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OpenSSL: address CVE-2020-1971

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OpenSSL commit 3db2c9f3:
Complain if we are attempting to encode with an invalid ASN.1 template

OpenSSL commit 43a7033:
Check that multi-strings/CHOICE types don't use implicit tagging

OpenSSL commit f960d812:
Correctly compare EdiPartyName in GENERAL_NAME_cmp()

Obtained from:	OpenSSL 3db2c9f3, 43a7033, f960d812
Security:	CVE-2020-1971
This commit is contained in:
Ed Maste 2020-12-08 16:43:35 +00:00
parent 87bf9b9cbe
commit 2c9ac5855b
6 changed files with 89 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
crypto/openssl/crypto/asn1/asn1_err.c
View File

@ -1,6 +1,6 @@
/*
* Generated by util/mkerr.pl DO NOT EDIT
* Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved.
* Copyright 1995-2020 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the OpenSSL license (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
@ -49,6 +49,7 @@ static const ERR_STRING_DATA ASN1_str_functs[] = {
"asn1_item_embed_d2i"},
{ERR_PACK(ERR_LIB_ASN1, ASN1_F_ASN1_ITEM_EMBED_NEW, 0),
"asn1_item_embed_new"},
{ERR_PACK(ERR_LIB_ASN1, ASN1_F_ASN1_ITEM_EX_I2D, 0), "ASN1_item_ex_i2d"},
{ERR_PACK(ERR_LIB_ASN1, ASN1_F_ASN1_ITEM_FLAGS_I2D, 0),
"asn1_item_flags_i2d"},
{ERR_PACK(ERR_LIB_ASN1, ASN1_F_ASN1_ITEM_I2D_BIO, 0), "ASN1_item_i2d_bio"},
@ -160,6 +161,7 @@ static const ERR_STRING_DATA ASN1_str_reasons[] = {
"asn1 sig parse error"},
{ERR_PACK(ERR_LIB_ASN1, 0, ASN1_R_AUX_ERROR), "aux error"},
{ERR_PACK(ERR_LIB_ASN1, 0, ASN1_R_BAD_OBJECT_HEADER), "bad object header"},
{ERR_PACK(ERR_LIB_ASN1, 0, ASN1_R_BAD_TEMPLATE), "bad template"},
{ERR_PACK(ERR_LIB_ASN1, 0, ASN1_R_BMPSTRING_IS_WRONG_LENGTH),
"bmpstring is wrong length"},
{ERR_PACK(ERR_LIB_ASN1, 0, ASN1_R_BN_LIB), "bn lib"},

19
crypto/openssl/crypto/asn1/tasn_dec.c
View File

@ -182,6 +182,15 @@ static int asn1_item_embed_d2i(ASN1_VALUE **pval, const unsigned char **in,
tag, aclass, opt, ctx);
case ASN1_ITYPE_MSTRING:
/*
* It never makes sense for multi-strings to have implicit tagging, so
* if tag != -1, then this looks like an error in the template.
*/
if (tag != -1) {
ASN1err(ASN1_F_ASN1_ITEM_EMBED_D2I, ASN1_R_BAD_TEMPLATE);
goto err;
}
p = *in;
/* Just read in tag and class */
ret = asn1_check_tlen(NULL, &otag, &oclass, NULL, NULL,
@ -199,6 +208,7 @@ static int asn1_item_embed_d2i(ASN1_VALUE **pval, const unsigned char **in,
ASN1err(ASN1_F_ASN1_ITEM_EMBED_D2I, ASN1_R_MSTRING_NOT_UNIVERSAL);
goto err;
}
/* Check tag matches bit map */
if (!(ASN1_tag2bit(otag) & it->utype)) {
/* If OPTIONAL, assume this is OK */
@ -215,6 +225,15 @@ static int asn1_item_embed_d2i(ASN1_VALUE **pval, const unsigned char **in,
return ef->asn1_ex_d2i(pval, in, len, it, tag, aclass, opt, ctx);
case ASN1_ITYPE_CHOICE:
/*
* It never makes sense for CHOICE types to have implicit tagging, so
* if tag != -1, then this looks like an error in the template.
*/
if (tag != -1) {
ASN1err(ASN1_F_ASN1_ITEM_EMBED_D2I, ASN1_R_BAD_TEMPLATE);
goto err;
}
if (asn1_cb && !asn1_cb(ASN1_OP_D2I_PRE, pval, it, NULL))
goto auxerr;
if (*pval) {

16
crypto/openssl/crypto/asn1/tasn_enc.c
View File

@ -103,9 +103,25 @@ int ASN1_item_ex_i2d(ASN1_VALUE **pval, unsigned char **out,
return asn1_i2d_ex_primitive(pval, out, it, tag, aclass);
case ASN1_ITYPE_MSTRING:
/*
* It never makes sense for multi-strings to have implicit tagging, so
* if tag != -1, then this looks like an error in the template.
*/
if (tag != -1) {
ASN1err(ASN1_F_ASN1_ITEM_EX_I2D, ASN1_R_BAD_TEMPLATE);
return -1;
}
return asn1_i2d_ex_primitive(pval, out, it, -1, aclass);
case ASN1_ITYPE_CHOICE:
/*
* It never makes sense for CHOICE types to have implicit tagging, so
* if tag != -1, then this looks like an error in the template.
*/
if (tag != -1) {
ASN1err(ASN1_F_ASN1_ITEM_EX_I2D, ASN1_R_BAD_TEMPLATE);
return -1;
}
if (asn1_cb && !asn1_cb(ASN1_OP_I2D_PRE, pval, it, NULL))
return 0;
i = asn1_get_choice_selector(pval, it);

2
crypto/openssl/crypto/err/openssl.txt
View File

@ -36,6 +36,7 @@ ASN1_F_ASN1_ITEM_D2I_FP:206:ASN1_item_d2i_fp
ASN1_F_ASN1_ITEM_DUP:191:ASN1_item_dup
ASN1_F_ASN1_ITEM_EMBED_D2I:120:asn1_item_embed_d2i
ASN1_F_ASN1_ITEM_EMBED_NEW:121:asn1_item_embed_new
ASN1_F_ASN1_ITEM_EX_I2D:144:ASN1_item_ex_i2d
ASN1_F_ASN1_ITEM_FLAGS_I2D:118:asn1_item_flags_i2d
ASN1_F_ASN1_ITEM_I2D_BIO:192:ASN1_item_i2d_bio
ASN1_F_ASN1_ITEM_I2D_FP:193:ASN1_item_i2d_fp
@ -1771,6 +1772,7 @@ ASN1_R_ASN1_PARSE_ERROR:203:asn1 parse error
ASN1_R_ASN1_SIG_PARSE_ERROR:204:asn1 sig parse error
ASN1_R_AUX_ERROR:100:aux error
ASN1_R_BAD_OBJECT_HEADER:102:bad object header
ASN1_R_BAD_TEMPLATE:230:bad template
ASN1_R_BMPSTRING_IS_WRONG_LENGTH:214:bmpstring is wrong length
ASN1_R_BN_LIB:105:bn lib
ASN1_R_BOOLEAN_IS_WRONG_LENGTH:106:boolean is wrong length

50
crypto/openssl/crypto/x509v3/v3_genn.c
View File

@ -22,8 +22,9 @@ ASN1_SEQUENCE(OTHERNAME) = {
IMPLEMENT_ASN1_FUNCTIONS(OTHERNAME)
ASN1_SEQUENCE(EDIPARTYNAME) = {
ASN1_IMP_OPT(EDIPARTYNAME, nameAssigner, DIRECTORYSTRING, 0),
ASN1_IMP_OPT(EDIPARTYNAME, partyName, DIRECTORYSTRING, 1)
/* DirectoryString is a CHOICE type so use explicit tagging */
ASN1_EXP_OPT(EDIPARTYNAME, nameAssigner, DIRECTORYSTRING, 0),
ASN1_EXP(EDIPARTYNAME, partyName, DIRECTORYSTRING, 1)
} ASN1_SEQUENCE_END(EDIPARTYNAME)
IMPLEMENT_ASN1_FUNCTIONS(EDIPARTYNAME)
@ -57,6 +58,37 @@ GENERAL_NAME *GENERAL_NAME_dup(GENERAL_NAME *a)
(char *)a);
}
static int edipartyname_cmp(const EDIPARTYNAME *a, const EDIPARTYNAME *b)
{
int res;
if (a == NULL || b == NULL) {
/*
* Shouldn't be possible in a valid GENERAL_NAME, but we handle it
* anyway. OTHERNAME_cmp treats NULL != NULL so we do the same here
*/
return -1;
}
if (a->nameAssigner == NULL && b->nameAssigner != NULL)
return -1;
if (a->nameAssigner != NULL && b->nameAssigner == NULL)
return 1;
/* If we get here then both have nameAssigner set, or both unset */
if (a->nameAssigner != NULL) {
res = ASN1_STRING_cmp(a->nameAssigner, b->nameAssigner);
if (res != 0)
return res;
}
/*
* partyName is required, so these should never be NULL. We treat it in
* the same way as the a == NULL || b == NULL case above
*/
if (a->partyName == NULL || b->partyName == NULL)
return -1;
return ASN1_STRING_cmp(a->partyName, b->partyName);
}
/* Returns 0 if they are equal, != 0 otherwise. */
int GENERAL_NAME_cmp(GENERAL_NAME *a, GENERAL_NAME *b)
{
@ -66,8 +98,11 @@ int GENERAL_NAME_cmp(GENERAL_NAME *a, GENERAL_NAME *b)
return -1;
switch (a->type) {
case GEN_X400:
result = ASN1_TYPE_cmp(a->d.x400Address, b->d.x400Address);
break;
case GEN_EDIPARTY:
result = ASN1_TYPE_cmp(a->d.other, b->d.other);
result = edipartyname_cmp(a->d.ediPartyName, b->d.ediPartyName);
break;
case GEN_OTHERNAME:
@ -114,8 +149,11 @@ void GENERAL_NAME_set0_value(GENERAL_NAME *a, int type, void *value)
{
switch (type) {
case GEN_X400:
a->d.x400Address = value;
break;
case GEN_EDIPARTY:
a->d.other = value;
a->d.ediPartyName = value;
break;
case GEN_OTHERNAME:
@ -149,8 +187,10 @@ void *GENERAL_NAME_get0_value(const GENERAL_NAME *a, int *ptype)
*ptype = a->type;
switch (a->type) {
case GEN_X400:
return a->d.x400Address;
case GEN_EDIPARTY:
return a->d.other;
return a->d.ediPartyName;
case GEN_OTHERNAME:
return a->d.otherName;

8
crypto/openssl/include/openssl/asn1err.h
View File

@ -1,6 +1,6 @@
/*
* Generated by util/mkerr.pl DO NOT EDIT
* Copyright 1995-2019 The OpenSSL Project Authors. All Rights Reserved.
* Copyright 1995-2020 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the OpenSSL license (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
@ -11,9 +11,7 @@
#ifndef HEADER_ASN1ERR_H
# define HEADER_ASN1ERR_H
# ifndef HEADER_SYMHACKS_H
# include <openssl/symhacks.h>
# endif
# include <openssl/symhacks.h>
# ifdef __cplusplus
extern "C"
@ -53,6 +51,7 @@ int ERR_load_ASN1_strings(void);
# define ASN1_F_ASN1_ITEM_DUP 191
# define ASN1_F_ASN1_ITEM_EMBED_D2I 120
# define ASN1_F_ASN1_ITEM_EMBED_NEW 121
# define ASN1_F_ASN1_ITEM_EX_I2D 144
# define ASN1_F_ASN1_ITEM_FLAGS_I2D 118
# define ASN1_F_ASN1_ITEM_I2D_BIO 192
# define ASN1_F_ASN1_ITEM_I2D_FP 193
@ -145,6 +144,7 @@ int ERR_load_ASN1_strings(void);
# define ASN1_R_ASN1_SIG_PARSE_ERROR 204
# define ASN1_R_AUX_ERROR 100
# define ASN1_R_BAD_OBJECT_HEADER 102
# define ASN1_R_BAD_TEMPLATE 230
# define ASN1_R_BMPSTRING_IS_WRONG_LENGTH 214
# define ASN1_R_BN_LIB 105
# define ASN1_R_BOOLEAN_IS_WRONG_LENGTH 106