X-Git-Url: https://git.sommitrealweird.co.uk/onak.git/blobdiff_plain/8e58a1769ce5e492dd68904dfc81b6e077fc2a3a..4c8bebffd4bc105ebaa09256b7a57f4a6201bd52:/merge.c diff --git a/merge.c b/merge.c index 96e628b..9dcbf4d 100644 --- a/merge.c +++ b/merge.c @@ -1,33 +1,86 @@ /* * merge.c - Routines to merge OpenPGP public keys. * - * Jonathan McDowell + * Copyright 2002-2005,2007,2011 Jonathan McDowell * - * Copyright 2002 Project Purple + * 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; version 2 of the License. + * + * 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, write to the Free Software Foundation, Inc., 51 + * Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ -#include #include #include +#include +#include "decodekey.h" #include "keydb.h" #include "keyid.h" #include "keystructs.h" #include "ll.h" +#include "log.h" #include "mem.h" #include "merge.h" /** * compare_packets - Check to see if 2 OpenPGP packets are the same. - * @a: The first key to compare. - * @b: The second key to compare. + * @a: The first packet to compare. + * @b: The second packet to compare. * - * Takes 2 keys and returns true if they are the same and false otherwise. + * Takes 2 packets and returns 0 if they are the same, -1 if a is + * less than b, or 1 if a is greater than b. */ -bool compare_packets(struct openpgp_packet *a, struct openpgp_packet *b) +int compare_packets(struct openpgp_packet *a, struct openpgp_packet *b) { - return (a->tag == b->tag && a->length == b->length && - !memcmp(a->data, b->data, b->length)); + int ret, len; + + if (a->tag > b->tag) { + ret = 1; + } else if (b->tag > a->tag) { + ret = -1; + } else { + len = (a->length < b->length) ? a->length : b->length; + ret = memcmp(a->data, b->data, len); + if (ret == 0 && a->length != b->length) { + ret = (a->length < b->length) ? -1 : 1; + } + } + + return ret; +} + +/** + * compare_signatures - Check to see if 2 OpenPGP signatures are the same. + * @a: The first signature to compare. + * @b: The second signature to compare. + * + * Takes 2 signature packets and returns true if they are the same and + * false otherwise. + */ +bool compare_signatures(struct openpgp_packet *a, struct openpgp_packet *b) +{ + uint64_t a_keyid, b_keyid; + time_t a_creation, b_creation; + + if (a->data[0] != b->data[0]) { + /* Different signature versions, so not the same */ + return false; + } else if (a->data[0] == 4 && a->data[1] != b->data[1]) { + /* Type 4 signature, but different types */ + return false; + } else { + sig_info(a, &a_keyid, &a_creation); + sig_info(b, &b_keyid, &b_creation); + return (a_creation == b_creation) && (a_keyid == b_keyid); + } } /** @@ -44,7 +97,7 @@ bool find_packet(struct openpgp_packet_list *packet_list, bool found = false; while (!found && packet_list != NULL) { - if (compare_packets(packet_list->packet, packet)) { + if (compare_packets(packet_list->packet, packet) == 0) { found = true; } packet_list = packet_list -> next; @@ -53,6 +106,31 @@ bool find_packet(struct openpgp_packet_list *packet_list, return found; } +/** + * find_signature - Checks to see if an OpenPGP signature exists in a list. + * @packet_list: The list of packets to look in. + * @packet: The signature to look for. + * + * Walks through the packet_list checking to see if the signature given is + * present in it. Returns a pointer to it if it is, NULL otherwise. + * + */ +struct openpgp_packet_list *find_signature( + struct openpgp_packet_list *packet_list, + struct openpgp_packet *packet) +{ + struct openpgp_packet_list *found = NULL; + + while (!found && packet_list != NULL) { + if (compare_signatures(packet_list->packet, packet)) { + found = packet_list; + } + packet_list = packet_list -> next; + } + + return found; +} + /** * get_signed_packet - Gets a signed packet from a list. * @packet_list: The list of packets to look in. @@ -68,7 +146,7 @@ struct openpgp_signedpacket_list *find_signed_packet( struct openpgp_signedpacket_list *found = NULL; while (found == NULL && packet_list != NULL) { - if (compare_packets(packet_list->packet, packet)) { + if (compare_packets(packet_list->packet, packet) == 0) { found = packet_list; } packet_list = packet_list -> next; @@ -95,7 +173,7 @@ bool remove_signed_packet(struct openpgp_signedpacket_list **packet_list, bool found = false; for (cur = *packet_list; !found && (cur != NULL); cur = cur->next) { - if (compare_packets(cur->packet, packet)) { + if (compare_packets(cur->packet, packet) == 0) { found = true; if (prev == NULL) { *packet_list = cur->next; @@ -105,7 +183,11 @@ bool remove_signed_packet(struct openpgp_signedpacket_list **packet_list, if (cur->next == NULL) { *list_end = prev; } + /* + * TODO: Free the removed signed packet... + */ } + prev = cur; } return found; @@ -128,12 +210,18 @@ int merge_packet_sigs(struct openpgp_signedpacket_list *old, struct openpgp_packet_list *curpacket = NULL; struct openpgp_packet_list *nextpacket = NULL; - assert(compare_packets(old->packet, new->packet)); + log_assert(compare_packets(old->packet, new->packet) == 0); curpacket = new->sigs; while (curpacket != NULL) { nextpacket = curpacket->next; - if (find_packet(old->sigs, curpacket->packet)) { + /* + * TODO: We should be checking the signature and then + * potentially merging/replacing it depending on the subpackets + * really. For now this stops us adding the same one twice + * however. + */ + if (find_signature(old->sigs, curpacket->packet)) { /* * We already have this sig, remove it from the * difference list and free the memory allocated for @@ -142,7 +230,7 @@ int merge_packet_sigs(struct openpgp_signedpacket_list *old, if (lastpacket != NULL) { lastpacket->next = curpacket->next; } else { - assert(curpacket == new->sigs); + log_assert(curpacket == new->sigs); new->sigs = curpacket->next; } curpacket->next = NULL; @@ -192,25 +280,29 @@ int merge_signed_packets(struct openpgp_signedpacket_list **old, if (newelem->sigs == NULL) { remove_signed_packet(new, new_end, - curelem->packet); + newelem->packet); } } } /* - * If *new != NULL now then there are UIDs on the new key that weren't - * on the old key. Add them. + * If *new != NULL now then there might be UIDs on the new key that + * weren't on the old key. Walk through them, checking if the UID is + * on the old key and if not adding them to it. */ for (curelem = *new; curelem != NULL; curelem = curelem->next) { - ADD_PACKET_TO_LIST((*old_end), + + if (find_signed_packet(*old, curelem->packet) == NULL) { + ADD_PACKET_TO_LIST((*old_end), packet_dup(curelem->packet)); - if (*old == NULL) { - *old = *old_end; - } - packet_list_add(&(*old_end)->sigs, + if (*old == NULL) { + *old = *old_end; + } + packet_list_add(&(*old_end)->sigs, &(*old_end)->last_sig, curelem->sigs); + } } return 0; @@ -250,12 +342,12 @@ int merge_keys(struct openpgp_publickey *a, struct openpgp_publickey *b) /* * Key IDs are the same, so I guess we have to merge them. */ - curpacket = b->revocations; + curpacket = b->sigs; while (curpacket != NULL) { nextpacket = curpacket->next; - if (find_packet(a->revocations, curpacket->packet)) { + if (find_packet(a->sigs, curpacket->packet)) { /* - * We already have this revocation, remove it + * We already have this signature, remove it * from the difference list and free the memory * allocated for it. */ @@ -263,8 +355,8 @@ int merge_keys(struct openpgp_publickey *a, struct openpgp_publickey *b) if (lastpacket != NULL) { lastpacket->next = curpacket->next; } else { - assert(curpacket == b->revocations); - b->revocations = curpacket->next; + log_assert(curpacket == b->sigs); + b->sigs = curpacket->next; } curpacket->next = NULL; free_packet_list(curpacket); @@ -274,15 +366,15 @@ int merge_keys(struct openpgp_publickey *a, struct openpgp_publickey *b) } curpacket = nextpacket; } - b->last_revocation = lastpacket; + b->last_sig = lastpacket; /* - * Anything left on b->revocations doesn't exist on - * a->revocations, so add them to the list. + * Anything left on b->sigs doesn't exist on + * a->sigs, so add them to the list. */ - packet_list_add(&a->revocations, - &a->last_revocation, - b->revocations); + packet_list_add(&a->sigs, + &a->last_sig, + b->sigs); /* * Merge uids (signed list). @@ -290,62 +382,18 @@ int merge_keys(struct openpgp_publickey *a, struct openpgp_publickey *b) */ merge_signed_packets(&a->uids, &a->last_uid, &b->uids, &b->last_uid); - merge_signed_packets(&a->subkeys, &a->last_uid, + merge_signed_packets(&a->subkeys, &a->last_subkey, &b->subkeys, &b->last_subkey); } - return rc; -} - -/** - * update_keys - Takes a list of public keys and updates them in the DB. - * @keys: The keys to update in the DB. - * - * Takes a list of keys and adds them to the database, merging them with - * the key in the database if it's already present there. The key list is - * update to contain the minimum set of updates required to get from what - * we had before to what we have now (ie the set of data that was added to - * the DB). Returns the number of entirely new keys added. - */ -int update_keys(struct openpgp_publickey **keys) -{ - struct openpgp_publickey *curkey = NULL; - struct openpgp_publickey *oldkey = NULL; - struct openpgp_publickey *prev = NULL; - int newkeys = 0; - - for (curkey = *keys; curkey != NULL; curkey = curkey->next) { - fetch_key(get_keyid(curkey), &oldkey); - - /* - * If we already have the key stored in the DB then merge it - * with the new one that's been supplied. Otherwise the key - * we've just got is the one that goes in the DB and also the - * one that we send out. - */ - if (oldkey != NULL) { - merge_keys(oldkey, curkey); - if (curkey->revocations == NULL && - curkey->uids == NULL && - curkey->subkeys == NULL) { - if (prev == NULL) { - *keys = curkey->next; - } else { - prev->next = curkey->next; - prev = curkey->next; - } - } else { - prev = curkey; - store_key(oldkey); - } - free_publickey(oldkey); - oldkey = NULL; - } else { - store_key(curkey); - newkeys++; - } + /* + * If either key was revoked, make sure both the new ones are marked as + * being so. + */ + if (a->revoked || b->revoked) { + a->revoked = b->revoked = true; } - return newkeys; + return rc; }