/* import.c - Import certificates * Copyright (C) 2001 Free Software Foundation, Inc. * * This file is part of GnuPG. * * GnuPG 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 2 of the License, or * (at your option) any later version. * * GnuPG 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, write to the Free Software * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA */ #include #include #include #include #include #include #include #include #include #include #include "gpgsm.h" struct reader_cb_parm_s { FILE *fp; }; static int reader_cb (void *cb_value, char *buffer, size_t count, size_t *nread) { struct reader_cb_parm_s *parm = cb_value; size_t n; int c = 0; *nread = 0; if (!buffer) return -1; /* not supported */ for (n=0; n < count; n++) { c = getc (parm->fp); if (c == EOF) { if ( ferror (parm->fp) ) return -1; if (n) break; /* return what we have before an EOF */ return -1; } *(byte *)buffer++ = c; } *nread = n; return 0; } static void print_integer (unsigned char *p) { unsigned long len; if (!p) fputs ("none", stdout); else { len = (p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3]; for (p+=4; len; len--, p++) printf ("%02X", *p); } } static void print_time (time_t t) { if (!t) fputs ("none", stdout); else if ( t == (time_t)(-1) ) fputs ("error", stdout); else { struct tm *tp; tp = gmtime (&t); printf ("%04d-%02d-%02d %02d:%02d:%02d", 1900+tp->tm_year, tp->tm_mon+1, tp->tm_mday, tp->tm_hour, tp->tm_min, tp->tm_sec); assert (!tp->tm_isdst); } } static void print_dn (char *p) { if (!p) fputs ("error", stdout); else printf ("`%s'", p); } static void print_cert (KsbaCert cert) { unsigned char *p; char *dn; time_t t; p = ksba_cert_get_serial (cert); fputs ("serial: ", stdout); print_integer (p); ksba_free (p); putchar ('\n'); t = ksba_cert_get_validity (cert, 0); fputs ("notBefore: ", stdout); print_time (t); putchar ('\n'); t = ksba_cert_get_validity (cert, 1); fputs ("notAfter: ", stdout); print_time (t); putchar ('\n'); dn = ksba_cert_get_issuer (cert); fputs ("issuer: ", stdout); print_dn (dn); ksba_free (dn); putchar ('\n'); dn = ksba_cert_get_subject (cert); fputs ("subject: ", stdout); print_dn (dn); ksba_free (dn); putchar ('\n'); printf ("hash algo: %d\n", ksba_cert_get_digest_algo (cert)); } static MPI do_encode_md (GCRY_MD_HD md, int algo, size_t len, unsigned nbits, const byte *asn, size_t asnlen) { int nframe = (nbits+7) / 8; byte *frame; int i,n; MPI a; if( len + asnlen + 4 > nframe ) log_bug("can't encode a %d bit MD into a %d bits frame\n", (int)(len*8), (int)nbits); /* We encode the MD in this way: * * 0 A PAD(n bytes) 0 ASN(asnlen bytes) MD(len bytes) * * PAD consists of FF bytes. */ frame = xmalloc (nframe); n = 0; frame[n++] = 0; frame[n++] = 1; /* block type */ i = nframe - len - asnlen -3 ; assert( i > 1 ); memset( frame+n, 0xff, i ); n += i; frame[n++] = 0; memcpy( frame+n, asn, asnlen ); n += asnlen; memcpy( frame+n, gcry_md_read(md, algo), len ); n += len; assert( n == nframe ); gcry_mpi_scan ( &a, GCRYMPI_FMT_USG, frame, &nframe); xfree(frame); return a; } static void check_selfsigned_cert (KsbaCert cert) { /* OID for MD5 as defined in PKCS#1 (rfc2313) */ static byte asn[18] = /* Object ID is 1.2.840.113549.2.5 (md5) */ { 0x30, 0x20, 0x30, 0x0c, 0x06, 0x08, 0x2a, 0x86, 0x48, 0x86, 0xf7, 0x0d, 0x02, 0x05, 0x05, 0x00, 0x04, 0x10 }; GCRY_MD_HD md; int rc, algo; GCRY_MPI frame; char *p; GCRY_SEXP s_sig, s_hash, s_pkey; algo = ksba_cert_get_digest_algo (cert); md = gcry_md_open (algo, 0); if (!md) { log_error ("md_open failed: %s\n", gcry_strerror (-1)); return; } gcry_md_start_debug (md, "cert"); rc = ksba_cert_hash (cert, gcry_md_write, md); if (rc) { log_error ("ksba_cert_hash failed: %s\n", ksba_strerror (rc)); gcry_md_close (md); return; } gcry_md_final (md); p = ksba_cert_get_sig_val (cert); printf ("signature: %s\n", p); rc = gcry_sexp_sscan ( &s_sig, NULL, p, strlen(p)); if (rc) { log_error ("gcry_sexp_scan failed: %s\n", gcry_strerror (rc)); return; } /*gcry_sexp_dump (s_sig);*/ /* FIXME: need to map the algo to the ASN OID - we assume a fixed one for now */ frame = do_encode_md (md, algo, 16, 2048, asn, DIM(asn)); /* put hash into the S-Exp s_hash */ if ( gcry_sexp_build (&s_hash, NULL, "%m", frame) ) BUG (); /*fputs ("hash:\n", stderr); gcry_sexp_dump (s_hash);*/ _gcry_log_mpidump ("hash", frame); p = ksba_cert_get_public_key (cert); printf ("public key: %s\n", p); rc = gcry_sexp_sscan ( &s_pkey, NULL, p, strlen(p)); if (rc) { log_error ("gcry_sexp_scan failed: %s\n", gcry_strerror (rc)); return; } /*gcry_sexp_dump (s_pkey);*/ rc = gcry_pk_verify (s_sig, s_hash, s_pkey); log_error ("gcry_pk_verify: %s\n", gcry_strerror (rc)); } int gpgsm_import (int in_fd) { int rc; KsbaReader reader = NULL; KsbaCert cert = NULL; struct reader_cb_parm_s rparm; memset (&rparm, 0, sizeof rparm); rparm.fp = fdopen ( dup (in_fd), "rb"); if (!rparm.fp) { log_error ("fdopen() failed: %s\n", strerror (errno)); rc = seterr (IO_Error); goto leave; } /* setup a skaba reader which uses a callback function so that we can strip off a base64 encoding when necessary */ reader = ksba_reader_new (); if (!reader) { rc = seterr (Out_Of_Core); goto leave; } rc = ksba_reader_set_cb (reader, reader_cb, &rparm ); if (rc) { ksba_reader_release (reader); rc = map_ksba_err (rc); goto leave; } cert = ksba_cert_new (); if (!cert) { rc = seterr (Out_Of_Core); goto leave; } rc = ksba_cert_read_der (cert, reader); if (rc) { rc = map_ksba_err (rc); goto leave; } print_cert (cert); check_selfsigned_cert (cert); leave: ksba_cert_release (cert); ksba_reader_release (reader); if (rparm.fp) fclose (rparm.fp); return rc; }