/* export.c * Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, * 2005 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, * USA. */ #include #include #include #include #include #include #include "options.h" #include "packet.h" #include "errors.h" #include "keydb.h" #include "memory.h" #include "util.h" #include "main.h" #include "i18n.h" #include "trustdb.h" /* An object to keep track of subkeys. */ struct subkey_list_s { struct subkey_list_s *next; u32 kid[2]; }; typedef struct subkey_list_s *subkey_list_t; static int do_export( STRLIST users, int secret, unsigned int options ); static int do_export_stream( IOBUF out, STRLIST users, int secret, KBNODE *keyblock_out, unsigned int options, int *any ); int parse_export_options(char *str,unsigned int *options,int noisy) { struct parse_options export_opts[]= { {"export-local-sigs",EXPORT_LOCAL_SIGS,NULL, N_("export signatures that are marked as local-only")}, {"export-attributes",EXPORT_ATTRIBUTES,NULL, N_("export attribute user IDs (generally photo IDs)")}, {"export-sensitive-revkeys",EXPORT_SENSITIVE_REVKEYS,NULL, N_("export revocation keys that are marked as \"sensitive\"")}, {"export-clean",EXPORT_CLEAN_SIGS|EXPORT_CLEAN_UIDS,NULL, N_("all export-clean-* options from above")}, {"export-clean-sigs",EXPORT_CLEAN_SIGS,NULL, N_("remove unusable signatures during export")}, {"export-clean-uids",EXPORT_CLEAN_UIDS,NULL, N_("remove unusable user IDs during export")}, {"export-minimal", EXPORT_MINIMAL|EXPORT_CLEAN_SIGS|EXPORT_CLEAN_UIDS,NULL, N_("export the smallest key possible")}, {"export-reset-subkey-passwd",EXPORT_RESET_SUBKEY_PASSWD,NULL, N_("remove the passphrase from exported subkeys")}, /* Aliases for backward compatibility */ {"include-local-sigs",EXPORT_LOCAL_SIGS,NULL,NULL}, {"include-attributes",EXPORT_ATTRIBUTES,NULL,NULL}, {"include-sensitive-revkeys",EXPORT_SENSITIVE_REVKEYS,NULL,NULL}, /* dummy */ {"export-unusable-sigs",0,NULL,NULL}, {NULL,0,NULL,NULL} /* add tags for include revoked and disabled? */ }; return parse_options(str,options,export_opts,noisy); } /**************** * Export the public keys (to standard out or --output). * Depending on opt.armor the output is armored. * options are defined in main.h. * If USERS is NULL, the complete ring will be exported. */ int export_pubkeys( STRLIST users, unsigned int options ) { return do_export( users, 0, options ); } /**************** * Export to an already opened stream; return -1 if no keys have * been exported */ int export_pubkeys_stream( IOBUF out, STRLIST users, KBNODE *keyblock_out, unsigned int options ) { int any, rc; rc = do_export_stream( out, users, 0, keyblock_out, options, &any ); if( !rc && !any ) rc = -1; return rc; } int export_seckeys( STRLIST users ) { return do_export( users, 1, 0 ); } int export_secsubkeys( STRLIST users ) { return do_export( users, 2, 0 ); } static int do_export( STRLIST users, int secret, unsigned int options ) { IOBUF out = NULL; int any, rc; armor_filter_context_t afx; compress_filter_context_t zfx; memset( &afx, 0, sizeof afx); memset( &zfx, 0, sizeof zfx); rc = open_outfile( NULL, 0, &out ); if( rc ) return rc; if( opt.armor ) { afx.what = secret?5:1; iobuf_push_filter( out, armor_filter, &afx ); } if( opt.compress_keys ) push_compress_filter(out,&zfx,default_compress_algo()); rc = do_export_stream( out, users, secret, NULL, options, &any ); if( rc || !any ) iobuf_cancel(out); else iobuf_close(out); return rc; } /* Release an entire subkey list. */ static void release_subkey_list (subkey_list_t list) { while (list) { subkey_list_t tmp = list->next;; xfree (list); list = tmp; } } /* Returns true if NODE is a subkey and contained in LIST. */ static int subkey_in_list_p (subkey_list_t list, KBNODE node) { if (node->pkt->pkttype == PKT_PUBLIC_SUBKEY || node->pkt->pkttype == PKT_SECRET_SUBKEY ) { u32 kid[2]; if (node->pkt->pkttype == PKT_PUBLIC_SUBKEY) keyid_from_pk (node->pkt->pkt.public_key, kid); else keyid_from_sk (node->pkt->pkt.secret_key, kid); for (; list; list = list->next) if (list->kid[0] == kid[0] && list->kid[1] == kid[1]) return 1; } return 0; } /* Allocate a new subkey list item from NODE. */ static subkey_list_t new_subkey_list_item (KBNODE node) { subkey_list_t list = xcalloc (1, sizeof *list); if (node->pkt->pkttype == PKT_PUBLIC_SUBKEY) keyid_from_pk (node->pkt->pkt.public_key, list->kid); else if (node->pkt->pkttype == PKT_SECRET_SUBKEY) keyid_from_sk (node->pkt->pkt.secret_key, list->kid); return list; } /* Helper function to check whether the subkey at NODE actually matches the description at DESC. The function returns true if the key under question has been specified by an exact specification (keyID or fingerprint) and does match the one at NODE. It is assumed that the packet at NODE is either a public or secret subkey. */ static int exact_subkey_match_p (KEYDB_SEARCH_DESC *desc, KBNODE node) { u32 kid[2]; byte fpr[MAX_FINGERPRINT_LEN]; size_t fprlen; int result = 0; switch(desc->mode) { case KEYDB_SEARCH_MODE_SHORT_KID: case KEYDB_SEARCH_MODE_LONG_KID: if (node->pkt->pkttype == PKT_PUBLIC_SUBKEY) keyid_from_pk (node->pkt->pkt.public_key, kid); else keyid_from_sk (node->pkt->pkt.secret_key, kid); break; case KEYDB_SEARCH_MODE_FPR16: case KEYDB_SEARCH_MODE_FPR20: case KEYDB_SEARCH_MODE_FPR: if (node->pkt->pkttype == PKT_PUBLIC_SUBKEY) fingerprint_from_pk (node->pkt->pkt.public_key, fpr,&fprlen); else fingerprint_from_sk (node->pkt->pkt.secret_key, fpr,&fprlen); break; default: break; } switch(desc->mode) { case KEYDB_SEARCH_MODE_SHORT_KID: if (desc->u.kid[1] == kid[1]) result = 1; break; case KEYDB_SEARCH_MODE_LONG_KID: if (desc->u.kid[0] == kid[0] && desc->u.kid[1] == kid[1]) result = 1; break; case KEYDB_SEARCH_MODE_FPR16: if (!memcmp (desc->u.fpr, fpr, 16)) result = 1; break; case KEYDB_SEARCH_MODE_FPR20: case KEYDB_SEARCH_MODE_FPR: if (!memcmp (desc->u.fpr, fpr, 20)) result = 1; break; default: break; } return result; } /* If keyblock_out is non-NULL, AND the exit code is zero, then it contains a pointer to the first keyblock found and exported. No other keyblocks are exported. The caller must free it. */ static int do_export_stream( IOBUF out, STRLIST users, int secret, KBNODE *keyblock_out, unsigned int options, int *any ) { int rc = 0; PACKET pkt; KBNODE keyblock = NULL; KBNODE kbctx, node; size_t ndesc, descindex; KEYDB_SEARCH_DESC *desc = NULL; subkey_list_t subkey_list = NULL; /* Track alreay processed subkeys. */ KEYDB_HANDLE kdbhd; STRLIST sl; *any = 0; init_packet( &pkt ); kdbhd = keydb_new (secret); if (!users) { ndesc = 1; desc = xcalloc ( ndesc, sizeof *desc ); desc[0].mode = KEYDB_SEARCH_MODE_FIRST; } else { for (ndesc=0, sl=users; sl; sl = sl->next, ndesc++) ; desc = xmalloc ( ndesc * sizeof *desc); for (ndesc=0, sl=users; sl; sl = sl->next) { if (classify_user_id (sl->d, desc+ndesc)) ndesc++; else log_error (_("key \"%s\" not found: %s\n"), sl->d, g10_errstr (G10ERR_INV_USER_ID)); } /* It would be nice to see which of the given users did actually match one in the keyring. To implement this we need to have a found flag for each entry in desc and to set this we must check all those entries after a match to mark all matched one - currently we stop at the first match. To do this we need an extra flag to enable this feature so */ } #ifdef ENABLE_SELINUX_HACKS if (secret) { log_error (_("exporting secret keys not allowed\n")); rc = G10ERR_GENERAL; goto leave; } #endif while (!(rc = keydb_search2 (kdbhd, desc, ndesc, &descindex))) { int sha1_warned=0,skip_until_subkey=0; u32 sk_keyid[2]; if (!users) desc[0].mode = KEYDB_SEARCH_MODE_NEXT; /* Read the keyblock. */ rc = keydb_get_keyblock (kdbhd, &keyblock ); if( rc ) { log_error (_("error reading keyblock: %s\n"), g10_errstr(rc) ); goto leave; } if((node=find_kbnode(keyblock,PKT_SECRET_KEY))) { PKT_secret_key *sk=node->pkt->pkt.secret_key; keyid_from_sk(sk,sk_keyid); /* We can't apply GNU mode 1001 on an unprotected key. */ if( secret == 2 && !sk->is_protected ) { log_info(_("key %s: not protected - skipped\n"), keystr(sk_keyid)); continue; } /* No v3 keys with GNU mode 1001. */ if( secret == 2 && sk->version == 3 ) { log_info(_("key %s: PGP 2.x style key - skipped\n"), keystr(sk_keyid)); continue; } /* It does not make sense to export a key with a primary key on card using a non-key stub. We simply skip those keys when used with --export-secret-subkeys. */ if (secret == 2 && sk->is_protected && sk->protect.s2k.mode == 1002 ) { log_info(_("key %s: key material on-card - skipped\n"), keystr(sk_keyid)); continue; } } else { /* It's a public key export. */ if(options&EXPORT_CLEAN_UIDS) clean_uids_from_key(keyblock,opt.verbose); } /* And write it. */ for( kbctx=NULL; (node = walk_kbnode( keyblock, &kbctx, 0 )); ) { if( skip_until_subkey ) { if(node->pkt->pkttype==PKT_PUBLIC_SUBKEY || node->pkt->pkttype==PKT_SECRET_SUBKEY) skip_until_subkey=0; else continue; } /* We used to use comment packets, but not any longer. In case we still have comments on a key, strip them here before we call build_packet(). */ if( node->pkt->pkttype == PKT_COMMENT ) continue; /* Make sure that ring_trust packets never get exported. */ if (node->pkt->pkttype == PKT_RING_TRUST) continue; /* If exact is set, then we only export what was requested (plus the primary key, if the user didn't specifically request it). */ if(desc[descindex].exact && (node->pkt->pkttype==PKT_PUBLIC_SUBKEY || node->pkt->pkttype==PKT_SECRET_SUBKEY)) { if (!exact_subkey_match_p (desc+descindex, node)) { /* Before skipping this subkey, check whether any other description wants an exact match on a subkey and include that subkey into the output too. Need to add this subkey to a list so that it won't get processed a second time. So the first step here is to check that list and skip in any case if the key is in that list. We need this whole mess because the import function is not able to merge secret keys and thus it is useless to output them as two separate keys and have import merge them. */ if (subkey_in_list_p (subkey_list, node)) skip_until_subkey = 1; /* Already processed this one. */ else { size_t j; for (j=0; j < ndesc; j++) if (j != descindex && desc[j].exact && exact_subkey_match_p (desc+j, node)) break; if (!(j < ndesc)) skip_until_subkey = 1; /* No other one matching. */ } } if(skip_until_subkey) continue; /* Mark this one as processed. */ { subkey_list_t tmp = new_subkey_list_item (node); tmp->next = subkey_list; subkey_list = tmp; } } if(node->pkt->pkttype==PKT_USER_ID) { /* Run clean_sigs_from_uid against each uid if export-clean-sigs is on. export-minimal causes it to remove all non-selfsigs as well. Note that export-minimal only applies to UID sigs (0x10, 0x11, 0x12, and 0x13). A designated revocation is not stripped. */ if(options&EXPORT_CLEAN_SIGS) clean_sigs_from_uid(keyblock,node, opt.verbose,options&EXPORT_MINIMAL); } else if(node->pkt->pkttype==PKT_SIGNATURE) { /* do not export packets which are marked as not exportable */ if(!(options&EXPORT_LOCAL_SIGS) && !node->pkt->pkt.signature->flags.exportable) continue; /* not exportable */ /* Do not export packets with a "sensitive" revocation key unless the user wants us to. Note that we do export these when issuing the actual revocation (see revoke.c). */ if(!(options&EXPORT_SENSITIVE_REVKEYS) && node->pkt->pkt.signature->revkey) { int i; for(i=0;ipkt->pkt.signature->numrevkeys;i++) if(node->pkt->pkt.signature->revkey[i]->class & 0x40) break; if(ipkt->pkt.signature->numrevkeys) continue; } } /* Don't export attribs? */ if( !(options&EXPORT_ATTRIBUTES) && node->pkt->pkttype == PKT_USER_ID && node->pkt->pkt.user_id->attrib_data ) { /* Skip until we get to something that is not an attrib or a signature on an attrib */ while(kbctx->next && kbctx->next->pkt->pkttype==PKT_SIGNATURE) { kbctx=kbctx->next; } continue; } if( secret == 2 && node->pkt->pkttype == PKT_SECRET_KEY ) { /* We don't want to export the secret parts of the * primary key, this is done by using GNU protection mode 1001 */ int save_mode = node->pkt->pkt.secret_key->protect.s2k.mode; node->pkt->pkt.secret_key->protect.s2k.mode = 1001; rc = build_packet( out, node->pkt ); node->pkt->pkt.secret_key->protect.s2k.mode = save_mode; } else if (secret == 2 && node->pkt->pkttype == PKT_SECRET_SUBKEY && (opt.export_options&EXPORT_RESET_SUBKEY_PASSWD)) { /* If the subkey is protected reset the passphrase to export an unprotected subkey. This feature is useful in cases of a subkey copied to an unattended machine where a passphrase is not required. */ PKT_secret_key *sk_save, *sk; sk_save = node->pkt->pkt.secret_key; sk = copy_secret_key (NULL, sk_save); node->pkt->pkt.secret_key = sk; log_info (_("about to export an unprotected subkey\n")); switch (is_secret_key_protected (sk)) { case -1: rc = G10ERR_PUBKEY_ALGO; break; case 0: break; default: if (sk->protect.s2k.mode == 1001) ; /* No secret parts. */ else if( sk->protect.s2k.mode == 1002 ) ; /* Card key stub. */ else { rc = check_secret_key( sk, 0 ); } break; } if (rc) { node->pkt->pkt.secret_key = sk_save; free_secret_key (sk); log_error (_("failed to unprotect the subkey: %s\n"), g10_errstr (rc)); goto leave; } rc = build_packet (out, node->pkt); node->pkt->pkt.secret_key = sk_save; free_secret_key (sk); } else { /* Warn the user if the secret key or any of the secret subkeys are protected with SHA1 and we have simple_sk_checksum set. */ if(!sha1_warned && opt.simple_sk_checksum && (node->pkt->pkttype==PKT_SECRET_KEY || node->pkt->pkttype==PKT_SECRET_SUBKEY) && node->pkt->pkt.secret_key->protect.sha1chk) { /* I hope this warning doesn't confuse people. */ log_info(_("WARNING: secret key %s does not have a " "simple SK checksum\n"),keystr(sk_keyid)); sha1_warned=1; } rc = build_packet( out, node->pkt ); } if( rc ) { log_error("build_packet(%d) failed: %s\n", node->pkt->pkttype, g10_errstr(rc) ); rc = G10ERR_WRITE_FILE; goto leave; } } ++*any; if(keyblock_out) { *keyblock_out=keyblock; break; } } if( rc == -1 ) rc = 0; leave: release_subkey_list (subkey_list); xfree(desc); keydb_release (kdbhd); if(rc || keyblock_out==NULL) release_kbnode( keyblock ); if( !*any ) log_info(_("WARNING: nothing exported\n")); return rc; }