Fix OpenSSL NULL pointer de-reference.

Approved by:	so
Security:	FreeBSD-SA-20:33.openssl
Security:	CVE-2020-1971

Author: tetlowgm

UPDATING

@@ -16,6 +16,10 @@ from older versions of FreeBSD, try WITHOUT_CLANG and WITH_GCC to bootstrap to
 the tip of head, and then rebuild without this option. The bootstrap process
 from older version of current across the gcc/clang cutover is a bit fragile.
 
+20201215:	p6	FreeBSD-SA-20:33.openssl
+
+        Fix OpenSSL NULL pointer de-reference. [SA-20:33.openssl]
+
 20201201:	p5	FreeBSD-EN-20:19.audit
 			FreeBSD-EN-20:20.tzdata
 			FreeBSD-EN-20:22.callout

crypto/openssl/crypto/asn1/asn1.h

@@ -1203,6 +1203,7 @@ void ERR_load_ASN1_strings(void);
 # define ASN1_F_ASN1_ITEM_DUP                             191
 # define ASN1_F_ASN1_ITEM_EX_COMBINE_NEW                  121
 # define ASN1_F_ASN1_ITEM_EX_D2I                          120
+# define ASN1_F_ASN1_ITEM_EX_I2D                          224
 # define ASN1_F_ASN1_ITEM_I2D_BIO                         192
 # define ASN1_F_ASN1_ITEM_I2D_FP                          193
 # define ASN1_F_ASN1_ITEM_PACK                            198
@@ -1304,6 +1305,7 @@ void ERR_load_ASN1_strings(void);
 # define ASN1_R_BAD_OBJECT_HEADER                         102
 # define ASN1_R_BAD_PASSWORD_READ                         103
 # define ASN1_R_BAD_TAG                                   104
+# define ASN1_R_BAD_TEMPLATE                              221
 # define ASN1_R_BMPSTRING_IS_WRONG_LENGTH                 214
 # define ASN1_R_BN_LIB                                    105
 # define ASN1_R_BOOLEAN_IS_WRONG_LENGTH                   106

crypto/openssl/crypto/asn1/asn1_err.c

@@ -1,6 +1,6 @@
 /* crypto/asn1/asn1_err.c */
 /* ====================================================================
- * Copyright (c) 1999-2018 The OpenSSL Project.  All rights reserved.
+ * Copyright (c) 1999-2020 The OpenSSL Project.  All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -103,6 +103,7 @@ static ERR_STRING_DATA ASN1_str_functs[] = {
     {ERR_FUNC(ASN1_F_ASN1_ITEM_DUP), "ASN1_item_dup"},
     {ERR_FUNC(ASN1_F_ASN1_ITEM_EX_COMBINE_NEW), "ASN1_ITEM_EX_COMBINE_NEW"},
     {ERR_FUNC(ASN1_F_ASN1_ITEM_EX_D2I), "ASN1_ITEM_EX_D2I"},
+    {ERR_FUNC(ASN1_F_ASN1_ITEM_EX_I2D), "ASN1_item_ex_i2d"},
     {ERR_FUNC(ASN1_F_ASN1_ITEM_I2D_BIO), "ASN1_item_i2d_bio"},
     {ERR_FUNC(ASN1_F_ASN1_ITEM_I2D_FP), "ASN1_item_i2d_fp"},
     {ERR_FUNC(ASN1_F_ASN1_ITEM_PACK), "ASN1_item_pack"},
@@ -207,6 +208,7 @@ static ERR_STRING_DATA ASN1_str_reasons[] = {
     {ERR_REASON(ASN1_R_BAD_OBJECT_HEADER), "bad object header"},
     {ERR_REASON(ASN1_R_BAD_PASSWORD_READ), "bad password read"},
     {ERR_REASON(ASN1_R_BAD_TAG), "bad tag"},
+    {ERR_REASON(ASN1_R_BAD_TEMPLATE), "bad template"},
     {ERR_REASON(ASN1_R_BMPSTRING_IS_WRONG_LENGTH),
      "bmpstring is wrong length"},
     {ERR_REASON(ASN1_R_BN_LIB), "bn lib"},

crypto/openssl/crypto/asn1/tasn_dec.c

@@ -223,6 +223,15 @@ static int asn1_item_ex_d2i(ASN1_VALUE **pval, const unsigned char **in,
         break;
 
     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_D2I, ASN1_R_BAD_TEMPLATE);
+            goto err;
+        }
+
         p = *in;
         /* Just read in tag and class */
         ret = asn1_check_tlen(NULL, &otag, &oclass, NULL, NULL,
@@ -240,6 +249,7 @@ static int asn1_item_ex_d2i(ASN1_VALUE **pval, const unsigned char **in,
             ASN1err(ASN1_F_ASN1_ITEM_EX_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 */
@@ -316,6 +326,15 @@ static int asn1_item_ex_d2i(ASN1_VALUE **pval, const unsigned char **in,
         goto err;
 
     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_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

@@ -151,9 +151,25 @@ int ASN1_item_ex_i2d(ASN1_VALUE **pval, unsigned char **out,
         break;
 
     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/x509v3/v3_genn.c

@@ -72,8 +72,9 @@ 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)
@@ -107,6 +108,37 @@ 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)
 {
@@ -116,8 +148,11 @@ 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:
@@ -164,8 +199,11 @@ 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:
@@ -199,8 +237,10 @@ void *GENERAL_NAME_get0_value(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;

sys/conf/newvers.sh

@@ -44,7 +44,7 @@
 
 TYPE="FreeBSD"
 REVISION="11.4"
-BRANCH="RELEASE-p5"
+BRANCH="RELEASE-p6"
 if [ -n "${BRANCH_OVERRIDE}" ]; then
 	BRANCH=${BRANCH_OVERRIDE}
 fi