int
check_pubkey_algo( int algo )
{
return check_pubkey_algo2( algo, 0 );
}
/****************
* Get the session key from a pubkey enc packet and return
* it in DEK, which should have been allocated in secure memory.
*/
int
get_session_key( PKT_pubkey_enc *k, DEK *dek )
{
PKT_secret_key *sk = NULL;
int rc;
rc = check_pubkey_algo2 (k->pubkey_algo, PUBKEY_USAGE_ENC);
if( rc )
goto leave;
if( (k->keyid[0] || k->keyid[1]) && !opt.try_all_secrets ) {
sk = xmalloc_clear( sizeof *sk );
sk->pubkey_algo = k->pubkey_algo; /* we want a pubkey with this algo*/
if( !(rc = get_seckey( sk, k->keyid )) )
rc = get_it( k, dek, sk, k->keyid );
}
else { /* anonymous receiver: Try all available secret keys */
void *enum_context = NULL;
u32 keyid[2];
char *p;
for(;;) {
if( sk )
free_secret_key( sk );
sk = xmalloc_clear( sizeof *sk );
rc=enum_secret_keys( &enum_context, sk, 1, 0);
if( rc ) {
rc = G10ERR_NO_SECKEY;
break;
}
if( sk->pubkey_algo != k->pubkey_algo )
continue;
keyid_from_sk( sk, keyid );
log_info(_("anonymous recipient; trying secret key %s ...\n"),
keystr(keyid));
if(!opt.try_all_secrets && !is_status_enabled())
{
p=get_last_passphrase();
set_next_passphrase(p);
xfree(p);
}
rc = check_secret_key( sk, opt.try_all_secrets?1:-1 ); /* ask
only
once */
if( !rc )
{
rc = get_it( k, dek, sk, keyid );
/* Successfully checked the secret key (either it was
a card, had no passphrase, or had the right
passphrase) but couldn't decrypt the session key,
so thus that key is not the anonymous recipient.
Move the next passphrase into last for the next
round. We only do this if the secret key was
successfully checked as in the normal case,
check_secret_key handles this for us via
passphrase_to_dek */
if(rc)
next_to_last_passphrase();
}
if( !rc )
{
log_info(_("okay, we are the anonymous recipient.\n") );
break;
}
}
enum_secret_keys( &enum_context, NULL, 0, 0 ); /* free context */
}
leave:
if( sk )
free_secret_key( sk );
return rc;
}
int
build_sk_list( STRLIST locusr, SK_LIST *ret_sk_list,
int unlock, unsigned int use )
{
SK_LIST sk_list = NULL;
int rc;
if( !locusr )
{ /* use the default one */
PKT_secret_key *sk;
sk = xmalloc_clear( sizeof *sk );
sk->req_usage = use;
if( (rc = get_seckey_byname( sk, NULL, unlock )) ) {
free_secret_key( sk ); sk = NULL;
log_error("no default secret key: %s\n", g10_errstr(rc) );
}
else if( !(rc=check_pubkey_algo2(sk->pubkey_algo, use)) )
{
SK_LIST r;
if( random_is_faked() && !is_insecure( sk ) )
{
log_info(_("key is not flagged as insecure - "
"can't use it with the faked RNG!\n"));
free_secret_key( sk ); sk = NULL;
}
else
{
r = xmalloc( sizeof *r );
r->sk = sk; sk = NULL;
r->next = sk_list;
r->mark = 0;
sk_list = r;
}
}
else
{
free_secret_key( sk ); sk = NULL;
log_error("invalid default secret key: %s\n", g10_errstr(rc) );
}
}
else {
STRLIST locusr_orig = locusr;
for(; locusr; locusr = locusr->next ) {
PKT_secret_key *sk;
rc = 0;
/* Do an early check agains duplicated entries. However this
* won't catch all duplicates because the user IDs may be
* specified in different ways.
*/
if ( is_duplicated_entry ( locusr_orig, locusr ) )
{
log_error(_("skipped \"%s\": duplicated\n"), locusr->d );
continue;
}
sk = xmalloc_clear( sizeof *sk );
sk->req_usage = use;
if( (rc = get_seckey_byname( sk, locusr->d, 0 )) )
{
free_secret_key( sk ); sk = NULL;
log_error(_("skipped \"%s\": %s\n"),
locusr->d, g10_errstr(rc) );
}
else if ( key_present_in_sk_list(sk_list, sk) == 0) {
free_secret_key(sk); sk = NULL;
log_info(_("skipped: secret key already present\n"));
}
else if ( unlock && (rc = check_secret_key( sk, 0 )) )
{
free_secret_key( sk ); sk = NULL;
log_error(_("skipped \"%s\": %s\n"),
locusr->d, g10_errstr(rc) );
}
else if( !(rc=check_pubkey_algo2(sk->pubkey_algo, use)) ) {
SK_LIST r;
if( sk->version == 4 && (use & PUBKEY_USAGE_SIG)
&& sk->pubkey_algo == PUBKEY_ALGO_ELGAMAL_E )
{
log_info(_("skipped \"%s\": %s\n"),locusr->d,
_("this is a PGP generated Elgamal key which"
" is not secure for signatures!"));
free_secret_key( sk ); sk = NULL;
}
else if( random_is_faked() && !is_insecure( sk ) ) {
log_info(_("key is not flagged as insecure - "
"can't use it with the faked RNG!\n"));
free_secret_key( sk ); sk = NULL;
}
else {
r = xmalloc( sizeof *r );
r->sk = sk; sk = NULL;
r->next = sk_list;
r->mark = 0;
sk_list = r;
}
}
else {
free_secret_key( sk ); sk = NULL;
log_error("skipped \"%s\": %s\n", locusr->d, g10_errstr(rc) );
}
}
}
if( !rc && !sk_list ) {
log_error("no valid signators\n");
rc = G10ERR_NO_USER_ID;
}
if( rc )
release_sk_list( sk_list );
else
*ret_sk_list = sk_list;
return rc;
}
/* This is the central function to collect the keys for recipients.
It is thus used to prepare a public key encryption. encrypt-to
keys, default keys and the keys for the actual recipients are all
collected here. When not in batch mode and no recipient has been
passed on the commandline, the function will also ask for
recipients.
RCPTS is a string list with the recipients; NULL is an allowed
value but not very useful. Group expansion is done on these names;
they may be in any of the user Id formats we can handle. The flags
bits for each string in the string list are used for:
Bit 0: This is an encrypt-to recipient.
Bit 1: This is a hidden recipient.
USE is the desired use for the key - usually PUBKEY_USAGE_ENC.
RET_PK_LIST.
On success a list of keys is stored at the address RET_PK_LIST; the
caller must free this list. On error the value at this address is
not changed.
*/
int
build_pk_list( STRLIST rcpts, PK_LIST *ret_pk_list, unsigned int use )
{
PK_LIST pk_list = NULL;
PKT_public_key *pk=NULL;
int rc=0;
int any_recipients=0;
STRLIST rov,remusr;
char *def_rec = NULL;
/* Try to expand groups if any have been defined. */
if (opt.grouplist)
remusr = expand_group (rcpts);
else
remusr = rcpts;
/* Check whether there are any recipients in the list and build the
* list of the encrypt-to ones (we always trust them). */
for ( rov = remusr; rov; rov = rov->next )
{
if ( !(rov->flags & 1) )
{
/* This is a regular recipient; i.e. not an encrypt-to
one. */
any_recipients = 1;
/* Hidden recipients are not allowed while in PGP mode,
issue a warning and switch into GnuPG mode. */
if ((rov->flags&2) && (PGP2 || PGP6 || PGP7 || PGP8))
{
log_info(_("you may not use %s while in %s mode\n"),
"--hidden-recipient",
compliance_option_string());
compliance_failure();
}
}
else if ( (use & PUBKEY_USAGE_ENC) && !opt.no_encrypt_to )
{
/* Encryption has been requested and --encrypt-to has not
been disabled. Check this encrypt-to key. */
pk = xmalloc_clear( sizeof *pk );
pk->req_usage = use;
/* We explicitly allow encrypt-to to an disabled key; thus
we pass 1 as last argument. */
if ( (rc = get_pubkey_byname ( pk, rov->d, NULL, NULL, 1 )) )
{
free_public_key ( pk ); pk = NULL;
log_error (_("%s: skipped: %s\n"), rov->d, g10_errstr(rc) );
write_status_text_and_buffer (STATUS_INV_RECP, "0 ",
rov->d, strlen (rov->d), -1);
goto fail;
}
else if ( !(rc=check_pubkey_algo2 (pk->pubkey_algo, use )) )
{
/* Skip the actual key if the key is already present
* in the list. Add it to our list if not. */
if (key_present_in_pk_list(pk_list, pk) == 0)
{
free_public_key (pk); pk = NULL;
log_info (_("%s: skipped: public key already present\n"),
rov->d);
}
else
{
PK_LIST r;
r = xmalloc( sizeof *r );
r->pk = pk; pk = NULL;
r->next = pk_list;
r->flags = (rov->flags&2)?1:0;
pk_list = r;
/* Hidden encrypt-to recipients are not allowed while
in PGP mode, issue a warning and switch into
GnuPG mode. */
if ((r->flags&1) && (PGP2 || PGP6 || PGP7 || PGP8))
{
log_info(_("you may not use %s while in %s mode\n"),
"--hidden-encrypt-to",
compliance_option_string());
compliance_failure();
}
}
}
else
{
/* The public key is not usable for encryption or not
available. */
free_public_key( pk ); pk = NULL;
log_error(_("%s: skipped: %s\n"), rov->d, g10_errstr(rc) );
write_status_text_and_buffer (STATUS_INV_RECP, "0 ",
rov->d, strlen (rov->d), -1);
goto fail;
}
}
}
/* If we don't have any recipients yet and we are not in batch mode
drop into interactive selection mode. */
if ( !any_recipients && !opt.batch )
{
int have_def_rec;
char *answer = NULL;
STRLIST backlog = NULL;
if (pk_list)
any_recipients = 1;
def_rec = default_recipient();
have_def_rec = !!def_rec;
if ( !have_def_rec )
tty_printf(_("You did not specify a user ID. (you may use \"-r\")\n"));
for (;;)
{
rc = 0;
xfree(answer);
if ( have_def_rec )
{
/* A default recipient is taken as the first entry. */
answer = def_rec;
def_rec = NULL;
}
else if (backlog)
{
/* This is part of our trick to expand and display groups. */
answer = pop_strlist (&backlog);
}
else
{
/* Show the list of already collected recipients and ask
for more. */
PK_LIST iter;
tty_printf("\n");
tty_printf(_("Current recipients:\n"));
for (iter=pk_list;iter;iter=iter->next)
{
u32 keyid[2];
keyid_from_pk(iter->pk,keyid);
tty_printf("%4u%c/%s %s \"",
nbits_from_pk(iter->pk),
pubkey_letter(iter->pk->pubkey_algo),
keystr(keyid),
datestr_from_pk(iter->pk));
if (iter->pk->user_id)
tty_print_utf8_string(iter->pk->user_id->name,
iter->pk->user_id->len);
else
{
size_t n;
char *p = get_user_id( keyid, &n );
tty_print_utf8_string( p, n );
xfree(p);
}
tty_printf("\"\n");
}
answer = cpr_get_utf8("pklist.user_id.enter",
_("\nEnter the user ID. "
"End with an empty line: "));
trim_spaces(answer);
cpr_kill_prompt();
}
if ( !answer || !*answer )
{
xfree(answer);
break; /* No more recipients entered - get out of loop. */
}
/* Do group expand here too. The trick here is to continue
the loop if any expansion occured. The code above will
then list all expanded keys. */
if (expand_id(answer,&backlog,0))
continue;
/* Get and check key for the current name. */
if (pk)
free_public_key (pk);
pk = xmalloc_clear( sizeof *pk );
pk->req_usage = use;
rc = get_pubkey_byname( pk, answer, NULL, NULL, 0 );
if (rc)
tty_printf(_("No such user ID.\n"));
else if ( !(rc=check_pubkey_algo2(pk->pubkey_algo, use)) )
{
if ( have_def_rec )
{
/* No validation for a default recipient. */
if (!key_present_in_pk_list(pk_list, pk))
{
free_public_key (pk); pk = NULL;
log_info (_("skipped: public key "
"already set as default recipient\n") );
}
else
{
PK_LIST r = xmalloc (sizeof *r);
r->pk = pk; pk = NULL;
r->next = pk_list;
r->flags = 0; /* No throwing default ids. */
pk_list = r;
}
any_recipients = 1;
continue;
}
else
{ /* Check validity of this key. */
int trustlevel;
trustlevel = get_validity (pk, pk->user_id);
if ( (trustlevel & TRUST_FLAG_DISABLED) )
{
tty_printf (_("Public key is disabled.\n") );
}
else if ( do_we_trust_pre (pk, trustlevel) )
{
/* Skip the actual key if the key is already
* present in the list */
if (!key_present_in_pk_list(pk_list, pk))
{
free_public_key(pk); pk = NULL;
log_info(_("skipped: public key already set\n") );
}
else
{
PK_LIST r;
r = xmalloc( sizeof *r );
r->pk = pk; pk = NULL;
r->next = pk_list;
r->flags = 0; /* No throwing interactive ids. */
pk_list = r;
}
any_recipients = 1;
continue;
}
}
}
xfree(def_rec); def_rec = NULL;
have_def_rec = 0;
}
if ( pk )
{
free_public_key( pk );
pk = NULL;
}
}
else if ( !any_recipients && (def_rec = default_recipient()) )
{
/* We are in batch mode and have only a default recipient. */
pk = xmalloc_clear( sizeof *pk );
pk->req_usage = use;
/* The default recipient is allowed to be disabled; thus pass 1
as last argument. */
rc = get_pubkey_byname (pk, def_rec, NULL, NULL, 1);
if (rc)
log_error(_("unknown default recipient \"%s\"\n"), def_rec );
else if ( !(rc=check_pubkey_algo2(pk->pubkey_algo, use)) )
{
/* Mark any_recipients here since the default recipient
would have been used if it wasn't already there. It
doesn't really matter if we got this key from the default
recipient or an encrypt-to. */
any_recipients = 1;
if (!key_present_in_pk_list(pk_list, pk))
log_info (_("skipped: public key already set "
"as default recipient\n"));
else
{
PK_LIST r = xmalloc( sizeof *r );
r->pk = pk; pk = NULL;
r->next = pk_list;
r->flags = 0; /* No throwing default ids. */
pk_list = r;
}
}
if ( pk )
{
free_public_key( pk );
pk = NULL;
}
xfree(def_rec); def_rec = NULL;
}
else
{
/* General case: Check all keys. */
any_recipients = 0;
for (; remusr; remusr = remusr->next )
{
if ( (remusr->flags & 1) )
continue; /* encrypt-to keys are already handled. */
pk = xmalloc_clear( sizeof *pk );
pk->req_usage = use;
if ( (rc = get_pubkey_byname( pk, remusr->d, NULL, NULL, 0 )) )
{
/* Key not found or other error. */
free_public_key( pk ); pk = NULL;
log_error(_("%s: skipped: %s\n"), remusr->d, g10_errstr(rc) );
write_status_text_and_buffer (STATUS_INV_RECP, "0 ",
remusr->d, strlen (remusr->d),
-1);
goto fail;
}
else if ( !(rc=check_pubkey_algo2(pk->pubkey_algo, use )) )
{
/* Key found and usable. Check validity. */
int trustlevel;
trustlevel = get_validity (pk, pk->user_id);
if ( (trustlevel & TRUST_FLAG_DISABLED) )
{
/*Key has been disabled. */
free_public_key(pk); pk = NULL;
log_info(_("%s: skipped: public key is disabled\n"),
remusr->d);
write_status_text_and_buffer (STATUS_INV_RECP, "0 ",
remusr->d,
strlen (remusr->d),
-1);
rc=G10ERR_UNU_PUBKEY;
goto fail;
}
else if ( do_we_trust_pre( pk, trustlevel ) )
{
/* Note: do_we_trust may have changed the trustlevel */
/* We have at least one valid recipient. It doesn't
* matters if this recipient is already present. */
any_recipients = 1;
/* Skip the actual key if the key is already present
* in the list */
if (!key_present_in_pk_list(pk_list, pk))
{
free_public_key(pk); pk = NULL;
log_info(_("%s: skipped: public key already present\n"),
remusr->d);
}
else
{
PK_LIST r;
r = xmalloc( sizeof *r );
r->pk = pk; pk = NULL;
r->next = pk_list;
r->flags = (remusr->flags&2)?1:0;
pk_list = r;
}
}
else
{ /* We don't trust this key. */
free_public_key( pk ); pk = NULL;
write_status_text_and_buffer (STATUS_INV_RECP, "10 ",
remusr->d,
strlen (remusr->d),
-1);
rc=G10ERR_UNU_PUBKEY;
goto fail;
}
}
else
{
/* Key found but not usable for us (e.g. sign-only key). */
free_public_key( pk ); pk = NULL;
write_status_text_and_buffer (STATUS_INV_RECP, "0 ",
remusr->d,
strlen (remusr->d),
-1);
log_error(_("%s: skipped: %s\n"), remusr->d, g10_errstr(rc) );
goto fail;
}
}
}
if ( !rc && !any_recipients )
{
log_error(_("no valid addressees\n"));
write_status_text (STATUS_NO_RECP, "0");
rc = G10ERR_NO_USER_ID;
}
fail:
if ( rc )
release_pk_list( pk_list );
else
*ret_pk_list = pk_list;
if (opt.grouplist)
free_strlist(remusr);
return rc;
}
