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grub/grub-core/commands/legacycfg.c
Vladimir 'phcoder' Serbinenko a38b701cbf Rename jail to extractor
2010-09-20 23:01:34 +02:00

781 lines
19 KiB
C
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/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2000, 2001, 2010 Free Software Foundation, Inc.
*
* GRUB 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.
*
* GRUB 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 GRUB. If not, see <http://www.gnu.org/licenses/>.
*/
#include <grub/types.h>
#include <grub/misc.h>
#include <grub/command.h>
#include <grub/mm.h>
#include <grub/err.h>
#include <grub/dl.h>
#include <grub/file.h>
#include <grub/normal.h>
#include <grub/script_sh.h>
#include <grub/i18n.h>
#include <grub/term.h>
#include <grub/legacy_parse.h>
#include <grub/crypto.h>
#include <grub/auth.h>
#include <grub/disk.h>
#include <grub/partition.h>
static grub_err_t
legacy_file (const char *filename)
{
grub_file_t file;
char *entryname = NULL, *entrysrc = NULL;
grub_menu_t menu;
char *suffix = grub_strdup ("");
auto grub_err_t getline (char **line, int cont);
grub_err_t getline (char **line,
int cont __attribute__ ((unused)))
{
*line = 0;
return GRUB_ERR_NONE;
}
if (!suffix)
return grub_errno;
file = grub_file_open (filename);
if (! file)
return grub_errno;
menu = grub_env_get_menu ();
if (! menu)
{
menu = grub_zalloc (sizeof (*menu));
if (! menu)
return grub_errno;
grub_env_set_menu (menu);
}
while (1)
{
char *buf = grub_file_getline (file);
char *parsed = NULL;
if (!buf && grub_errno)
{
grub_file_close (file);
return grub_errno;
}
if (!buf)
break;
{
char *oldname = NULL;
char *newsuffix;
oldname = entryname;
parsed = grub_legacy_parse (buf, &entryname, &newsuffix);
buf = NULL;
if (newsuffix)
{
char *t;
t = suffix;
suffix = grub_realloc (suffix, grub_strlen (suffix)
+ grub_strlen (newsuffix) + 1);
if (!suffix)
{
grub_free (t);
grub_free (entrysrc);
grub_free (parsed);
grub_free (newsuffix);
grub_free (suffix);
return grub_errno;
}
grub_memcpy (suffix + grub_strlen (suffix), newsuffix,
grub_strlen (newsuffix) + 1);
grub_free (newsuffix);
newsuffix = NULL;
}
if (oldname != entryname && oldname)
{
const char **args = grub_malloc (sizeof (args[0]));
if (!args)
{
grub_file_close (file);
return grub_errno;
}
args[0] = oldname;
grub_normal_add_menu_entry (1, args, NULL, NULL, NULL, NULL,
entrysrc);
grub_free (args);
entrysrc[0] = 0;
grub_free (oldname);
}
}
if (parsed && !entryname)
{
grub_normal_parse_line (parsed, getline);
grub_print_error ();
grub_free (parsed);
parsed = NULL;
}
else if (parsed)
{
if (!entrysrc)
entrysrc = parsed;
else
{
char *t;
t = entrysrc;
entrysrc = grub_realloc (entrysrc, grub_strlen (entrysrc)
+ grub_strlen (parsed) + 1);
if (!entrysrc)
{
grub_free (t);
grub_free (parsed);
grub_free (suffix);
return grub_errno;
}
grub_memcpy (entrysrc + grub_strlen (entrysrc), parsed,
grub_strlen (parsed) + 1);
grub_free (parsed);
parsed = NULL;
}
}
}
grub_file_close (file);
if (entryname)
{
const char **args = grub_malloc (sizeof (args[0]));
if (!args)
{
grub_file_close (file);
return grub_errno;
}
args[0] = entryname;
grub_normal_add_menu_entry (1, args, NULL, NULL, NULL, NULL, entrysrc);
grub_free (args);
}
grub_normal_parse_line (suffix, getline);
grub_print_error ();
grub_free (suffix);
grub_free (entrysrc);
if (menu && menu->size)
grub_show_menu (menu, 1);
return GRUB_ERR_NONE;
}
static grub_err_t
grub_cmd_legacy_source (struct grub_command *cmd __attribute__ ((unused)),
int argc, char **args)
{
if (argc != 1)
return grub_error (GRUB_ERR_BAD_ARGUMENT, "file name required");
return legacy_file (args[0]);
}
static grub_err_t
grub_cmd_legacy_configfile (struct grub_command *cmd __attribute__ ((unused)),
int argc, char **args)
{
grub_err_t ret;
if (argc != 1)
return grub_error (GRUB_ERR_BAD_ARGUMENT, "file name required");
grub_cls ();
grub_env_context_open ();
ret = legacy_file (args[0]);
grub_env_context_close ();
return ret;
}
static enum
{
GUESS_IT, LINUX, MULTIBOOT, KFREEBSD, KNETBSD, KOPENBSD
} kernel_type;
static grub_err_t
grub_cmd_legacy_kernel (struct grub_command *mycmd __attribute__ ((unused)),
int argc, char **args)
{
int i;
int no_mem_option = 0;
struct grub_command *cmd;
char **cutargs;
int cutargc;
for (i = 0; i < 2; i++)
{
/* FIXME: really support this. */
if (argc >= 1 && grub_strcmp (args[0], "--no-mem-option") == 0)
{
no_mem_option = 1;
argc--;
args++;
continue;
}
/* linux16 handles both zImages and bzImages. */
if (argc >= 1 && (grub_strcmp (args[0], "--type=linux") == 0
|| grub_strcmp (args[0], "--type=biglinux") == 0))
{
kernel_type = LINUX;
argc--;
args++;
continue;
}
if (argc >= 1 && grub_strcmp (args[0], "--type=multiboot") == 0)
{
kernel_type = MULTIBOOT;
argc--;
args++;
continue;
}
if (argc >= 1 && grub_strcmp (args[0], "--type=freebsd") == 0)
{
kernel_type = KFREEBSD;
argc--;
args++;
continue;
}
if (argc >= 1 && grub_strcmp (args[0], "--type=openbsd") == 0)
{
kernel_type = KOPENBSD;
argc--;
args++;
continue;
}
if (argc >= 1 && grub_strcmp (args[0], "--type=netbsd") == 0)
{
kernel_type = KNETBSD;
argc--;
args++;
continue;
}
}
if (argc < 2)
return grub_error (GRUB_ERR_BAD_ARGUMENT, "filename required");
cutargs = grub_malloc (sizeof (cutargs[0]) * (argc - 1));
cutargc = argc - 1;
grub_memcpy (cutargs + 1, args + 2, sizeof (cutargs[0]) * (argc - 2));
cutargs[0] = args[0];
do
{
/* First try Linux. */
if (kernel_type == GUESS_IT || kernel_type == LINUX)
{
cmd = grub_command_find ("linux16");
if (cmd)
{
if (!(cmd->func) (cmd, cutargc, cutargs))
{
kernel_type = LINUX;
return GRUB_ERR_NONE;
}
}
grub_errno = GRUB_ERR_NONE;
}
/* Then multiboot. */
if (kernel_type == GUESS_IT || kernel_type == MULTIBOOT)
{
cmd = grub_command_find ("multiboot");
if (cmd)
{
if (!(cmd->func) (cmd, argc, args))
{
kernel_type = MULTIBOOT;
return GRUB_ERR_NONE;
}
}
grub_errno = GRUB_ERR_NONE;
}
{
int bsd_device = -1;
int bsd_slice = -1;
int bsd_part = -1;
{
grub_device_t dev;
char *hdbiasstr;
int hdbias = 0;
hdbiasstr = grub_env_get ("legacy_hdbias");
if (hdbiasstr)
{
hdbias = grub_strtoul (hdbiasstr, 0, 0);
grub_errno = GRUB_ERR_NONE;
}
dev = grub_device_open (0);
if (dev && dev->disk
&& dev->disk->dev->id == GRUB_DISK_DEVICE_BIOSDISK_ID
&& dev->disk->dev->id >= 0x80 && dev->disk->dev->id <= 0x90)
{
struct grub_partition *part = dev->disk->partition;
bsd_device = dev->disk->id - 0x80 - hdbias;
if (part && (grub_strcmp (part->partmap->name, "netbsd") == 0
|| grub_strcmp (part->partmap->name, "openbsd") == 0
|| grub_strcmp (part->partmap->name, "bsd") == 0))
{
bsd_part = part->number;
part = part->parent;
}
if (part && grub_strcmp (part->partmap->name, "msdos") == 0)
bsd_slice = part->number;
}
}
/* k*BSD didn't really work well with grub-legacy. */
if (kernel_type == GUESS_IT || kernel_type == KFREEBSD)
{
char buf[sizeof("adXXXXXXXXXXXXsXXXXXXXXXXXXYYY")];
if (bsd_device != -1)
{
if (bsd_slice != -1 && bsd_part != -1)
grub_snprintf(buf, sizeof(buf), "ad%ds%d%c", bsd_device,
bsd_slice, 'a' + bsd_part);
else if (bsd_slice != -1)
grub_snprintf(buf, sizeof(buf), "ad%ds%d", bsd_device,
bsd_slice);
else
grub_snprintf(buf, sizeof(buf), "ad%d", bsd_device);
grub_env_set ("kFreeBSD.vfs.root.mountfrom", buf);
}
else
grub_env_unset ("kFreeBSD.vfs.root.mountfrom");
cmd = grub_command_find ("kfreebsd");
if (cmd)
{
if (!(cmd->func) (cmd, cutargc, cutargs))
{
kernel_type = KFREEBSD;
return GRUB_ERR_NONE;
}
}
grub_errno = GRUB_ERR_NONE;
}
{
char **bsdargs;
int bsdargc;
char bsddevname[sizeof ("wdXXXXXXXXXXXXY")];
if (bsd_device == -1)
{
bsdargs = cutargs;
bsdargc = cutargc;
}
else
{
bsdargc = cutargc + 2;
bsdargs = grub_malloc (sizeof (bsdargs[0]) * bsdargc);
grub_memcpy (bsdargs, args, argc * sizeof (bsdargs[0]));
bsdargs[argc] = "-r";
bsdargs[argc + 1] = bsddevname;
grub_snprintf (bsddevname, sizeof (bsddevname),
"wd%d%c", bsd_device,
bsd_part != -1 ? bsd_part + 'a' : 'c');
}
if (kernel_type == GUESS_IT || kernel_type == KNETBSD)
{
cmd = grub_command_find ("knetbsd");
if (cmd)
{
if (!(cmd->func) (cmd, bsdargc, bsdargs))
{
kernel_type = KNETBSD;
return GRUB_ERR_NONE;
}
}
grub_errno = GRUB_ERR_NONE;
}
if (kernel_type == GUESS_IT || kernel_type == KOPENBSD)
{
cmd = grub_command_find ("kopenbsd");
if (cmd)
{
if (!(cmd->func) (cmd, bsdargc, bsdargs))
{
kernel_type = KOPENBSD;
return GRUB_ERR_NONE;
}
}
grub_errno = GRUB_ERR_NONE;
}
if (bsdargs != cutargs)
grub_free (bsdargs);
}
}
}
while (0);
return grub_error (GRUB_ERR_BAD_OS, "couldn't load file %s\n",
args[0]);
}
static grub_err_t
grub_cmd_legacy_initrd (struct grub_command *mycmd __attribute__ ((unused)),
int argc, char **args)
{
struct grub_command *cmd;
if (kernel_type == LINUX)
{
cmd = grub_command_find ("initrd16");
if (!cmd)
return grub_error (GRUB_ERR_BAD_ARGUMENT, "command initrd16 not found");
return cmd->func (cmd, argc, args);
}
if (kernel_type == MULTIBOOT)
{
cmd = grub_command_find ("module");
if (!cmd)
return grub_error (GRUB_ERR_BAD_ARGUMENT, "command module not found");
return cmd->func (cmd, argc, args);
}
return grub_error (GRUB_ERR_BAD_ARGUMENT,
"no kernel with module support is loaded in legacy way");
}
static grub_err_t
grub_cmd_legacy_initrdnounzip (struct grub_command *mycmd __attribute__ ((unused)),
int argc, char **args)
{
struct grub_command *cmd;
if (kernel_type == LINUX)
{
cmd = grub_command_find ("initrd16");
if (!cmd)
return grub_error (GRUB_ERR_BAD_ARGUMENT, "command initrd16 not found");
return cmd->func (cmd, argc, args);
}
if (kernel_type == MULTIBOOT)
{
char **newargs;
grub_err_t err;
newargs = grub_malloc ((argc + 1) * sizeof (newargs[0]));
if (!newargs)
return grub_errno;
grub_memcpy (newargs + 1, args, argc * sizeof (newargs[0]));
newargs[0] = "--nounzip";
cmd = grub_command_find ("module");
if (!cmd)
return grub_error (GRUB_ERR_BAD_ARGUMENT, "command module not found");
err = cmd->func (cmd, argc + 1, newargs);
grub_free (newargs);
return err;
}
return grub_error (GRUB_ERR_BAD_ARGUMENT,
"no kernel with module support is loaded in legacy way");
}
static grub_err_t
check_password_deny (const char *user __attribute__ ((unused)),
const char *entered __attribute__ ((unused)),
void *password __attribute__ ((unused)))
{
return GRUB_ACCESS_DENIED;
}
#define MD5_HASHLEN 16
struct legacy_md5_password
{
grub_uint8_t *salt;
int saltlen;
grub_uint8_t hash[MD5_HASHLEN];
};
static int
check_password_md5_real (const char *entered,
struct legacy_md5_password *pw)
{
int enteredlen = grub_strlen (entered);
unsigned char alt_result[MD5_HASHLEN];
unsigned char *digest;
grub_uint8_t ctx[GRUB_MD_MD5->contextsize];
int i;
GRUB_MD_MD5->init (ctx);
GRUB_MD_MD5->write (ctx, entered, enteredlen);
GRUB_MD_MD5->write (ctx, pw->salt + 3, pw->saltlen - 3);
GRUB_MD_MD5->write (ctx, entered, enteredlen);
digest = GRUB_MD_MD5->read (ctx);
GRUB_MD_MD5->final (ctx);
memcpy (alt_result, digest, MD5_HASHLEN);
GRUB_MD_MD5->init (ctx);
GRUB_MD_MD5->write (ctx, entered, enteredlen);
GRUB_MD_MD5->write (ctx, pw->salt, pw->saltlen); /* include the $1$ header */
for (i = enteredlen; i > 16; i -= 16)
GRUB_MD_MD5->write (ctx, alt_result, 16);
GRUB_MD_MD5->write (ctx, alt_result, i);
for (i = enteredlen; i > 0; i >>= 1)
GRUB_MD_MD5->write (ctx, entered + ((i & 1) ? enteredlen : 0), 1);
digest = GRUB_MD_MD5->read (ctx);
GRUB_MD_MD5->final (ctx);
for (i = 0; i < 1000; i++)
{
memcpy (alt_result, digest, 16);
GRUB_MD_MD5->init (ctx);
if ((i & 1) != 0)
GRUB_MD_MD5->write (ctx, entered, enteredlen);
else
GRUB_MD_MD5->write (ctx, alt_result, 16);
if (i % 3 != 0)
GRUB_MD_MD5->write (ctx, pw->salt + 3, pw->saltlen - 3);
if (i % 7 != 0)
GRUB_MD_MD5->write (ctx, entered, enteredlen);
if ((i & 1) != 0)
GRUB_MD_MD5->write (ctx, alt_result, 16);
else
GRUB_MD_MD5->write (ctx, entered, enteredlen);
digest = GRUB_MD_MD5->read (ctx);
GRUB_MD_MD5->final (ctx);
}
return (grub_crypto_memcmp (digest, pw->hash, MD5_HASHLEN) == 0);
}
static grub_err_t
check_password_md5 (const char *user,
const char *entered,
void *password)
{
if (!check_password_md5_real (entered, password))
return GRUB_ACCESS_DENIED;
grub_auth_authenticate (user);
return GRUB_ERR_NONE;
}
static inline int
ib64t (char c)
{
if (c == '.')
return 0;
if (c == '/')
return 1;
if (c >= '0' && c <= '9')
return c - '0' + 2;
if (c >= 'A' && c <= 'Z')
return c - 'A' + 12;
if (c >= 'a' && c <= 'z')
return c - 'a' + 38;
return -1;
}
static struct legacy_md5_password *
parse_legacy_md5 (int argc, char **args)
{
const char *salt, *saltend;
struct legacy_md5_password *pw = NULL;
int i;
const char *p;
if (grub_memcmp (args[0], "--md5", sizeof ("--md5")) != 0)
goto fail;
if (argc == 1)
goto fail;
if (grub_strlen(args[1]) <= 3)
goto fail;
salt = args[1];
saltend = grub_strchr (salt + 3, '$');
if (!saltend)
goto fail;
pw = grub_malloc (sizeof (*pw));
if (!pw)
goto fail;
p = saltend + 1;
for (i = 0; i < 5; i++)
{
int n;
grub_uint32_t w = 0;
for (n = 0; n < 4; n++)
{
int ww = ib64t(*p++);
if (ww == -1)
goto fail;
w |= ww << (n * 6);
}
pw->hash[i == 4 ? 5 : 12+i] = w & 0xff;
pw->hash[6+i] = (w >> 8) & 0xff;
pw->hash[i] = (w >> 16) & 0xff;
}
{
int n;
grub_uint32_t w = 0;
for (n = 0; n < 2; n++)
{
int ww = ib64t(*p++);
if (ww == -1)
goto fail;
w |= ww << (6 * n);
}
if (w >= 0x100)
goto fail;
pw->hash[11] = w;
}
pw->saltlen = saltend - salt;
pw->salt = (grub_uint8_t *) grub_strndup (salt, pw->saltlen);
if (!pw->salt)
goto fail;
return pw;
fail:
grub_free (pw);
return NULL;
}
static grub_err_t
grub_cmd_legacy_password (struct grub_command *mycmd __attribute__ ((unused)),
int argc, char **args)
{
struct legacy_md5_password *pw = NULL;
if (argc == 0)
return grub_error (GRUB_ERR_BAD_ARGUMENT, "arguments expected");
if (args[0][0] != '-' || args[0][1] != '-')
return grub_normal_set_password ("legacy", args[0]);
pw = parse_legacy_md5 (argc, args);
if (pw)
return grub_auth_register_authentication ("legacy", check_password_md5, pw);
else
/* This is to imitate minor difference between grub-legacy in GRUB2.
If 2 password commands are executed in a row and second one fails
on GRUB2 the password of first one is used, whereas in grub-legacy
authenthication is denied. In case of no password command was executed
early both versions deny any access. */
return grub_auth_register_authentication ("legacy", check_password_deny,
NULL);
}
static grub_err_t
grub_cmd_legacy_check_password (struct grub_command *mycmd __attribute__ ((unused)),
int argc, char **args)
{
struct legacy_md5_password *pw = NULL;
char entered[GRUB_AUTH_MAX_PASSLEN];
if (argc == 0)
return grub_error (GRUB_ERR_BAD_ARGUMENT, "arguments expected");
grub_printf ("Enter password:");
if (!grub_password_get (entered, GRUB_AUTH_MAX_PASSLEN))
return GRUB_ACCESS_DENIED;
if (args[0][0] != '-' || args[0][1] != '-')
{
char correct[GRUB_AUTH_MAX_PASSLEN];
grub_memset (correct, 0, sizeof (correct));
grub_strncpy (correct, args[0], sizeof (correct));
if (grub_crypto_memcmp (entered, correct, GRUB_AUTH_MAX_PASSLEN) != 0)
return GRUB_ACCESS_DENIED;
return GRUB_ERR_NONE;
}
pw = parse_legacy_md5 (argc, args);
if (!pw)
return GRUB_ACCESS_DENIED;
if (!check_password_md5_real (entered, pw))
return GRUB_ACCESS_DENIED;
return GRUB_ERR_NONE;
}
static grub_command_t cmd_source, cmd_configfile, cmd_kernel, cmd_initrd;
static grub_command_t cmd_password, cmd_check_password, cmd_initrdnounzip;
GRUB_MOD_INIT(legacycfg)
{
cmd_source = grub_register_command ("legacy_source",
grub_cmd_legacy_source,
N_("FILE"), N_("Parse legacy config"));
cmd_configfile = grub_register_command ("legacy_configfile",
grub_cmd_legacy_configfile,
N_("FILE"),
N_("Parse legacy config"));
cmd_kernel = grub_register_command ("legacy_kernel",
grub_cmd_legacy_kernel,
N_("[--no-mem-option] [--type=TYPE] FILE [ARG ...]"),
N_("Simulate grub-legacy kernel command"));
cmd_initrd = grub_register_command ("legacy_initrd",
grub_cmd_legacy_initrd,
N_("FILE [ARG ...]"),
N_("Simulate grub-legacy initrd command"));
cmd_initrdnounzip = grub_register_command ("legacy_initrd_nounzip",
grub_cmd_legacy_initrdnounzip,
N_("FILE [ARG ...]"),
N_("Simulate grub-legacy modulenounzip command"));
cmd_password = grub_register_command ("legacy_password",
grub_cmd_legacy_password,
N_("[--md5] PASSWD [FILE]"),
N_("Simulate grub-legacy password command"));
cmd_check_password = grub_register_command ("legacy_check_password",
grub_cmd_legacy_check_password,
N_("[--md5] PASSWD [FILE]"),
N_("Simulate grub-legacy password command in menuentry mode"));
}
GRUB_MOD_FINI(legacycfg)
{
grub_unregister_command (cmd_source);
grub_unregister_command (cmd_configfile);
grub_unregister_command (cmd_kernel);
grub_unregister_command (cmd_initrd);
grub_unregister_command (cmd_initrdnounzip);
grub_unregister_command (cmd_password);
grub_unregister_command (cmd_check_password);
}
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