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upstream: Support keys that set the CKA_ALWAYS_AUTHENTICATE by

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requring a fresh login after the C_SignInit operation.

based on patch from Jakub Jelen in bz#2638; ok markus

OpenBSD-Commit-ID: a76e66996ba7c0923b46b74d46d499b811786661
This commit is contained in:
djm@openbsd.org 2019-01-22 12:00:50 +00:00 committed by Damien Miller
parent 7a2cb18a21
commit 2162171ad5
1 changed files with 95 additions and 26 deletions
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121
ssh-pkcs11.c
View File

@ -1,4 +1,4 @@
/* $OpenBSD: ssh-pkcs11.c,v 1.39 2019/01/21 02:05:38 djm Exp $ */
/* $OpenBSD: ssh-pkcs11.c,v 1.40 2019/01/22 12:00:50 djm Exp $ */
/*
* Copyright (c) 2010 Markus Friedl. All rights reserved.
* Copyright (c) 2014 Pedro Martelletto. All rights reserved.
@ -239,6 +239,85 @@ pkcs11_find(struct pkcs11_provider *p, CK_ULONG slotidx, CK_ATTRIBUTE *attr,
return (ret);
}
static int
pkcs11_login(struct pkcs11_key *k11, CK_USER_TYPE type)
{
struct pkcs11_slotinfo *si;
CK_FUNCTION_LIST *f;
char *pin = NULL, prompt[1024];
CK_RV rv;
if (!k11->provider || !k11->provider->valid) {
error("no pkcs11 (valid) provider found");
return (-1);
}
f = k11->provider->function_list;
si = &k11->provider->slotinfo[k11->slotidx];
if (!pkcs11_interactive) {
error("need pin entry%s",
(si->token.flags & CKF_PROTECTED_AUTHENTICATION_PATH) ?
" on reader keypad" : "");
return (-1);
}
if (si->token.flags & CKF_PROTECTED_AUTHENTICATION_PATH)
verbose("Deferring PIN entry to reader keypad.");
else {
snprintf(prompt, sizeof(prompt), "Enter PIN for '%s': ",
si->token.label);
if ((pin = read_passphrase(prompt, RP_ALLOW_EOF)) == NULL) {
debug("%s: no pin specified", __func__);
return (-1); /* bail out */
}
}
rv = f->C_Login(si->session, type, (u_char *)pin,
(pin != NULL) ? strlen(pin) : 0);
if (pin != NULL)
freezero(pin, strlen(pin));
if (rv != CKR_OK && rv != CKR_USER_ALREADY_LOGGED_IN) {
error("C_Login failed: %lu", rv);
return (-1);
}
si->logged_in = 1;
return (0);
}
static int
pkcs11_check_obj_bool_attrib(struct pkcs11_key *k11, CK_OBJECT_HANDLE obj,
CK_ATTRIBUTE_TYPE type, int *val)
{
struct pkcs11_slotinfo *si;
CK_FUNCTION_LIST *f;
CK_BBOOL flag = 0;
CK_ATTRIBUTE attr;
CK_RV rv;
*val = 0;
if (!k11->provider || !k11->provider->valid) {
error("no pkcs11 (valid) provider found");
return (-1);
}
f = k11->provider->function_list;
si = &k11->provider->slotinfo[k11->slotidx];
attr.type = type;
attr.pValue = &flag;
attr.ulValueLen = sizeof(flag);
rv = f->C_GetAttributeValue(si->session, obj, &attr, 1);
if (rv != CKR_OK) {
error("C_GetAttributeValue failed: %lu", rv);
return (-1);
}
*val = flag != 0;
debug("%s: provider %p slot %lu object %lu: attrib %lu = %d",
__func__, k11->provider, k11->slotidx, obj, type, *val);
return (0);
}
static int
pkcs11_get_key(struct pkcs11_key *k11, CK_MECHANISM_TYPE mech_type)
{
@ -250,7 +329,8 @@ pkcs11_get_key(struct pkcs11_key *k11, CK_MECHANISM_TYPE mech_type)
CK_BBOOL true_val;
CK_MECHANISM mech;
CK_ATTRIBUTE key_filter[3];
char *pin = NULL, prompt[1024];
int always_auth = 0;
int did_login = 0;
if (!k11->provider || !k11->provider->valid) {
error("no pkcs11 (valid) provider found");
@ -261,32 +341,11 @@ pkcs11_get_key(struct pkcs11_key *k11, CK_MECHANISM_TYPE mech_type)
si = &k11->provider->slotinfo[k11->slotidx];
if ((si->token.flags & CKF_LOGIN_REQUIRED) && !si->logged_in) {
if (!pkcs11_interactive) {
error("need pin entry%s", (si->token.flags &
CKF_PROTECTED_AUTHENTICATION_PATH) ?
" on reader keypad" : "");
if (pkcs11_login(k11, CKU_USER) < 0) {
error("login failed");
return (-1);
}
if (si->token.flags & CKF_PROTECTED_AUTHENTICATION_PATH)
verbose("Deferring PIN entry to reader keypad.");
else {
snprintf(prompt, sizeof(prompt),
"Enter PIN for '%s': ", si->token.label);
pin = read_passphrase(prompt, RP_ALLOW_EOF);
if (pin == NULL)
return (-1); /* bail out */
}
rv = f->C_Login(si->session, CKU_USER, (u_char *)pin,
(pin != NULL) ? strlen(pin) : 0);
if (pin != NULL) {
explicit_bzero(pin, strlen(pin));
free(pin);
}
if (rv != CKR_OK && rv != CKR_USER_ALREADY_LOGGED_IN) {
error("C_Login failed: %lu", rv);
return (-1);
}
si->logged_in = 1;
did_login = 1;
}
memset(&key_filter, 0, sizeof(key_filter));
@ -321,6 +380,16 @@ pkcs11_get_key(struct pkcs11_key *k11, CK_MECHANISM_TYPE mech_type)
return (-1);
}
pkcs11_check_obj_bool_attrib(k11, obj, CKA_ALWAYS_AUTHENTICATE,
&always_auth); /* ignore errors here */
if (always_auth && !did_login) {
debug("%s: always-auth key", __func__);
if (pkcs11_login(k11, CKU_CONTEXT_SPECIFIC) < 0) {
error("login failed for always-auth key");
return (-1);
}
}
return (0);
}