(" %s [options] <program> [<argument>...]\n"),
+ program_invocation_short_name);
+
+ fputs(USAGE_SEPARATOR, out);
+ fputs(_("Run a program with different privilege settings.\n"), out);
+
+ fputs(USAGE_OPTIONS, out);
+ fputs(_(" -d, --dump show current state (and do not exec)\n"), out);
+ fputs(_(" --nnp, --no-new-privs disallow granting new privileges\n"), out);
+ fputs(_(" --ambient-caps <caps,...> set ambient capabilities\n"), out);
+ fputs(_(" --inh-caps <caps,...> set inheritable capabilities\n"), out);
+ fputs(_(" --bounding-set <caps> set capability bounding set\n"), out);
+ fputs(_(" --ruid <uid|user> set real uid\n"), out);
+ fputs(_(" --euid <uid|user> set effective uid\n"), out);
+ fputs(_(" --rgid <gid|user> set real gid\n"), out);
+ fputs(_(" --egid <gid|group> set effective gid\n"), out);
+ fputs(_(" --reuid <uid|user> set real and effective uid\n"), out);
+ fputs(_(" --regid <gid|group> set real and effective gid\n"), out);
+ fputs(_(" --clear-groups clear supplementary groups\n"), out);
+ fputs(_(" --keep-groups keep supplementary groups\n"), out);
+ fputs(_(" --init-groups initialize supplementary groups\n"), out);
+ fputs(_(" --groups <group,...> set supplementary groups by UID or name\n"), out);
+ fputs(_(" --securebits <bits> set securebits\n"), out);
+ fputs(_(" --pdeathsig keep|clear|<signame>\n"
+ " set or clear parent death signal\n"), out);
+ fputs(_(" --selinux-label <label> set SELinux label\n"), out);
+ fputs(_(" --apparmor-profile <pr> set AppArmor profile\n"), out);
+ fputs(_(" --reset-env clear all environment and initialize\n"
+ " HOME, SHELL, USER, LOGNAME and PATH\n"), out);
+
+ fputs(USAGE_SEPARATOR, out);
+ printf(USAGE_HELP_OPTIONS(29));
+ fputs(USAGE_SEPARATOR, out);
+ fputs(_(" This tool can be dangerous. Read the manpage, and be careful.\n"), out);
+ printf(USAGE_MAN_TAIL("setpriv(1)"));
+
+ exit(EXIT_SUCCESS);
+}
+
+static int has_cap(enum cap_type which, unsigned int i)
+{
+ switch (which) {
+ case CAP_TYPE_EFFECTIVE:
+ case CAP_TYPE_BOUNDING:
+ case CAP_TYPE_INHERITABLE:
+ case CAP_TYPE_PERMITTED:
+ return capng_have_capability((capng_type_t)which, i);
+ case CAP_TYPE_AMBIENT:
+ return prctl(PR_CAP_AMBIENT, PR_CAP_AMBIENT_IS_SET,
+ (unsigned long) i, 0UL, 0UL);
+ default:
+ warnx(_("invalid capability type"));
+ return -1;
+ }
+}
+
+/* Returns the number of capabilities printed. */
+static int print_caps(FILE *f, enum cap_type which)
+{
+ int i, n = 0, max = cap_last_cap();
+
+ for (i = 0; i <= max; i++) {
+ int ret = has_cap(which, i);
+
+ if (i == 0 && ret < 0)
+ return -1;
+
+ if (ret == 1) {
+ const char *name = capng_capability_to_name(i);
+ if (n)
+ fputc(',', f);
+ if (name)
+ fputs(name, f);
+ else
+ warnx(_("cap %d: libcap-ng is broken"), i);
+ n++;
+ }
+ }
+
+ return n;
+}
+
+static void dump_one_secbit(int *first, int *bits, int bit, const char *name)
+{
+ if (*bits & bit) {
+ if (*first)
+ *first = 0;
+ else
+ printf(",");
+ 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)
+ first = 0;
+ else
+ printf(",");
+ 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(_PATH_PROC_ATTR_CURRENT, O_RDONLY);
+ if (fd == -1) {
+ warn(_("cannot open %s"), _PATH_PROC_ATTR_CURRENT);
+ return;
+ }
+
+ len = read(fd, buf, sizeof(buf));
+ e = errno;
+ close(fd);
+ if (len < 0) {
+ errno = e;
+ warn(_("cannot read %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, NULL);
+ gid_t *groups;
+
+ if (n < 0) {
+ warn("getgroups failed");
+ return;
+ }
+
+ groups = xmalloc(n * sizeof(gid_t));
+ n = getgroups(n, groups);
+ if (n < 0) {
+ free(groups);
+ 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");
+ free(groups);
+}
+
+static void dump_pdeathsig(void)
+{
+ int pdeathsig;
+
+ if (prctl(PR_GET_PDEATHSIG, &pdeathsig) != 0) {
+ warn(_("get pdeathsig failed"));
+ return;
+ }
+
+ printf(_("Parent death signal: "));
+ if (pdeathsig && signum_to_signame(pdeathsig) != NULL)
+ printf("%s\n", signum_to_signame(pdeathsig));
+ else if (pdeathsig)
+ printf("%d\n", pdeathsig);
+ else
+ printf(_("[none]\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, CAP_TYPE_EFFECTIVE) == 0)
+ printf(_("[none]"));
+ printf("\n");
+
+ printf(_("Permitted capabilities: "));
+ if (print_caps(stdout, CAP_TYPE_PERMITTED) == 0)
+ printf(_("[none]"));
+ printf("\n");
+ }
+
+ printf(_("Inheritable capabilities: "));
+ if (print_caps(stdout, CAP_TYPE_INHERITABLE) == 0)
+ printf(_("[none]"));
+ printf("\n");
+
+ printf(_("Ambient capabilities: "));
+ x = print_caps(stdout, CAP_TYPE_AMBIENT);
+ if (x == 0)
+ printf(_("[none]"));
+ if (x < 0)
+ printf(_("[unsupported]"));
+ printf("\n");
+
+ printf(_("Capability bounding set: "));
+ if (print_caps(stdout, CAP_TYPE_BOUNDING) == 0)
+ printf(_("[none]"));
+ printf("\n");
+
+ dump_securebits();
+ dump_pdeathsig();
+
+ if (access(_PATH_SYS_SELINUX, F_OK) == 0)
+ dump_label(_("SELinux label"));
+
+ if (access(_PATH_SYS_APPARMOR, F_OK) == 0) {
+ dump_label(_("AppArmor profile"));
+ }
+}
+
+static void list_known_caps(void)
+{
+ int i, max = 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++] = get_group(c, _("Invalid supplementary group id"));
+
+ free(groups);
+}
+
+static void parse_pdeathsig(struct privctx *opts, const char *str)
+{
+ if (!strcmp(str, "keep")) {
+ if (prctl(PR_GET_PDEATHSIG, &opts->pdeathsig) != 0)
+ errx(SETPRIV_EXIT_PRIVERR,
+ _("failed to get parent death signal"));
+ } else if (!strcmp(str, "clear")) {
+ opts->pdeathsig = -1;
+ } else if ((opts->pdeathsig = signame_to_signum(str)) < 0) {
+ errx(EXIT_FAILURE, _("unknown signal: %s"), str);
+ }
+}
+
+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 int cap_update(capng_act_t action,
+ enum cap_type type, unsigned int cap)
+{
+ switch (type) {
+ case CAP_TYPE_EFFECTIVE:
+ case CAP_TYPE_BOUNDING:
+ case CAP_TYPE_INHERITABLE:
+ case CAP_TYPE_PERMITTED:
+ return capng_update(action, (capng_type_t) type, cap);
+ case CAP_TYPE_AMBIENT:
+ {
+ int ret;
+
+ if (action == CAPNG_ADD)
+ ret = prctl(PR_CAP_AMBIENT, PR_CAP_AMBIENT_RAISE,
+ (unsigned long) cap, 0UL, 0UL);
+ else
+ ret = prctl(PR_CAP_AMBIENT, PR_CAP_AMBIENT_LOWER,
+ (unsigned long) cap, 0UL, 0UL);
+
+ return ret;
+ }
+ default:
+ errx(EXIT_FAILURE, _("unsupported capability type"));
+ return -1;
+ }
+}
+
+static void do_caps(enum cap_type 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;
+ /* We can trust the return value from cap_last_cap(),
+ * so use that directly. */
+ for (i = 0; i <= cap_last_cap(); i++)
+ cap_update(action, type, i);
+ } else {
+ int cap = capng_name_to_capability(c + 1);
+ if (0 <= cap)
+ cap_update(action, type, cap);
+ else if (sscanf(c + 1, "cap_%d", &cap) == 1
+ && 0 <= cap && cap <= cap_last_cap())
+ cap_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(_PATH_SYS_SELINUX, F_OK) != 0)
+ errx(SETPRIV_EXIT_PRIVERR, _("SELinux is not running"));
+
+ fd = open(_PATH_PROC_ATTR_EXEC, O_RDWR);
+ if (fd == -1)
+ err(SETPRIV_EXIT_PRIVERR,
+ _("cannot open %s"), _PATH_PROC_ATTR_EXEC);
+
+ len = strlen(label);
+ errno = 0;
+ if (write(fd, label, len) != (ssize_t) len)
+ err(SETPRIV_EXIT_PRIVERR,
+ _("write failed: %s"), _PATH_PROC_ATTR_EXEC);
+
+ if (close(fd) != 0)
+ err(SETPRIV_EXIT_PRIVERR,
+ _("close failed: %s"), _PATH_PROC_ATTR_EXEC);
+}
+
+static void do_apparmor_profile(const char *label)
+{
+ FILE *f;
+
+ if (access(_PATH_SYS_APPARMOR, F_OK) != 0)
+ errx(SETPRIV_EXIT_PRIVERR, _("AppArmor is not running"));
+
+ f = fopen(_PATH_PROC_ATTR_EXEC, "r+");
+ if (!f)
+ err(SETPRIV_EXIT_PRIVERR,
+ _("cannot open %s"), _PATH_PROC_ATTR_EXEC);
+
+ fprintf(f, "exec %s", label);
+
+ if (close_stream(f) != 0)
+ err(SETPRIV_EXIT_PRIVERR,
+ _("write failed: %s"), _PATH_PROC_ATTR_EXEC);
+}
+
+
+static void do_reset_environ(struct passwd *pw)
+{
+ char *term = getenv("TERM");
+
+ if (term)
+ term = xstrdup(term);
+#ifdef HAVE_CLEARENV
+ clearenv();
+#else
+ environ = NULL;
+#endif
+ if (term) {
+ xsetenv("TERM", term, 1);
+ free(term);
+ }
+
+ if (pw->pw_shell && *pw->pw_shell)
+ xsetenv("SHELL", pw->pw_shell, 1);
+ else
+ xsetenv("SHELL", DEFAULT_SHELL, 1);
+
+ xsetenv("HOME", pw->pw_dir, 1);
+ xsetenv("USER", pw->pw_name, 1);
+ xsetenv("LOGNAME", pw->pw_name, 1);
+
+ if (pw->pw_uid)
+ xsetenv("PATH", _PATH_DEFPATH, 1);
+ else
+ xsetenv("PATH", _PATH_DEFPATH_ROOT, 1);
+}
+
+static uid_t get_user(const char *s, const char *err)
+{
+ struct passwd *pw;
+ long tmp;
+ pw = getpwnam(s);
+ if (pw)
+ return pw->pw_uid;
+ tmp = strtol_or_err(s, err);
+ return tmp;
+}
+
+static gid_t get_group(const char *s, const char *err)
+{
+ struct group *gr;
+ long tmp;
+ gr = getgrnam(s);
+ if (gr)
+ return gr->gr_gid;
+ tmp = strtol_or_err(s, err);
+ return tmp;
+}
+
+static struct passwd *get_passwd(const char *s, uid_t *uid, const char *err)
+{
+ struct passwd *pw;
+ long tmp;
+ pw = getpwnam(s);
+ if (pw) {
+ *uid = pw->pw_uid;
+ } else {
+ tmp = strtol_or_err(s, err);
+ *uid = tmp;
+ pw = getpwuid(*uid);
+ }
+ return pw;
+}
+
+static struct passwd *passwd_copy(struct passwd *dst, const struct passwd *src)
+{
+ struct passwd *rv;
+ rv = memcpy(dst, src, sizeof(*dst));
+ rv->pw_name = xstrdup(rv->pw_name);
+ rv->pw_passwd = xstrdup(rv->pw_passwd);
+ rv->pw_gecos = xstrdup(rv->pw_gecos);
+ rv->pw_dir = xstrdup(rv->pw_dir);
+ rv->pw_shell = xstrdup(rv->pw_shell);
+ return rv;
+}
+
+int main(int argc, char **argv)
+{
+ enum {
+ NNP = CHAR_MAX + 1,
+ RUID,
+ EUID,
+ RGID,
+ EGID,
+ REUID,
+ REGID,
+ CLEAR_GROUPS,
+ KEEP_GROUPS,
+ INIT_GROUPS,
+ GROUPS,
+ INHCAPS,
+ AMBCAPS,
+ LISTCAPS,
+ CAPBSET,
+ SECUREBITS,
+ PDEATHSIG,
+ SELINUX_LABEL,
+ APPARMOR_PROFILE,
+ RESET_ENV
+ };
+
+ static const struct option longopts[] = {
+ { "dump", no_argument, NULL, 'd' },
+ { "nnp", no_argument, NULL, NNP },
+ { "no-new-privs", no_argument, NULL, NNP },
+ { "inh-caps", required_argument, NULL, INHCAPS },
+ { "ambient-caps", required_argument, NULL, AMBCAPS },
+ { "list-caps", no_argument, NULL, LISTCAPS },
+ { "ruid", required_argument, NULL, RUID },
+ { "euid", required_argument, NULL, EUID },
+ { "rgid", required_argument, NULL, RGID },
+ { "egid", required_argument, NULL, EGID },
+ { "reuid", required_argument, NULL, REUID },
+ { "regid", required_argument, NULL, REGID },
+ { "clear-groups", no_argument, NULL, CLEAR_GROUPS },
+ { "keep-groups", no_argument, NULL, KEEP_GROUPS },
+ { "init-groups", no_argument, NULL, INIT_GROUPS },
+ { "groups", required_argument, NULL, GROUPS },
+ { "bounding-set", required_argument, NULL, CAPBSET },
+ { "securebits", required_argument, NULL, SECUREBITS },
+ { "pdeathsig", required_argument, NULL, PDEATHSIG, },
+ { "selinux-label", required_argument, NULL, SELINUX_LABEL },
+ { "apparmor-profile", required_argument, NULL, APPARMOR_PROFILE },
+ { "help", no_argument, NULL, 'h' },
+ { "reset-env", no_argument, NULL, RESET_ENV, },
+ { "version", no_argument, NULL, 'V' },
+ { NULL, 0, NULL, 0 }
+ };
+
+ static const ul_excl_t excl[] = {
+ /* keep in same order with enum definitions */
+ {CLEAR_GROUPS, KEEP_GROUPS, INIT_GROUPS, GROUPS},
+ {0}
+ };
+ int excl_st[ARRAY_SIZE(excl)] = UL_EXCL_STATUS_INIT;
+
+ int c;
+ struct privctx opts;
+ struct passwd *pw = NULL;
+ int dumplevel = 0;
+ int total_opts = 0;
+ int list_caps = 0;
+
+ setlocale(LC_ALL, "");
+ bindtextdomain(PACKAGE, LOCALEDIR);
+ textdomain(PACKAGE);
+ close_stdout_atexit();
+
+ 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;
+ pw = get_passwd(optarg, &opts.ruid, _("failed to parse ruid"));
+ if (pw) {
+ passwd_copy(&opts.passwd, pw);
+ opts.have_passwd = 1;
+ }
+ break;
+ case EUID:
+ if (opts.have_euid)
+ errx(EXIT_FAILURE, _("duplicate euid"));
+ opts.have_euid = 1;
+ opts.euid = get_user(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;
+ pw = get_passwd(optarg, &opts.ruid, _("failed to parse reuid"));
+ opts.euid = opts.ruid;
+ if (pw) {
+ passwd_copy(&opts.passwd, pw);
+ opts.have_passwd = 1;
+ }
+ break;
+ case RGID:
+ if (opts.have_rgid)
+ errx(EXIT_FAILURE, _("duplicate rgid"));
+ opts.have_rgid = 1;
+ opts.rgid = get_group(optarg, _("failed to parse rgid"));
+ break;
+ case EGID:
+ if (opts.have_egid)
+ errx(EXIT_FAILURE, _("duplicate egid"));
+ opts.have_egid = 1;
+ opts.egid = get_group(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 = get_group(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 INIT_GROUPS:
+ if (opts.init_groups)
+ errx(EXIT_FAILURE,
+ _("duplicate --init-groups option"));
+ opts.init_groups = 1;
+ break;
+ case GROUPS:
+ if (opts.have_groups)
+ errx(EXIT_FAILURE,
+ _("duplicate --groups option"));
+ parse_groups(&opts, optarg);
+ break;
+ case PDEATHSIG:
+ if (opts.pdeathsig)
+ errx(EXIT_FAILURE,
+ _("duplicate --keep-pdeathsig option"));
+ parse_pdeathsig(&opts, optarg);
+ break;
+ case LISTCAPS:
+ list_caps = 1;
+ break;
+ case INHCAPS:
+ if (opts.caps_to_inherit)
+ errx(EXIT_FAILURE,
+ _("duplicate --inh-caps option"));
+ opts.caps_to_inherit = optarg;
+ break;
+ case AMBCAPS:
+ if (opts.ambient_caps)
+ errx(EXIT_FAILURE,
+ _("duplicate --ambient-caps option"));
+ opts.ambient_caps = 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 RESET_ENV:
+ opts.reset_env = 1;
+ break;
+
+ case 'h':
+ usage();
+ case 'V':
+ print_version(EXIT_SUCCESS);
+ default:
+ errtryhelp(EXIT_FAILURE);
+ }
+ }
+
+ 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.init_groups
+ && !opts.have_groups)
+ errx(EXIT_FAILURE,
+ _("--[re]gid requires --keep-groups, --clear-groups, --init-groups, or --groups"));
+
+ if (opts.init_groups && !opts.have_ruid)
+ errx(EXIT_FAILURE,
+ _("--init-groups requires --ruid or --reuid"));
+
+ if (opts.init_groups && !opts.have_passwd)
+ errx(EXIT_FAILURE,
+ _("uid %ld not found, --init-groups requires an user that "
+ "can be found on the system"),
+ (long) opts.ruid);
+
+ if (opts.reset_env) {
+ if (opts.have_passwd)
+ /* pwd according to --ruid or --reuid */
+ pw = &opts.passwd;
+ else
+ /* pwd for the current user */
+ pw = getpwuid(getuid());
+ do_reset_environ(pw);
+ }
+
+ if (opts.nnp && 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.init_groups) {
+ if (initgroups(opts.passwd.pw_name, opts.passwd.pw_gid) != 0)
+ err(SETPRIV_EXIT_PRIVERR, _("initgroups 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 && prctl(PR_SET_SECUREBITS, opts.securebits, 0, 0, 0) != 0)
+ err(SETPRIV_EXIT_PRIVERR, _("set process securebits failed"));
+
+ if (opts.bounding_set) {
+ do_caps(CAP_TYPE_BOUNDING, 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(CAP_TYPE_INHERITABLE, opts.caps_to_inherit);
+ if (capng_apply(CAPNG_SELECT_CAPS) != 0)
+ err(SETPRIV_EXIT_PRIVERR, _("apply capabilities"));
+ }
+
+ if (opts.ambient_caps) {
+ do_caps(CAP_TYPE_AMBIENT, opts.ambient_caps);
+ }
+
+ /* Clear or set parent death signal */
+ if (opts.pdeathsig && prctl(PR_SET_PDEATHSIG, opts.pdeathsig < 0 ? 0 : opts.pdeathsig) != 0)
+ err(SETPRIV_EXIT_PRIVERR, _("set parent death signal failed"));
+
+ execvp(argv[optind], argv + optind);
+ errexec(argv[optind]);
+}