OpenSSL: address CVE-2020-1971

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

crypto/openssl/crypto/asn1/asn1_err.c

@@ -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"},

crypto/openssl/crypto/asn1/tasn_dec.c

@@ -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) {

crypto/openssl/crypto/asn1/tasn_enc.c

@@ -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);

crypto/openssl/crypto/err/openssl.txt

@@ -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

crypto/openssl/crypto/x509v3/v3_genn.c

@@ -22,8 +22,9 @@ ASN1_SEQUENCE(OTHERNAME) = {
 IMPLEMENT_ASN1_FUNCTIONS(OTHERNAME)
 
 ASN1_SEQUENCE(EDIPARTYNAME) = {
-        ASN1_IMP_OPT(EDIPARTYNAME, nameAssigner, DIRECTORYSTRING, 0),
+        /* DirectoryString is a CHOICE type so use explicit tagging */
-        ASN1_IMP_OPT(EDIPARTYNAME, partyName, DIRECTORYSTRING, 1)
+        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;

crypto/openssl/include/openssl/asn1err.h

@@ -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>
-#  include <openssl/symhacks.h>
-# endif
 
 # 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