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From e6dea148252c9d8cb3de0965f2e558ac13e12f06 Mon Sep 17 00:00:00 2001
From: Daniel Shahaf <danielsh@apache.org>
Date: Thu, 26 Dec 2019 11:49:45 +0000
Subject: [PATCH 1/7] internal: Allow %L in zerrmsg() in non-debug builds, too.
This will let error messages include long integers.
Upstream-commit: 81185f4c6106d7ea2f7beaabbec7360c08e400d2
Signed-off-by: Kamil Dudka <kdudka@redhat.com>
---
Src/utils.c | 2 --
1 file changed, 2 deletions(-)
diff --git a/Src/utils.c b/Src/utils.c
index 32f6008..2ddc596 100644
--- a/Src/utils.c
+++ b/Src/utils.c
@@ -325,12 +325,10 @@ zerrmsg(FILE *file, const char *fmt, va_list ap)
nicezputs(s, file);
break;
}
-#ifdef DEBUG
case 'L':
lnum = va_arg(ap, long);
fprintf(file, "%ld", lnum);
break;
-#endif
case 'd':
num = va_arg(ap, int);
fprintf(file, "%d", num);
--
2.21.1
From 4907caaf15e5a054088e05534c5500679c15b105 Mon Sep 17 00:00:00 2001
From: dana <dana@dana.is>
Date: Thu, 26 Dec 2019 14:57:07 -0600
Subject: [PATCH 2/7] unposted: zerrmsg(): Fix macro guard missed in previous
commit
Upstream-commit: ed21a7b70068b4250a25dcdc5b7213a789b0d0ca
Signed-off-by: Kamil Dudka <kdudka@redhat.com>
---
Src/utils.c | 2 --
1 file changed, 2 deletions(-)
diff --git a/Src/utils.c b/Src/utils.c
index 2ddc596..4a1dcc4 100644
--- a/Src/utils.c
+++ b/Src/utils.c
@@ -287,9 +287,7 @@ zerrmsg(FILE *file, const char *fmt, va_list ap)
{
const char *str;
int num;
-#ifdef DEBUG
long lnum;
-#endif
#ifdef HAVE_STRERROR_R
#define ERRBUFSIZE (80)
int olderrno;
--
2.21.1
From a6763e5de6eebc5994097fc4d778094e7254589c Mon Sep 17 00:00:00 2001
From: Sam Foxman <samfoxman320@gmail.com>
Date: Sun, 22 Dec 2019 17:30:28 -0500
Subject: [PATCH 3/7] Drop privileges securely
Upstream-commit: 24e993db62cf146fb76ebcf677a4a7aa3766fc74
Signed-off-by: Kamil Dudka <kdudka@redhat.com>
---
Src/options.c | 146 +++++++++++++++++++++++++++++++++++++++++---------
configure.ac | 4 +-
2 files changed, 125 insertions(+), 25 deletions(-)
diff --git a/Src/options.c b/Src/options.c
index 590652e..c9608af 100644
--- a/Src/options.c
+++ b/Src/options.c
@@ -576,6 +576,7 @@ int
bin_setopt(char *nam, char **args, UNUSED(Options ops), int isun)
{
int action, optno, match = 0;
+ int retval = 0;
/* With no arguments or options, display options. */
if (!*args) {
@@ -603,18 +604,28 @@ bin_setopt(char *nam, char **args, UNUSED(Options ops), int isun)
inittyptab();
return 1;
}
- if(!(optno = optlookup(*args)))
+ if(!(optno = optlookup(*args))) {
zwarnnam(nam, "no such option: %s", *args);
- else if(dosetopt(optno, action, 0, opts))
- zwarnnam(nam, "can't change option: %s", *args);
+ retval = 1;
+ } else {
+ retval = !!dosetopt(optno, action, 0, opts);
+ if (retval) {
+ zwarnnam(nam, "can't change option: %s", *args);
+ }
+ }
break;
} else if(**args == 'm') {
match = 1;
} else {
- if (!(optno = optlookupc(**args)))
+ if (!(optno = optlookupc(**args))) {
zwarnnam(nam, "bad option: -%c", **args);
- else if(dosetopt(optno, action, 0, opts))
- zwarnnam(nam, "can't change option: -%c", **args);
+ retval = 1;
+ } else {
+ retval = !!dosetopt(optno, action, 0, opts);
+ if (retval) {
+ zwarnnam(nam, "can't change option: -%c", **args);
+ }
+ }
}
}
args++;
@@ -624,10 +635,15 @@ bin_setopt(char *nam, char **args, UNUSED(Options ops), int isun)
if (!match) {
/* Not globbing the arguments -- arguments are simply option names. */
while (*args) {
- if(!(optno = optlookup(*args++)))
+ if(!(optno = optlookup(*args++))) {
zwarnnam(nam, "no such option: %s", args[-1]);
- else if(dosetopt(optno, !isun, 0, opts))
- zwarnnam(nam, "can't change option: %s", args[-1]);
+ retval = 1;
+ } else {
+ retval = !!dosetopt(optno, !isun, 0, opts);
+ if (retval) {
+ zwarnnam(nam, "can't change option: %s", args[-1]);
+ }
+ }
}
} else {
/* Globbing option (-m) set. */
@@ -650,7 +666,8 @@ bin_setopt(char *nam, char **args, UNUSED(Options ops), int isun)
tokenize(s);
if (!(pprog = patcompile(s, PAT_HEAPDUP, NULL))) {
zwarnnam(nam, "bad pattern: %s", *args);
- continue;
+ retval = 1;
+ break;
}
/* Loop over expansions. */
scanmatchtable(optiontab, pprog, 0, 0, OPT_ALIAS,
@@ -659,7 +676,7 @@ bin_setopt(char *nam, char **args, UNUSED(Options ops), int isun)
}
}
inittyptab();
- return 0;
+ return retval;
}
/* Identify an option name */
@@ -768,20 +785,101 @@ dosetopt(int optno, int value, int force, char *new_opts)
return -1;
} else if(optno == PRIVILEGED && !value) {
/* unsetting PRIVILEGED causes the shell to make itself unprivileged */
-#ifdef HAVE_SETUID
- setuid(getuid());
- setgid(getgid());
- if (setuid(getuid())) {
- zwarn("failed to change user ID: %e", errno);
- return -1;
- } else if (setgid(getgid())) {
- zwarn("failed to change group ID: %e", errno);
- return -1;
- }
+
+ int skip_setuid = 0;
+ int skip_setgid = 0;
+
+#if defined(HAVE_GETEGID) && defined(HAVE_SETGID) && defined(HAVE_GETUID)
+ int orig_egid = getegid();
+#endif
+
+#if defined(HAVE_GETEUID) && defined(HAVE_GETUID)
+ if (geteuid() == getuid()) {
+ skip_setuid = 1;
+ }
+#endif
+
+#if defined(HAVE_GETEGID) && defined(HAVE_GETGID)
+ if (getegid() == getgid()) {
+ skip_setgid = 1;
+ }
+#endif
+
+ if (!skip_setgid) {
+ int setgid_err;
+#ifdef HAVE_SETRESGID
+ setgid_err = setresgid(getgid(), getgid(), getgid());
+#elif defined(HAVE_SETREGID)
+#if defined(HAVE_GETEGID) && defined(HAVE_SETGID) && defined(HAVE_GETUID)
+ setgid_err = setregid(getgid(), getgid());
+#else
+ zwarnnam("unsetopt",
+ "PRIVILEGED: can't drop privileges; setregid available, but cannot check if saved gid changed");
+ return -1;
+#endif
+#else
+ zwarnnam("unsetopt", "PRIVILEGED: can't drop privileges; setresgid and setregid not available");
+ return -1;
+#endif
+ if (setgid_err) {
+ zwarnnam("unsetopt", "PRIVILEGED: can't drop privileges; failed to change group ID: %e", errno);
+ return -1;
+ }
+ }
+
+ if (!skip_setuid) {
+#if defined(HAVE_GETEUID) && defined(HAVE_SETUID)
+ int orig_euid = geteuid();
+#endif
+ int setuid_err;
+#if defined(HAVE_GETEUID) && defined(HAVE_INITGROUPS) && defined(HAVE_GETPWUID)
+ if (geteuid() == 0) {
+ struct passwd *pw = getpwuid(getuid());
+ if (pw == NULL) {
+ zwarnnam("unsetopt", "can't drop privileges; failed to get user information for uid %d: %e",
+ getuid(), errno);
+ return -1;
+ }
+ if (initgroups(pw->pw_name, pw->pw_gid)) {
+ zwarnnam("unsetopt", "can't drop privileges; failed to set supplementary group list: %e", errno);
+ return -1;
+ }
+ }
+#endif
+
+#ifdef HAVE_SETRESUID
+ setuid_err = setresuid(getuid(), getuid(), getuid());
+#elif defined(HAVE_SETREUID)
+#if defined(HAVE_GETEUID) && defined(HAVE_SETUID) && defined(HAVE_GETUID)
+ setuid_err = setreuid(getuid(), getuid());
+#else
+ zwarnnam("unsetopt",
+ "PRIVILEGED: can't drop privileges; setreuid available, but cannot check if saved uid changed");
+ return -1;
+#endif
#else
- zwarn("setuid not available");
- return -1;
-#endif /* not HAVE_SETUID */
+ zwarnnam("unsetopt", "PRIVILEGED: can't drop privileges; setresuid and setreuid not available");
+ return -1;
+#endif
+ if (setuid_err) {
+ zwarnnam("unsetopt", "PRIVILEGED: can't drop privileges; failed to change user ID: %e", errno);
+ return -1;
+ }
+#if defined(HAVE_GETEUID) && defined(HAVE_SETUID) && defined(HAVE_GETUID)
+ if (getuid() != 0 && !setuid(orig_euid)) {
+ zwarnnam("unsetopt", "PRIVILEGED: can't drop privileges; was able to restore the euid");
+ return -1;
+ }
+#endif
+ }
+
+#if defined(HAVE_GETEGID) && defined(HAVE_SETGID) && defined(HAVE_GETUID)
+ if (getuid() != 0 && !skip_setgid && !setgid(orig_egid)) {
+ zwarnnam("unsetopt", "PRIVILEGED: can't drop privileges; was able to restore the egid");
+ return -1;
+ }
+#endif
+
#ifdef JOB_CONTROL
} else if (!force && optno == MONITOR && value) {
if (new_opts[optno] == value)
diff --git a/configure.ac b/configure.ac
index d15a6cd..51cdf89 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1300,7 +1300,9 @@ AC_CHECK_FUNCS(strftime strptime mktime timelocal \
inet_aton inet_pton inet_ntop \
getlogin getpwent getpwnam getpwuid getgrgid getgrnam \
initgroups nis_list \
- setuid seteuid setreuid setresuid setsid \
+ getuid setuid seteuid setreuid setresuid setsid \
+ getgid setgid setegid setregid setresgid \
+ geteuid getegid \
memcpy memmove strstr strerror strtoul \
getrlimit getrusage \
setlocale \
--
2.21.1
From 07ec3e46db743ff37fd2bfeafbb4a44ddc7b4aaa Mon Sep 17 00:00:00 2001
From: Daniel Shahaf <danielsh@apache.org>
Date: Thu, 26 Dec 2019 09:16:19 +0000
Subject: [PATCH 4/7] Improve PRIVILEGED fixes
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
- Fix retval handling in bin_setopt()
- Don't skip_setuid / skip_setgid. It's not our place to optimize away noops
(that might not even _be_ noops; they might change the saved uid…).
- Remove HAVE_* guard checks around functions that are used unguarded elsewhere.
- Use bsd-setres_id.c from OpenSSH to provide setresuid() / setresgid()
everywhere, and thus simplify the ifdef soup. Fix some preëxisting
bugs in the macro definitions of setuid() (do we still need that one?).
- Fix zwarning() format codes for variadic arguments type safety
- Restored a comment from HEAD
- Fix failure modes around initgroups()
- Compared privilege restoration code with OpenSSH's permanently_drop_uid() and
updated as needed
- Add E01 PRIVILEGED sanity checks
Upstream-commit: 8250c5c168f07549ed646e6848e6dda118271e23
Signed-off-by: Kamil Dudka <kdudka@redhat.com>
---
Src/openssh_bsd_setres_id.c | 129 +++++++++++++++++++++++++++++++
Src/options.c | 148 ++++++++++++++++--------------------
Src/zsh.mdd | 3 +-
Src/zsh_system.h | 94 ++++++++++++++++++-----
Test/E01options.ztst | 15 ++++
configure.ac | 5 +-
6 files changed, 292 insertions(+), 102 deletions(-)
create mode 100644 Src/openssh_bsd_setres_id.c
diff --git a/Src/openssh_bsd_setres_id.c b/Src/openssh_bsd_setres_id.c
new file mode 100644
index 0000000..65e91a4
--- /dev/null
+++ b/Src/openssh_bsd_setres_id.c
@@ -0,0 +1,129 @@
+/*
+ * Copyright (c) 2012 Darren Tucker (dtucker at zip com au).
+ *
+ * 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.
+ */
+/*
+ * openssh_bsd_setres_id.c - setresuid() and setresgid() wrappers
+ *
+ * This file is part of zsh, the Z shell.
+ *
+ * It is based on the file openbsd-compat/bsd-setres_id.c in OpenSSH 7.9p1,
+ * which is subject to the copyright notice above. The zsh modifications are
+ * licensed as follows:
+ *
+ * Copyright (c) 2019 Daniel Shahaf
+ * All rights reserved.
+ *
+ * Permission is hereby granted, without written agreement and without
+ * license or royalty fees, to use, copy, modify, and distribute this
+ * software and to distribute modified versions of this software for any
+ * purpose, provided that the above copyright notice and the following
+ * two paragraphs appear in all copies of this software.
+ *
+ * In no event shall Daniel Shahaf or the Zsh Development Group be liable
+ * to any party for direct, indirect, special, incidental, or consequential
+ * damages arising out of the use of this software and its documentation,
+ * even if Daniel Shahaf and the Zsh Development Group have been advised of
+ * the possibility of such damage.
+ *
+ * Daniel Shahaf and the Zsh Development Group specifically disclaim any
+ * warranties, including, but not limited to, the implied warranties of
+ * merchantability and fitness for a particular purpose. The software
+ * provided hereunder is on an "as is" basis, and Daniel Shahaf and the
+ * Zsh Development Group have no obligation to provide maintenance,
+ * support, updates, enhancements, or modifications.
+ *
+ */
+
+
+#include <sys/types.h>
+
+#include <stdarg.h>
+#include <unistd.h>
+#include <string.h>
+
+#include "zsh.mdh"
+
+#if defined(ZSH_IMPLEMENT_SETRESGID) || defined(BROKEN_SETRESGID)
+int
+setresgid(gid_t rgid, gid_t egid, gid_t sgid)
+{
+ int ret = 0, saved_errno;
+
+ if (rgid != sgid) {
+ errno = ENOSYS;
+ return -1;
+ }
+#if defined(ZSH_HAVE_NATIVE_SETREGID) && !defined(BROKEN_SETREGID)
+ if (setregid(rgid, egid) < 0) {
+ saved_errno = errno;
+ zwarnnam("setregid", "to gid %L: %e", (long)rgid, errno);
+ errno = saved_errno;
+ ret = -1;
+ }
+#else
+ if (setegid(egid) < 0) {
+ saved_errno = errno;
+ zwarnnam("setegid", "to gid %L: %e", (long)(unsigned int)egid, errno);
+ errno = saved_errno;
+ ret = -1;
+ }
+ if (setgid(rgid) < 0) {
+ saved_errno = errno;
+ zwarnnam("setgid", "to gid %L: %e", (long)rgid, errno);
+ errno = saved_errno;
+ ret = -1;
+ }
+#endif
+ return ret;
+}
+#endif
+
+#if defined(ZSH_IMPLEMENT_SETRESUID) || defined(BROKEN_SETRESUID)
+int
+setresuid(uid_t ruid, uid_t euid, uid_t suid)
+{
+ int ret = 0, saved_errno;
+
+ if (ruid != suid) {
+ errno = ENOSYS;
+ return -1;
+ }
+#if defined(ZSH_HAVE_NATIVE_SETREUID) && !defined(BROKEN_SETREUID)
+ if (setreuid(ruid, euid) < 0) {
+ saved_errno = errno;
+ zwarnnam("setreuid", "to uid %L: %e", (long)ruid, errno);
+ errno = saved_errno;
+ ret = -1;
+ }
+#else
+
+# ifndef SETEUID_BREAKS_SETUID
+ if (seteuid(euid) < 0) {
+ saved_errno = errno;
+ zwarnnam("seteuid", "to uid %L: %e", (long)euid, errno);
+ errno = saved_errno;
+ ret = -1;
+ }
+# endif
+ if (setuid(ruid) < 0) {
+ saved_errno = errno;
+ zwarnnam("setuid", "to uid %L: %e", (long)ruid, errno);
+ errno = saved_errno;
+ ret = -1;
+ }
+#endif
+ return ret;
+}
+#endif
diff --git a/Src/options.c b/Src/options.c
index c9608af..deec560 100644
--- a/Src/options.c
+++ b/Src/options.c
@@ -606,25 +606,21 @@ bin_setopt(char *nam, char **args, UNUSED(Options ops), int isun)
}
if(!(optno = optlookup(*args))) {
zwarnnam(nam, "no such option: %s", *args);
- retval = 1;
- } else {
- retval = !!dosetopt(optno, action, 0, opts);
- if (retval) {
- zwarnnam(nam, "can't change option: %s", *args);
- }
+ retval |= 1;
+ } else if (dosetopt(optno, action, 0, opts)) {
+ zwarnnam(nam, "can't change option: %s", *args);
+ retval |= 1;
}
break;
} else if(**args == 'm') {
match = 1;
} else {
- if (!(optno = optlookupc(**args))) {
+ if (!(optno = optlookupc(**args))) {
zwarnnam(nam, "bad option: -%c", **args);
- retval = 1;
- } else {
- retval = !!dosetopt(optno, action, 0, opts);
- if (retval) {
- zwarnnam(nam, "can't change option: -%c", **args);
- }
+ retval |= 1;
+ } else if (dosetopt(optno, action, 0, opts)) {
+ zwarnnam(nam, "can't change option: -%c", **args);
+ retval |= 1;
}
}
}
@@ -637,12 +633,10 @@ bin_setopt(char *nam, char **args, UNUSED(Options ops), int isun)
while (*args) {
if(!(optno = optlookup(*args++))) {
zwarnnam(nam, "no such option: %s", args[-1]);
- retval = 1;
- } else {
- retval = !!dosetopt(optno, !isun, 0, opts);
- if (retval) {
- zwarnnam(nam, "can't change option: %s", args[-1]);
- }
+ retval |= 1;
+ } else if (dosetopt(optno, !isun, 0, opts)) {
+ zwarnnam(nam, "can't change option: %s", args[-1]);
+ retval |= 1;
}
}
} else {
@@ -666,7 +660,7 @@ bin_setopt(char *nam, char **args, UNUSED(Options ops), int isun)
tokenize(s);
if (!(pprog = patcompile(s, PAT_HEAPDUP, NULL))) {
zwarnnam(nam, "bad pattern: %s", *args);
- retval = 1;
+ retval |= 1;
break;
}
/* Loop over expansions. */
@@ -786,100 +780,92 @@ dosetopt(int optno, int value, int force, char *new_opts)
} else if(optno == PRIVILEGED && !value) {
/* unsetting PRIVILEGED causes the shell to make itself unprivileged */
- int skip_setuid = 0;
- int skip_setgid = 0;
-
-#if defined(HAVE_GETEGID) && defined(HAVE_SETGID) && defined(HAVE_GETUID)
- int orig_egid = getegid();
-#endif
+ /* If set, return -1 so lastval will be non-zero. */
+ int failed = 0;
-#if defined(HAVE_GETEUID) && defined(HAVE_GETUID)
- if (geteuid() == getuid()) {
- skip_setuid = 1;
- }
+#ifdef HAVE_SETUID
+ const int orig_euid = geteuid();
#endif
+ const int orig_egid = getegid();
-#if defined(HAVE_GETEGID) && defined(HAVE_GETGID)
- if (getegid() == getgid()) {
- skip_setgid = 1;
- }
-#endif
-
- if (!skip_setgid) {
- int setgid_err;
-#ifdef HAVE_SETRESGID
- setgid_err = setresgid(getgid(), getgid(), getgid());
-#elif defined(HAVE_SETREGID)
-#if defined(HAVE_GETEGID) && defined(HAVE_SETGID) && defined(HAVE_GETUID)
- setgid_err = setregid(getgid(), getgid());
-#else
- zwarnnam("unsetopt",
- "PRIVILEGED: can't drop privileges; setregid available, but cannot check if saved gid changed");
+ /*
+ * Set the GID first as if we set the UID to non-privileged it
+ * might be impossible to restore the GID.
+ */
+ {
+#ifndef HAVE_SETRESGID
+ zwarnnam("unsetopt", "PRIVILEGED: can't drop privileges; setresgid() and friends not available");
return -1;
-#endif
#else
- zwarnnam("unsetopt", "PRIVILEGED: can't drop privileges; setresgid and setregid not available");
- return -1;
-#endif
+ int setgid_err;
+ setgid_err = setresgid(getgid(), getgid(), getgid());
if (setgid_err) {
zwarnnam("unsetopt", "PRIVILEGED: can't drop privileges; failed to change group ID: %e", errno);
return -1;
}
+#endif
}
- if (!skip_setuid) {
-#if defined(HAVE_GETEUID) && defined(HAVE_SETUID)
- int orig_euid = geteuid();
-#endif
+ /* Set the UID second. */
+ {
+#ifndef HAVE_SETRESUID
+ zwarnnam("unsetopt", "PRIVILEGED: can't drop privileges; setresuid() and friends not available");
+ return -1;
+#else
int setuid_err;
-#if defined(HAVE_GETEUID) && defined(HAVE_INITGROUPS) && defined(HAVE_GETPWUID)
+
+# ifdef HAVE_INITGROUPS
+ /* Set the supplementary groups list. */
if (geteuid() == 0) {
struct passwd *pw = getpwuid(getuid());
if (pw == NULL) {
- zwarnnam("unsetopt", "can't drop privileges; failed to get user information for uid %d: %e",
- getuid(), errno);
- return -1;
- }
- if (initgroups(pw->pw_name, pw->pw_gid)) {
+ zwarnnam("unsetopt", "can't drop privileges; failed to get user information for uid %L: %e",
+ (long)getuid(), errno);
+ failed = 1;
+ } else if (initgroups(pw->pw_name, pw->pw_gid)) {
zwarnnam("unsetopt", "can't drop privileges; failed to set supplementary group list: %e", errno);
return -1;
}
+ } else if (getuid() != 0 &&
+ (geteuid() != getuid() || orig_egid != getegid())) {
+ zwarnnam("unsetopt", "PRIVILEGED: supplementary group list not changed due to lack of permissions: EUID=%L",
+ (long)geteuid());
+ failed = 1;
}
-#endif
+# else
+ /* initgroups() isn't in POSIX. If it's not available on the system,
+ * we silently skip it. */
+# endif
-#ifdef HAVE_SETRESUID
setuid_err = setresuid(getuid(), getuid(), getuid());
-#elif defined(HAVE_SETREUID)
-#if defined(HAVE_GETEUID) && defined(HAVE_SETUID) && defined(HAVE_GETUID)
- setuid_err = setreuid(getuid(), getuid());
-#else
- zwarnnam("unsetopt",
- "PRIVILEGED: can't drop privileges; setreuid available, but cannot check if saved uid changed");
- return -1;
-#endif
-#else
- zwarnnam("unsetopt", "PRIVILEGED: can't drop privileges; setresuid and setreuid not available");
- return -1;
-#endif
if (setuid_err) {
zwarnnam("unsetopt", "PRIVILEGED: can't drop privileges; failed to change user ID: %e", errno);
return -1;
}
-#if defined(HAVE_GETEUID) && defined(HAVE_SETUID) && defined(HAVE_GETUID)
- if (getuid() != 0 && !setuid(orig_euid)) {
- zwarnnam("unsetopt", "PRIVILEGED: can't drop privileges; was able to restore the euid");
- return -1;
- }
#endif
}
-#if defined(HAVE_GETEGID) && defined(HAVE_SETGID) && defined(HAVE_GETUID)
- if (getuid() != 0 && !skip_setgid && !setgid(orig_egid)) {
+#ifdef HAVE_SETGID
+ if (getuid() != 0 && orig_egid != getegid() &&
+ (setgid(orig_egid) != -1 || setegid(orig_egid) != -1)) {
zwarnnam("unsetopt", "PRIVILEGED: can't drop privileges; was able to restore the egid");
return -1;
}
#endif
+#ifdef HAVE_SETUID
+ if (getuid() != 0 && orig_euid != geteuid() &&
+ (setuid(orig_euid) != -1 || seteuid(orig_euid) != -1)) {
+ zwarnnam("unsetopt", "PRIVILEGED: can't drop privileges; was able to restore the euid");
+ return -1;
+ }
+#endif
+
+ if (failed) {
+ /* A warning message has been printed. */
+ return -1;
+ }
+
#ifdef JOB_CONTROL
} else if (!force && optno == MONITOR && value) {
if (new_opts[optno] == value)
diff --git a/Src/zsh.mdd b/Src/zsh.mdd
index 324435d..a2590dc 100644
--- a/Src/zsh.mdd
+++ b/Src/zsh.mdd
@@ -13,7 +13,8 @@ objects="builtin.o compat.o cond.o context.o \
exec.o glob.o hashtable.o hashnameddir.o \
hist.o init.o input.o jobs.o lex.o linklist.o loop.o math.o \
mem.o module.o options.o params.o parse.o pattern.o prompt.o signals.o \
-signames.o sort.o string.o subst.o text.o utils.o watch.o"
+signames.o sort.o string.o subst.o text.o utils.o watch.o \
+openssh_bsd_setres_id.o"
headers="../config.h zsh_system.h zsh.h sigcount.h signals.h \
prototypes.h hashtable.h ztype.h"
diff --git a/Src/zsh_system.h b/Src/zsh_system.h
index 5339b49..18fe09b 100644
--- a/Src/zsh_system.h
+++ b/Src/zsh_system.h
@@ -456,30 +456,90 @@ struct timezone {
# define setpgrp setpgid
#endif
-/* can we set the user/group id of a process */
+/* compatibility wrappers */
-#ifndef HAVE_SETUID
+/* Our strategy is as follows:
+ *
+ * - Ensure that either setre[ug]id() or set{e,}[ug]id() is available.
+ * - If setres[ug]id() are missing, provide them in terms of either
+ * setre[ug]id() or set{e,}[ug]id(), whichever is available.
+ * - Provide replacement setre[ug]id() or set{e,}[ug]id() if they are not
+ * available natively.
+ *
+ * There isn't a circular dependency because, right off the bat, we check that
+ * there's an end condition, and #error out otherwise.
+ */
+#if !defined(HAVE_SETREUID) && !(defined(HAVE_SETEUID) && defined(HAVE_SETUID))
+ /*
+ * If you run into this error, you have two options:
+ * - Teach zsh how to do the equivalent of setreuid() on your system
+ * - Remove support for PRIVILEGED option, and then remove the #error.
+ */
+# error "Don't know how to change UID"
+#endif
+#if !defined(HAVE_SETREGID) && !(defined(HAVE_SETEGID) && defined(HAVE_SETGID))
+ /* See above comment. */
+# error "Don't know how to change GID"
+#endif
+
+/* Provide setresuid(). */
+#ifndef HAVE_SETRESUID
+int setresuid(uid_t, uid_t, uid_t);
+# define HAVE_SETRESUID
+# define ZSH_IMPLEMENT_SETRESUID
# ifdef HAVE_SETREUID
-# define setuid(X) setreuid(X,X)
-# define setgid(X) setregid(X,X)
-# define HAVE_SETUID
+# define ZSH_HAVE_NATIVE_SETREUID
# endif
#endif
-/* can we set the effective user/group id of a process */
+/* Provide setresgid(). */
+#ifndef HAVE_SETRESGID
+int setresgid(gid_t, gid_t, gid_t);
+# define HAVE_SETRESGID
+# define ZSH_IMPLEMENT_SETRESGID
+# ifdef HAVE_SETREGID
+# define ZSH_HAVE_NATIVE_SETREGID
+# endif
+#endif
+/* Provide setreuid(). */
+#ifndef HAVE_SETREUID
+# define setreuid(X, Y) setresuid((X), (Y), -1)
+# define HAVE_SETREUID
+#endif
+
+/* Provide setregid(). */
+#ifndef HAVE_SETREGID
+# define setregid(X, Y) setresgid((X), (Y), -1)
+# define HAVE_SETREGID
+#endif
+
+/* Provide setuid(). */
+/* ### TODO: Either remove this (this function has been standard since 1985),
+ * ### or rewrite this without multiply-evaluating the argument */
+#ifndef HAVE_SETUID
+# define setuid(X) setreuid((X), (X))
+# define HAVE_SETUID
+#endif
+
+/* Provide setgid(). */
+#ifndef HAVE_SETGID
+/* ### TODO: Either remove this (this function has been standard since 1985),
+ * ### or rewrite this without multiply-evaluating the argument */
+# define setgid(X) setregid((X), (X))
+# define HAVE_SETGID
+#endif
+
+/* Provide seteuid(). */
#ifndef HAVE_SETEUID
-# ifdef HAVE_SETREUID
-# define seteuid(X) setreuid(-1,X)
-# define setegid(X) setregid(-1,X)
-# define HAVE_SETEUID
-# else
-# ifdef HAVE_SETRESUID
-# define seteuid(X) setresuid(-1,X,-1)
-# define setegid(X) setresgid(-1,X,-1)
-# define HAVE_SETEUID
-# endif
-# endif
+# define seteuid(X) setreuid(-1, (X))
+# define HAVE_SETEUID
+#endif
+
+/* Provide setegid(). */
+#ifndef HAVE_SETEGID
+# define setegid(X) setregid(-1, (X))
+# define HAVE_SETEGID
#endif
#ifdef HAVE_SYS_RESOURCE_H
diff --git a/Test/E01options.ztst b/Test/E01options.ztst
index 0f6bb34..c4c3d67 100644
--- a/Test/E01options.ztst
+++ b/Test/E01options.ztst
@@ -1391,3 +1391,18 @@ F:Regression test for workers/41811
?(anon):4: `break' active at end of function scope
?(anon):4: `break' active at end of function scope
?(anon):4: `break' active at end of function scope
+
+# There are further tests for PRIVILEGED in P01privileged.ztst.
+ if [[ -o privileged ]]; then
+ unsetopt privileged
+ fi
+ unsetopt privileged
+0:PRIVILEGED sanity check: unsetting is idempotent
+F:If this test fails at the first unsetopt, refer to P01privileged.ztst.
+
+ if [[ -o privileged ]]; then
+ (( UID != EUID ))
+ else
+ (( UID == EUID ))
+ fi
+0:PRIVILEGED sanity check: default value is correct
diff --git a/configure.ac b/configure.ac
index 51cdf89..4e30ad1 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1300,9 +1300,8 @@ AC_CHECK_FUNCS(strftime strptime mktime timelocal \
inet_aton inet_pton inet_ntop \
getlogin getpwent getpwnam getpwuid getgrgid getgrnam \
initgroups nis_list \
- getuid setuid seteuid setreuid setresuid setsid \
- getgid setgid setegid setregid setresgid \
- geteuid getegid \
+ setuid seteuid setreuid setresuid setsid \
+ setgid setegid setregid setresgid \
memcpy memmove strstr strerror strtoul \
getrlimit getrusage \
setlocale \
--
2.21.1
From 6caecc2efb2fa4c708fd27858962ace55d957dce Mon Sep 17 00:00:00 2001
From: dana <dana@dana.is>
Date: Sun, 29 Dec 2019 02:41:11 +0000
Subject: [PATCH 5/7] Improve PRIVILEGED fixes (again)
* Pass RGID instead of passwd GID to initgroups()
* Clean up #ifdefs, avoid unnecessary checks
* Flatten conditions
Upstream-commit: 26d02efa7a9b0a6b32e1a8bbc6aca6c544b94211
Signed-off-by: Kamil Dudka <kdudka@redhat.com>
---
Src/options.c | 92 ++++++++++++++++++++++++---------------------------
1 file changed, 43 insertions(+), 49 deletions(-)
diff --git a/Src/options.c b/Src/options.c
index deec560..8599ed3 100644
--- a/Src/options.c
+++ b/Src/options.c
@@ -780,91 +780,85 @@ dosetopt(int optno, int value, int force, char *new_opts)
} else if(optno == PRIVILEGED && !value) {
/* unsetting PRIVILEGED causes the shell to make itself unprivileged */
+/* For simplicity's sake, require both setresgid() and setresuid() up-front. */
+#if !defined(HAVE_SETRESGID)
+ zwarnnam("unsetopt", "PRIVILEGED: can't drop privileges; setresgid() and friends not available");
+ return -1;
+#elif !defined(HAVE_SETRESUID)
+ zwarnnam("unsetopt", "PRIVILEGED: can't drop privileges; setresuid() and friends not available");
+ return -1;
+#else
/* If set, return -1 so lastval will be non-zero. */
int failed = 0;
-
-#ifdef HAVE_SETUID
const int orig_euid = geteuid();
-#endif
const int orig_egid = getegid();
/*
* Set the GID first as if we set the UID to non-privileged it
* might be impossible to restore the GID.
*/
- {
-#ifndef HAVE_SETRESGID
- zwarnnam("unsetopt", "PRIVILEGED: can't drop privileges; setresgid() and friends not available");
+ if (setresgid(getgid(), getgid(), getgid())) {
+ zwarnnam("unsetopt", "PRIVILEGED: can't drop privileges; failed to change group ID: %e", errno);
return -1;
-#else
- int setgid_err;
- setgid_err = setresgid(getgid(), getgid(), getgid());
- if (setgid_err) {
- zwarnnam("unsetopt", "PRIVILEGED: can't drop privileges; failed to change group ID: %e", errno);
- return -1;
- }
-#endif
}
- /* Set the UID second. */
- {
-#ifndef HAVE_SETRESUID
- zwarnnam("unsetopt", "PRIVILEGED: can't drop privileges; setresuid() and friends not available");
- return -1;
-#else
- int setuid_err;
-
# ifdef HAVE_INITGROUPS
- /* Set the supplementary groups list. */
- if (geteuid() == 0) {
- struct passwd *pw = getpwuid(getuid());
- if (pw == NULL) {
- zwarnnam("unsetopt", "can't drop privileges; failed to get user information for uid %L: %e",
- (long)getuid(), errno);
- failed = 1;
- } else if (initgroups(pw->pw_name, pw->pw_gid)) {
- zwarnnam("unsetopt", "can't drop privileges; failed to set supplementary group list: %e", errno);
- return -1;
- }
- } else if (getuid() != 0 &&
- (geteuid() != getuid() || orig_egid != getegid())) {
- zwarnnam("unsetopt", "PRIVILEGED: supplementary group list not changed due to lack of permissions: EUID=%L",
- (long)geteuid());
+ /* Set the supplementary groups list.
+ *
+ * Note that on macOS, FreeBSD, and possibly some other platforms,
+ * initgroups() resets the EGID to its second argument (see setgroups(2) for
+ * details). This has the potential to leave the EGID in an unexpected
+ * state. However, it seems common in other projects that do this dance to
+ * simply re-use the same GID that's going to become the EGID anyway, in
+ * which case it doesn't matter. That's what we do here. It's therefore
+ * possible, in some probably uncommon cases, that the shell ends up not
+ * having the privileges of the RUID user's primary/passwd group. */
+ if (geteuid() == 0) {
+ struct passwd *pw = getpwuid(getuid());
+ if (pw == NULL) {
+ zwarnnam("unsetopt", "can't drop privileges; failed to get user information for uid %L: %e",
+ (long)getuid(), errno);
failed = 1;
+ /* This may behave strangely in the unlikely event that the same user
+ * name appears with multiple UIDs in the passwd database */
+ } else if (initgroups(pw->pw_name, getgid())) {
+ zwarnnam("unsetopt", "can't drop privileges; failed to set supplementary group list: %e", errno);
+ return -1;
}
+ } else if (getuid() != 0 &&
+ (geteuid() != getuid() || orig_egid != getegid())) {
+ zwarnnam("unsetopt", "PRIVILEGED: supplementary group list not changed due to lack of permissions: EUID=%L",
+ (long)geteuid());
+ failed = 1;
+ }
# else
- /* initgroups() isn't in POSIX. If it's not available on the system,
- * we silently skip it. */
+ /* initgroups() isn't in POSIX. If it's not available on the system,
+ * we silently skip it. */
# endif
- setuid_err = setresuid(getuid(), getuid(), getuid());
- if (setuid_err) {
- zwarnnam("unsetopt", "PRIVILEGED: can't drop privileges; failed to change user ID: %e", errno);
- return -1;
- }
-#endif
+ /* Set the UID second. */
+ if (setresuid(getuid(), getuid(), getuid())) {
+ zwarnnam("unsetopt", "PRIVILEGED: can't drop privileges; failed to change user ID: %e", errno);
+ return -1;
}
-#ifdef HAVE_SETGID
if (getuid() != 0 && orig_egid != getegid() &&
(setgid(orig_egid) != -1 || setegid(orig_egid) != -1)) {
zwarnnam("unsetopt", "PRIVILEGED: can't drop privileges; was able to restore the egid");
return -1;
}
-#endif
-#ifdef HAVE_SETUID
if (getuid() != 0 && orig_euid != geteuid() &&
(setuid(orig_euid) != -1 || seteuid(orig_euid) != -1)) {
zwarnnam("unsetopt", "PRIVILEGED: can't drop privileges; was able to restore the euid");
return -1;
}
-#endif
if (failed) {
/* A warning message has been printed. */
return -1;
}
+#endif /* HAVE_SETRESGID && HAVE_SETRESUID */
#ifdef JOB_CONTROL
} else if (!force && optno == MONITOR && value) {
--
2.21.1
From 7d224cc6d93933db596ecb4ec78ba5bf48ef2d32 Mon Sep 17 00:00:00 2001
From: dana <dana@dana.is>
Date: Sun, 29 Dec 2019 02:43:14 +0000
Subject: [PATCH 6/7] Clean up error-message white space
Upstream-commit: 4ce66857b71b40a0661df3780ff557f2b0f4cb13
Signed-off-by: Kamil Dudka <kdudka@redhat.com>
---
Src/options.c | 30 +++++++++++++++++++++---------
1 file changed, 21 insertions(+), 9 deletions(-)
diff --git a/Src/options.c b/Src/options.c
index 8599ed3..5b972d4 100644
--- a/Src/options.c
+++ b/Src/options.c
@@ -782,10 +782,12 @@ dosetopt(int optno, int value, int force, char *new_opts)
/* For simplicity's sake, require both setresgid() and setresuid() up-front. */
#if !defined(HAVE_SETRESGID)
- zwarnnam("unsetopt", "PRIVILEGED: can't drop privileges; setresgid() and friends not available");
+ zwarnnam("unsetopt",
+ "PRIVILEGED: can't drop privileges; setresgid() and friends not available");
return -1;
#elif !defined(HAVE_SETRESUID)
- zwarnnam("unsetopt", "PRIVILEGED: can't drop privileges; setresuid() and friends not available");
+ zwarnnam("unsetopt",
+ "PRIVILEGED: can't drop privileges; setresuid() and friends not available");
return -1;
#else
/* If set, return -1 so lastval will be non-zero. */
@@ -798,7 +800,9 @@ dosetopt(int optno, int value, int force, char *new_opts)
* might be impossible to restore the GID.
*/
if (setresgid(getgid(), getgid(), getgid())) {
- zwarnnam("unsetopt", "PRIVILEGED: can't drop privileges; failed to change group ID: %e", errno);
+ zwarnnam("unsetopt",
+ "PRIVILEGED: can't drop privileges; failed to change group ID: %e",
+ errno);
return -1;
}
@@ -816,18 +820,22 @@ dosetopt(int optno, int value, int force, char *new_opts)
if (geteuid() == 0) {
struct passwd *pw = getpwuid(getuid());
if (pw == NULL) {
- zwarnnam("unsetopt", "can't drop privileges; failed to get user information for uid %L: %e",
+ zwarnnam("unsetopt",
+ "can't drop privileges; failed to get user information for uid %L: %e",
(long)getuid(), errno);
failed = 1;
/* This may behave strangely in the unlikely event that the same user
* name appears with multiple UIDs in the passwd database */
} else if (initgroups(pw->pw_name, getgid())) {
- zwarnnam("unsetopt", "can't drop privileges; failed to set supplementary group list: %e", errno);
+ zwarnnam("unsetopt",
+ "can't drop privileges; failed to set supplementary group list: %e",
+ errno);
return -1;
}
} else if (getuid() != 0 &&
(geteuid() != getuid() || orig_egid != getegid())) {
- zwarnnam("unsetopt", "PRIVILEGED: supplementary group list not changed due to lack of permissions: EUID=%L",
+ zwarnnam("unsetopt",
+ "PRIVILEGED: supplementary group list not changed due to lack of permissions: EUID=%L",
(long)geteuid());
failed = 1;
}
@@ -838,19 +846,23 @@ dosetopt(int optno, int value, int force, char *new_opts)
/* Set the UID second. */
if (setresuid(getuid(), getuid(), getuid())) {
- zwarnnam("unsetopt", "PRIVILEGED: can't drop privileges; failed to change user ID: %e", errno);
+ zwarnnam("unsetopt",
+ "PRIVILEGED: can't drop privileges; failed to change user ID: %e",
+ errno);
return -1;
}
if (getuid() != 0 && orig_egid != getegid() &&
(setgid(orig_egid) != -1 || setegid(orig_egid) != -1)) {
- zwarnnam("unsetopt", "PRIVILEGED: can't drop privileges; was able to restore the egid");
+ zwarnnam("unsetopt",
+ "PRIVILEGED: can't drop privileges; was able to restore the egid");
return -1;
}
if (getuid() != 0 && orig_euid != geteuid() &&
(setuid(orig_euid) != -1 || seteuid(orig_euid) != -1)) {
- zwarnnam("unsetopt", "PRIVILEGED: can't drop privileges; was able to restore the euid");
+ zwarnnam("unsetopt",
+ "PRIVILEGED: can't drop privileges; was able to restore the euid");
return -1;
}
--
2.21.1
From a86d3b201352f14bc17c9521baeb5eaa2ad60f1a Mon Sep 17 00:00:00 2001
From: dana <dana@dana.is>
Date: Sat, 28 Dec 2019 20:45:55 -0600
Subject: [PATCH 7/7] Add unsetopt/PRIVILEGED tests
Upstream-commit: b15bd4aa590db8087d1e8f2eb1af2874f5db814d
Signed-off-by: Kamil Dudka <kdudka@redhat.com>
---
Test/E01options.ztst | 10 +-
Test/P01privileged.ztst | 197 ++++++++++++++++++++++++++++++++++++++++
Test/README | 1 +
3 files changed, 207 insertions(+), 1 deletion(-)
create mode 100644 Test/P01privileged.ztst
diff --git a/Test/E01options.ztst b/Test/E01options.ztst
index c4c3d67..767879a 100644
--- a/Test/E01options.ztst
+++ b/Test/E01options.ztst
@@ -74,7 +74,6 @@
# HASH_LIST_ALL )
# PRINT_EXIT_STATUS haven't worked out what this does yet, although
# Bart suggested a fix.
-# PRIVILEGED (similar to GLOBAL_RCS)
# RCS ( " " " " )
# SH_OPTION_LETTERS even I found this too dull to set up a test for
# SINGLE_COMMAND kills shell
@@ -95,6 +94,15 @@
%test
+ # setopt should move on to the next operation in the face of an error, but
+ # preserve the >0 return code
+ unsetopt aliases
+ setopt not_a_real_option aliases && return 2
+ print -r - $options[aliases]
+0:setopt error handling
+?(eval):setopt:4: no such option: not_a_real_option
+>on
+
alias echo='print foo'
unsetopt aliases
# use eval else aliases are all parsed at start
diff --git a/Test/P01privileged.ztst b/Test/P01privileged.ztst
new file mode 100644
index 0000000..c54112b
--- /dev/null
+++ b/Test/P01privileged.ztst
@@ -0,0 +1,197 @@
+# This file contains tests related to the PRIVILEGED option. In order to run,
+# it requires that the test process itself have super-user privileges (or that
+# one of the environment variables described below be set). This can be achieved
+# via, e.g., `sudo make check TESTNUM=P`.
+#
+# Optionally, the environment variables ZSH_TEST_UNPRIVILEGED_UID and/or
+# ZSH_TEST_UNPRIVILEGED_GID may be set to UID:EUID or GID:EGID pairs, where the
+# two IDs in each pair are different, non-0 IDs valid on the system being used
+# to run the tests. (The UIDs must both be non-0 to effectively test downgrading
+# of privileges, and they must be non-matching to test auto-enabling of
+# PRIVILEGED and to ensure that disabling PRIVILEGED correctly resets the saved
+# UID. Technically GID 0 is not special, but for simplicity's sake we apply the
+# same requirements here.)
+#
+# If either of the aforementioned environment variables is not set, the test
+# script will try to pick the first two >0 IDs from the passwd/group databases
+# on the current system.
+#
+# If either variable is set, the tests will run, but they will likely fail
+# without super-user privileges.
+
+%prep
+
+ # Mind your empty lines here. The logic in this %prep section is somewhat
+ # complex compared to most others; to avoid lots of nested/duplicated
+ # conditions we need to make sure that this all gets executed as a single
+ # function from which we can return early
+ [[ $EUID == 0 || -n $ZSH_TEST_UNPRIVILEGED_UID$ZSH_TEST_UNPRIVILEGED_GID ]] || {
+ ZTST_unimplemented='PRIVILEGED tests require super-user privileges (or env var)'
+ return 1
+ }
+ (( $+commands[perl] )) || { # @todo Eliminate this dependency with a C wrapper?
+ ZTST_unimplemented='PRIVILEGED tests require Perl'
+ return 1
+ }
+ grep -qE '#define HAVE_SETRES?UID' $ZTST_testdir/../config.h || {
+ ZTST_unimplemented='PRIVILEGED tests require setreuid()/setresuid()'
+ return 1
+ }
+ #
+ ruid= euid= rgid= egid=
+ #
+ if [[ -n $ZSH_TEST_UNPRIVILEGED_UID ]]; then
+ ruid=${ZSH_TEST_UNPRIVILEGED_UID%%:*}
+ euid=${ZSH_TEST_UNPRIVILEGED_UID##*:}
+ else
+ print -ru$ZTST_fd 'Selecting unprivileged UID:EUID pair automatically'
+ local tmp=$( getent passwd 2> /dev/null || < /etc/passwd )
+ # Note: Some awks require -v and its argument to be separate
+ ruid=$( awk -F: '$3 > 0 { print $3; exit; }' <<< $tmp )
+ euid=$( awk -F: -v u=$ruid '$3 > u { print $3; exit; }' <<< $tmp )
+ fi
+ #
+ if [[ -n $ZSH_TEST_UNPRIVILEGED_GID ]]; then
+ rgid=${ZSH_TEST_UNPRIVILEGED_GID%%:*}
+ egid=${ZSH_TEST_UNPRIVILEGED_GID##*:}
+ else
+ print -ru$ZTST_fd 'Selecting unprivileged GID:EGID pair automatically'
+ local tmp=$( getent group 2> /dev/null || < /etc/group )
+ # Note: Some awks require -v and its argument to be separate
+ rgid=$( awk -F: '$3 > 0 { print $3; exit; }' <<< $tmp )
+ egid=$( awk -F: -v g=$rgid '$3 > g { print $3; exit; }' <<< $tmp )
+ fi
+ #
+ [[ $ruid/$euid == <1->/<1-> && $ruid != $euid ]] || ruid= euid=
+ [[ $rgid/$egid == <1->/<1-> && $rgid != $egid ]] || rgid= egid=
+ #
+ [[ -n $ruid && -n $euid ]] || {
+ ZTST_unimplemented='PRIVILEGED tests require unprivileged UID:EUID'
+ return 1
+ }
+ [[ -n $rgid || -n $egid ]] || {
+ ZTST_unimplemented='PRIVILEGED tests require unprivileged GID:EGID'
+ return 1
+ }
+ #
+ print -ru$ZTST_fd \
+ "Using unprivileged UID $ruid, EUID $euid, GID $rgid, EGID $egid"
+ #
+ # Execute process with specified UID and EUID
+ # $1 => Real UID
+ # $2 => Effective UID
+ # $3 => Real GID
+ # $4 => Effective GID
+ # $5 ... => Command + args to execute (must NOT be a shell command string)
+ re_exec() {
+ perl -e '
+ die("re_exec: not enough arguments") unless (@ARGV >= 5);
+ my ($ruid, $euid, $rgid, $egid, @cmd) = @ARGV;
+ foreach my $id ($ruid, $euid, $rgid, $egid) {
+ die("re_exec: invalid ID: $id") unless ($id =~ /^(-1|\d+)$/a);
+ }
+ $< = 0 + $ruid if ($ruid >= 0);
+ $> = 0 + $euid if ($euid >= 0);
+ $( = 0 + $rgid if ($rgid >= 0);
+ $) = 0 + $egid if ($egid >= 0);
+ exec(@cmd);
+ die("re_exec: exec failed: $!");
+ ' -- "$@"
+ }
+ #
+ # Convenience wrapper for re_exec to call `zsh -c`
+ # -* ... => (optional) Command-line options to zsh
+ # $1 => Real UID
+ # $2 => Effective UID
+ # $3 => Real GID
+ # $4 => Effective GID
+ # $5 ... => zsh command string; multiple strings are joined by \n
+ re_zsh() {
+ local -a opts
+ while [[ $1 == -[A-Za-z-]* ]]; do
+ opts+=( $1 )
+ shift
+ done
+ re_exec "$1" "$2" "$3" "$4" $ZTST_exe $opts -fc \
+ "MODULE_PATH=${(q)MODULE_PATH}; ${(F)@[5,-1]}"
+ }
+ #
+ # Return one or more random unused UIDs
+ # $1 ... => Names of parameters to store UIDs in
+ get_unused_uid() {
+ while (( $# )); do
+ local i_=0 uid_=
+ until [[ -n $uid_ ]]; do
+ (( ++i_ > 99 )) && return 1
+ uid_=$RANDOM
+ id $uid_ &> /dev/null || break
+ uid_=
+ done
+ : ${(P)1::=$uid_}
+ shift
+ done
+ }
+
+%test
+
+ re_zsh $ruid $ruid -1 -1 'echo $UID/$EUID $options[privileged]'
+ re_zsh $euid $euid -1 -1 'echo $UID/$EUID $options[privileged]'
+ re_zsh $ruid $euid -1 -1 'echo $UID/$EUID $options[privileged]'
+0q:PRIVILEGED automatically enabled when RUID != EUID
+>$ruid/$ruid off
+>$euid/$euid off
+>$ruid/$euid on
+
+ re_zsh -1 -1 $rgid $rgid 'echo $GID/$EGID $options[privileged]'
+ re_zsh -1 -1 $egid $egid 'echo $GID/$EGID $options[privileged]'
+ re_zsh -1 -1 $rgid $egid 'echo $GID/$EGID $options[privileged]'
+0q:PRIVILEGED automatically enabled when RGID != EGID
+>$rgid/$rgid off
+>$egid/$egid off
+>$rgid/$egid on
+
+ re_zsh $ruid $euid -1 -1 'unsetopt privileged; echo $UID/$EUID'
+0q:EUID set to RUID after disabling PRIVILEGED
+*?zsh:unsetopt:1: PRIVILEGED: supplementary group list not changed *
+*?zsh:unsetopt:1: can't change option: privileged
+>$ruid/$ruid
+
+ re_zsh 0 $euid -1 -1 'unsetopt privileged && echo $UID/$EUID'
+0:RUID/EUID set to 0/0 when privileged after disabling PRIVILEGED
+>0/0
+
+ re_zsh $ruid $euid -1 -1 "unsetopt privileged; UID=$euid" ||
+ re_zsh $ruid $euid -1 -1 "unsetopt privileged; EUID=$euid"
+1:not possible to regain EUID when unprivileged after disabling PRIVILEGED
+*?zsh:unsetopt:1: PRIVILEGED: supplementary group list not changed *
+*?zsh:unsetopt:1: can't change option: privileged
+*?zsh:1: failed to change user ID: *
+*?zsh:unsetopt:1: PRIVILEGED: supplementary group list not changed *
+*?zsh:unsetopt:1: can't change option: privileged
+*?zsh:1: failed to change effective user ID: *
+
+ re_zsh -1 -1 $rgid $egid 'unsetopt privileged && echo $GID/$EGID'
+0q:EGID set to RGID after disabling PRIVILEGED
+>$rgid/$rgid
+
+# This test also confirms that we can't revert to the original EUID's primary
+# GID, which initgroups() may reset the EGID to on some systems
+ re_zsh $ruid 0 $rgid 0 'unsetopt privileged; GID=0' ||
+ re_zsh $ruid 0 $rgid 0 'unsetopt privileged; EGID=0'
+1:not possible to regain EGID when unprivileged after disabling PRIVILEGED
+*?zsh:1: failed to change group ID: *
+*?zsh:1: failed to change effective group ID: *
+
+ local rruid
+ grep -qF '#define HAVE_INITGROUPS' $ZTST_testdir/../config.h || {
+ ZTST_skip='initgroups() not available'
+ return 1
+ }
+ get_unused_uid rruid || {
+ ZTST_skip="Can't get unused UID"
+ return 1
+ }
+ re_zsh $rruid 0 -1 -1 'unsetopt privileged'
+1:getpwuid() fails with non-existent RUID and 0 EUID
+*?zsh:unsetopt:1: can't drop privileges; failed to get user information *
+*?zsh:unsetopt:1: can't change option: privileged
diff --git a/Test/README b/Test/README
index d012277..726d68e 100644
--- a/Test/README
+++ b/Test/README
@@ -6,6 +6,7 @@ scripts names:
C: shell commands with special syntax
D: substititution
E: options
+ P: privileged (needs super-user privileges)
V: modules
W: builtin interactive commands and constructs
X: line editing
--
2.21.1
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