4f84ae0ec8
We have only 92K of stack and using over 4K per frame is wasteful * grub-core/commands/verify.c (grub_load_public_key): Allocate on heap rather than stack. (grub_verify_signature_real): Likewise.
969 lines
24 KiB
C
969 lines
24 KiB
C
/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2013 Free Software Foundation, Inc.
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*
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* GRUB is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* GRUB is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <grub/types.h>
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#include <grub/misc.h>
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#include <grub/mm.h>
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#include <grub/err.h>
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#include <grub/dl.h>
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#include <grub/file.h>
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#include <grub/command.h>
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#include <grub/crypto.h>
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#include <grub/i18n.h>
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#include <grub/gcrypt/gcrypt.h>
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#include <grub/pubkey.h>
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#include <grub/env.h>
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#include <grub/kernel.h>
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#include <grub/extcmd.h>
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GRUB_MOD_LICENSE ("GPLv3+");
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enum
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{
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OPTION_SKIP_SIG = 0
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};
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static const struct grub_arg_option options[] =
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{
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{"skip-sig", 's', 0,
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N_("Skip signature-checking of the signature file."), 0, ARG_TYPE_NONE},
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{0, 0, 0, 0, 0, 0}
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};
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static grub_err_t
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read_packet_header (grub_file_t sig, grub_uint8_t *out_type, grub_size_t *len)
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{
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grub_uint8_t type;
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grub_uint8_t l;
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grub_uint16_t l16;
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grub_uint32_t l32;
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/* New format. */
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switch (grub_file_read (sig, &type, sizeof (type)))
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{
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case 1:
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break;
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case 0:
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{
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*out_type = 0xff;
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return 0;
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}
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default:
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if (grub_errno)
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return grub_errno;
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/* TRANSLATORS: it's about GNUPG signatures. */
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return grub_error (GRUB_ERR_BAD_SIGNATURE, N_("bad signature"));
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}
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if (type == 0)
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{
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*out_type = 0xfe;
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return 0;
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}
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if (!(type & 0x80))
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return grub_error (GRUB_ERR_BAD_SIGNATURE, N_("bad signature"));
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if (type & 0x40)
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{
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*out_type = (type & 0x3f);
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if (grub_file_read (sig, &l, sizeof (l)) != 1)
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return grub_error (GRUB_ERR_BAD_SIGNATURE, N_("bad signature"));
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if (l < 192)
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{
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*len = l;
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return 0;
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}
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if (l < 224)
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{
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*len = (l - 192) << GRUB_CHAR_BIT;
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if (grub_file_read (sig, &l, sizeof (l)) != 1)
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return grub_error (GRUB_ERR_BAD_SIGNATURE, N_("bad signature"));
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*len |= l;
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return 0;
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}
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if (l == 255)
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{
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if (grub_file_read (sig, &l32, sizeof (l32)) != sizeof (l32))
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return grub_error (GRUB_ERR_BAD_SIGNATURE, N_("bad signature"));
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*len = grub_be_to_cpu32 (l32);
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return 0;
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}
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return grub_error (GRUB_ERR_BAD_SIGNATURE, N_("bad signature"));
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}
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*out_type = ((type >> 2) & 0xf);
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switch (type & 0x3)
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{
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case 0:
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if (grub_file_read (sig, &l, sizeof (l)) != sizeof (l))
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return grub_error (GRUB_ERR_BAD_SIGNATURE, N_("bad signature"));
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*len = l;
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return 0;
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case 1:
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if (grub_file_read (sig, &l16, sizeof (l16)) != sizeof (l16))
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return grub_error (GRUB_ERR_BAD_SIGNATURE, N_("bad signature"));
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*len = grub_be_to_cpu16 (l16);
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return 0;
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case 2:
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if (grub_file_read (sig, &l32, sizeof (l32)) != sizeof (l32))
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return grub_error (GRUB_ERR_BAD_SIGNATURE, N_("bad signature"));
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*len = grub_be_to_cpu32 (l32);
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return 0;
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}
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return grub_error (GRUB_ERR_BAD_SIGNATURE, N_("bad signature"));
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}
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struct signature_v4_header
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{
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grub_uint8_t type;
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grub_uint8_t pkeyalgo;
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grub_uint8_t hash;
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grub_uint16_t hashed_sub;
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} __attribute__ ((packed));
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const char *hashes[] = {
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[0x01] = "md5",
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[0x02] = "sha1",
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[0x03] = "ripemd160",
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[0x08] = "sha256",
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[0x09] = "sha384",
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[0x0a] = "sha512",
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[0x0b] = "sha224"
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};
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struct gcry_pk_spec *grub_crypto_pk_dsa;
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struct gcry_pk_spec *grub_crypto_pk_ecdsa;
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struct gcry_pk_spec *grub_crypto_pk_rsa;
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static int
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dsa_pad (gcry_mpi_t *hmpi, grub_uint8_t *hval,
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const gcry_md_spec_t *hash, struct grub_public_subkey *sk);
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static int
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rsa_pad (gcry_mpi_t *hmpi, grub_uint8_t *hval,
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const gcry_md_spec_t *hash, struct grub_public_subkey *sk);
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struct
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{
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const char *name;
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grub_size_t nmpisig;
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grub_size_t nmpipub;
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struct gcry_pk_spec **algo;
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int (*pad) (gcry_mpi_t *hmpi, grub_uint8_t *hval,
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const gcry_md_spec_t *hash, struct grub_public_subkey *sk);
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const char *module;
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} pkalgos[] =
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{
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[1] = { "rsa", 1, 2, &grub_crypto_pk_rsa, rsa_pad, "gcry_rsa" },
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[3] = { "rsa", 1, 2, &grub_crypto_pk_rsa, rsa_pad, "gcry_rsa" },
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[17] = { "dsa", 2, 4, &grub_crypto_pk_dsa, dsa_pad, "gcry_dsa" },
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};
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struct grub_public_key
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{
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struct grub_public_key *next;
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struct grub_public_subkey *subkeys;
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};
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struct grub_public_subkey
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{
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struct grub_public_subkey *next;
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grub_uint8_t type;
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grub_uint32_t fingerprint[5];
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gcry_mpi_t mpis[10];
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};
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static void
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free_pk (struct grub_public_key *pk)
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{
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struct grub_public_subkey *nsk, *sk;
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for (sk = pk->subkeys; sk; sk = nsk)
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{
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nsk = sk->next;
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grub_free (sk);
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}
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grub_free (pk);
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}
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#define READBUF_SIZE 4096
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struct grub_public_key *
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grub_load_public_key (grub_file_t f)
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{
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grub_err_t err;
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struct grub_public_key *ret;
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struct grub_public_subkey **last = 0;
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void *fingerprint_context = NULL;
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grub_uint8_t *buffer = NULL;
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ret = grub_zalloc (sizeof (*ret));
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if (!ret)
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{
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grub_free (fingerprint_context);
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return NULL;
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}
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buffer = grub_zalloc (READBUF_SIZE);
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fingerprint_context = grub_zalloc (GRUB_MD_SHA1->contextsize);
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if (!buffer || !fingerprint_context)
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goto fail;
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last = &ret->subkeys;
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while (1)
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{
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grub_uint8_t type;
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grub_size_t len;
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grub_uint8_t v, pk;
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grub_uint32_t creation_time;
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grub_off_t pend;
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struct grub_public_subkey *sk;
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grub_size_t i;
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grub_uint16_t len_be;
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err = read_packet_header (f, &type, &len);
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if (err)
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goto fail;
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if (type == 0xfe)
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continue;
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if (type == 0xff)
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{
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grub_free (fingerprint_context);
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return ret;
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}
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grub_dprintf ("crypt", "len = %x\n", (int) len);
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pend = grub_file_tell (f) + len;
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if (type != 6 && type != 14
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&& type != 5 && type != 7)
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{
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grub_file_seek (f, pend);
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continue;
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}
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if (grub_file_read (f, &v, sizeof (v)) != sizeof (v))
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{
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grub_error (GRUB_ERR_BAD_SIGNATURE, N_("bad signature"));
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goto fail;
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}
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grub_dprintf ("crypt", "v = %x\n", v);
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if (v != 4)
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{
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grub_error (GRUB_ERR_BAD_SIGNATURE, N_("bad signature"));
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goto fail;
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}
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if (grub_file_read (f, &creation_time, sizeof (creation_time)) != sizeof (creation_time))
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{
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grub_error (GRUB_ERR_BAD_SIGNATURE, N_("bad signature"));
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goto fail;
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}
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grub_dprintf ("crypt", "time = %x\n", creation_time);
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if (grub_file_read (f, &pk, sizeof (pk)) != sizeof (pk))
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{
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grub_error (GRUB_ERR_BAD_SIGNATURE, N_("bad signature"));
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goto fail;
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}
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grub_dprintf ("crypt", "pk = %x\n", pk);
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if (pk >= ARRAY_SIZE (pkalgos) || pkalgos[pk].name == NULL)
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{
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grub_file_seek (f, pend);
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continue;
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}
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sk = grub_zalloc (sizeof (struct grub_public_subkey));
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if (!sk)
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goto fail;
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grub_memset (fingerprint_context, 0, sizeof (fingerprint_context));
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GRUB_MD_SHA1->init (fingerprint_context);
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GRUB_MD_SHA1->write (fingerprint_context, "\x99", 1);
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len_be = grub_cpu_to_be16 (len);
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GRUB_MD_SHA1->write (fingerprint_context, &len_be, sizeof (len_be));
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GRUB_MD_SHA1->write (fingerprint_context, &v, sizeof (v));
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GRUB_MD_SHA1->write (fingerprint_context, &creation_time, sizeof (creation_time));
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GRUB_MD_SHA1->write (fingerprint_context, &pk, sizeof (pk));
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for (i = 0; i < pkalgos[pk].nmpipub; i++)
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{
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grub_uint16_t l;
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grub_size_t lb;
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if (grub_file_read (f, &l, sizeof (l)) != sizeof (l))
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{
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grub_error (GRUB_ERR_BAD_SIGNATURE, N_("bad signature"));
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goto fail;
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}
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lb = (grub_be_to_cpu16 (l) + GRUB_CHAR_BIT - 1) / GRUB_CHAR_BIT;
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if (lb > READBUF_SIZE - sizeof (grub_uint16_t))
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{
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grub_error (GRUB_ERR_BAD_SIGNATURE, N_("bad signature"));
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goto fail;
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}
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if (grub_file_read (f, buffer + sizeof (grub_uint16_t), lb) != (grub_ssize_t) lb)
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{
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grub_error (GRUB_ERR_BAD_SIGNATURE, N_("bad signature"));
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goto fail;
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}
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grub_memcpy (buffer, &l, sizeof (l));
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GRUB_MD_SHA1->write (fingerprint_context, buffer, lb + sizeof (grub_uint16_t));
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if (gcry_mpi_scan (&sk->mpis[i], GCRYMPI_FMT_PGP,
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buffer, lb + sizeof (grub_uint16_t), 0))
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{
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grub_error (GRUB_ERR_BAD_SIGNATURE, N_("bad signature"));
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goto fail;
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}
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}
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GRUB_MD_SHA1->final (fingerprint_context);
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grub_memcpy (sk->fingerprint, GRUB_MD_SHA1->read (fingerprint_context), 20);
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*last = sk;
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last = &sk->next;
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grub_dprintf ("crypt", "actual pos: %x, expected: %x\n", (int)grub_file_tell (f), (int)pend);
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grub_file_seek (f, pend);
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}
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fail:
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free_pk (ret);
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grub_free (fingerprint_context);
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grub_free (buffer);
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return NULL;
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}
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struct grub_public_key *grub_pk_trusted;
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struct grub_public_subkey *
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grub_crypto_pk_locate_subkey (grub_uint64_t keyid, struct grub_public_key *pkey)
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{
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struct grub_public_subkey *sk;
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for (sk = pkey->subkeys; sk; sk = sk->next)
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if (grub_memcmp (sk->fingerprint + 3, &keyid, 8) == 0)
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return sk;
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return 0;
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}
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struct grub_public_subkey *
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grub_crypto_pk_locate_subkey_in_trustdb (grub_uint64_t keyid)
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{
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struct grub_public_key *pkey;
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struct grub_public_subkey *sk;
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for (pkey = grub_pk_trusted; pkey; pkey = pkey->next)
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{
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sk = grub_crypto_pk_locate_subkey (keyid, pkey);
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if (sk)
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return sk;
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}
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return 0;
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}
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static int
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dsa_pad (gcry_mpi_t *hmpi, grub_uint8_t *hval,
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const gcry_md_spec_t *hash, struct grub_public_subkey *sk)
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{
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unsigned nbits = gcry_mpi_get_nbits (sk->mpis[1]);
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grub_dprintf ("crypt", "must be %u bits got %d bits\n", nbits,
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(int)(8 * hash->mdlen));
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return gcry_mpi_scan (hmpi, GCRYMPI_FMT_USG, hval,
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nbits / 8 < (unsigned) hash->mdlen ? nbits / 8
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: (unsigned) hash->mdlen, 0);
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}
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static int
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rsa_pad (gcry_mpi_t *hmpi, grub_uint8_t *hval,
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const gcry_md_spec_t *hash, struct grub_public_subkey *sk)
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{
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grub_size_t tlen, emlen, fflen;
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grub_uint8_t *em, *emptr;
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unsigned nbits = gcry_mpi_get_nbits (sk->mpis[0]);
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int ret;
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tlen = hash->mdlen + hash->asnlen;
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emlen = (nbits + 7) / 8;
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if (emlen < tlen + 11)
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return 1;
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em = grub_malloc (emlen);
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if (!em)
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return 1;
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em[0] = 0x00;
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em[1] = 0x01;
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fflen = emlen - tlen - 3;
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for (emptr = em + 2; emptr < em + 2 + fflen; emptr++)
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*emptr = 0xff;
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*emptr++ = 0x00;
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grub_memcpy (emptr, hash->asnoid, hash->asnlen);
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emptr += hash->asnlen;
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grub_memcpy (emptr, hval, hash->mdlen);
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ret = gcry_mpi_scan (hmpi, GCRYMPI_FMT_USG, em, emlen, 0);
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grub_free (em);
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return ret;
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}
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static grub_err_t
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grub_verify_signature_real (char *buf, grub_size_t size,
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grub_file_t f, grub_file_t sig,
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struct grub_public_key *pkey)
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{
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grub_size_t len;
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grub_uint8_t v;
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grub_uint8_t h;
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grub_uint8_t t;
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grub_uint8_t pk;
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const gcry_md_spec_t *hash;
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struct signature_v4_header v4;
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grub_err_t err;
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grub_size_t i;
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gcry_mpi_t mpis[10];
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grub_uint8_t type;
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err = read_packet_header (sig, &type, &len);
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if (err)
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return err;
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if (type != 0x2)
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return grub_error (GRUB_ERR_BAD_SIGNATURE, N_("bad signature"));
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if (grub_file_read (sig, &v, sizeof (v)) != sizeof (v))
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return grub_error (GRUB_ERR_BAD_SIGNATURE, N_("bad signature"));
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if (v != 4)
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return grub_error (GRUB_ERR_BAD_SIGNATURE, N_("bad signature"));
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if (grub_file_read (sig, &v4, sizeof (v4)) != sizeof (v4))
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return grub_error (GRUB_ERR_BAD_SIGNATURE, N_("bad signature"));
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h = v4.hash;
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t = v4.type;
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pk = v4.pkeyalgo;
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if (t != 0)
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return grub_error (GRUB_ERR_BAD_SIGNATURE, N_("bad signature"));
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if (h >= ARRAY_SIZE (hashes) || hashes[h] == NULL)
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return grub_error (GRUB_ERR_BAD_SIGNATURE, "unknown hash");
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if (pk >= ARRAY_SIZE (pkalgos) || pkalgos[pk].name == NULL)
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return grub_error (GRUB_ERR_BAD_SIGNATURE, N_("bad signature"));
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hash = grub_crypto_lookup_md_by_name (hashes[h]);
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if (!hash)
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return grub_error (GRUB_ERR_BAD_SIGNATURE, "hash `%s' not loaded", hashes[h]);
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grub_dprintf ("crypt", "alive\n");
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{
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void *context = NULL;
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unsigned char *hval;
|
|
grub_ssize_t rem = grub_be_to_cpu16 (v4.hashed_sub);
|
|
grub_uint32_t headlen = grub_cpu_to_be32 (rem + 6);
|
|
grub_uint8_t s;
|
|
grub_uint16_t unhashed_sub;
|
|
grub_ssize_t r;
|
|
grub_uint8_t hash_start[2];
|
|
gcry_mpi_t hmpi;
|
|
grub_uint64_t keyid = 0;
|
|
struct grub_public_subkey *sk;
|
|
grub_uint8_t *readbuf = NULL;
|
|
|
|
context = grub_zalloc (hash->contextsize);
|
|
readbuf = grub_zalloc (READBUF_SIZE);
|
|
if (!context || !readbuf)
|
|
goto fail;
|
|
|
|
hash->init (context);
|
|
if (buf)
|
|
hash->write (context, buf, size);
|
|
else
|
|
while (1)
|
|
{
|
|
r = grub_file_read (f, readbuf, READBUF_SIZE);
|
|
if (r < 0)
|
|
goto fail;
|
|
if (r == 0)
|
|
break;
|
|
hash->write (context, readbuf, r);
|
|
}
|
|
|
|
hash->write (context, &v, sizeof (v));
|
|
hash->write (context, &v4, sizeof (v4));
|
|
while (rem)
|
|
{
|
|
r = grub_file_read (sig, readbuf,
|
|
rem < READBUF_SIZE ? rem : READBUF_SIZE);
|
|
if (r < 0)
|
|
goto fail;
|
|
if (r == 0)
|
|
break;
|
|
hash->write (context, readbuf, r);
|
|
rem -= r;
|
|
}
|
|
hash->write (context, &v, sizeof (v));
|
|
s = 0xff;
|
|
hash->write (context, &s, sizeof (s));
|
|
hash->write (context, &headlen, sizeof (headlen));
|
|
r = grub_file_read (sig, &unhashed_sub, sizeof (unhashed_sub));
|
|
if (r != sizeof (unhashed_sub))
|
|
goto fail;
|
|
{
|
|
grub_uint8_t *ptr;
|
|
grub_uint32_t l;
|
|
rem = grub_be_to_cpu16 (unhashed_sub);
|
|
if (rem > READBUF_SIZE)
|
|
goto fail;
|
|
r = grub_file_read (sig, readbuf, rem);
|
|
if (r != rem)
|
|
goto fail;
|
|
for (ptr = readbuf; ptr < readbuf + rem; ptr += l)
|
|
{
|
|
if (*ptr < 192)
|
|
l = *ptr++;
|
|
else if (*ptr < 255)
|
|
{
|
|
if (ptr + 1 >= readbuf + rem)
|
|
break;
|
|
l = (((ptr[0] & ~192) << GRUB_CHAR_BIT) | ptr[1]) + 192;
|
|
ptr += 2;
|
|
}
|
|
else
|
|
{
|
|
if (ptr + 5 >= readbuf + rem)
|
|
break;
|
|
l = grub_be_to_cpu32 (grub_get_unaligned32 (ptr + 1));
|
|
ptr += 5;
|
|
}
|
|
if (*ptr == 0x10 && l >= 8)
|
|
keyid = grub_get_unaligned64 (ptr + 1);
|
|
}
|
|
}
|
|
|
|
hash->final (context);
|
|
|
|
grub_dprintf ("crypt", "alive\n");
|
|
|
|
hval = hash->read (context);
|
|
|
|
if (grub_file_read (sig, hash_start, sizeof (hash_start)) != sizeof (hash_start))
|
|
goto fail;
|
|
if (grub_memcmp (hval, hash_start, sizeof (hash_start)) != 0)
|
|
goto fail;
|
|
|
|
grub_dprintf ("crypt", "@ %x\n", (int)grub_file_tell (sig));
|
|
|
|
for (i = 0; i < pkalgos[pk].nmpisig; i++)
|
|
{
|
|
grub_uint16_t l;
|
|
grub_size_t lb;
|
|
grub_dprintf ("crypt", "alive\n");
|
|
if (grub_file_read (sig, &l, sizeof (l)) != sizeof (l))
|
|
goto fail;
|
|
grub_dprintf ("crypt", "alive\n");
|
|
lb = (grub_be_to_cpu16 (l) + 7) / 8;
|
|
grub_dprintf ("crypt", "l = 0x%04x\n", grub_be_to_cpu16 (l));
|
|
if (lb > READBUF_SIZE - sizeof (grub_uint16_t))
|
|
goto fail;
|
|
grub_dprintf ("crypt", "alive\n");
|
|
if (grub_file_read (sig, readbuf + sizeof (grub_uint16_t), lb) != (grub_ssize_t) lb)
|
|
goto fail;
|
|
grub_dprintf ("crypt", "alive\n");
|
|
grub_memcpy (readbuf, &l, sizeof (l));
|
|
grub_dprintf ("crypt", "alive\n");
|
|
|
|
if (gcry_mpi_scan (&mpis[i], GCRYMPI_FMT_PGP,
|
|
readbuf, lb + sizeof (grub_uint16_t), 0))
|
|
goto fail;
|
|
grub_dprintf ("crypt", "alive\n");
|
|
}
|
|
|
|
if (pkey)
|
|
sk = grub_crypto_pk_locate_subkey (keyid, pkey);
|
|
else
|
|
sk = grub_crypto_pk_locate_subkey_in_trustdb (keyid);
|
|
if (!sk)
|
|
{
|
|
/* TRANSLATORS: %08x is 32-bit key id. */
|
|
grub_error (GRUB_ERR_BAD_SIGNATURE, N_("public key %08x not found"),
|
|
keyid);
|
|
goto fail;
|
|
}
|
|
|
|
if (pkalgos[pk].pad (&hmpi, hval, hash, sk))
|
|
goto fail;
|
|
if (!*pkalgos[pk].algo)
|
|
{
|
|
grub_dl_load (pkalgos[pk].module);
|
|
grub_errno = GRUB_ERR_NONE;
|
|
}
|
|
|
|
if (!*pkalgos[pk].algo)
|
|
{
|
|
grub_error (GRUB_ERR_BAD_SIGNATURE, N_("module `%s' isn't loaded"),
|
|
pkalgos[pk].module);
|
|
goto fail;
|
|
}
|
|
if ((*pkalgos[pk].algo)->verify (0, hmpi, mpis, sk->mpis, 0, 0))
|
|
goto fail;
|
|
|
|
return GRUB_ERR_NONE;
|
|
|
|
fail:
|
|
grub_free (context);
|
|
grub_free (readbuf);
|
|
if (!grub_errno)
|
|
return grub_error (GRUB_ERR_BAD_SIGNATURE, N_("bad signature"));
|
|
return grub_errno;
|
|
}
|
|
}
|
|
|
|
grub_err_t
|
|
grub_verify_signature (grub_file_t f, grub_file_t sig,
|
|
struct grub_public_key *pkey)
|
|
{
|
|
return grub_verify_signature_real (0, 0, f, sig, pkey);
|
|
}
|
|
|
|
static grub_err_t
|
|
grub_cmd_trust (grub_extcmd_context_t ctxt,
|
|
int argc, char **args)
|
|
{
|
|
grub_file_t pkf;
|
|
struct grub_public_key *pk = NULL;
|
|
|
|
if (argc < 1)
|
|
return grub_error (GRUB_ERR_BAD_ARGUMENT, N_("one argument expected"));
|
|
|
|
grub_file_filter_disable_compression ();
|
|
if (ctxt->state[OPTION_SKIP_SIG].set)
|
|
grub_file_filter_disable_pubkey ();
|
|
pkf = grub_file_open (args[0]);
|
|
if (!pkf)
|
|
return grub_errno;
|
|
pk = grub_load_public_key (pkf);
|
|
if (!pk)
|
|
{
|
|
grub_file_close (pkf);
|
|
return grub_errno;
|
|
}
|
|
grub_file_close (pkf);
|
|
|
|
pk->next = grub_pk_trusted;
|
|
grub_pk_trusted = pk;
|
|
|
|
return GRUB_ERR_NONE;
|
|
}
|
|
|
|
static grub_err_t
|
|
grub_cmd_list (grub_command_t cmd __attribute__ ((unused)),
|
|
int argc __attribute__ ((unused)),
|
|
char **args __attribute__ ((unused)))
|
|
{
|
|
struct grub_public_key *pk = NULL;
|
|
struct grub_public_subkey *sk = NULL;
|
|
|
|
for (pk = grub_pk_trusted; pk; pk = pk->next)
|
|
for (sk = pk->subkeys; sk; sk = sk->next)
|
|
{
|
|
unsigned i;
|
|
for (i = 0; i < 20; i += 2)
|
|
grub_printf ("%02x%02x ", ((grub_uint8_t *) sk->fingerprint)[i],
|
|
((grub_uint8_t *) sk->fingerprint)[i + 1]);
|
|
grub_printf ("\n");
|
|
}
|
|
|
|
return GRUB_ERR_NONE;
|
|
}
|
|
|
|
static grub_err_t
|
|
grub_cmd_distrust (grub_command_t cmd __attribute__ ((unused)),
|
|
int argc, char **args)
|
|
{
|
|
grub_uint32_t keyid, keyid_be;
|
|
struct grub_public_key **pkey;
|
|
struct grub_public_subkey *sk;
|
|
|
|
if (argc < 1)
|
|
return grub_error (GRUB_ERR_BAD_ARGUMENT, N_("one argument expected"));
|
|
keyid = grub_strtoull (args[0], 0, 16);
|
|
if (grub_errno)
|
|
return grub_errno;
|
|
keyid_be = grub_cpu_to_be32 (keyid);
|
|
|
|
for (pkey = &grub_pk_trusted; *pkey; pkey = &((*pkey)->next))
|
|
{
|
|
struct grub_public_key *next;
|
|
for (sk = (*pkey)->subkeys; sk; sk = sk->next)
|
|
if (grub_memcmp (sk->fingerprint + 4, &keyid_be, 4) == 0)
|
|
break;
|
|
if (!sk)
|
|
continue;
|
|
next = (*pkey)->next;
|
|
free_pk (*pkey);
|
|
*pkey = next;
|
|
return GRUB_ERR_NONE;
|
|
}
|
|
/* TRANSLATORS: %08x is 32-bit key id. */
|
|
return grub_error (GRUB_ERR_BAD_SIGNATURE, N_("public key %08x not found"), keyid);
|
|
}
|
|
|
|
static grub_err_t
|
|
grub_cmd_verify_signature (grub_extcmd_context_t ctxt,
|
|
int argc, char **args)
|
|
{
|
|
grub_file_t f, sig;
|
|
grub_err_t err;
|
|
struct grub_public_key *pk = NULL;
|
|
|
|
grub_dprintf ("crypt", "alive\n");
|
|
|
|
if (argc < 2)
|
|
return grub_error (GRUB_ERR_BAD_ARGUMENT, N_("two arguments expected"));
|
|
|
|
grub_dprintf ("crypt", "alive\n");
|
|
|
|
if (argc > 2)
|
|
{
|
|
grub_file_t pkf;
|
|
grub_file_filter_disable_compression ();
|
|
if (ctxt->state[OPTION_SKIP_SIG].set)
|
|
grub_file_filter_disable_pubkey ();
|
|
pkf = grub_file_open (args[2]);
|
|
if (!pkf)
|
|
return grub_errno;
|
|
pk = grub_load_public_key (pkf);
|
|
if (!pk)
|
|
{
|
|
grub_file_close (pkf);
|
|
return grub_errno;
|
|
}
|
|
grub_file_close (pkf);
|
|
}
|
|
|
|
grub_file_filter_disable_all ();
|
|
f = grub_file_open (args[0]);
|
|
if (!f)
|
|
return grub_errno;
|
|
|
|
grub_file_filter_disable_all ();
|
|
sig = grub_file_open (args[1]);
|
|
if (!sig)
|
|
{
|
|
grub_file_close (f);
|
|
return grub_errno;
|
|
}
|
|
|
|
err = grub_verify_signature (f, sig, pk);
|
|
grub_file_close (f);
|
|
grub_file_close (sig);
|
|
return err;
|
|
}
|
|
|
|
static int sec = 0;
|
|
|
|
static grub_ssize_t
|
|
verified_read (struct grub_file *file, char *buf, grub_size_t len)
|
|
{
|
|
grub_memcpy (buf, (char *) file->data + file->offset, len);
|
|
return len;
|
|
}
|
|
|
|
static grub_err_t
|
|
verified_close (struct grub_file *file)
|
|
{
|
|
grub_free (file->data);
|
|
file->data = 0;
|
|
return GRUB_ERR_NONE;
|
|
}
|
|
|
|
struct grub_fs verified_fs =
|
|
{
|
|
.name = "verified_read",
|
|
.read = verified_read,
|
|
.close = verified_close
|
|
};
|
|
|
|
static grub_file_t
|
|
grub_pubkey_open (grub_file_t io, const char *filename)
|
|
{
|
|
grub_file_t sig;
|
|
char *fsuf, *ptr;
|
|
grub_err_t err;
|
|
grub_file_filter_t curfilt[GRUB_FILE_FILTER_MAX];
|
|
grub_file_t ret;
|
|
|
|
if (!sec)
|
|
return io;
|
|
if (io->device->disk && io->device->disk->id == GRUB_DISK_DEVICE_MEMDISK_ID)
|
|
return io;
|
|
fsuf = grub_malloc (grub_strlen (filename) + sizeof (".sig"));
|
|
if (!fsuf)
|
|
return NULL;
|
|
ptr = grub_stpcpy (fsuf, filename);
|
|
grub_memcpy (ptr, ".sig", sizeof (".sig"));
|
|
|
|
grub_memcpy (curfilt, grub_file_filters_enabled,
|
|
sizeof (curfilt));
|
|
grub_file_filter_disable_all ();
|
|
sig = grub_file_open (fsuf);
|
|
grub_memcpy (grub_file_filters_enabled, curfilt,
|
|
sizeof (curfilt));
|
|
grub_free (fsuf);
|
|
if (!sig)
|
|
return NULL;
|
|
|
|
ret = grub_malloc (sizeof (*ret));
|
|
if (!ret)
|
|
return NULL;
|
|
*ret = *io;
|
|
|
|
ret->fs = &verified_fs;
|
|
ret->not_easily_seekable = 0;
|
|
if (ret->size >> (sizeof (grub_size_t) * GRUB_CHAR_BIT - 1))
|
|
{
|
|
grub_error (GRUB_ERR_NOT_IMPLEMENTED_YET,
|
|
"big file signature isn't implemented yet");
|
|
return NULL;
|
|
}
|
|
ret->data = grub_malloc (ret->size);
|
|
if (!ret->data)
|
|
{
|
|
grub_free (ret);
|
|
return NULL;
|
|
}
|
|
if (grub_file_read (io, ret->data, ret->size) != (grub_ssize_t) ret->size)
|
|
{
|
|
if (!grub_errno)
|
|
grub_error (GRUB_ERR_FILE_READ_ERROR, N_("premature end of file %s"),
|
|
filename);
|
|
return NULL;
|
|
}
|
|
|
|
err = grub_verify_signature_real (ret->data, ret->size, 0, sig, NULL);
|
|
grub_file_close (sig);
|
|
if (err)
|
|
return NULL;
|
|
io->device = 0;
|
|
grub_file_close (io);
|
|
return ret;
|
|
}
|
|
|
|
static char *
|
|
grub_env_write_sec (struct grub_env_var *var __attribute__ ((unused)),
|
|
const char *val)
|
|
{
|
|
sec = (*val == '1') || (*val == 'e');
|
|
return grub_strdup (sec ? "enforce" : "no");
|
|
}
|
|
|
|
static grub_ssize_t
|
|
pseudo_read (struct grub_file *file, char *buf, grub_size_t len)
|
|
{
|
|
grub_memcpy (buf, (grub_uint8_t *) file->data + file->offset, len);
|
|
return len;
|
|
}
|
|
|
|
|
|
/* Filesystem descriptor. */
|
|
struct grub_fs pseudo_fs =
|
|
{
|
|
.name = "pseudo",
|
|
.read = pseudo_read
|
|
};
|
|
|
|
|
|
static grub_extcmd_t cmd, cmd_trust;
|
|
static grub_command_t cmd_distrust, cmd_list;
|
|
|
|
GRUB_MOD_INIT(verify)
|
|
{
|
|
const char *val;
|
|
struct grub_module_header *header;
|
|
|
|
val = grub_env_get ("check_signatures");
|
|
if (val && (val[0] == '1' || val[0] == 'e'))
|
|
sec = 1;
|
|
else
|
|
sec = 0;
|
|
|
|
grub_file_filter_register (GRUB_FILE_FILTER_PUBKEY, grub_pubkey_open);
|
|
|
|
grub_register_variable_hook ("check_signatures", 0, grub_env_write_sec);
|
|
grub_env_export ("check_signatures");
|
|
|
|
grub_pk_trusted = 0;
|
|
FOR_MODULES (header)
|
|
{
|
|
struct grub_file pseudo_file;
|
|
struct grub_public_key *pk = NULL;
|
|
|
|
grub_memset (&pseudo_file, 0, sizeof (pseudo_file));
|
|
|
|
/* Not an ELF module, skip. */
|
|
if (header->type != OBJ_TYPE_PUBKEY)
|
|
continue;
|
|
|
|
pseudo_file.fs = &pseudo_fs;
|
|
pseudo_file.size = (header->size - sizeof (struct grub_module_header));
|
|
pseudo_file.data = (char *) header + sizeof (struct grub_module_header);
|
|
|
|
pk = grub_load_public_key (&pseudo_file);
|
|
if (!pk)
|
|
grub_fatal ("error loading initial key: %s\n", grub_errmsg);
|
|
|
|
pk->next = grub_pk_trusted;
|
|
grub_pk_trusted = pk;
|
|
}
|
|
|
|
if (!val)
|
|
grub_env_set ("check_signatures", grub_pk_trusted ? "enforce" : "no");
|
|
|
|
cmd = grub_register_extcmd ("verify_detached", grub_cmd_verify_signature, 0,
|
|
N_("[-s|--skip-sig] FILE SIGNATURE_FILE [PUBKEY_FILE]"),
|
|
N_("Verify detached signature."),
|
|
options);
|
|
cmd_trust = grub_register_extcmd ("trust", grub_cmd_trust, 0,
|
|
N_("[-s|--skip-sig] PUBKEY_FILE"),
|
|
N_("Add PKFILE to trusted keys."),
|
|
options);
|
|
cmd_list = grub_register_command ("list_trusted", grub_cmd_list,
|
|
0,
|
|
N_("List trusted keys."));
|
|
cmd_distrust = grub_register_command ("distrust", grub_cmd_distrust,
|
|
N_("PUBKEY_ID"),
|
|
N_("Remove KEYID from trusted keys."));
|
|
}
|
|
|
|
GRUB_MOD_FINI(verify)
|
|
{
|
|
grub_file_filter_unregister (GRUB_FILE_FILTER_PUBKEY);
|
|
grub_unregister_extcmd (cmd);
|
|
grub_unregister_extcmd (cmd_trust);
|
|
grub_unregister_command (cmd_list);
|
|
grub_unregister_command (cmd_distrust);
|
|
}
|