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mount.cifs.c
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/*
* Mount helper utility for Linux CIFS VFS (virtual filesystem) client
* Copyright (C) 2003,2010 Steve French ([email protected])
* Copyright (C) 2008 Jeremy Allison ([email protected])
* Copyright (C) 2010 Jeff Layton ([email protected])
*
* 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 3 of the License, 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, see <http://www.gnu.org/licenses/>.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif /* HAVE_CONFIG_H */
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <pwd.h>
#include <grp.h>
#include <ctype.h>
#include <sys/types.h>
#include <sys/mount.h>
#include <sys/stat.h>
#include <sys/utsname.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <getopt.h>
#include <errno.h>
#include <netdb.h>
#include <string.h>
#include <mntent.h>
#include <fcntl.h>
#include <limits.h>
#include <paths.h>
#include <libgen.h>
#include <time.h>
#include <sys/mman.h>
#include <sys/wait.h>
#ifdef HAVE_SYS_FSUID_H
#include <sys/fsuid.h>
#endif /* HAVE_SYS_FSUID_H */
#ifdef HAVE_LIBCAP_NG
#include <cap-ng.h>
#else /* HAVE_LIBCAP_NG */
#ifdef HAVE_PRCTL
#include <sys/prctl.h>
#endif /* HAVE_PRCTL */
#ifdef HAVE_LIBCAP
#include <sys/capability.h>
#endif /* HAVE_LIBCAP */
#endif /* HAVE_LIBCAP_NG */
#include "mount.h"
#include "util.h"
#include "resolve_host.h"
#ifndef MS_MOVE
#define MS_MOVE 8192
#endif
#ifndef MS_BIND
#define MS_BIND 4096
#endif
/* private flags - clear these before passing to kernel */
#define MS_USERS 0x40000000
#define MS_USER 0x80000000
#define MAX_UNC_LEN 1024
/* I believe that the kernel limits options data to a page */
#define MAX_OPTIONS_LEN 4096
/* max length of mtab options */
#define MTAB_OPTIONS_LEN 220
/*
* Max share name, username, password and domain sizes match the kernel's
* allowances for these string sizes which in turn match Microsoft's
* documentation.
*/
/* Max length of the share name portion of a UNC. Share names over 80
* characters cannot be accessed via commandline in Windows 2000/XP. */
#define MAX_SHARE_LEN 256
/* Max user name length. */
#define MAX_USERNAME_SIZE 256
/* Max domain size. */
#define MAX_DOMAIN_SIZE 256
/* Max password size. */
#define MOUNT_PASSWD_SIZE 512
/*
* mount.cifs has been the subject of many "security" bugs that have arisen
* because of users and distributions installing it as a setuid root program
* before it had been audited for security holes. The default behavior is
* now to allow mount.cifs to be run as a setuid root program. Some admins
* may want to disable this fully, so this switch remains in place.
*/
#define CIFS_DISABLE_SETUID_CAPABILITY 0
/*
* When an unprivileged user runs a setuid mount.cifs, we set certain mount
* flags by default. These defaults can be changed here.
*/
#define CIFS_SETUID_FLAGS (MS_NOSUID|MS_NODEV)
/*
* Values for parsing a credentials file.
*/
#define CRED_UNPARSEABLE 0
#define CRED_USER 1
#define CRED_PASS 2
#define CRED_DOM 4
/*
* Values for parsing command line options.
*/
#define OPT_ERROR -1
#define OPT_IGNORE 0
#define OPT_USERS 1
#define OPT_USER 2
#define OPT_USER_XATTR 3
#define OPT_PASS 4
#define OPT_SEC 5
#define OPT_IP 6
#define OPT_UNC 7
#define OPT_CRED 8
#define OPT_UID 9
#define OPT_GID 10
#define OPT_FMASK 11
#define OPT_FILE_MODE 12
#define OPT_DMASK 13
#define OPT_DIR_MODE 14
#define OPT_DOM 15
#define OPT_NO_SUID 16
#define OPT_SUID 17
#define OPT_NO_DEV 18
#define OPT_DEV 19
#define OPT_NO_LOCK 20
#define OPT_NO_EXEC 21
#define OPT_EXEC 22
#define OPT_GUEST 23
#define OPT_RO 24
#define OPT_RW 25
#define OPT_REMOUNT 26
#define OPT_MAND 27
#define OPT_NOMAND 28
#define OPT_CRUID 29
#define OPT_BKUPUID 30
#define OPT_BKUPGID 31
#define OPT_NOFAIL 32
#define OPT_SNAPSHOT 33
#define MNT_TMP_FILE "/.mtab.cifs.XXXXXX"
#define GMT_NAME_LEN 24 /* length of a @GMT- name */
#define GMT_FORMAT "@GMT-%Y.%m.%d-%H.%M.%S"
#define NTFS_TIME_OFFSET ((unsigned long long)(369*365 + 89) * 24 * 3600 * 10000000)
/*
* struct for holding parsed mount info for use by privileged process.
* Please do not keep pointers in this struct.
* That way, reinit of this struct is a simple memset.
*/
struct parsed_mount_info {
unsigned long flags;
char host[NI_MAXHOST + 1];
char share[MAX_SHARE_LEN + 1];
char prefix[PATH_MAX + 1];
char options[MAX_OPTIONS_LEN];
char domain[MAX_DOMAIN_SIZE + 1];
char username[MAX_USERNAME_SIZE + 1];
char password[MOUNT_PASSWD_SIZE + 1];
char addrlist[MAX_ADDR_LIST_LEN];
unsigned int got_user:1;
unsigned int got_password:1;
unsigned int fakemnt:1;
unsigned int nomtab:1;
unsigned int verboseflag:1;
unsigned int nofail:1;
unsigned int got_domain:1;
unsigned int is_krb5:1;
uid_t sudo_uid;
};
static const char *thisprogram;
static const char *cifs_fstype;
static int parse_unc(const char *unc_name, struct parsed_mount_info *parsed_info, const char *progname);
static int check_setuid(void)
{
if (geteuid()) {
fprintf(stderr, "This program is not installed setuid root - "
" \"user\" CIFS mounts not supported.\n");
return EX_USAGE;
}
#if CIFS_DISABLE_SETUID_CAPABILITY
if (getuid() && !geteuid()) {
printf("This program has been built with the "
"ability to run as a setuid root program disabled.\n");
return EX_USAGE;
}
#endif /* CIFS_DISABLE_SETUID_CAPABILITY */
return 0;
}
static int
check_fstab(const char *progname, const char *mountpoint, const char *devname,
char **options)
{
FILE *fstab;
struct mntent *mnt;
size_t len;
/* make sure this mount is listed in /etc/fstab */
fstab = setmntent(_PATH_MNTTAB, "r");
if (!fstab) {
fprintf(stderr, "Couldn't open %s for reading!\n", _PATH_MNTTAB);
return EX_FILEIO;
}
while ((mnt = getmntent(fstab))) {
len = strlen(mnt->mnt_dir);
while (len > 1) {
if (mnt->mnt_dir[len - 1] == '/')
mnt->mnt_dir[len - 1] = '\0';
else
break;
len--;
}
if (!strcmp(mountpoint, mnt->mnt_dir))
break;
}
endmntent(fstab);
if (mnt == NULL || strcmp(mnt->mnt_fsname, devname)) {
fprintf(stderr, "%s: permission denied: no match for "
"%s found in %s\n", progname, mountpoint, _PATH_MNTTAB);
return EX_USAGE;
}
/*
* 'mount' munges the options from fstab before passing them
* to us. It is non-trivial to test that we have the correct
* set of options. We don't want to trust what the user
* gave us, so just take whatever is in /etc/fstab.
*/
*options = strdup(mnt->mnt_opts);
return 0;
}
/* BB finish BB
cifs_umount
open nofollow - avoid symlink exposure?
get owner of dir see if matches self or if root
call system(umount argv) etc.
BB end finish BB */
static int mount_usage(FILE * stream)
{
fprintf(stream, "\nUsage: %s <remotetarget> <dir> -o <options>\n",
thisprogram);
fprintf(stream, "\nMount the remote target, specified as a UNC name,");
fprintf(stream, " to a local directory.\n\nOptions:\n");
fprintf(stream, "\tuser=<arg>\n\tpass=<arg>\n\tdom=<arg>\n");
fprintf(stream, "\nLess commonly used options:");
fprintf(stream,
"\n\tcredentials=<filename>,guest,perm,noperm,setuids,nosetuids,rw,ro,");
fprintf(stream,
"\n\tsep=<char>,iocharset=<codepage>,suid,nosuid,exec,noexec,serverino,");
fprintf(stream,
"\n\tnoserverino,mapchars,nomapchars,nolock,servernetbiosname=<SRV_RFC1001NAME>");
fprintf(stream,
"\n\tcache=<strict|none|loose>,nounix,cifsacl,sec=<authentication mechanism>,");
fprintf(stream,
"\n\tsign,seal,fsc,snapshot=<token|time>,nosharesock,persistenthandles,");
fprintf(stream,
"\n\tresilienthandles,rdma,vers=<smb_dialect>,cruid");
fprintf(stream,
"\n\nOptions not needed for servers supporting CIFS Unix extensions");
fprintf(stream,
"\n\t(e.g. unneeded for mounts to most Samba versions):");
fprintf(stream,
"\n\tuid=<uid>,gid=<gid>,dir_mode=<mode>,file_mode=<mode>,sfu,");
fprintf(stream,
"\n\tmfsymlinks,idsfromsid");
fprintf(stream, "\n\nRarely used options:");
fprintf(stream,
"\n\tport=<tcpport>,rsize=<size>,wsize=<size>,unc=<unc_name>,ip=<ip_address>,");
fprintf(stream,
"\n\tdev,nodev,nouser_xattr,netbiosname=<OUR_RFC1001NAME>,hard,soft,intr,");
fprintf(stream,
"\n\tnointr,ignorecase,noposixpaths,noacl,prefixpath=<path>,nobrl,");
fprintf(stream,
"\n\techo_interval=<seconds>,actimeo=<seconds>,max_credits=<credits>,");
fprintf(stream,
"\n\tbsize=<size>");
fprintf(stream,
"\n\nOptions are described in more detail in the manual page");
fprintf(stream, "\n\tman 8 %s\n", thisprogram);
fprintf(stream, "\nTo display the version number of the mount helper:");
fprintf(stream, "\n\t%s -V\n", thisprogram);
if (stream == stderr)
return EX_USAGE;
return 0;
}
/*
* CIFS has to "escape" commas in the password field so that they don't
* end up getting confused for option delimiters. Copy password into pw
* field, turning any commas into double commas.
*/
static int set_password(struct parsed_mount_info *parsed_info, const char *src)
{
char *dst = parsed_info->password;
unsigned int i = 0, j = 0;
while (src[i]) {
if (src[i] == ',')
dst[j++] = ',';
dst[j++] = src[i++];
if (j > sizeof(parsed_info->password)) {
fprintf(stderr, "Converted password too long!\n");
return EX_USAGE;
}
}
dst[j] = '\0';
parsed_info->got_password = 1;
return 0;
}
#ifdef HAVE_LIBCAP_NG
static int
drop_capabilities(int parent)
{
capng_select_t set = CAPNG_SELECT_CAPS;
capng_setpid(getpid());
capng_clear(CAPNG_SELECT_BOTH);
if (parent) {
if (capng_updatev(CAPNG_ADD, CAPNG_PERMITTED, CAP_DAC_READ_SEARCH, CAP_DAC_OVERRIDE, -1)) {
fprintf(stderr, "Unable to update capability set.\n");
return EX_SYSERR;
}
if (capng_update(CAPNG_ADD, CAPNG_PERMITTED|CAPNG_EFFECTIVE, CAP_SYS_ADMIN)) {
fprintf(stderr, "Unable to update capability set.\n");
return EX_SYSERR;
}
} else {
if (capng_update(CAPNG_ADD, CAPNG_PERMITTED, CAP_DAC_READ_SEARCH)) {
fprintf(stderr, "Unable to update capability set.\n");
return EX_SYSERR;
}
}
if (capng_have_capability(CAPNG_EFFECTIVE, CAP_SETPCAP)) {
set = CAPNG_SELECT_BOTH;
}
if (capng_apply(set)) {
fprintf(stderr, "Unable to apply new capability set.\n");
return EX_SYSERR;
}
return 0;
}
static int
toggle_dac_capability(int writable, int enable)
{
unsigned int capability = writable ? CAP_DAC_OVERRIDE : CAP_DAC_READ_SEARCH;
if (capng_update(enable ? CAPNG_ADD : CAPNG_DROP, CAPNG_EFFECTIVE, capability)) {
fprintf(stderr, "Unable to update capability set.\n");
return EX_SYSERR;
}
if (capng_apply(CAPNG_SELECT_CAPS)) {
fprintf(stderr, "Unable to apply new capability set.\n");
return EX_SYSERR;
}
return 0;
}
#else /* HAVE_LIBCAP_NG */
#ifdef HAVE_LIBCAP
#ifdef HAVE_PRCTL
static int
prune_bounding_set(void)
{
int i, rc = 0;
static int bounding_set_cleared;
if (bounding_set_cleared)
return 0;
for (i = 0; i <= CAP_LAST_CAP && rc == 0; ++i)
rc = prctl(PR_CAPBSET_DROP, i);
if (rc != 0) {
fprintf(stderr, "Unable to clear capability bounding set: %d\n", rc);
return EX_SYSERR;
}
++bounding_set_cleared;
return 0;
}
#else /* HAVE_PRCTL */
static int
prune_bounding_set(void)
{
return 0;
}
#endif /* HAVE_PRCTL */
static int
drop_capabilities(int parent)
{
int rc, ncaps;
cap_t caps;
cap_value_t cap_list[3];
rc = prune_bounding_set();
if (rc)
return rc;
caps = cap_get_proc();
if (caps == NULL) {
fprintf(stderr, "Unable to get current capability set: %s\n",
strerror(errno));
return EX_SYSERR;
}
if (cap_clear(caps) == -1) {
fprintf(stderr, "Unable to clear capability set: %s\n",
strerror(errno));
rc = EX_SYSERR;
goto free_caps;
}
if (parent || getuid() == 0) {
ncaps = 1;
cap_list[0] = CAP_DAC_READ_SEARCH;
if (parent) {
cap_list[1] = CAP_DAC_OVERRIDE;
cap_list[2] = CAP_SYS_ADMIN;
ncaps += 2;
}
if (cap_set_flag(caps, CAP_PERMITTED, ncaps, cap_list, CAP_SET) == -1) {
fprintf(stderr, "Unable to set permitted capabilities: %s\n",
strerror(errno));
rc = EX_SYSERR;
goto free_caps;
}
if (parent) {
cap_list[0] = CAP_SYS_ADMIN;
if (cap_set_flag(caps, CAP_EFFECTIVE, 1, cap_list, CAP_SET) == -1) {
fprintf(stderr, "Unable to set effective capabilities: %s\n",
strerror(errno));
rc = EX_SYSERR;
goto free_caps;
}
}
}
if (cap_set_proc(caps) != 0) {
fprintf(stderr, "Unable to set current process capabilities: %s\n",
strerror(errno));
rc = EX_SYSERR;
}
free_caps:
cap_free(caps);
return rc;
}
static int
toggle_dac_capability(int writable, int enable)
{
int rc = 0;
cap_t caps;
cap_value_t capability = writable ? CAP_DAC_OVERRIDE : CAP_DAC_READ_SEARCH;
caps = cap_get_proc();
if (caps == NULL) {
fprintf(stderr, "Unable to get current capability set: %s\n",
strerror(errno));
return EX_SYSERR;
}
if (cap_set_flag(caps, CAP_EFFECTIVE, 1, &capability,
enable ? CAP_SET : CAP_CLEAR) == -1) {
fprintf(stderr, "Unable to %s effective capabilities: %s\n",
enable ? "set" : "clear", strerror(errno));
rc = EX_SYSERR;
goto free_caps;
}
if (cap_set_proc(caps) != 0) {
fprintf(stderr, "Unable to set current process capabilities: %s\n",
strerror(errno));
rc = EX_SYSERR;
}
free_caps:
cap_free(caps);
return rc;
}
#else /* HAVE_LIBCAP */
static int
drop_capabilities(int parent __attribute((unused)))
{
return 0;
}
static int
toggle_dac_capability(int writable __attribute((unused)), int enable __attribute((unused)))
{
return 0;
}
#endif /* HAVE_LIBCAP */
#endif /* HAVE_LIBCAP_NG */
static void null_terminate_endl(char *source)
{
char *newline = strchr(source, '\n');
if (newline)
*newline = '\0';
}
/*
* Parse a line from the credentials file. Changes target to first
* character after '=' on 'line' and returns the value type of the line
* Returns CRED_UNPARSEABLE on failure or if either parameter is NULL.
*/
static int parse_cred_line(char *line, char **target)
{
if (line == NULL || target == NULL)
goto parsing_err;
/* position target at first char of value */
*target = strchr(line, '=');
if (!*target)
goto parsing_err;
*target += 1;
/* tell the caller which value target points to */
if (strncasecmp("user", line, 4) == 0)
return CRED_USER;
if (strncasecmp("pass", line, 4) == 0)
return CRED_PASS;
if (strncasecmp("dom", line, 3) == 0)
return CRED_DOM;
parsing_err:
return CRED_UNPARSEABLE;
}
static int open_cred_file(char *file_name,
struct parsed_mount_info *parsed_info)
{
char *line_buf = NULL;
char *temp_val = NULL;
FILE *fs = NULL;
int i;
const int line_buf_size = 4096;
const int min_non_white = 10;
i = toggle_dac_capability(0, 1);
if (i)
goto return_i;
i = access(file_name, R_OK);
if (i) {
toggle_dac_capability(0, 0);
i = errno;
goto return_i;
}
fs = fopen(file_name, "r");
if (fs == NULL) {
toggle_dac_capability(0, 0);
i = errno;
goto return_i;
}
i = toggle_dac_capability(0, 0);
if (i)
goto return_i;
line_buf = (char *)malloc(line_buf_size);
if (line_buf == NULL) {
i = EX_SYSERR;
goto return_i;
}
/* parse line from credentials file */
while (fgets(line_buf, line_buf_size, fs)) {
/* eat leading white space */
for (i = 0; i < line_buf_size - min_non_white + 1; i++) {
if ((line_buf[i] != ' ') && (line_buf[i] != '\t'))
break;
}
null_terminate_endl(line_buf);
/* parse next token */
switch (parse_cred_line(line_buf + i, &temp_val)) {
case CRED_USER:
strlcpy(parsed_info->username, temp_val,
sizeof(parsed_info->username));
parsed_info->got_user = 1;
break;
case CRED_PASS:
i = set_password(parsed_info, temp_val);
if (i)
goto return_i;
break;
case CRED_DOM:
strlcpy(parsed_info->domain, temp_val,
sizeof(parsed_info->domain));
break;
case CRED_UNPARSEABLE:
if (parsed_info->verboseflag)
fprintf(stderr, "Credential formatted "
"incorrectly\n");
break;
}
}
i = 0;
return_i:
if (fs != NULL)
fclose(fs);
/* make sure passwords are scrubbed from memory */
if (line_buf != NULL)
memset(line_buf, 0, line_buf_size);
free(line_buf);
return i;
}
static int
get_password_from_file(int file_descript, char *filename,
struct parsed_mount_info *parsed_info, const char *program)
{
int rc = 0;
char buf[sizeof(parsed_info->password) + 1];
if (filename != NULL) {
rc = toggle_dac_capability(0, 1);
if (rc)
return rc;
rc = access(filename, R_OK);
if (rc) {
fprintf(stderr,
"%s failed: access check of %s failed: %s\n",
program, filename, strerror(errno));
toggle_dac_capability(0, 0);
return EX_SYSERR;
}
file_descript = open(filename, O_RDONLY);
if (file_descript < 0) {
fprintf(stderr,
"%s failed. %s attempting to open password file %s\n",
program, strerror(errno), filename);
toggle_dac_capability(0, 0);
return EX_SYSERR;
}
rc = toggle_dac_capability(0, 0);
if (rc) {
rc = EX_SYSERR;
goto get_pw_exit;
}
}
memset(buf, 0, sizeof(buf));
rc = read(file_descript, buf, sizeof(buf) - 1);
if (rc < 0) {
fprintf(stderr,
"%s failed. Error %s reading password file\n",
program, strerror(errno));
rc = EX_SYSERR;
goto get_pw_exit;
}
rc = set_password(parsed_info, buf);
get_pw_exit:
if (filename != NULL)
close(file_descript);
return rc;
}
/*
* Returns OPT_ERROR on unparsable token.
*/
static int parse_opt_token(const char *token)
{
if (token == NULL)
return OPT_ERROR;
/*
* token is NULL terminated and contains exactly the
* keyword so we can match exactly
*/
if (strcmp(token, "users") == 0)
return OPT_USERS;
if (strcmp(token, "user_xattr") == 0)
return OPT_USER_XATTR;
if (strcmp(token, "user") == 0 ||
strcmp(token, "username") == 0)
return OPT_USER;
if (strcmp(token, "pass") == 0 ||
strcmp(token, "password") == 0)
return OPT_PASS;
if (strcmp(token, "sec") == 0)
return OPT_SEC;
if (strcmp(token, "ip") == 0 ||
strcmp(token, "addr") == 0)
return OPT_IP;
if (strcmp(token, "unc") == 0 ||
strcmp(token, "target") == 0 ||
strcmp(token, "path") == 0)
return OPT_UNC;
if (strcmp(token, "dom") == 0 ||
strcmp(token, "domain") == 0 ||
strcmp(token, "workgroup") == 0)
return OPT_DOM;
if (strcmp(token, "cred") == 0 || /* undocumented */
strcmp(token, "credentials") == 0)
return OPT_CRED;
if (strcmp(token, "uid") == 0)
return OPT_UID;
if (strcmp(token, "cruid") == 0)
return OPT_CRUID;
if (strcmp(token, "gid") == 0)
return OPT_GID;
if (strcmp(token, "fmask") == 0)
return OPT_FMASK;
if (strcmp(token, "file_mode") == 0)
return OPT_FILE_MODE;
if (strcmp(token, "dmask") == 0)
return OPT_DMASK;
if (strcmp(token, "dir_mode") == 0 ||
strcmp(token, "dirm") == 0)
return OPT_DIR_MODE;
if (strcmp(token, "nosuid") == 0)
return OPT_NO_SUID;
if (strcmp(token, "suid") == 0)
return OPT_SUID;
if (strcmp(token, "nodev") == 0)
return OPT_NO_DEV;
if (strcmp(token, "nobrl") == 0 ||
strcmp(token, "nolock") == 0)
return OPT_NO_LOCK;
if (strcmp(token, "mand") == 0)
return OPT_MAND;
if (strcmp(token, "nomand") == 0)
return OPT_NOMAND;
if (strcmp(token, "dev") == 0)
return OPT_DEV;
if (strcmp(token, "noexec") == 0)
return OPT_NO_EXEC;
if (strcmp(token, "exec") == 0)
return OPT_EXEC;
if (strcmp(token, "guest") == 0)
return OPT_GUEST;
if (strcmp(token, "ro") == 0)
return OPT_RO;
if (strcmp(token, "rw") == 0)
return OPT_RW;
if (strcmp(token, "remount") == 0)
return OPT_REMOUNT;
if (strcmp(token, "_netdev") == 0)
return OPT_IGNORE;
if (strcmp(token, "backupuid") == 0)
return OPT_BKUPUID;
if (strcmp(token, "backupgid") == 0)
return OPT_BKUPGID;
if (strcmp(token, "nofail") == 0)
return OPT_NOFAIL;
if (strcmp(token, "comment") == 0)
return OPT_IGNORE;
if (strncmp(token, "x-", 2) == 0)
return OPT_IGNORE;
if (strncmp(token, "snapshot", 8) == 0)
return OPT_SNAPSHOT;
return OPT_ERROR;
}
static int
parse_options(const char *data, struct parsed_mount_info *parsed_info)
{
char *value = NULL;
char *equals = NULL;
char *next_keyword = NULL;
char *out = parsed_info->options;
unsigned long *filesys_flags = &parsed_info->flags;
int out_len = 0;
int word_len;
int rc = 0;
int got_bkupuid = 0;
int got_bkupgid = 0;
int got_uid = 0;
int got_cruid = 0;
int got_gid = 0;
int got_snapshot = 0;
uid_t uid, cruid = 0, bkupuid = 0;
gid_t gid, bkupgid = 0;
char *ep;
struct passwd *pw;
struct group *gr;
/*
* max 64-bit uint in decimal is 18446744073709551615 which is 20 chars
* wide +1 for NULL, and +1 for good measure
*/
char txtbuf[22];
unsigned long long snapshot;
struct tm tm;
/* make sure we're starting from beginning */
out[0] = '\0';
/* BB fixme check for separator override BB */
uid = getuid();
if (uid != 0)
got_uid = 1;
gid = getgid();
if (gid != 0)
got_gid = 1;
if (!data)
return EX_USAGE;
/*
* format is keyword,keyword2=value2,keyword3=value3...
* data = next keyword
* value = next value ie stuff after equal sign
*/
while (data && *data) {
next_keyword = strchr(data, ','); /* BB handle sep= */
/* temporarily null terminate end of keyword=value pair */
if (next_keyword)
*next_keyword++ = 0;
/* temporarily null terminate keyword if there's a value */
value = NULL;
if ((equals = strchr(data, '=')) != NULL) {
*equals = '\0';
value = equals + 1;
}
switch(parse_opt_token(data)) {
case OPT_USERS:
if (!value || !*value) {
*filesys_flags |= MS_USERS;
goto nocopy;
}
break;
case OPT_USER:
if (!value || !*value) {
if (data[4] == '\0') {
*filesys_flags |= MS_USER;
goto nocopy;
} else {
fprintf(stderr,
"username specified with no parameter\n");
return EX_USAGE;
}
} else {
strlcpy(parsed_info->username, value,
sizeof(parsed_info->username));
parsed_info->got_user = 1;
goto nocopy;
}
case OPT_PASS:
if (parsed_info->got_password) {
fprintf(stderr,
"password specified twice, ignoring second\n");
goto nocopy;
}
if (!value || !*value) {
parsed_info->got_password = 1;
goto nocopy;
}
rc = set_password(parsed_info, value);
if (rc)
return rc;
goto nocopy;
case OPT_SEC:
if (value) {
if (!strncmp(value, "none", 4))
parsed_info->got_password = 1;
if (!strncmp(value, "krb5", 4)) {
parsed_info->is_krb5 = 1;
parsed_info->got_password = 1;
}
}
break;
case OPT_IP:
if (!value || !*value) {
fprintf(stderr,
"target ip address argument missing\n");
} else if (strnlen(value, MAX_ADDRESS_LEN) <
MAX_ADDRESS_LEN) {
strlcpy(parsed_info->addrlist, value,
MAX_ADDRESS_LEN);
if (parsed_info->verboseflag)
fprintf(stderr,
"ip address %s override specified\n",
value);
goto nocopy;
} else {
fprintf(stderr, "ip address too long\n");
return EX_USAGE;
}
break;
/* unc || target || path */
case OPT_UNC:
if (!value || !*value) {
fprintf(stderr,
"invalid path to network resource\n");
return EX_USAGE;
}
rc = parse_unc(value, parsed_info, thisprogram);
if (rc)
return rc;
break;
/* dom || workgroup */
case OPT_DOM:
if (!value) {
/*
* An empty domain has been passed
*/
/* not necessary but better safe than.. */
parsed_info->domain[0] = '\0';
parsed_info->got_domain = 1;
goto nocopy;
}
if (strnlen(value, sizeof(parsed_info->domain)) >=
sizeof(parsed_info->domain)) {
fprintf(stderr, "domain name too long\n");
return EX_USAGE;
}
strlcpy(parsed_info->domain, value,
sizeof(parsed_info->domain));
goto nocopy;
case OPT_CRED:
if (!value || !*value) {
fprintf(stderr,
"invalid credential file name specified\n");
return EX_USAGE;
}
rc = open_cred_file(value, parsed_info);
if (rc) {
fprintf(stderr,
"error %d (%s) opening credential file %s\n",
rc, strerror(rc), value);
return rc;
}
goto nocopy;
case OPT_UID:
if (!value || !*value)
goto nocopy;
got_uid = 1;
pw = getpwnam(value);
if (pw) {
uid = pw->pw_uid;
goto nocopy;
}
errno = 0;
uid = strtoul(value, &ep, 10);