X-Git-Url: https://git.sommitrealweird.co.uk/onak.git/blobdiff_plain/62c94dacbe471278972813b59776a5fadbd8a543..HEAD:/parsekey.c diff --git a/parsekey.c b/parsekey.c index 4ec7ef3..f780520 100644 --- a/parsekey.c +++ b/parsekey.c @@ -1,12 +1,22 @@ /* * parsekey.c - Routines to parse an OpenPGP key. * - * Jonathan McDowell + * Copyright 2002-2004,2007-2008,2011 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 @@ -16,22 +26,10 @@ #include "keystructs.h" #include "ll.h" #include "mem.h" +#include "onak.h" +#include "openpgp.h" #include "parsekey.h" -/** - * add_key - Takes a key and adds it to the keyserver. - * @key: The public key to add. - * - * This function takes a public key and adds it to the keyserver. - * It first of all sees if we already have the key locally. If we do then - * we retrieve it and merge the two keys. We then store the resulting key - * (or just the original we received if we don't already have it). We then - * send out the appropriate updates to our keyserver peers. - */ -int add_key(struct openpgp_publickey *key) { - return 0; -} - /** * parse_keys - Process a stream of packets for public keys + sigs. * @packets: The packet list to parse. @@ -59,13 +57,13 @@ int parse_keys(struct openpgp_packet_list *packets, while (packets != NULL) { switch (packets->packet->tag) { - case 2: + case OPENPGP_PACKET_SIGNATURE: /* * It's a signature packet. Add it to either the public - * key (it should be a revocation), to the current UID - * or the current subkey. + * key, to the current UID or the current subkey. */ - assert(curkey != NULL); + if (curkey == NULL) + return ONAK_E_INVALID_PARAM; if (curkey->subkeys != NULL) { ADD_PACKET_TO_LIST_END(curkey->last_subkey, sig, @@ -76,11 +74,30 @@ int parse_keys(struct openpgp_packet_list *packets, packet_dup(packets->packet)); } else { ADD_PACKET_TO_LIST_END(curkey, - revocation, + sig, packet_dup(packets->packet)); + /* + * This is a signature on the public key; check + * if it's a revocation. + */ + if (packets->packet->data[0] == 3 && + packets->packet->data[2] == + OPENPGP_SIGTYPE_KEY_REV) { + /* + * Type 3 key, 0x20 == revocation + */ + curkey->revoked = true; + } else if (packets->packet->data[0] == 4 && + packets->packet->data[1] == + OPENPGP_SIGTYPE_KEY_REV) { + /* + * Type 4 key, 0x20 == revocation + */ + curkey->revoked = true; + } } break; - case 6: + case OPENPGP_PACKET_PUBLICKEY: /* * It's a public key packet, so start a new key in our * list. @@ -96,28 +113,31 @@ int parse_keys(struct openpgp_packet_list *packets, curkey->publickey = packet_dup(packets->packet); count++; break; - case 13: - case 17: + case OPENPGP_PACKET_UID: + case OPENPGP_PACKET_UAT: /* * It's a UID packet (or a photo id, which is similar). */ - assert(curkey != NULL); - assert(curkey->subkeys == NULL); + if (curkey == NULL) + return ONAK_E_INVALID_PARAM; + if (curkey->subkeys != NULL) + return ONAK_E_INVALID_PARAM; ADD_PACKET_TO_LIST_END(curkey, uid, packet_dup(packets->packet)); break; - case 14: + case OPENPGP_PACKET_PUBLICSUBKEY: /* * It's a subkey packet. */ - assert(curkey != NULL); + if (curkey == NULL) + return ONAK_E_INVALID_PARAM; ADD_PACKET_TO_LIST_END(curkey, subkey, packet_dup(packets->packet)); break; - case 12: - case 61: + case OPENPGP_PACKET_TRUST: + case OPENPGP_PACKET_COMMENT: /* * One of: * @@ -126,8 +146,8 @@ int parse_keys(struct openpgp_packet_list *packets, */ break; default: - fprintf(stderr, "Unsupported packet type: %d\n", - packets->packet->tag); + /* Unsupported packet. Do what? Ignore for now. */ + break; } packets = packets->next; } @@ -145,7 +165,7 @@ int parse_keys(struct openpgp_packet_list *packets, */ int debug_packet(struct openpgp_packet *packet) { - printf("\tNew format: %d, Tag: %d, Length: %d\n", + printf("\tNew format: %d, Tag: %u, Length: %zd\n", packet->newformat, packet->tag, packet->length); @@ -158,38 +178,50 @@ int debug_packet(struct openpgp_packet *packet) * @getchar_func: The function to get the next character from the stream. * @ctx: A pointer to the context structure for getchar_func. * @packets: The outputted list of packets. + * @maxnum: The maximum number of keys to read. 0 means unlimited. * * This function uses getchar_func to read characters from an OpenPGP * packet stream and reads the packets into a linked list of packets * ready for parsing as a public key or whatever. */ -int read_openpgp_stream(int (*getchar_func)(void *ctx, size_t count, - unsigned char *c), +onak_status_t read_openpgp_stream(int (*getchar_func)(void *ctx, size_t count, + void *c), void *ctx, - struct openpgp_packet_list **packets) + struct openpgp_packet_list **packets, + int maxnum) { unsigned char curchar = 0; - unsigned long count = 0; - struct openpgp_packet_list *curpacket = NULL; - int rc = 0; + struct openpgp_packet_list *curpacket = NULL, **packetend = NULL; + onak_status_t rc = ONAK_E_OK; + int keys = 0; bool inpacket = false; - assert(packets != NULL); + if (packets == NULL) + return ONAK_E_INVALID_PARAM; - while (!rc && !getchar_func(ctx, 1, &curchar)) { + curpacket = *packets; + if (curpacket != NULL) { + while (curpacket->next != NULL) { + curpacket = curpacket->next; + } + } + + while (!rc && (maxnum == 0 || keys < maxnum) && + !getchar_func(ctx, 1, &curchar)) { if (!inpacket && (curchar & 0x80)) { /* * New packet. Record the fact we're in a packet and * allocate memory for it. */ inpacket = true; - count = 0; if (curpacket != NULL) { curpacket->next = malloc(sizeof (*curpacket)); + packetend = &curpacket->next; curpacket = curpacket->next; } else { *packets = curpacket = malloc(sizeof (*curpacket)); + packetend = packets; } memset(curpacket, 0, sizeof(*curpacket)); curpacket->packet = @@ -199,7 +231,9 @@ int read_openpgp_stream(int (*getchar_func)(void *ctx, size_t count, curpacket->packet->newformat = (curchar & 0x40); - // TODO: Better error checking on getchar_func. + /* + * TODO: Better error checking on getchar_func. + */ if (curpacket->packet->newformat) { curpacket->packet->tag = (curchar & 0x3F); rc = getchar_func(ctx, 1, &curchar); @@ -213,7 +247,9 @@ int read_openpgp_stream(int (*getchar_func)(void *ctx, size_t count, curpacket->packet->length += 192; } else if (curpacket->packet->length > 223 && curpacket->packet->length < 255) { - printf("Partial length; not supported.\n"); + free(curpacket->packet); + curpacket->packet = NULL; + rc = ONAK_E_UNSUPPORTED_FEATURE; } else if (curpacket->packet->length == 255) { /* * 5 byte length; ie 255 followed by 3 @@ -223,13 +259,13 @@ int read_openpgp_stream(int (*getchar_func)(void *ctx, size_t count, curpacket->packet->length = curchar; curpacket->packet->length <<= 8; rc = getchar_func(ctx, 1, &curchar); - curpacket->packet->length = curchar; + curpacket->packet->length += curchar; curpacket->packet->length <<= 8; rc = getchar_func(ctx, 1, &curchar); - curpacket->packet->length = curchar; + curpacket->packet->length += curchar; curpacket->packet->length <<= 8; rc = getchar_func(ctx, 1, &curchar); - curpacket->packet->length = curchar; + curpacket->packet->length += curchar; } } else { curpacket->packet->tag = (curchar & 0x3C) >> 2; @@ -259,29 +295,41 @@ int read_openpgp_stream(int (*getchar_func)(void *ctx, size_t count, curpacket->packet->length += curchar; break; case 3: - fprintf(stderr, "Unsupported length type 3.\n"); - curpacket->packet->length = 0; - curpacket->packet->data = NULL; - rc = -1; + rc = ONAK_E_UNSUPPORTED_FEATURE; + free(curpacket->packet); + curpacket->packet = NULL; break; } } if (rc == 0) { + if (curpacket->packet->tag == + OPENPGP_PACKET_PUBLICKEY) { + keys++; + } curpacket->packet->data = malloc(curpacket->packet->length * sizeof(unsigned char)); - rc = getchar_func(ctx, - curpacket->packet->length, - curpacket->packet->data); + if (curpacket->packet->data == NULL) { + rc = ONAK_E_NOMEM; + } else { + rc = getchar_func(ctx, + curpacket->packet->length, + curpacket->packet->data); + } } inpacket = false; } else { - fprintf(stderr, "Unexpected character: 0x%X\n", - curchar); + rc = ONAK_E_INVALID_PKT; } } + /* Trim the last packet if it doesn't actually exist */ + if (packetend != NULL && (*packetend)->packet == NULL) { + free(*packetend); + *packetend = NULL; + } + return (rc); } @@ -294,8 +342,8 @@ int read_openpgp_stream(int (*getchar_func)(void *ctx, size_t count, * This function uses putchar_func to write characters to an OpenPGP * packet stream from a linked list of packets. */ -int write_openpgp_stream(int (*putchar_func)(void *ctx, size_t count, - unsigned char *c), +onak_status_t write_openpgp_stream(int (*putchar_func)(void *ctx, size_t count, + void *c), void *ctx, struct openpgp_packet_list *packets) { @@ -320,8 +368,28 @@ int write_openpgp_stream(int (*putchar_func)(void *ctx, size_t count, curchar = (packets->packet->length - 192) & 0xFF; putchar_func(ctx, 1, &curchar); + } else if (packets->packet->length > 8382 && + packets->packet->length < 0xFFFFFFFF) { + curchar = 255; + putchar_func(ctx, 1, &curchar); + + curchar = (packets->packet->length >> 24); + curchar &= 0xFF; + putchar_func(ctx, 1, &curchar); + + curchar = (packets->packet->length >> 16); + curchar &= 0xFF; + putchar_func(ctx, 1, &curchar); + + curchar = (packets->packet->length >> 8); + curchar &= 0xFF; + putchar_func(ctx, 1, &curchar); + + curchar = packets->packet->length; + curchar &= 0xFF; + putchar_func(ctx, 1, &curchar); } else { - fputs("Unsupported new format length.\n", stderr); + return ONAK_E_UNSUPPORTED_FEATURE; } } else { curchar |= (packets->packet->tag << 2); @@ -350,13 +418,12 @@ int write_openpgp_stream(int (*putchar_func)(void *ctx, size_t count, } } - putchar_func(ctx, packets->packet->length, packets->packet->data); -// for (i = 0; i < packets->packet->length; i++) { -// putchar_func(ctx, packets->packet->data[i]); -// } + putchar_func(ctx, packets->packet->length, + packets->packet->data); packets = packets->next; } - return 0; + + return ONAK_E_OK; } /** @@ -384,9 +451,9 @@ int flatten_publickey(struct openpgp_publickey *key, } /* - * Now do any revocation signatures on the main key. + * Now do any signatures on the main key. */ - for (tmplist = key->revocations; tmplist != NULL; + for (tmplist = key->sigs; tmplist != NULL; tmplist = tmplist->next) { ADD_PACKET_TO_LIST((*list_end), packet_dup(tmplist->packet));