1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen#include "lib.h"

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen#include "str.h"

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen#include "dict.h"

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen#include "array.h"

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen#include "var-expand.h"

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen#include "mail-storage.h"

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen#include "mailbox-attribute.h"

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen#include "mail-crypt-common.h"

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen#include "mail-crypt-key.h"

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen#include "mail-crypt-plugin.h"

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen#include "mail-user.h"

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen#include "hex-binary.h"

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen#include "safe-memset.h"

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen#include "base64.h"

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen#include "sha2.h"

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainenstruct mail_crypt_key_cache_entry {

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen struct mail_crypt_key_cache_entry *next;

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen char *pubid;

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen /* this is lazily initialized */

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen struct dcrypt_keypair pair;

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen};

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainenint mail_crypt_get_key_cache(struct mail_crypt_key_cache_entry *cache,

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen const char *pubid,

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen struct dcrypt_private_key **privkey_r,

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen struct dcrypt_public_key **pubkey_r)

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen{

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen for(struct mail_crypt_key_cache_entry *ent = cache;

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen ent != NULL; ent = ent->next)

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen {

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen if (strcmp(pubid, ent->pubid) == 0) {

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen if (privkey_r != NULL && ent->pair.priv != NULL) {

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen dcrypt_key_ref_private(ent->pair.priv);

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen *privkey_r = ent->pair.priv;

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen return 1;

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen } else if (pubkey_r != NULL && ent->pair.pub != NULL) {

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen dcrypt_key_ref_public(ent->pair.pub);

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen *pubkey_r = ent->pair.pub;

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen return 1;

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen } else if ((privkey_r == NULL && pubkey_r == NULL) ||

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen (ent->pair.priv == NULL &&

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen ent->pair.pub == NULL)) {

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen i_unreached();

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen }

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen }

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen }

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen return 0;

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen}

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainenvoid mail_crypt_put_key_cache(struct mail_crypt_key_cache_entry **cache,

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen const char *pubid,

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen struct dcrypt_private_key *privkey,

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen struct dcrypt_public_key *pubkey)

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen{

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen for(struct mail_crypt_key_cache_entry *ent = *cache;

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen ent != NULL; ent = ent->next)

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen {

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen if (strcmp(pubid, ent->pubid) == 0) {

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen if (privkey != NULL) {

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen if (ent->pair.priv == NULL) {

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen ent->pair.priv = privkey;

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen dcrypt_key_ref_private(ent->pair.priv);

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen }

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen } else if (pubkey != NULL) {

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen if (ent->pair.pub == NULL) {

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen ent->pair.pub = pubkey;

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen dcrypt_key_ref_public(ent->pair.pub);

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen }

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen } else

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen i_unreached();

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen return;

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen }

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen }

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen /* not found */

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen struct mail_crypt_key_cache_entry *ent =

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen i_new(struct mail_crypt_key_cache_entry, 1);

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen ent->pubid = i_strdup(pubid);

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen ent->pair.priv = privkey;

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen ent->pair.pub = pubkey;

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen if (ent->pair.priv != NULL)

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen dcrypt_key_ref_private(ent->pair.priv);

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen if (ent->pair.pub != NULL)

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen dcrypt_key_ref_public(ent->pair.pub);

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen if (*cache == NULL) {

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen *cache = ent;

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen } else {

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen ent->next = *cache;

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen *cache = ent;

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen }

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen}

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainenvoid mail_crypt_key_cache_destroy(struct mail_crypt_key_cache_entry **cache)

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen{

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen struct mail_crypt_key_cache_entry *next, *cur = *cache;

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen *cache = NULL;

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen while(cur != NULL) {

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen next = cur->next;

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen i_free(cur->pubid);

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen if (cur->pair.priv != NULL)

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen dcrypt_key_unref_private(&cur->pair.priv);

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen if (cur->pair.pub != NULL)

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen dcrypt_key_unref_public(&cur->pair.pub);

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen i_free(cur);

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen cur = next;

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen }

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen}

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainenint mail_crypt_private_key_id_match(struct dcrypt_private_key *key,

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen const char *pubid, const char **error_r)

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen{

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen i_assert(key != NULL);

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen buffer_t *key_id = t_str_new(MAIL_CRYPT_HASH_BUF_SIZE);

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen if (!dcrypt_key_id_private(key, MAIL_CRYPT_KEY_ID_ALGORITHM, key_id,

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen error_r))

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen return -1;

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen const char *hash = binary_to_hex(key_id->data, key_id->used);

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen if (strcmp(pubid, hash) == 0) return 1;

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen buffer_set_used_size(key_id, 0);

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen if (!dcrypt_key_id_private_old(key, key_id, error_r)) {

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen return -1;

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen }

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen hash = binary_to_hex(key_id->data, key_id->used);

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen if (strcmp(pubid, hash) != 0) {

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen *error_r = t_strdup_printf("Key %s does not match given ID %s",

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen hash, pubid);

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen return 0;

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen }

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen return 1;

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen}

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainenint mail_crypt_public_key_id_match(struct dcrypt_public_key *key,

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen const char *pubid, const char **error_r)

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen{

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen i_assert(key != NULL);

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen buffer_t *key_id = t_str_new(MAIL_CRYPT_HASH_BUF_SIZE);

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen if (!dcrypt_key_id_public(key, MAIL_CRYPT_KEY_ID_ALGORITHM, key_id,

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen error_r))

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen return -1;

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen const char *hash = binary_to_hex(key_id->data, key_id->used);

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen if (strcmp(pubid, hash) == 0) return 1;

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen buffer_set_used_size(key_id, 0);

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen if (!dcrypt_key_id_public_old(key, key_id, error_r)) {

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen return -1;

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen }

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen hash = binary_to_hex(key_id->data, key_id->used);

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen if (strcmp(pubid, hash) != 0) {

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen *error_r = t_strdup_printf("Key %s does not match given ID %s",

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen hash, pubid);

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen return 0;

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen }

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen return 1;

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen}

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainenint mail_crypt_env_get_private_key(struct mail_user *user, const char *pubid,

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen struct dcrypt_private_key **key_r,

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen const char **error_r)

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen{

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen struct mail_crypt_global_keys global_keys;

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen int ret = 0;

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen if (mail_crypt_global_keys_load(user, "mail_crypt", &global_keys,

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen TRUE, error_r) < 0) {

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen mail_crypt_global_keys_free(&global_keys);

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen return -1;

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen }

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen /* see if we got a key */

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen struct dcrypt_private_key *key =

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen mail_crypt_global_key_find(&global_keys, pubid);

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen if (key != NULL) {

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen dcrypt_key_ref_private(key);

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen *key_r = key;

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen ret = 1;

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen }

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen mail_crypt_global_keys_free(&global_keys);

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen return ret;

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen}

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainenconst char *mail_crypt_get_key_path(bool user_key, bool public, const char *pubid)

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen{

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen const char *ret = t_strdup_printf("%s%s%s",

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen user_key ? USER_CRYPT_PREFIX :

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen BOX_CRYPT_PREFIX,

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen public ? PUBKEYS_PREFIX :

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen PRIVKEYS_PREFIX,

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen pubid);

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen return ret;

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen}

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainenint mail_crypt_decrypt_private_key(struct mailbox *box, const char *pubid,

6d2c938f017a2fc55ae476f88839f03a3d3c5fbdTimo Sirainen const char *data,

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen struct dcrypt_private_key **key_r,

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen const char **error_r)

6d2c938f017a2fc55ae476f88839f03a3d3c5fbdTimo Sirainen{

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen enum dcrypt_key_kind key_kind;

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen enum dcrypt_key_encryption_type enc_type;

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen const char *enc_hash = NULL, *key_hash = NULL, *pw = NULL;

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen struct dcrypt_private_key *key = NULL, *dec_key = NULL;

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen struct mail_user *user = mail_storage_get_user(mailbox_get_storage(box));

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen int ret = 0;

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen i_assert(pubid != NULL);

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen i_assert(data != NULL);

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen /* see what the key needs for decrypting */

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen if (!dcrypt_key_string_get_info(data, NULL, NULL, &key_kind,

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen &enc_type, &enc_hash, &key_hash, error_r)) {

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen return -1;

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen }

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen if (key_kind != DCRYPT_KEY_KIND_PRIVATE) {

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen *error_r = t_strdup_printf("Cannot use key %s: "

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen "Expected private key, got public key",

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen pubid);

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen return -1;

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen }

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen if (key_hash != NULL && strcmp(key_hash, pubid) != 0) {

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen *error_r = t_strdup_printf("Cannot use key %s: "

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen "Incorrect key hash %s stored",

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen pubid,

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen key_hash);

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen return -1;

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen }

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen /* see if it needs decrypting */

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen if (enc_type == DCRYPT_KEY_ENCRYPTION_TYPE_NONE) {

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen /* no key or password */

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen } else if (enc_type == DCRYPT_KEY_ENCRYPTION_TYPE_PASSWORD) {

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen pw = mail_user_plugin_getenv(user, MAIL_CRYPT_USERENV_PASSWORD);

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen if (pw == NULL) {

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen *error_r = t_strdup_printf("Cannot decrypt key %s: "

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen "Password not available",

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen pubid);

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen return -1;

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen }

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen } else if (enc_type == DCRYPT_KEY_ENCRYPTION_TYPE_KEY) {

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen if ((ret = mail_crypt_user_get_private_key(user, enc_hash,

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen &dec_key, error_r)) <= 0) {

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen /* last resort, look at environment */

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen if (ret == 0 && (ret = mail_crypt_env_get_private_key(user, enc_hash,

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen &dec_key, error_r)) == 0) {

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen *error_r = t_strdup_printf("Cannot decrypt key %s: "

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen "Private key %s not available:",

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen pubid, enc_hash);

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen return -1;

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen } else if (ret < 0) {

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen *error_r = t_strdup_printf("Cannot decrypt key %s: %s",

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen pubid, *error_r);

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen return ret;

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen }

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen }

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen }

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen bool res = dcrypt_key_load_private(&key, data, pw, dec_key, error_r);

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen if (dec_key != NULL)

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen dcrypt_key_unref_private(&dec_key);

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen if (!res)

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen return -1;

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen if (mail_crypt_private_key_id_match(key, pubid, error_r) <= 0) {

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen if (key != NULL)

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen dcrypt_key_unref_private(&key);

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen return -1;

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen }

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen i_assert(key != NULL);

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen *key_r = key;

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen return 1;

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen}

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainenint mail_crypt_get_private_key(struct mailbox *box, const char *pubid,

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen bool user_key, bool shared,

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen struct dcrypt_private_key **key_r,

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen const char **error_r)

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen{

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen struct mail_user *user = mail_storage_get_user(mailbox_get_storage(box));

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen struct mail_crypt_user *muser = mail_crypt_get_mail_crypt_user(user);

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen /* check cache */

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen if (mail_crypt_get_key_cache(muser->key_cache, pubid, key_r, NULL) > 0) {

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen return 1;

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen }

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen struct mail_attribute_value value;

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen struct dcrypt_private_key *key;

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen int ret;

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen const char *attr_name = mail_crypt_get_key_path(user_key, FALSE, pubid);

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen if ((ret = mailbox_attribute_get(box,

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen shared ? MAIL_ATTRIBUTE_TYPE_SHARED :

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen MAIL_ATTRIBUTE_TYPE_PRIVATE,

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen attr_name, &value)) <= 0) {

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen if (ret < 0) {

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen *error_r = t_strdup_printf("mailbox_attribute_get(%s, %s%s) failed: %s",

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen mailbox_get_vname(box),

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen shared ? "/shared/" :

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen "/priv/",

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen attr_name,

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen mailbox_get_last_internal_error(box, NULL));

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen }

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen return ret;

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen }

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen if ((ret = mail_crypt_decrypt_private_key(box, pubid, value.value,

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen &key, error_r)) <= 0)

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen return ret;

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen i_assert(key != NULL);

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen mail_crypt_put_key_cache(&muser->key_cache, pubid, key, NULL);

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen *key_r = key;

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen return 1;

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen}

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainenint mail_crypt_user_get_private_key(struct mail_user *user, const char *pubid,

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen struct dcrypt_private_key **key_r,

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen const char **error_r)

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen{

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen struct mail_namespace *ns = mail_namespace_find_inbox(user->namespaces);

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen struct mailbox *box = mailbox_alloc(ns->list, "INBOX",

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen MAILBOX_FLAG_READONLY);

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen struct mail_attribute_value value;

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen int ret;

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen /* try retrieve currently active user key */

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen if (mailbox_open(box) < 0) {

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen *error_r = t_strdup_printf("mailbox_open(%s) failed: %s",

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen "INBOX",

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen mailbox_get_last_internal_error(box, NULL));

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen return -1;

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen }

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen if (pubid == NULL) {

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen if ((ret = mailbox_attribute_get(box, MAIL_ATTRIBUTE_TYPE_SHARED,

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen USER_CRYPT_PREFIX ACTIVE_KEY_NAME,

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen &value)) <= 0) {

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen if (ret < 0) {

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen *error_r = t_strdup_printf("mailbox_attribute_get(%s, /shared/%s) failed: %s",

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen mailbox_get_vname(box),

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen USER_CRYPT_PREFIX ACTIVE_KEY_NAME,

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen mailbox_get_last_internal_error(box, NULL));

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen }

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen } else {

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen pubid = value.value;

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen ret = 1;

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen }

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen } else

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen ret = 1;

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen /* try to open key */

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen if (ret > 0)

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen ret = mail_crypt_get_private_key(box, pubid, TRUE, FALSE,

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen key_r, error_r);

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen mailbox_free(&box);

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen return ret;

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen}

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainenint mail_crypt_box_get_private_key(struct mailbox *box,

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen struct dcrypt_private_key **key_r,

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen const char **error_r)

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen{

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen struct mail_attribute_value value;

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen int ret;

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen /* get active key */

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen if ((ret = mailbox_attribute_get(box, MAIL_ATTRIBUTE_TYPE_SHARED,

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen BOX_CRYPT_PREFIX ACTIVE_KEY_NAME, &value)) <= 0) {

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen if (ret < 0) {

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen *error_r = t_strdup_printf("mailbox_attribute_get(%s, /shared/%s) failed: %s",

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen mailbox_get_vname(box),

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen USER_CRYPT_PREFIX ACTIVE_KEY_NAME,

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen mailbox_get_last_internal_error(box, NULL));

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen }

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen return ret;

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen }

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen return mail_crypt_get_private_key(box, value.value,

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen FALSE, FALSE,

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen key_r, error_r);

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen}

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainenint mail_crypt_set_private_key(struct mailbox_transaction_context *t,

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen bool user_key, bool shared, const char *pubid,

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen struct dcrypt_public_key *enc_key,

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen struct dcrypt_private_key *key,

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen const char **error_r)

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen{

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen /* folder keys must be encrypted with some other key,

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen i_assert(user_key || shared || enc_key != NULL);

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen buffer_t *data = t_str_new(MAIL_CRYPT_KEY_BUF_SIZE);

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen const char *pw = NULL;

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen const char *algo = NULL;

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen struct mail_user *user = mail_storage_get_user(

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen mailbox_get_storage(

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen mailbox_transaction_get_mailbox(t)));

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen const char *attr_name = mail_crypt_get_key_path(user_key, FALSE, pubid);

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen struct mail_attribute_value value;

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen int ret;

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen if (enc_key != NULL) {

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen algo = MAIL_CRYPT_KEY_CIPHER;

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen } else if (user_key &&

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen (pw = mail_user_plugin_getenv(user,MAIL_CRYPT_USERENV_PASSWORD))

7bafda1813454621e03615e83d55bccfa7cc56bdTimo Sirainen != NULL) {

7bafda1813454621e03615e83d55bccfa7cc56bdTimo Sirainen algo = MAIL_CRYPT_PW_CIPHER;

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen }

7bafda1813454621e03615e83d55bccfa7cc56bdTimo Sirainen

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen /* export key */

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen if (!dcrypt_key_store_private(key, DCRYPT_FORMAT_DOVECOT, algo, data,

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen pw, enc_key, error_r)) {

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen return -1;

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen }

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen /* store it */

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen value.value_stream = NULL;

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen value.value = str_c(data);

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen value.last_change = 0;

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen if ((ret = mailbox_attribute_set(t,

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen shared ? MAIL_ATTRIBUTE_TYPE_SHARED :

7bafda1813454621e03615e83d55bccfa7cc56bdTimo Sirainen MAIL_ATTRIBUTE_TYPE_PRIVATE,

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen attr_name,

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen &value)) < 0) {

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen *error_r = t_strdup_printf("mailbox_attribute_set(%s, %s/%s) failed: %s",

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen mailbox_get_vname(mailbox_transaction_get_mailbox(t)),

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen shared ? "/shared" : "/priv",

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen attr_name,

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen mailbox_get_last_internal_error(

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen mailbox_transaction_get_mailbox(t), NULL));

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen }

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen safe_memset(buffer_get_modifiable_data(data, NULL), 0, data->used);

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen return ret;

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen}

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainenint mail_crypt_user_set_private_key(struct mail_user *user, const char *pubid,

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen struct dcrypt_private_key *key,

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen const char **error_r)

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen{

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen struct mail_namespace *ns = mail_namespace_find_inbox(user->namespaces);

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen struct mailbox *box = mailbox_alloc(ns->list, "INBOX",

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen MAILBOX_FLAG_READONLY);

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen struct dcrypt_private_key *env_key = NULL;

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen struct dcrypt_public_key *enc_key = NULL;

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen struct mailbox_transaction_context *t;

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen int ret;

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen if ((ret = mail_crypt_env_get_private_key(user, NULL, &env_key,

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen error_r)) < 0) {

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen return -1;

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen } else if (ret > 0) {

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen dcrypt_key_convert_private_to_public(env_key, &enc_key);

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen dcrypt_key_unref_private(&env_key);

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen }

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen if (mail_user_plugin_getenv(user, MAIL_CRYPT_REQUIRE_ENCRYPTED_USER_KEY) != NULL &&

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen mail_user_plugin_getenv(user, MAIL_CRYPT_USERENV_PASSWORD) == NULL &&

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen mail_user_plugin_getenv(user, MAIL_CRYPT_USERENV_KEY) == NULL)

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen {

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen *error_r = MAIL_CRYPT_REQUIRE_ENCRYPTED_USER_KEY " set, cannot "

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen "generate user keypair without password or key";

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen return -1;

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen }

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen if (mailbox_open(box) < 0) {

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen *error_r = t_strdup_printf("mailbox_open(%s) failed: %s",

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen "INBOX",

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen mailbox_get_last_internal_error(box, NULL));

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen return -1;

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen }

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen t = mailbox_transaction_begin(box, 0, __func__);

1ac7c8e9040e0d0b7e9f849e45b94bfe919595a9Timo Sirainen

if ((ret = mail_crypt_set_private_key(t, TRUE, FALSE, pubid, enc_key, key,

error_r)) < 0) {

mailbox_transaction_rollback(&t);

} else if ((ret = mailbox_transaction_commit(&t)) < 0) {

*error_r = t_strdup_printf("mailbox_transaction_commit(%s) failed: %s",

mailbox_get_vname(box),

mailbox_get_last_internal_error(box, NULL));

}

mailbox_free(&box);

return ret;

}

int mail_crypt_box_set_private_key(struct mailbox *box, const char *pubid,

struct dcrypt_private_key *key,

struct dcrypt_public_key *user_key,

const char **error_r)

{

int ret;

struct mailbox_transaction_context *t;

t = mailbox_transaction_begin(box, 0, __func__);

if ((ret = mail_crypt_set_private_key(t, FALSE, FALSE, pubid, user_key,

key, error_r)) < 0) {

mailbox_transaction_rollback(&t);

} else if ((ret = mailbox_transaction_commit(&t)) < 0) {

*error_r = t_strdup_printf("mailbox_transaction_commit(%s) failed: %s",

mailbox_get_vname(box),

mailbox_get_last_internal_error(box, NULL));

}

return ret;

}

int mail_crypt_get_public_key(struct mailbox *box, const char *pubid,

bool user_key, struct dcrypt_public_key **key_r,

const char **error_r)

{

struct mail_user *user = mail_storage_get_user(mailbox_get_storage(box));

struct mail_crypt_user *muser = mail_crypt_get_mail_crypt_user(user);

/* check cache */

if (mail_crypt_get_key_cache(muser->key_cache, pubid, NULL, key_r) > 0) {

return 1;

}

enum dcrypt_key_kind key_kind;

const char *key_hash = NULL;

struct dcrypt_public_key *key;

struct mail_attribute_value value;

int ret;

const char *attr_name = mail_crypt_get_key_path(user_key, TRUE, pubid);

if ((ret = mailbox_attribute_get(box,

MAIL_ATTRIBUTE_TYPE_SHARED,

attr_name, &value)) <= 0) {

if (ret < 0) {

*error_r = t_strdup_printf("mailbox_attribute_get(%s, %s) failed: %s",

mailbox_get_vname(box),

attr_name,

mailbox_get_last_internal_error(box, NULL));

}

return ret;

}

if (!dcrypt_key_string_get_info(value.value, NULL, NULL, &key_kind,

NULL, NULL, &key_hash, error_r)) {

return -1;

}

if (key_kind != DCRYPT_KEY_KIND_PUBLIC) {

*error_r = t_strdup_printf("Cannot use key %s: "

"Expected public key, got private key",

pubid);

return -1;

}

if (key_hash != NULL && strcmp(key_hash, pubid) != 0) {

*error_r = t_strdup_printf("Cannot use key %s: "

"Incorrect key hash %s stored",

pubid, key_hash);

return -1;

}

/* load the key */

if (!dcrypt_key_load_public(&key, value.value, error_r)) {

return -1;

}

if (pubid != NULL &&

mail_crypt_public_key_id_match(key, pubid, error_r) <= 0) {

dcrypt_key_unref_public(&key);

return -1;

}

mail_crypt_put_key_cache(&muser->key_cache, pubid, NULL, key);

*key_r = key;

return 1;

}

int mail_crypt_user_get_public_key(struct mail_user *user,

struct dcrypt_public_key **key_r,

const char **error_r)

{

struct mail_namespace *ns = mail_namespace_find_inbox(user->namespaces);

struct mailbox *box = mailbox_alloc(ns->list, "INBOX",

MAILBOX_FLAG_READONLY);

struct mail_attribute_value value;

int ret;

/* try retrieve currently active user key */

if (mailbox_open(box) < 0) {

*error_r = t_strdup_printf("mailbox_open(%s) failed: %s",

"INBOX",

mailbox_get_last_internal_error(box, NULL));

return -1;

}

if ((ret = mailbox_attribute_get(box, MAIL_ATTRIBUTE_TYPE_SHARED,

USER_CRYPT_PREFIX ACTIVE_KEY_NAME,

&value)) <= 0) {

if (ret < 0) {

*error_r = t_strdup_printf("mailbox_attribute_get(%s, /shared/%s) failed: %s",

mailbox_get_vname(box),

USER_CRYPT_PREFIX ACTIVE_KEY_NAME,

mailbox_get_last_internal_error(box, NULL));

}

} else {

ret = mail_crypt_get_public_key(box, value.value, TRUE, key_r, error_r);

}

mailbox_free(&box);

return ret;

}

int mail_crypt_box_get_public_key(struct mailbox *box,

struct dcrypt_public_key **key_r,

const char **error_r)

{

struct mail_attribute_value value;

int ret;

if ((ret = mailbox_attribute_get(box, MAIL_ATTRIBUTE_TYPE_SHARED,

BOX_CRYPT_PREFIX ACTIVE_KEY_NAME,

&value)) <= 0) {

if (ret < 0) {

*error_r = t_strdup_printf("mailbox_attribute_get(%s, /shared/%s) failed: %s",

mailbox_get_vname(box),

BOX_CRYPT_PREFIX ACTIVE_KEY_NAME,

mailbox_get_last_internal_error(box, NULL));

}

return ret;

}

return mail_crypt_get_public_key(box, value.value, FALSE, key_r, error_r);

}

int mail_crypt_set_public_key(struct mailbox_transaction_context *t,

bool user_key, const char *pubid,

struct dcrypt_public_key *key,

const char **error_r)

{

buffer_t *data = t_str_new(MAIL_CRYPT_KEY_BUF_SIZE);

const char *attr_name = mail_crypt_get_key_path(user_key, TRUE, pubid);

struct mail_attribute_value value;

/* export key */

if (!dcrypt_key_store_public(key, DCRYPT_FORMAT_DOVECOT, data,

error_r)) {

return -1;

}

/* store it */

value.value_stream = NULL;

value.value = str_c(data);

value.last_change = 0;

if (mailbox_attribute_set(t,

MAIL_ATTRIBUTE_TYPE_SHARED,

attr_name,

&value) < 0) {

*error_r = t_strdup_printf("mailbox_attribute_set(%s, %s/%s) failed: %s",

mailbox_get_vname(mailbox_transaction_get_mailbox(t)),

"/shared",

attr_name,

mailbox_get_last_internal_error(

mailbox_transaction_get_mailbox(t), NULL));

return -1;

}

return 0;

}

int mail_crypt_user_set_public_key(struct mail_user *user, const char *pubid,

struct dcrypt_public_key *key,

const char **error_r)

{

struct mail_namespace *ns = mail_namespace_find_inbox(user->namespaces);

struct mailbox *box = mailbox_alloc(ns->list, "INBOX",

MAILBOX_FLAG_READONLY);

struct mailbox_transaction_context *t;

struct mail_attribute_value value;

int ret;

/* try retrieve currently active user key */

if (mailbox_open(box) < 0) {

*error_r = t_strdup_printf("mailbox_open(%s) failed: %s",

"INBOX",

mailbox_get_last_internal_error(box, NULL));

return -1;

}

t = mailbox_transaction_begin(box, 0, __func__);

if ((ret = mail_crypt_set_public_key(t, TRUE, pubid, key,

error_r)) == 0) {

value.value_stream = NULL;

value.value = pubid;

value.last_change = 0;

if ((ret = mailbox_attribute_set(t, MAIL_ATTRIBUTE_TYPE_SHARED,

USER_CRYPT_PREFIX ACTIVE_KEY_NAME,

&value)) < 0) {

*error_r = t_strdup_printf("mailbox_attribute_set(%s, /shared/%s) failed: %s",

mailbox_get_vname(box),

USER_CRYPT_PREFIX ACTIVE_KEY_NAME,

mailbox_get_last_internal_error(box, NULL));

}

}

if (ret < 0) {

mailbox_transaction_rollback(&t);

} else if (mailbox_transaction_commit(&t) < 0) {

*error_r = t_strdup_printf("mailbox_transaction_commit(%s) failed: %s",

mailbox_get_vname(box),

mailbox_get_last_internal_error(box, NULL));

ret = -1;

}

mailbox_free(&box);

return ret;

}

int mail_crypt_box_set_public_key(struct mailbox *box, const char *pubid,

struct dcrypt_public_key *key,

const char **error_r)

{

int ret;

struct mailbox_transaction_context *t;

struct mail_attribute_value value;

t = mailbox_transaction_begin(box, 0, __func__);

if ((ret = mail_crypt_set_public_key(t, FALSE, pubid, key,

error_r)) == 0) {

value.value_stream = NULL;

value.value = pubid;

value.last_change = 0;

if ((ret = mailbox_attribute_set(t, MAIL_ATTRIBUTE_TYPE_SHARED,

BOX_CRYPT_PREFIX ACTIVE_KEY_NAME,

&value)) < 0) {

*error_r = t_strdup_printf("mailbox_attribute_set(%s, /shared/%s) failed: %s",

mailbox_get_vname(box),

BOX_CRYPT_PREFIX ACTIVE_KEY_NAME,

mailbox_get_last_internal_error(box, NULL));

}

}

if (ret < 0) {

mailbox_transaction_rollback(&t);

} else if (mailbox_transaction_commit(&t) < 0) {

*error_r = t_strdup_printf("mailbox_transaction_commit(%s) failed: %s",

mailbox_get_vname(box),

mailbox_get_last_internal_error(box, NULL));

ret = -1;

}

return ret;

}

int mail_crypt_user_set_keys(struct mail_user *user,

const char *pubid,

struct dcrypt_private_key *privkey,

struct dcrypt_public_key *pubkey,

const char **error_r)

{

if (mail_crypt_user_set_private_key(user, pubid, privkey, error_r) < 0)

return -1;

if (mail_crypt_user_set_public_key(user, pubid, pubkey, error_r) < 0)

return -1;

return 0;

}

int mail_crypt_box_set_keys(struct mailbox *box,

const char *pubid,

struct dcrypt_private_key *privkey,

struct dcrypt_public_key *user_key,

struct dcrypt_public_key *pubkey,

const char **error_r)

{

if (mail_crypt_box_set_private_key(box, pubid, privkey, user_key,

error_r) < 0)

return -1;

if (mail_crypt_box_set_public_key(box, pubid, pubkey, error_r) < 0)

return -1;

return 0;

}

int mail_crypt_box_get_shared_key(struct mailbox *box,

const char *pubid,

struct dcrypt_private_key **key_r,

const char **error_r)

{

struct mail_user *user = mail_storage_get_user(mailbox_get_storage(box));

struct mail_crypt_user *muser = mail_crypt_get_mail_crypt_user(user);

struct dcrypt_private_key *key = NULL;

struct mail_attribute_value value;

int ret;

/* check cache */

if (mail_crypt_get_key_cache(muser->key_cache, pubid, key_r, NULL) > 0) {

return 1;

}

const char *hexname =

binary_to_hex((const unsigned char*)user->username,

strlen(user->username));

const char *attr_name = t_strdup_printf(BOX_CRYPT_PREFIX

PRIVKEYS_PREFIX"%s/%s",

hexname,

pubid);

if ((ret = mailbox_attribute_get(box,

MAIL_ATTRIBUTE_TYPE_SHARED,

attr_name, &value)) <= 0) {

if (ret < 0) {

*error_r = t_strdup_printf("mailbox_attribute_get(%s, %s) failed: %s",

mailbox_get_vname(box),

attr_name,

mailbox_get_last_internal_error(box, NULL));

return ret;

}

return mail_crypt_get_private_key(box, pubid, FALSE, TRUE, key_r,

error_r);

} else {

if ((ret = mail_crypt_decrypt_private_key(box, pubid, value.value,

&key, error_r)) <= 0)

return ret;

}

mail_crypt_put_key_cache(&muser->key_cache, pubid, key, NULL);

*key_r = key;

return 1;

}

int mail_crypt_box_set_shared_key(struct mailbox_transaction_context *t,

const char *pubid,

struct dcrypt_private_key *privkey,

const char *target_uid,

struct dcrypt_public_key *user_key,

const char **error_r)

{

struct mail_attribute_value value;

buffer_t *data = t_str_new(MAIL_CRYPT_KEY_BUF_SIZE);

int ret;

const char *attr_name;

const char *algo = NULL;

i_assert(target_uid == NULL || user_key != NULL);

if (target_uid != NULL) {

/* hash target UID */

algo = MAIL_CRYPT_KEY_CIPHER;

const char *hexname =

binary_to_hex((const unsigned char*)target_uid,

strlen(target_uid));

attr_name = t_strdup_printf(BOX_CRYPT_PREFIX

PRIVKEYS_PREFIX"%s/%s",

hexname,

pubid);

} else {

attr_name = t_strdup_printf(BOX_CRYPT_PREFIX

PRIVKEYS_PREFIX"%s",

pubid);

}

if (!dcrypt_key_store_private(privkey, DCRYPT_FORMAT_DOVECOT,

algo, data,

NULL, user_key, error_r)) {

return -1;

}

value.value_stream = NULL;

value.value = str_c(data);

value.last_change = 0;

if ((ret = mailbox_attribute_set(t, MAIL_ATTRIBUTE_TYPE_SHARED,

attr_name, &value)) < 0) {

*error_r = t_strdup_printf("mailbox_attribute_set(%s, /shared/%s) failed: %s",

mailbox_get_vname(

mailbox_transaction_get_mailbox(t)),

attr_name,

mailbox_get_last_internal_error(

mailbox_transaction_get_mailbox(t),

NULL));

}

safe_memset(buffer_get_modifiable_data(data, NULL), 0, data->used);

return ret;

}

int mail_crypt_box_unset_shared_key(struct mailbox_transaction_context *t,

const char *pubid,

const char *target_uid,

const char **error_r)

{

int ret;

const char *hexname =

binary_to_hex((const unsigned char*)target_uid,

strlen(target_uid));

const char *attr_name = t_strdup_printf(BOX_CRYPT_PREFIX

PRIVKEYS_PREFIX"%s/%s",

hexname,

pubid);

if ((ret = mailbox_attribute_unset(t, MAIL_ATTRIBUTE_TYPE_SHARED,

attr_name)) <= 0) {

if (ret < 0) {

*error_r = t_strdup_printf("mailbox_attribute_unset(%s, "

" /shared/%s): failed: %s",

mailbox_get_vname(

mailbox_transaction_get_mailbox(t)),

attr_name,

mailbox_get_last_internal_error(

mailbox_transaction_get_mailbox(t),

NULL));

}

}

return ret;

}

int mail_crypt_generate_keypair(const char *curve,

struct dcrypt_keypair *pair_r,

const char **pubid_r,

const char **error_r)

{

if (curve == NULL) {

*error_r = MAIL_CRYPT_USERENV_CURVE " not set, cannot generate EC key";

return -1;

}

if (!dcrypt_keypair_generate(pair_r, DCRYPT_KEY_EC, 0, curve, error_r)) {

return -1;

}

buffer_t *key_id = t_str_new(MAIL_CRYPT_HASH_BUF_SIZE);

if (!dcrypt_key_id_public(pair_r->pub, MAIL_CRYPT_KEY_ID_ALGORITHM, key_id,

error_r)) {

dcrypt_keypair_unref(pair_r);

return -1;

}

*pubid_r = binary_to_hex(key_id->data, key_id->used);

return 0;

}

int mail_crypt_user_generate_keypair(struct mail_user *user,

struct dcrypt_keypair *pair,

const char **pubid_r,

const char **error_r)

{

struct mail_crypt_user *muser = mail_crypt_get_mail_crypt_user(user);

const char *curve = mail_user_plugin_getenv(user, MAIL_CRYPT_USERENV_CURVE);

if (mail_crypt_generate_keypair(curve, pair, pubid_r, error_r) < 0) {

return -1;

}

if (mail_crypt_user_set_keys(user, *pubid_r,

pair->priv, pair->pub, error_r) < 0) {

dcrypt_keypair_unref(pair);

return -1;

}

mail_crypt_put_key_cache(&muser->key_cache, *pubid_r, pair->priv, pair->pub);

return 0;

}

int mail_crypt_box_generate_keypair(struct mailbox *box,

struct dcrypt_keypair *pair,

struct dcrypt_public_key *user_key,

const char **pubid_r,

const char **error_r)

{

int ret;

struct mail_user *user = mail_storage_get_user(mailbox_get_storage(box));

struct mail_crypt_user *muser = mail_crypt_get_mail_crypt_user(user);

const char *curve = mail_user_plugin_getenv(user,

MAIL_CRYPT_USERENV_CURVE);

if (user_key == NULL) {

if ((ret = mail_crypt_user_get_public_key(user,

&user_key,

error_r)) <= 0) {

if (ret < 0)

return ret;

/* generate keypair */

struct dcrypt_keypair user_pair;

const char *user_pubid;

if (mail_crypt_user_generate_keypair(user, &user_pair,

&user_pubid,

error_r) < 0) {

return -1;

}

mail_crypt_put_key_cache(&muser->key_cache, user_pubid,

user_pair.priv, user_pair.pub);

user_key = user_pair.pub;

dcrypt_key_unref_private(&user_pair.priv);

}

} else {

dcrypt_key_ref_public(user_key);

}

if ((ret = mail_crypt_generate_keypair(curve, pair, pubid_r, error_r)) < 0) {

/* failed */

} else if ((ret = mail_crypt_box_set_keys(box, *pubid_r,

pair->priv, user_key, pair->pub,

error_r)) < 0) {

dcrypt_keypair_unref(pair);

} else {

mail_crypt_put_key_cache(&muser->key_cache, *pubid_r, pair->priv,

pair->pub);

}

dcrypt_key_unref_public(&user_key);

return ret;

}

int mail_crypt_box_get_pvt_digests(struct mailbox *box, pool_t pool,

enum mail_attribute_type type,

ARRAY_TYPE(const_string) *digests,

const char **error_r)

{

struct mailbox_attribute_iter *iter;

const char *key;

int ret;

iter = mailbox_attribute_iter_init(box, type,

BOX_CRYPT_PREFIX PRIVKEYS_PREFIX);

while ((key = mailbox_attribute_iter_next(iter)) != NULL) {

key = p_strdup(pool, key);

array_append(digests, &key, 1);

}

ret = mailbox_attribute_iter_deinit(&iter);

if (ret < 0)

*error_r = mailbox_get_last_internal_error(box, NULL);

return ret;

}

int mail_crypt_box_get_private_keys(struct mailbox *box,

ARRAY_TYPE(dcrypt_private_key) *keys_r,

const char **error_r)

{

struct mailbox_attribute_iter *iter;

iter = mailbox_attribute_iter_init(box, MAIL_ATTRIBUTE_TYPE_PRIVATE,

BOX_CRYPT_PREFIX PRIVKEYS_PREFIX);

const char *id;

int ret;

while ((id = mailbox_attribute_iter_next(iter)) != NULL) {

struct dcrypt_private_key *key = NULL;

if ((ret = mail_crypt_get_private_key(box, id, FALSE, FALSE,

&key, error_r)) < 0) {

(void)mailbox_attribute_iter_deinit(&iter);

return -1;

} else if (ret > 0)

array_append(keys_r, &key, 1);

}

ret = mailbox_attribute_iter_deinit(&iter);

if (ret < 0)

*error_r = mailbox_get_last_internal_error(box, NULL);

return ret;

}

int mail_crypt_box_share_private_keys(struct mailbox_transaction_context *t,

struct dcrypt_public_key *dest_pub_key,

const char *dest_user,

const ARRAY_TYPE(dcrypt_private_key) *priv_keys,

const char **error_r)

{

i_assert(dest_user == NULL || dest_pub_key != NULL);

struct dcrypt_private_key *const *priv_keyp, *priv_key;

buffer_t *key_id = t_str_new(MAIL_CRYPT_HASH_BUF_SIZE);

int ret = 0;

array_foreach(priv_keys, priv_keyp) {

priv_key = *priv_keyp;

ret = -1;

if (!dcrypt_key_id_private(priv_key, MAIL_CRYPT_KEY_ID_ALGORITHM,

key_id, error_r) ||

(ret = mail_crypt_box_set_shared_key(t,

binary_to_hex(key_id->data,

key_id->used),

priv_key, dest_user,

dest_pub_key, error_r)) < 0)

break;

}

return ret;

}

mail_crypt_user_get_or_gen_public_key(struct mail_user *user,

struct dcrypt_public_key **pub_r,

const char **error_r)

{

i_assert(user != NULL);

i_assert(pub_r != NULL);

i_assert(error_r != NULL);

int ret;

if ((ret = mail_crypt_user_get_public_key(user, pub_r, error_r)) == 0) {

struct dcrypt_keypair pair;

const char *pubid = NULL;

if (mail_crypt_user_generate_keypair(user, &pair,

&pubid, error_r) < 0) {

return -1;

}

*pub_r = pair.pub;

dcrypt_key_unref_private(&pair.priv);

} else

return ret;

return 0;

}

mail_crypt_box_get_or_gen_public_key(struct mailbox *box,

struct dcrypt_public_key **pub_r,

const char **error_r)

{

i_assert(box != NULL);

i_assert(pub_r != NULL);

i_assert(error_r != NULL);

struct mail_user *user =

mail_storage_get_user(mailbox_get_storage(box));

int ret;

if ((ret = mail_crypt_box_get_public_key(box, pub_r, error_r)) == 0) {

struct dcrypt_public_key *user_key;

if (mail_crypt_user_get_or_gen_public_key(user, &user_key,

error_r) < 0) {

return -1;

}

struct dcrypt_keypair pair;

const char *pubid = NULL;

if (mail_crypt_box_generate_keypair(box, &pair, user_key,

&pubid, error_r) < 0) {

return -1;

}

*pub_r = pair.pub;

dcrypt_key_unref_public(&user_key);

dcrypt_key_unref_private(&pair.priv);

} else

return ret;

return 0;

}

bool mail_crypt_acl_secure_sharing_enabled(struct mail_user *user)

{

const char *env =

mail_user_plugin_getenv(user, MAIL_CRYPT_ACL_SECURE_SHARE_SETTING);

/* disabled by default */

bool ret = FALSE;

if (env != NULL) {

/* enable unless specifically

ret = TRUE;

switch (env[0]) {

case 'n':

case 'N':

case '0':

case 'f':

case 'F':

ret = FALSE;

}

}

return ret;

}

static const struct mailbox_attribute_internal mailbox_internal_attributes[] = {

{ .type = MAIL_ATTRIBUTE_TYPE_PRIVATE,

.key = BOX_CRYPT_PREFIX,

.flags = MAIL_ATTRIBUTE_INTERNAL_FLAG_CHILDREN

},

{ .type = MAIL_ATTRIBUTE_TYPE_SHARED,

.key = BOX_CRYPT_PREFIX,

.flags = MAIL_ATTRIBUTE_INTERNAL_FLAG_CHILDREN

},

{ .type = MAIL_ATTRIBUTE_TYPE_PRIVATE,

.key = USER_CRYPT_PREFIX,

.flags = MAIL_ATTRIBUTE_INTERNAL_FLAG_CHILDREN

},

{ .type = MAIL_ATTRIBUTE_TYPE_SHARED,

.key = USER_CRYPT_PREFIX,

.flags = MAIL_ATTRIBUTE_INTERNAL_FLAG_CHILDREN

}

};

void mail_crypt_key_register_mailbox_internal_attributes(void)

{

mailbox_attribute_register_internals(mailbox_internal_attributes,

N_ELEMENTS(mailbox_internal_attributes));

}