summaryrefslogtreecommitdiffstats
path: root/libmisc/idmapping.c
diff options
context:
space:
mode:
Diffstat (limited to '')
-rw-r--r--libmisc/idmapping.c219
1 files changed, 219 insertions, 0 deletions
diff --git a/libmisc/idmapping.c b/libmisc/idmapping.c
new file mode 100644
index 0000000..aea9493
--- /dev/null
+++ b/libmisc/idmapping.c
@@ -0,0 +1,219 @@
+/*
+ * Copyright (c) 2013 Eric Biederman
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. The name of the copyright holders or contributors may not be used to
+ * endorse or promote products derived from this software without
+ * specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
+ * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <config.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <limits.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include "prototypes.h"
+#include "idmapping.h"
+#include <sys/prctl.h>
+#if HAVE_SYS_CAPABILITY_H
+#include <sys/capability.h>
+#endif
+
+struct map_range *get_map_ranges(int ranges, int argc, char **argv)
+{
+ struct map_range *mappings, *mapping;
+ int idx, argidx;
+
+ if (ranges < 0 || argc < 0) {
+ fprintf(stderr, "%s: error calculating number of arguments\n", Prog);
+ return NULL;
+ }
+
+ if (ranges != ((argc + 2) / 3)) {
+ fprintf(stderr, "%s: ranges: %u is wrong for argc: %d\n", Prog, ranges, argc);
+ return NULL;
+ }
+
+ if ((ranges * 3) > argc) {
+ fprintf(stderr, "ranges: %u argc: %d\n",
+ ranges, argc);
+ fprintf(stderr,
+ _( "%s: Not enough arguments to form %u mappings\n"),
+ Prog, ranges);
+ return NULL;
+ }
+
+ mappings = calloc(ranges, sizeof(*mappings));
+ if (!mappings) {
+ fprintf(stderr, _( "%s: Memory allocation failure\n"),
+ Prog);
+ exit(EXIT_FAILURE);
+ }
+
+ /* Gather up the ranges from the command line */
+ mapping = mappings;
+ for (idx = 0, argidx = 0; idx < ranges; idx++, argidx += 3, mapping++) {
+ if (!getulong(argv[argidx + 0], &mapping->upper)) {
+ free(mappings);
+ return NULL;
+ }
+ if (!getulong(argv[argidx + 1], &mapping->lower)) {
+ free(mappings);
+ return NULL;
+ }
+ if (!getulong(argv[argidx + 2], &mapping->count)) {
+ free(mappings);
+ return NULL;
+ }
+ if (ULONG_MAX - mapping->upper <= mapping->count || ULONG_MAX - mapping->lower <= mapping->count) {
+ fprintf(stderr, _( "%s: subuid overflow detected.\n"), Prog);
+ exit(EXIT_FAILURE);
+ }
+ if (mapping->upper > UINT_MAX ||
+ mapping->lower > UINT_MAX ||
+ mapping->count > UINT_MAX) {
+ fprintf(stderr, _( "%s: subuid overflow detected.\n"), Prog);
+ exit(EXIT_FAILURE);
+ }
+ if (mapping->lower + mapping->count > UINT_MAX ||
+ mapping->upper + mapping->count > UINT_MAX) {
+ fprintf(stderr, _( "%s: subuid overflow detected.\n"), Prog);
+ exit(EXIT_FAILURE);
+ }
+ if (mapping->lower + mapping->count < mapping->lower ||
+ mapping->upper + mapping->count < mapping->upper) {
+ /* this one really shouldn't be possible given previous checks */
+ fprintf(stderr, _( "%s: subuid overflow detected.\n"), Prog);
+ exit(EXIT_FAILURE);
+ }
+ }
+ return mappings;
+}
+
+/* Number of ascii digits needed to print any unsigned long in decimal.
+ * There are approximately 10 bits for every 3 decimal digits.
+ * So from bits to digits the formula is roundup((Number of bits)/10) * 3.
+ * For common sizes of integers this works out to:
+ * 2bytes --> 6 ascii estimate -> 65536 (5 real)
+ * 4bytes --> 12 ascii estimated -> 4294967296 (10 real)
+ * 8bytes --> 21 ascii estimated -> 18446744073709551616 (20 real)
+ * 16bytes --> 39 ascii estimated -> 340282366920938463463374607431768211456 (39 real)
+ */
+#define ULONG_DIGITS ((((sizeof(unsigned long) * CHAR_BIT) + 9)/10)*3)
+
+/*
+ * The ruid refers to the caller's uid and is used to reset the effective uid
+ * back to the callers real uid.
+ * This clutch mainly exists for setuid-based new{g,u}idmap binaries that are
+ * called in contexts where all capabilities other than the necessary
+ * CAP_SET{G,U}ID capabilities are dropped. Since the kernel will require
+ * assurance that the caller holds CAP_SYS_ADMIN over the target user namespace
+ * the only way it can confirm is in this case is if the effective uid is
+ * equivalent to the uid owning the target user namespace.
+ * Note, we only support this when a) new{g,u}idmap is not called by root and
+ * b) if the caller's uid and the uid retrieved via system appropriate means
+ * (shadow file or other) are identical. Specifically, this does not support
+ * when the root user calls the new{g,u}idmap binary for an unprivileged user.
+ * If this is wanted: use file capabilities!
+ */
+void write_mapping(int proc_dir_fd, int ranges, struct map_range *mappings,
+ const char *map_file, uid_t ruid)
+{
+ int idx;
+ struct map_range *mapping;
+ size_t bufsize;
+ char *buf, *pos;
+ int fd;
+
+#if HAVE_SYS_CAPABILITY_H
+ int cap;
+ struct __user_cap_header_struct hdr = {_LINUX_CAPABILITY_VERSION_3, 0};
+ struct __user_cap_data_struct data[2] = {{0}};
+
+ if (strcmp(map_file, "uid_map") == 0) {
+ cap = CAP_SETUID;
+ } else if (strcmp(map_file, "gid_map") == 0) {
+ cap = CAP_SETGID;
+ } else {
+ fprintf(stderr, _("%s: Invalid map file %s specified\n"), Prog, map_file);
+ exit(EXIT_FAILURE);
+ }
+
+ /* Align setuid- and fscaps-based new{g,u}idmap behavior. */
+ if (geteuid() == 0 && geteuid() != ruid) {
+ if (prctl(PR_SET_KEEPCAPS, 1, 0, 0, 0) < 0) {
+ fprintf(stderr, _("%s: Could not prctl(PR_SET_KEEPCAPS)\n"), Prog);
+ exit(EXIT_FAILURE);
+ }
+
+ if (seteuid(ruid) < 0) {
+ fprintf(stderr, _("%s: Could not seteuid to %d\n"), Prog, ruid);
+ exit(EXIT_FAILURE);
+ }
+ }
+
+ /* Lockdown new{g,u}idmap by dropping all unneeded capabilities. */
+ memset(data, 0, sizeof(data));
+ data[0].effective = CAP_TO_MASK(cap);
+ data[0].permitted = data[0].effective;
+ if (capset(&hdr, data) < 0) {
+ fprintf(stderr, _("%s: Could not set caps\n"), Prog);
+ exit(EXIT_FAILURE);
+ }
+#endif
+
+ bufsize = ranges * ((ULONG_DIGITS + 1) * 3);
+ pos = buf = xmalloc(bufsize);
+
+ /* Build the mapping command */
+ mapping = mappings;
+ for (idx = 0; idx < ranges; idx++, mapping++) {
+ /* Append this range to the string that will be written */
+ int written = snprintf(pos, bufsize - (pos - buf),
+ "%lu %lu %lu\n",
+ mapping->upper,
+ mapping->lower,
+ mapping->count);
+ if ((written <= 0) || (written >= (bufsize - (pos - buf)))) {
+ fprintf(stderr, _("%s: snprintf failed!\n"), Prog);
+ exit(EXIT_FAILURE);
+ }
+ pos += written;
+ }
+
+ /* Write the mapping to the mapping file */
+ fd = openat(proc_dir_fd, map_file, O_WRONLY);
+ if (fd < 0) {
+ fprintf(stderr, _("%s: open of %s failed: %s\n"),
+ Prog, map_file, strerror(errno));
+ exit(EXIT_FAILURE);
+ }
+ if (write(fd, buf, pos - buf) != (pos - buf)) {
+ fprintf(stderr, _("%s: write to %s failed: %s\n"),
+ Prog, map_file, strerror(errno));
+ exit(EXIT_FAILURE);
+ }
+ close(fd);
+}