1 files changed, 0 insertions, 223 deletions
diff --git a/libmisc/idmapping.c b/libmisc/idmapping.c
deleted file mode 100644
index 30eb89f..0000000
--- a/libmisc/idmapping.c
+++ /dev/null
@@ -1,223 +0,0 @@
-/*
- * SPDX-FileCopyrightText: 2013 Eric Biederman
- *
- * SPDX-License-Identifier: BSD-3-Clause
- */
-
-#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"
-#if HAVE_SYS_CAPABILITY_H
-#include <sys/prctl.h>
-#include <sys/capability.h>
-#endif
-#include "shadowlog.h"
-
-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(log_get_logfd(), "%s: error calculating number of arguments\n", log_get_progname());
-		return NULL;
-	}
-
-	if (ranges != ((argc + 2) / 3)) {
-		fprintf(log_get_logfd(), "%s: ranges: %u is wrong for argc: %d\n", log_get_progname(), ranges, argc);
-		return NULL;
-	}
-
-	if ((ranges * 3) > argc) {
-		fprintf(log_get_logfd(), "ranges: %u argc: %d\n",
-			ranges, argc);
-		fprintf(log_get_logfd(),
-			_( "%s: Not enough arguments to form %u mappings\n"),
-			log_get_progname(), ranges);
-		return NULL;
-	}
-
-	mappings = calloc(ranges, sizeof(*mappings));
-	if (!mappings) {
-		fprintf(log_get_logfd(), _( "%s: Memory allocation failure\n"),
-			log_get_progname());
-		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(log_get_logfd(), _( "%s: subuid overflow detected.\n"), log_get_progname());
-			exit(EXIT_FAILURE);
-		}
-		if (mapping->upper > UINT_MAX ||
-			mapping->lower > UINT_MAX ||
-			mapping->count > UINT_MAX)  {
-			fprintf(log_get_logfd(), _( "%s: subuid overflow detected.\n"), log_get_progname());
-			exit(EXIT_FAILURE);
-		}
-		if (mapping->lower + mapping->count > UINT_MAX ||
-				mapping->upper + mapping->count > UINT_MAX) {
-			fprintf(log_get_logfd(), _( "%s: subuid overflow detected.\n"), log_get_progname());
-			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(log_get_logfd(), _( "%s: subuid overflow detected.\n"), log_get_progname());
-			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)
-
-#if HAVE_SYS_CAPABILITY_H
-static inline bool maps_lower_root(int cap, int ranges, const struct map_range *mappings)
-{
-	int idx;
-	const struct map_range *mapping;
-
-	if (cap != CAP_SETUID)
-		return false;
-
-	mapping = mappings;
-	for (idx = 0; idx < ranges; idx++, mapping++) {
-		if (mapping->lower == 0)
-			return true;
-	}
-
-	return false;
-}
-#endif
-
-/*
- * 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, const struct map_range *mappings,
-	const char *map_file, uid_t ruid)
-{
-	int idx;
-	const 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(log_get_logfd(), _("%s: Invalid map file %s specified\n"), log_get_progname(), 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(log_get_logfd(), _("%s: Could not prctl(PR_SET_KEEPCAPS)\n"), log_get_progname());
-			exit(EXIT_FAILURE);
-		}
-
-		if (seteuid(ruid) < 0) {
-			fprintf(log_get_logfd(), _("%s: Could not seteuid to %d\n"), log_get_progname(), 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);
-	/*
-	 * When uid 0 from the ancestor userns is supposed to be mapped into
-	 * the child userns we need to retain CAP_SETFCAP.
-	 */
-	if (maps_lower_root(cap, ranges, mappings))
-		data[0].effective |= CAP_TO_MASK(CAP_SETFCAP);
-	data[0].permitted = data[0].effective;
-	if (capset(&hdr, data) < 0) {
-		fprintf(log_get_logfd(), _("%s: Could not set caps\n"), log_get_progname());
-		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(log_get_logfd(), _("%s: snprintf failed!\n"), log_get_progname());
-			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(log_get_logfd(), _("%s: open of %s failed: %s\n"),
-			log_get_progname(), map_file, strerror(errno));
-		exit(EXIT_FAILURE);
-	}
-	if (write(fd, buf, pos - buf) != (pos - buf)) {
-		fprintf(log_get_logfd(), _("%s: write to %s failed: %s\n"),
-			log_get_progname(), map_file, strerror(errno));
-		exit(EXIT_FAILURE);
-	}
-	close(fd);
-	free(buf);
-}