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crypto/pkcs12: facilitate accessing data with non-interoperable password. 

Originally PKCS#12 subroutines treated password strings as ASCII.
It worked as long as they were pure ASCII, but if there were some
none-ASCII characters result was non-interoperable. But fixing it
poses problem accessing data protected with broken password. In
order to make asscess to old data possible add retry with old-style
password.

Reviewed-by: Richard Levitte <levitte@openssl.org>
This commit is contained in:
Andy Polyakov 2016-07-26 16:42:41 +02:00
parent b799aef863
commit 1194ea8dc3
8 changed files with 144 additions and 27 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
.gitattributes vendored
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@ -1,2 +1,3 @@
*.der binary
/fuzz/corpora/** binary
*.pfx binary

31
crypto/pkcs12/p12_crpt.c
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@ -17,6 +17,16 @@ void PKCS12_PBE_add(void)
{
}
#undef PKCS12_key_gen
/*
* See p12_multi.c:PKCS12_verify_mac() for details...
*/
extern int (*PKCS12_key_gen)(const char *pass, int passlen,
unsigned char *salt, int slen,
int id, int iter, int n,
unsigned char *out,
const EVP_MD *md_type);
int PKCS12_PBE_keyivgen(EVP_CIPHER_CTX *ctx, const char *pass, int passlen,
ASN1_TYPE *param, const EVP_CIPHER *cipher,
const EVP_MD *md, int en_de)
@ -25,6 +35,19 @@ int PKCS12_PBE_keyivgen(EVP_CIPHER_CTX *ctx, const char *pass, int passlen,
int saltlen, iter, ret;
unsigned char *salt;
unsigned char key[EVP_MAX_KEY_LENGTH], iv[EVP_MAX_IV_LENGTH];
int (*pkcs12_key_gen)(const char *pass, int passlen,
unsigned char *salt, int slen,
int id, int iter, int n,
unsigned char *out,
const EVP_MD *md_type);
if (PKCS12_key_gen == NULL || en_de)
/*
* Default to UTF-8, but force it in encrypt case.
*/
pkcs12_key_gen = PKCS12_key_gen_utf8;
else
pkcs12_key_gen = PKCS12_key_gen;
if (cipher == NULL)
return 0;
@ -43,14 +66,14 @@ int PKCS12_PBE_keyivgen(EVP_CIPHER_CTX *ctx, const char *pass, int passlen,
iter = ASN1_INTEGER_get(pbe->iter);
salt = pbe->salt->data;
saltlen = pbe->salt->length;
if (!PKCS12_key_gen(pass, passlen, salt, saltlen, PKCS12_KEY_ID,
iter, EVP_CIPHER_key_length(cipher), key, md)) {
if (!(*pkcs12_key_gen)(pass, passlen, salt, saltlen, PKCS12_KEY_ID,
iter, EVP_CIPHER_key_length(cipher), key, md)) {
PKCS12err(PKCS12_F_PKCS12_PBE_KEYIVGEN, PKCS12_R_KEY_GEN_ERROR);
PBEPARAM_free(pbe);
return 0;
}
if (!PKCS12_key_gen(pass, passlen, salt, saltlen, PKCS12_IV_ID,
iter, EVP_CIPHER_iv_length(cipher), iv, md)) {
if (!(*pkcs12_key_gen)(pass, passlen, salt, saltlen, PKCS12_IV_ID,
iter, EVP_CIPHER_iv_length(cipher), iv, md)) {
PKCS12err(PKCS12_F_PKCS12_PBE_KEYIVGEN, PKCS12_R_IV_GEN_ERROR);
PBEPARAM_free(pbe);
return 0;

9
crypto/pkcs12/p12_lcl.h
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@ -42,3 +42,12 @@ struct pkcs12_bag_st {
} value;
};
#undef PKCS12_key_gen
/*
* See p12_multi.c:PKCS12_verify_mac() for details...
*/
extern int (*PKCS12_key_gen)(const char *pass, int passlen,
unsigned char *salt, int slen,
int id, int iter, int n,
unsigned char *out,
const EVP_MD *md_type);

84
crypto/pkcs12/p12_mutl.c
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@ -66,9 +66,40 @@ static int pkcs12_gen_gost_mac_key(const char *pass, int passlen,
return 1;
}
#undef PKCS12_key_gen
/*
* |PKCS12_key_gen| is used to convey information about old-style broken
* password being used to PKCS12_PBE_keyivgen in decrypt cases. Workflow
* is if PKCS12_verify_mac notes that password encoded with compliant
* PKCS12_key_gen_utf8 conversion subroutine isn't right, while encoded
* with legacy non-compliant one is, then it sets |PKCS12_key_gen| to
* legacy PKCS12_key_gen_asc conversion subroutine, which is then picked
* by PKCS12_PBE_keyivgen. This applies to reading data. Written data
* on the other hand is protected with standard-compliant encoding, i.e.
* in backward-incompatible manner. Note that formally the approach is
* not MT-safe. Rationale is that in order to access PKCS#12 files from
* MT or even production application, you would be required to convert
* data to correct interoperable format. In which case this variable
* won't have to change. Conversion would have to be done with pkcs12
* utility, which is not MT, and hence can tolerate it. In other words
* goal is not to make this heuristic approach work in general case,
* but in one specific one, apps/pkcs12.c.
*/
int (*PKCS12_key_gen)(const char *pass, int passlen,
unsigned char *salt, int slen,
int id, int iter, int n,
unsigned char *out,
const EVP_MD *md_type) = NULL;
/* Generate a MAC */
int PKCS12_gen_mac(PKCS12 *p12, const char *pass, int passlen,
unsigned char *mac, unsigned int *maclen)
static int pkcs12_gen_mac(PKCS12 *p12, const char *pass, int passlen,
unsigned char *mac, unsigned int *maclen,
int (*pkcs12_key_gen)(const char *pass, int passlen,
unsigned char *salt, int slen,
int id, int iter, int n,
unsigned char *out,
const EVP_MD *md_type))
{
const EVP_MD *md_type;
HMAC_CTX *hmac = NULL;
@ -79,6 +110,11 @@ int PKCS12_gen_mac(PKCS12 *p12, const char *pass, int passlen,
const X509_ALGOR *macalg;
const ASN1_OBJECT *macoid;
if (pkcs12_key_gen == NULL)
pkcs12_key_gen = PKCS12_key_gen;
if (pkcs12_key_gen == NULL)
pkcs12_key_gen = PKCS12_key_gen_utf8;
if (!PKCS7_type_is_data(p12->authsafes)) {
PKCS12err(PKCS12_F_PKCS12_GEN_MAC, PKCS12_R_CONTENT_TYPE_NOT_DATA);
return 0;
@ -111,8 +147,8 @@ int PKCS12_gen_mac(PKCS12 *p12, const char *pass, int passlen,
return 0;
}
} else
if (!PKCS12_key_gen(pass, passlen, salt, saltlen, PKCS12_MAC_ID, iter,
md_size, key, md_type)) {
if (!(*pkcs12_key_gen)(pass, passlen, salt, saltlen, PKCS12_MAC_ID,
iter, md_size, key, md_type)) {
PKCS12err(PKCS12_F_PKCS12_GEN_MAC, PKCS12_R_KEY_GEN_ERROR);
return 0;
}
@ -128,6 +164,12 @@ int PKCS12_gen_mac(PKCS12 *p12, const char *pass, int passlen,
return 1;
}
int PKCS12_gen_mac(PKCS12 *p12, const char *pass, int passlen,
unsigned char *mac, unsigned int *maclen)
{
return pkcs12_gen_mac(p12, pass, passlen, mac, maclen, NULL);
}
/* Verify the mac */
int PKCS12_verify_mac(PKCS12 *p12, const char *pass, int passlen)
{
@ -139,14 +181,36 @@ int PKCS12_verify_mac(PKCS12 *p12, const char *pass, int passlen)
PKCS12err(PKCS12_F_PKCS12_VERIFY_MAC, PKCS12_R_MAC_ABSENT);
return 0;
}
if (!PKCS12_gen_mac(p12, pass, passlen, mac, &maclen)) {
if (!pkcs12_gen_mac(p12, pass, passlen, mac, &maclen,
PKCS12_key_gen_utf8)) {
PKCS12err(PKCS12_F_PKCS12_VERIFY_MAC, PKCS12_R_MAC_GENERATION_ERROR);
return 0;
}
X509_SIG_get0(p12->mac->dinfo, NULL, &macoct);
if ((maclen != (unsigned int)ASN1_STRING_length(macoct))
|| CRYPTO_memcmp(mac, ASN1_STRING_get0_data(macoct), maclen))
if (maclen != (unsigned int)ASN1_STRING_length(macoct))
return 0;
if (CRYPTO_memcmp(mac, ASN1_STRING_get0_data(macoct), maclen) != 0) {
if (pass == NULL)
return 0;
/*
* In order to facilitate accessing old data retry with
* old-style broken password ...
*/
if (!pkcs12_gen_mac(p12, pass, passlen, mac, &maclen,
PKCS12_key_gen_asc)) {
PKCS12err(PKCS12_F_PKCS12_VERIFY_MAC, PKCS12_R_MAC_GENERATION_ERROR);
return 0;
}
if ((maclen != (unsigned int)ASN1_STRING_length(macoct))
|| CRYPTO_memcmp(mac, ASN1_STRING_get0_data(macoct), maclen) != 0)
return 0;
else
PKCS12_key_gen = PKCS12_key_gen_asc;
/*
* ... and if suceeded, pass it on to PKCS12_PBE_keyivgen.
*/
}
return 1;
}
@ -166,7 +230,11 @@ int PKCS12_set_mac(PKCS12 *p12, const char *pass, int passlen,
PKCS12err(PKCS12_F_PKCS12_SET_MAC, PKCS12_R_MAC_SETUP_ERROR);
return 0;
}
if (!PKCS12_gen_mac(p12, pass, passlen, mac, &maclen)) {
/*
* Note that output mac is forced to UTF-8...
*/
if (!pkcs12_gen_mac(p12, pass, passlen, mac, &maclen,
PKCS12_key_gen_utf8)) {
PKCS12err(PKCS12_F_PKCS12_SET_MAC, PKCS12_R_MAC_GENERATION_ERROR);
return 0;
}

9
crypto/pkcs12/p12_utl.c
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@ -173,11 +173,16 @@ char *OPENSSL_uni2utf8(const unsigned char *uni, int unilen)
int asclen, i, j;
char *asctmp;
/* string must contain an even number of bytes */
if (unilen & 1)
return NULL;
for (asclen = 0, i = 0; i < unilen; ) {
j = bmp_to_utf8(NULL, uni+i, unilen-i);
/*
* falling back to OPENSSL_uni2asc makes lesser sense, it's
* done rather to maintain symmetry...
* falling back to OPENSSL_uni2asc makes lesser sense [than
* falling back to OPENSSL_asc2uni in OPENSSL_utf82uni above],
* it's done rather to maintain symmetry...
*/
if (j < 0) return OPENSSL_uni2asc(uni, unilen);
if (j == 4) i += 4;

10
doc/apps/pkcs12.pod
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@ -325,6 +325,16 @@ encrypted private keys, then the option B<-keypbe PBE-SHA1-RC2-40> can
be used to reduce the private key encryption to 40 bit RC2. A complete
description of all algorithms is contained in the B<pkcs8> manual page.
Prior 1.1 release passwords containing non-ASCII characters were encoded
in non-compliant manner, which limited interoperability, in first hand
with Windows. But switching to standard-compliant password encoding
poses problem accessing old data protected with broken encoding. For
this reason even legacy encodings is attempted when reading the
data. If you use PKCS#12 files in production application you are advised
to convert the data, because implemented heuristic approach is not
MT-safe, its sole goal is to facilitate the data upgrade with this
utility.
=head1 EXAMPLES
Parse a PKCS#12 file and output it to a file:

16
include/openssl/pkcs12.h
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@ -30,19 +30,9 @@ extern "C" {
# define PKCS12_SALT_LEN 8
/* Uncomment out next line for unicode password and names, otherwise ASCII */
/*
* #define PBE_UNICODE
*/
# ifdef PBE_UNICODE
# define PKCS12_key_gen PKCS12_key_gen_uni
# define PKCS12_add_friendlyname PKCS12_add_friendlyname_uni
# else
# define PKCS12_key_gen PKCS12_key_gen_utf8
# define PKCS12_add_friendlyname PKCS12_add_friendlyname_utf8
# endif
/* It's not clear if these are actually needed... */
# define PKCS12_key_gen PKCS12_key_gen_utf8
# define PKCS12_add_friendlyname PKCS12_add_friendlyname_utf8
/* MS key usage constants */

11
test/recipes/80-test_pkcs12.t
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@ -20,6 +20,17 @@ if (eval { require Win32::Console; 1; }) {
$savedcp = Win32::Console::OutputCP();
Win32::Console::OutputCP(1253);
$pass = Encode::encode("cp1253",Encode::decode("utf-8",$pass));
} else {
# Running MinGW tests transparenly under Wine apparently requires
# UTF-8 locale...
foreach(`locale -a`) {
s/\R$//;
if ($_ =~ m/^C\.UTF\-?8/i) {
$ENV{LC_ALL} = $_;
last;
}
}
}
# just see that we can read shibboleth.pfx protected with $pass