initial/final commitHEADmaster

1 files changed, 1238 insertions, 0 deletions

diff --git a/openssl-1.1.0h/crypto/x509v3/v3_utl.c b/openssl-1.1.0h/crypto/x509v3/v3_utl.c
new file mode 100644
index 0000000..418ef06
--- /dev/null
+++ b/openssl-1.1.0h/crypto/x509v3/v3_utl.c
@@ -0,0 +1,1238 @@
+/*
+ * Copyright 1999-2016 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
+ * in the file LICENSE in the source distribution or at
+ * https://www.openssl.org/source/license.html
+ */
+
+/* X509 v3 extension utilities */
+
+#include <stdio.h>
+#include <ctype.h>
+#include "internal/cryptlib.h"
+#include <openssl/conf.h>
+#include <openssl/crypto.h>
+#include <openssl/x509v3.h>
+#include "internal/x509_int.h"
+#include <openssl/bn.h>
+#include "ext_dat.h"
+
+static char *strip_spaces(char *name);
+static int sk_strcmp(const char *const *a, const char *const *b);
+static STACK_OF(OPENSSL_STRING) *get_email(X509_NAME *name,
+                                           GENERAL_NAMES *gens);
+static void str_free(OPENSSL_STRING str);
+static int append_ia5(STACK_OF(OPENSSL_STRING) **sk, const ASN1_IA5STRING *email);
+
+static int ipv4_from_asc(unsigned char *v4, const char *in);
+static int ipv6_from_asc(unsigned char *v6, const char *in);
+static int ipv6_cb(const char *elem, int len, void *usr);
+static int ipv6_hex(unsigned char *out, const char *in, int inlen);
+
+/* Add a CONF_VALUE name value pair to stack */
+
+int X509V3_add_value(const char *name, const char *value,
+                     STACK_OF(CONF_VALUE) **extlist)
+{
+    CONF_VALUE *vtmp = NULL;
+    char *tname = NULL, *tvalue = NULL;
+    int sk_allocated = (*extlist == NULL);
+
+    if (name && (tname = OPENSSL_strdup(name)) == NULL)
+        goto err;
+    if (value && (tvalue = OPENSSL_strdup(value)) == NULL)
+        goto err;
+    if ((vtmp = OPENSSL_malloc(sizeof(*vtmp))) == NULL)
+        goto err;
+    if (sk_allocated && (*extlist = sk_CONF_VALUE_new_null()) == NULL)
+        goto err;
+    vtmp->section = NULL;
+    vtmp->name = tname;
+    vtmp->value = tvalue;
+    if (!sk_CONF_VALUE_push(*extlist, vtmp))
+        goto err;
+    return 1;
+ err:
+    X509V3err(X509V3_F_X509V3_ADD_VALUE, ERR_R_MALLOC_FAILURE);
+    if (sk_allocated) {
+        sk_CONF_VALUE_free(*extlist);
+        *extlist = NULL;
+    }
+    OPENSSL_free(vtmp);
+    OPENSSL_free(tname);
+    OPENSSL_free(tvalue);
+    return 0;
+}
+
+int X509V3_add_value_uchar(const char *name, const unsigned char *value,
+                           STACK_OF(CONF_VALUE) **extlist)
+{
+    return X509V3_add_value(name, (const char *)value, extlist);
+}
+
+/* Free function for STACK_OF(CONF_VALUE) */
+
+void X509V3_conf_free(CONF_VALUE *conf)
+{
+    if (!conf)
+        return;
+    OPENSSL_free(conf->name);
+    OPENSSL_free(conf->value);
+    OPENSSL_free(conf->section);
+    OPENSSL_free(conf);
+}
+
+int X509V3_add_value_bool(const char *name, int asn1_bool,
+                          STACK_OF(CONF_VALUE) **extlist)
+{
+    if (asn1_bool)
+        return X509V3_add_value(name, "TRUE", extlist);
+    return X509V3_add_value(name, "FALSE", extlist);
+}
+
+int X509V3_add_value_bool_nf(const char *name, int asn1_bool,
+                             STACK_OF(CONF_VALUE) **extlist)
+{
+    if (asn1_bool)
+        return X509V3_add_value(name, "TRUE", extlist);
+    return 1;
+}
+
+static char *bignum_to_string(const BIGNUM *bn)
+{
+    char *tmp, *ret;
+    size_t len;
+
+    /*
+     * Display large numbers in hex and small numbers in decimal. Converting to
+     * decimal takes quadratic time and is no more useful than hex for large
+     * numbers.
+     */
+    if (BN_num_bits(bn) < 128)
+        return BN_bn2dec(bn);
+
+    tmp = BN_bn2hex(bn);
+    if (tmp == NULL)
+        return NULL;
+
+    len = strlen(tmp) + 3;
+    ret = OPENSSL_malloc(len);
+    if (ret == NULL) {
+        X509V3err(X509V3_F_BIGNUM_TO_STRING, ERR_R_MALLOC_FAILURE);
+        OPENSSL_free(tmp);
+        return NULL;
+    }
+
+    /* Prepend "0x", but place it after the "-" if negative. */
+    if (tmp[0] == '-') {
+        OPENSSL_strlcpy(ret, "-0x", len);
+        OPENSSL_strlcat(ret, tmp + 1, len);
+    } else {
+        OPENSSL_strlcpy(ret, "0x", len);
+        OPENSSL_strlcat(ret, tmp, len);
+    }
+    OPENSSL_free(tmp);
+    return ret;
+}
+
+char *i2s_ASN1_ENUMERATED(X509V3_EXT_METHOD *method, const ASN1_ENUMERATED *a)
+{
+    BIGNUM *bntmp = NULL;
+    char *strtmp = NULL;
+
+    if (!a)
+        return NULL;
+    if ((bntmp = ASN1_ENUMERATED_to_BN(a, NULL)) == NULL
+        || (strtmp = bignum_to_string(bntmp)) == NULL)
+        X509V3err(X509V3_F_I2S_ASN1_ENUMERATED, ERR_R_MALLOC_FAILURE);
+    BN_free(bntmp);
+    return strtmp;
+}
+
+char *i2s_ASN1_INTEGER(X509V3_EXT_METHOD *method, const ASN1_INTEGER *a)
+{
+    BIGNUM *bntmp = NULL;
+    char *strtmp = NULL;
+
+    if (!a)
+        return NULL;
+    if ((bntmp = ASN1_INTEGER_to_BN(a, NULL)) == NULL
+        || (strtmp = bignum_to_string(bntmp)) == NULL)
+        X509V3err(X509V3_F_I2S_ASN1_INTEGER, ERR_R_MALLOC_FAILURE);
+    BN_free(bntmp);
+    return strtmp;
+}
+
+ASN1_INTEGER *s2i_ASN1_INTEGER(X509V3_EXT_METHOD *method, const char *value)
+{
+    BIGNUM *bn = NULL;
+    ASN1_INTEGER *aint;
+    int isneg, ishex;
+    int ret;
+    if (value == NULL) {
+        X509V3err(X509V3_F_S2I_ASN1_INTEGER, X509V3_R_INVALID_NULL_VALUE);
+        return NULL;
+    }
+    bn = BN_new();
+    if (bn == NULL) {
+        X509V3err(X509V3_F_S2I_ASN1_INTEGER, ERR_R_MALLOC_FAILURE);
+        return NULL;
+    }
+    if (value[0] == '-') {
+        value++;
+        isneg = 1;
+    } else
+        isneg = 0;
+
+    if (value[0] == '0' && ((value[1] == 'x') || (value[1] == 'X'))) {
+        value += 2;
+        ishex = 1;
+    } else
+        ishex = 0;
+
+    if (ishex)
+        ret = BN_hex2bn(&bn, value);
+    else
+        ret = BN_dec2bn(&bn, value);
+
+    if (!ret || value[ret]) {
+        BN_free(bn);
+        X509V3err(X509V3_F_S2I_ASN1_INTEGER, X509V3_R_BN_DEC2BN_ERROR);
+        return NULL;
+    }
+
+    if (isneg && BN_is_zero(bn))
+        isneg = 0;
+
+    aint = BN_to_ASN1_INTEGER(bn, NULL);
+    BN_free(bn);
+    if (!aint) {
+        X509V3err(X509V3_F_S2I_ASN1_INTEGER,
+                  X509V3_R_BN_TO_ASN1_INTEGER_ERROR);
+        return NULL;
+    }
+    if (isneg)
+        aint->type |= V_ASN1_NEG;
+    return aint;
+}
+
+int X509V3_add_value_int(const char *name, const ASN1_INTEGER *aint,
+                         STACK_OF(CONF_VALUE) **extlist)
+{
+    char *strtmp;
+    int ret;
+
+    if (!aint)
+        return 1;
+    if ((strtmp = i2s_ASN1_INTEGER(NULL, aint)) == NULL)
+        return 0;
+    ret = X509V3_add_value(name, strtmp, extlist);
+    OPENSSL_free(strtmp);
+    return ret;
+}
+
+int X509V3_get_value_bool(const CONF_VALUE *value, int *asn1_bool)
+{
+    const char *btmp;
+
+    if ((btmp = value->value) == NULL)
+        goto err;
+    if (strcmp(btmp, "TRUE") == 0
+        || strcmp(btmp, "true") == 0
+        || strcmp(btmp, "Y") == 0
+        || strcmp(btmp, "y") == 0
+        || strcmp(btmp, "YES") == 0
+        || strcmp(btmp, "yes") == 0) {
+        *asn1_bool = 0xff;
+        return 1;
+    }
+    if (strcmp(btmp, "FALSE") == 0
+        || strcmp(btmp, "false") == 0
+        || strcmp(btmp, "N") == 0
+        || strcmp(btmp, "n") == 0
+        || strcmp(btmp, "NO") == 0
+        || strcmp(btmp, "no") == 0) {
+        *asn1_bool = 0;
+        return 1;
+    }
+ err:
+    X509V3err(X509V3_F_X509V3_GET_VALUE_BOOL,
+              X509V3_R_INVALID_BOOLEAN_STRING);
+    X509V3_conf_err(value);
+    return 0;
+}
+
+int X509V3_get_value_int(const CONF_VALUE *value, ASN1_INTEGER **aint)
+{
+    ASN1_INTEGER *itmp;
+
+    if ((itmp = s2i_ASN1_INTEGER(NULL, value->value)) == NULL) {
+        X509V3_conf_err(value);
+        return 0;
+    }
+    *aint = itmp;
+    return 1;
+}
+
+#define HDR_NAME        1
+#define HDR_VALUE       2
+
+/*
+ * #define DEBUG
+ */
+
+STACK_OF(CONF_VALUE) *X509V3_parse_list(const char *line)
+{
+    char *p, *q, c;
+    char *ntmp, *vtmp;
+    STACK_OF(CONF_VALUE) *values = NULL;
+    char *linebuf;
+    int state;
+    /* We are going to modify the line so copy it first */
+    linebuf = OPENSSL_strdup(line);
+    if (linebuf == NULL) {
+        X509V3err(X509V3_F_X509V3_PARSE_LIST, ERR_R_MALLOC_FAILURE);
+        goto err;
+    }
+    state = HDR_NAME;
+    ntmp = NULL;
+    /* Go through all characters */
+    for (p = linebuf, q = linebuf; (c = *p) && (c != '\r') && (c != '\n');
+         p++) {
+
+        switch (state) {
+        case HDR_NAME:
+            if (c == ':') {
+                state = HDR_VALUE;
+                *p = 0;
+                ntmp = strip_spaces(q);
+                if (!ntmp) {
+                    X509V3err(X509V3_F_X509V3_PARSE_LIST,
+                              X509V3_R_INVALID_NULL_NAME);
+                    goto err;
+                }
+                q = p + 1;
+            } else if (c == ',') {
+                *p = 0;
+                ntmp = strip_spaces(q);
+                q = p + 1;
+                if (!ntmp) {
+                    X509V3err(X509V3_F_X509V3_PARSE_LIST,
+                              X509V3_R_INVALID_NULL_NAME);
+                    goto err;
+                }
+                X509V3_add_value(ntmp, NULL, &values);
+            }
+            break;
+
+        case HDR_VALUE:
+            if (c == ',') {
+                state = HDR_NAME;
+                *p = 0;
+                vtmp = strip_spaces(q);
+                if (!vtmp) {
+                    X509V3err(X509V3_F_X509V3_PARSE_LIST,
+                              X509V3_R_INVALID_NULL_VALUE);
+                    goto err;
+                }
+                X509V3_add_value(ntmp, vtmp, &values);
+                ntmp = NULL;
+                q = p + 1;
+            }
+
+        }
+    }
+
+    if (state == HDR_VALUE) {
+        vtmp = strip_spaces(q);
+        if (!vtmp) {
+            X509V3err(X509V3_F_X509V3_PARSE_LIST,
+                      X509V3_R_INVALID_NULL_VALUE);
+            goto err;
+        }
+        X509V3_add_value(ntmp, vtmp, &values);
+    } else {
+        ntmp = strip_spaces(q);
+        if (!ntmp) {
+            X509V3err(X509V3_F_X509V3_PARSE_LIST, X509V3_R_INVALID_NULL_NAME);
+            goto err;
+        }
+        X509V3_add_value(ntmp, NULL, &values);
+    }
+    OPENSSL_free(linebuf);
+    return values;
+
+ err:
+    OPENSSL_free(linebuf);
+    sk_CONF_VALUE_pop_free(values, X509V3_conf_free);
+    return NULL;
+
+}
+
+/* Delete leading and trailing spaces from a string */
+static char *strip_spaces(char *name)
+{
+    char *p, *q;
+    /* Skip over leading spaces */
+    p = name;
+    while (*p && isspace((unsigned char)*p))
+        p++;
+    if (!*p)
+        return NULL;
+    q = p + strlen(p) - 1;
+    while ((q != p) && isspace((unsigned char)*q))
+        q--;
+    if (p != q)
+        q[1] = 0;
+    if (!*p)
+        return NULL;
+    return p;
+}
+
+
+/*
+ * V2I name comparison function: returns zero if 'name' matches cmp or cmp.*
+ */
+
+int name_cmp(const char *name, const char *cmp)
+{
+    int len, ret;
+    char c;
+    len = strlen(cmp);
+    if ((ret = strncmp(name, cmp, len)))
+        return ret;
+    c = name[len];
+    if (!c || (c == '.'))
+        return 0;
+    return 1;
+}
+
+static int sk_strcmp(const char *const *a, const char *const *b)
+{
+    return strcmp(*a, *b);
+}
+
+STACK_OF(OPENSSL_STRING) *X509_get1_email(X509 *x)
+{
+    GENERAL_NAMES *gens;
+    STACK_OF(OPENSSL_STRING) *ret;
+
+    gens = X509_get_ext_d2i(x, NID_subject_alt_name, NULL, NULL);
+    ret = get_email(X509_get_subject_name(x), gens);
+    sk_GENERAL_NAME_pop_free(gens, GENERAL_NAME_free);
+    return ret;
+}
+
+STACK_OF(OPENSSL_STRING) *X509_get1_ocsp(X509 *x)
+{
+    AUTHORITY_INFO_ACCESS *info;
+    STACK_OF(OPENSSL_STRING) *ret = NULL;
+    int i;
+
+    info = X509_get_ext_d2i(x, NID_info_access, NULL, NULL);
+    if (!info)
+        return NULL;
+    for (i = 0; i < sk_ACCESS_DESCRIPTION_num(info); i++) {
+        ACCESS_DESCRIPTION *ad = sk_ACCESS_DESCRIPTION_value(info, i);
+        if (OBJ_obj2nid(ad->method) == NID_ad_OCSP) {
+            if (ad->location->type == GEN_URI) {
+                if (!append_ia5
+                    (&ret, ad->location->d.uniformResourceIdentifier))
+                    break;
+            }
+        }
+    }
+    AUTHORITY_INFO_ACCESS_free(info);
+    return ret;
+}
+
+STACK_OF(OPENSSL_STRING) *X509_REQ_get1_email(X509_REQ *x)
+{
+    GENERAL_NAMES *gens;
+    STACK_OF(X509_EXTENSION) *exts;
+    STACK_OF(OPENSSL_STRING) *ret;
+
+    exts = X509_REQ_get_extensions(x);
+    gens = X509V3_get_d2i(exts, NID_subject_alt_name, NULL, NULL);
+    ret = get_email(X509_REQ_get_subject_name(x), gens);
+    sk_GENERAL_NAME_pop_free(gens, GENERAL_NAME_free);
+    sk_X509_EXTENSION_pop_free(exts, X509_EXTENSION_free);
+    return ret;
+}
+
+static STACK_OF(OPENSSL_STRING) *get_email(X509_NAME *name,
+                                           GENERAL_NAMES *gens)
+{
+    STACK_OF(OPENSSL_STRING) *ret = NULL;
+    X509_NAME_ENTRY *ne;
+    ASN1_IA5STRING *email;
+    GENERAL_NAME *gen;
+    int i;
+    /* Now add any email address(es) to STACK */
+    i = -1;
+    /* First supplied X509_NAME */
+    while ((i = X509_NAME_get_index_by_NID(name,
+                                           NID_pkcs9_emailAddress, i)) >= 0) {
+        ne = X509_NAME_get_entry(name, i);
+        email = X509_NAME_ENTRY_get_data(ne);
+        if (!append_ia5(&ret, email))
+            return NULL;
+    }
+    for (i = 0; i < sk_GENERAL_NAME_num(gens); i++) {
+        gen = sk_GENERAL_NAME_value(gens, i);
+        if (gen->type != GEN_EMAIL)
+            continue;
+        if (!append_ia5(&ret, gen->d.ia5))
+            return NULL;
+    }
+    return ret;
+}
+
+static void str_free(OPENSSL_STRING str)
+{
+    OPENSSL_free(str);
+}
+
+static int append_ia5(STACK_OF(OPENSSL_STRING) **sk, const ASN1_IA5STRING *email)
+{
+    char *emtmp;
+    /* First some sanity checks */
+    if (email->type != V_ASN1_IA5STRING)
+        return 1;
+    if (!email->data || !email->length)
+        return 1;
+    if (*sk == NULL)
+        *sk = sk_OPENSSL_STRING_new(sk_strcmp);
+    if (*sk == NULL)
+        return 0;
+    /* Don't add duplicates */
+    if (sk_OPENSSL_STRING_find(*sk, (char *)email->data) != -1)
+        return 1;
+    emtmp = OPENSSL_strdup((char *)email->data);
+    if (emtmp == NULL || !sk_OPENSSL_STRING_push(*sk, emtmp)) {
+        OPENSSL_free(emtmp);    /* free on push failure */
+        X509_email_free(*sk);
+        *sk = NULL;
+        return 0;
+    }
+    return 1;
+}
+
+void X509_email_free(STACK_OF(OPENSSL_STRING) *sk)
+{
+    sk_OPENSSL_STRING_pop_free(sk, str_free);
+}
+
+typedef int (*equal_fn) (const unsigned char *pattern, size_t pattern_len,
+                         const unsigned char *subject, size_t subject_len,
+                         unsigned int flags);
+
+/* Skip pattern prefix to match "wildcard" subject */
+static void skip_prefix(const unsigned char **p, size_t *plen,
+                        size_t subject_len,
+                        unsigned int flags)
+{
+    const unsigned char *pattern = *p;
+    size_t pattern_len = *plen;
+
+    /*
+     * If subject starts with a leading '.' followed by more octets, and
+     * pattern is longer, compare just an equal-length suffix with the
+     * full subject (starting at the '.'), provided the prefix contains
+     * no NULs.
+     */
+    if ((flags & _X509_CHECK_FLAG_DOT_SUBDOMAINS) == 0)
+        return;
+
+    while (pattern_len > subject_len && *pattern) {
+        if ((flags & X509_CHECK_FLAG_SINGLE_LABEL_SUBDOMAINS) &&
+            *pattern == '.')
+            break;
+        ++pattern;
+        --pattern_len;
+    }
+
+    /* Skip if entire prefix acceptable */
+    if (pattern_len == subject_len) {
+        *p = pattern;
+        *plen = pattern_len;
+    }
+}
+
+/* Compare while ASCII ignoring case. */
+static int equal_nocase(const unsigned char *pattern, size_t pattern_len,
+                        const unsigned char *subject, size_t subject_len,
+                        unsigned int flags)
+{
+    skip_prefix(&pattern, &pattern_len, subject_len, flags);
+    if (pattern_len != subject_len)
+        return 0;
+    while (pattern_len) {
+        unsigned char l = *pattern;
+        unsigned char r = *subject;
+        /* The pattern must not contain NUL characters. */
+        if (l == 0)
+            return 0;
+        if (l != r) {
+            if ('A' <= l && l <= 'Z')
+                l = (l - 'A') + 'a';
+            if ('A' <= r && r <= 'Z')
+                r = (r - 'A') + 'a';
+            if (l != r)
+                return 0;
+        }
+        ++pattern;
+        ++subject;
+        --pattern_len;
+    }
+    return 1;
+}
+
+/* Compare using memcmp. */
+static int equal_case(const unsigned char *pattern, size_t pattern_len,
+                      const unsigned char *subject, size_t subject_len,
+                      unsigned int flags)
+{
+    skip_prefix(&pattern, &pattern_len, subject_len, flags);
+    if (pattern_len != subject_len)
+        return 0;
+    return !memcmp(pattern, subject, pattern_len);
+}
+
+/*
+ * RFC 5280, section 7.5, requires that only the domain is compared in a
+ * case-insensitive manner.
+ */
+static int equal_email(const unsigned char *a, size_t a_len,
+                       const unsigned char *b, size_t b_len,
+                       unsigned int unused_flags)
+{
+    size_t i = a_len;
+    if (a_len != b_len)
+        return 0;
+    /*
+     * We search backwards for the '@' character, so that we do not have to
+     * deal with quoted local-parts.  The domain part is compared in a
+     * case-insensitive manner.
+     */
+    while (i > 0) {
+        --i;
+        if (a[i] == '@' || b[i] == '@') {
+            if (!equal_nocase(a + i, a_len - i, b + i, a_len - i, 0))
+                return 0;
+            break;
+        }
+    }
+    if (i == 0)
+        i = a_len;
+    return equal_case(a, i, b, i, 0);
+}
+
+/*
+ * Compare the prefix and suffix with the subject, and check that the
+ * characters in-between are valid.
+ */
+static int wildcard_match(const unsigned char *prefix, size_t prefix_len,
+                          const unsigned char *suffix, size_t suffix_len,
+                          const unsigned char *subject, size_t subject_len,
+                          unsigned int flags)
+{
+    const unsigned char *wildcard_start;
+    const unsigned char *wildcard_end;
+    const unsigned char *p;
+    int allow_multi = 0;
+    int allow_idna = 0;
+
+    if (subject_len < prefix_len + suffix_len)
+        return 0;
+    if (!equal_nocase(prefix, prefix_len, subject, prefix_len, flags))
+        return 0;
+    wildcard_start = subject + prefix_len;
+    wildcard_end = subject + (subject_len - suffix_len);
+    if (!equal_nocase(wildcard_end, suffix_len, suffix, suffix_len, flags))
+        return 0;
+    /*
+     * If the wildcard makes up the entire first label, it must match at
+     * least one character.
+     */
+    if (prefix_len == 0 && *suffix == '.') {
+        if (wildcard_start == wildcard_end)
+            return 0;
+        allow_idna = 1;
+        if (flags & X509_CHECK_FLAG_MULTI_LABEL_WILDCARDS)
+            allow_multi = 1;
+    }
+    /* IDNA labels cannot match partial wildcards */
+    if (!allow_idna &&
+        subject_len >= 4 && strncasecmp((char *)subject, "xn--", 4) == 0)
+        return 0;
+    /* The wildcard may match a literal '*' */
+    if (wildcard_end == wildcard_start + 1 && *wildcard_start == '*')
+        return 1;
+    /*
+     * Check that the part matched by the wildcard contains only
+     * permitted characters and only matches a single label unless
+     * allow_multi is set.
+     */
+    for (p = wildcard_start; p != wildcard_end; ++p)
+        if (!(('0' <= *p && *p <= '9') ||
+              ('A' <= *p && *p <= 'Z') ||
+              ('a' <= *p && *p <= 'z') ||
+              *p == '-' || (allow_multi && *p == '.')))
+            return 0;
+    return 1;
+}
+
+#define LABEL_START     (1 << 0)
+#define LABEL_END       (1 << 1)
+#define LABEL_HYPHEN    (1 << 2)
+#define LABEL_IDNA      (1 << 3)
+
+static const unsigned char *valid_star(const unsigned char *p, size_t len,
+                                       unsigned int flags)
+{
+    const unsigned char *star = 0;
+    size_t i;
+    int state = LABEL_START;
+    int dots = 0;
+    for (i = 0; i < len; ++i) {
+        /*
+         * Locate first and only legal wildcard, either at the start
+         * or end of a non-IDNA first and not final label.
+         */
+        if (p[i] == '*') {
+            int atstart = (state & LABEL_START);
+            int atend = (i == len - 1 || p[i + 1] == '.');
+            /*-
+             * At most one wildcard per pattern.
+             * No wildcards in IDNA labels.
+             * No wildcards after the first label.
+             */
+            if (star != NULL || (state & LABEL_IDNA) != 0 || dots)
+                return NULL;
+            /* Only full-label '*.example.com' wildcards? */
+            if ((flags & X509_CHECK_FLAG_NO_PARTIAL_WILDCARDS)
+                && (!atstart || !atend))
+                return NULL;
+            /* No 'foo*bar' wildcards */
+            if (!atstart && !atend)
+                return NULL;
+            star = &p[i];
+            state &= ~LABEL_START;
+        } else if (('a' <= p[i] && p[i] <= 'z')
+                   || ('A' <= p[i] && p[i] <= 'Z')
+                   || ('0' <= p[i] && p[i] <= '9')) {
+            if ((state & LABEL_START) != 0
+                && len - i >= 4 && strncasecmp((char *)&p[i], "xn--", 4) == 0)
+                state |= LABEL_IDNA;
+            state &= ~(LABEL_HYPHEN | LABEL_START);
+        } else if (p[i] == '.') {
+            if ((state & (LABEL_HYPHEN | LABEL_START)) != 0)
+                return NULL;
+            state = LABEL_START;
+            ++dots;
+        } else if (p[i] == '-') {
+            /* no domain/subdomain starts with '-' */
+            if ((state & LABEL_START) != 0)
+                return NULL;
+            state |= LABEL_HYPHEN;
+        } else
+            return NULL;
+    }
+
+    /*
+     * The final label must not end in a hyphen or ".", and
+     * there must be at least two dots after the star.
+     */
+    if ((state & (LABEL_START | LABEL_HYPHEN)) != 0 || dots < 2)
+        return NULL;
+    return star;
+}
+
+/* Compare using wildcards. */
+static int equal_wildcard(const unsigned char *pattern, size_t pattern_len,
+                          const unsigned char *subject, size_t subject_len,
+                          unsigned int flags)
+{
+    const unsigned char *star = NULL;
+
+    /*
+     * Subject names starting with '.' can only match a wildcard pattern
+     * via a subject sub-domain pattern suffix match.
+     */
+    if (!(subject_len > 1 && subject[0] == '.'))
+        star = valid_star(pattern, pattern_len, flags);
+    if (star == NULL)
+        return equal_nocase(pattern, pattern_len,
+                            subject, subject_len, flags);
+    return wildcard_match(pattern, star - pattern,
+                          star + 1, (pattern + pattern_len) - star - 1,
+                          subject, subject_len, flags);
+}
+
+/*
+ * Compare an ASN1_STRING to a supplied string. If they match return 1. If
+ * cmp_type > 0 only compare if string matches the type, otherwise convert it
+ * to UTF8.
+ */
+
+static int do_check_string(const ASN1_STRING *a, int cmp_type, equal_fn equal,
+                           unsigned int flags, const char *b, size_t blen,
+                           char **peername)
+{
+    int rv = 0;
+
+    if (!a->data || !a->length)
+        return 0;
+    if (cmp_type > 0) {
+        if (cmp_type != a->type)
+            return 0;
+        if (cmp_type == V_ASN1_IA5STRING)
+            rv = equal(a->data, a->length, (unsigned char *)b, blen, flags);
+        else if (a->length == (int)blen && !memcmp(a->data, b, blen))
+            rv = 1;
+        if (rv > 0 && peername)
+            *peername = OPENSSL_strndup((char *)a->data, a->length);
+    } else {
+        int astrlen;
+        unsigned char *astr;
+        astrlen = ASN1_STRING_to_UTF8(&astr, a);
+        if (astrlen < 0) {
+            /*
+             * -1 could be an internal malloc failure or a decoding error from
+             * malformed input; we can't distinguish.
+             */
+            return -1;
+        }
+        rv = equal(astr, astrlen, (unsigned char *)b, blen, flags);
+        if (rv > 0 && peername)
+            *peername = OPENSSL_strndup((char *)astr, astrlen);
+        OPENSSL_free(astr);
+    }
+    return rv;
+}
+
+static int do_x509_check(X509 *x, const char *chk, size_t chklen,
+                         unsigned int flags, int check_type, char **peername)
+{
+    GENERAL_NAMES *gens = NULL;
+    X509_NAME *name = NULL;
+    int i;
+    int cnid = NID_undef;
+    int alt_type;
+    int san_present = 0;
+    int rv = 0;
+    equal_fn equal;
+
+    /* See below, this flag is internal-only */
+    flags &= ~_X509_CHECK_FLAG_DOT_SUBDOMAINS;
+    if (check_type == GEN_EMAIL) {
+        cnid = NID_pkcs9_emailAddress;
+        alt_type = V_ASN1_IA5STRING;
+        equal = equal_email;
+    } else if (check_type == GEN_DNS) {
+        cnid = NID_commonName;
+        /* Implicit client-side DNS sub-domain pattern */
+        if (chklen > 1 && chk[0] == '.')
+            flags |= _X509_CHECK_FLAG_DOT_SUBDOMAINS;
+        alt_type = V_ASN1_IA5STRING;
+        if (flags & X509_CHECK_FLAG_NO_WILDCARDS)
+            equal = equal_nocase;
+        else
+            equal = equal_wildcard;
+    } else {
+        alt_type = V_ASN1_OCTET_STRING;
+        equal = equal_case;
+    }
+
+    if (chklen == 0)
+        chklen = strlen(chk);
+
+    gens = X509_get_ext_d2i(x, NID_subject_alt_name, NULL, NULL);
+    if (gens) {
+        for (i = 0; i < sk_GENERAL_NAME_num(gens); i++) {
+            GENERAL_NAME *gen;
+            ASN1_STRING *cstr;
+            gen = sk_GENERAL_NAME_value(gens, i);
+            if (gen->type != check_type)
+                continue;
+            san_present = 1;
+            if (check_type == GEN_EMAIL)
+                cstr = gen->d.rfc822Name;
+            else if (check_type == GEN_DNS)
+                cstr = gen->d.dNSName;
+            else
+                cstr = gen->d.iPAddress;
+            /* Positive on success, negative on error! */
+            if ((rv = do_check_string(cstr, alt_type, equal, flags,
+                                      chk, chklen, peername)) != 0)
+                break;
+        }
+        GENERAL_NAMES_free(gens);
+        if (rv != 0)
+            return rv;
+        if (san_present && !(flags & X509_CHECK_FLAG_ALWAYS_CHECK_SUBJECT))
+            return 0;
+    }
+
+    /* We're done if CN-ID is not pertinent */
+    if (cnid == NID_undef || (flags & X509_CHECK_FLAG_NEVER_CHECK_SUBJECT))
+        return 0;
+
+    i = -1;
+    name = X509_get_subject_name(x);
+    while ((i = X509_NAME_get_index_by_NID(name, cnid, i)) >= 0) {
+        const X509_NAME_ENTRY *ne = X509_NAME_get_entry(name, i);
+        const ASN1_STRING *str = X509_NAME_ENTRY_get_data(ne);
+
+        /* Positive on success, negative on error! */
+        if ((rv = do_check_string(str, -1, equal, flags,
+                                  chk, chklen, peername)) != 0)
+            return rv;
+    }
+    return 0;
+}
+
+int X509_check_host(X509 *x, const char *chk, size_t chklen,
+                    unsigned int flags, char **peername)
+{
+    if (chk == NULL)
+        return -2;
+    /*
+     * Embedded NULs are disallowed, except as the last character of a
+     * string of length 2 or more (tolerate caller including terminating
+     * NUL in string length).
+     */
+    if (chklen == 0)
+        chklen = strlen(chk);
+    else if (memchr(chk, '\0', chklen > 1 ? chklen - 1 : chklen))
+        return -2;
+    if (chklen > 1 && chk[chklen - 1] == '\0')
+        --chklen;
+    return do_x509_check(x, chk, chklen, flags, GEN_DNS, peername);
+}
+
+int X509_check_email(X509 *x, const char *chk, size_t chklen,
+                     unsigned int flags)
+{
+    if (chk == NULL)
+        return -2;
+    /*
+     * Embedded NULs are disallowed, except as the last character of a
+     * string of length 2 or more (tolerate caller including terminating
+     * NUL in string length).
+     */
+    if (chklen == 0)
+        chklen = strlen((char *)chk);
+    else if (memchr(chk, '\0', chklen > 1 ? chklen - 1 : chklen))
+        return -2;
+    if (chklen > 1 && chk[chklen - 1] == '\0')
+        --chklen;
+    return do_x509_check(x, chk, chklen, flags, GEN_EMAIL, NULL);
+}
+
+int X509_check_ip(X509 *x, const unsigned char *chk, size_t chklen,
+                  unsigned int flags)
+{
+    if (chk == NULL)
+        return -2;
+    return do_x509_check(x, (char *)chk, chklen, flags, GEN_IPADD, NULL);
+}
+
+int X509_check_ip_asc(X509 *x, const char *ipasc, unsigned int flags)
+{
+    unsigned char ipout[16];
+    size_t iplen;
+
+    if (ipasc == NULL)
+        return -2;
+    iplen = (size_t)a2i_ipadd(ipout, ipasc);
+    if (iplen == 0)
+        return -2;
+    return do_x509_check(x, (char *)ipout, iplen, flags, GEN_IPADD, NULL);
+}
+
+/*
+ * Convert IP addresses both IPv4 and IPv6 into an OCTET STRING compatible
+ * with RFC3280.
+ */
+
+ASN1_OCTET_STRING *a2i_IPADDRESS(const char *ipasc)
+{
+    unsigned char ipout[16];
+    ASN1_OCTET_STRING *ret;
+    int iplen;
+
+    /* If string contains a ':' assume IPv6 */
+
+    iplen = a2i_ipadd(ipout, ipasc);
+
+    if (!iplen)
+        return NULL;
+
+    ret = ASN1_OCTET_STRING_new();
+    if (ret == NULL)
+        return NULL;
+    if (!ASN1_OCTET_STRING_set(ret, ipout, iplen)) {
+        ASN1_OCTET_STRING_free(ret);
+        return NULL;
+    }
+    return ret;
+}
+
+ASN1_OCTET_STRING *a2i_IPADDRESS_NC(const char *ipasc)
+{
+    ASN1_OCTET_STRING *ret = NULL;
+    unsigned char ipout[32];
+    char *iptmp = NULL, *p;
+    int iplen1, iplen2;
+    p = strchr(ipasc, '/');
+    if (!p)
+        return NULL;
+    iptmp = OPENSSL_strdup(ipasc);
+    if (!iptmp)
+        return NULL;
+    p = iptmp + (p - ipasc);
+    *p++ = 0;
+
+    iplen1 = a2i_ipadd(ipout, iptmp);
+
+    if (!iplen1)
+        goto err;
+
+    iplen2 = a2i_ipadd(ipout + iplen1, p);
+
+    OPENSSL_free(iptmp);
+    iptmp = NULL;
+
+    if (!iplen2 || (iplen1 != iplen2))
+        goto err;
+
+    ret = ASN1_OCTET_STRING_new();
+    if (ret == NULL)
+        goto err;
+    if (!ASN1_OCTET_STRING_set(ret, ipout, iplen1 + iplen2))
+        goto err;
+
+    return ret;
+
+ err:
+    OPENSSL_free(iptmp);
+    ASN1_OCTET_STRING_free(ret);
+    return NULL;
+}
+
+int a2i_ipadd(unsigned char *ipout, const char *ipasc)
+{
+    /* If string contains a ':' assume IPv6 */
+
+    if (strchr(ipasc, ':')) {
+        if (!ipv6_from_asc(ipout, ipasc))
+            return 0;
+        return 16;
+    } else {
+        if (!ipv4_from_asc(ipout, ipasc))
+            return 0;
+        return 4;
+    }
+}
+
+static int ipv4_from_asc(unsigned char *v4, const char *in)
+{
+    int a0, a1, a2, a3;
+    if (sscanf(in, "%d.%d.%d.%d", &a0, &a1, &a2, &a3) != 4)
+        return 0;
+    if ((a0 < 0) || (a0 > 255) || (a1 < 0) || (a1 > 255)
+        || (a2 < 0) || (a2 > 255) || (a3 < 0) || (a3 > 255))
+        return 0;
+    v4[0] = a0;
+    v4[1] = a1;
+    v4[2] = a2;
+    v4[3] = a3;
+    return 1;
+}
+
+typedef struct {
+    /* Temporary store for IPV6 output */
+    unsigned char tmp[16];
+    /* Total number of bytes in tmp */
+    int total;
+    /* The position of a zero (corresponding to '::') */
+    int zero_pos;
+    /* Number of zeroes */
+    int zero_cnt;
+} IPV6_STAT;
+
+static int ipv6_from_asc(unsigned char *v6, const char *in)
+{
+    IPV6_STAT v6stat;
+    v6stat.total = 0;
+    v6stat.zero_pos = -1;
+    v6stat.zero_cnt = 0;
+    /*
+     * Treat the IPv6 representation as a list of values separated by ':'.
+     * The presence of a '::' will parse as one, two or three zero length
+     * elements.
+     */
+    if (!CONF_parse_list(in, ':', 0, ipv6_cb, &v6stat))
+        return 0;
+
+    /* Now for some sanity checks */
+
+    if (v6stat.zero_pos == -1) {
+        /* If no '::' must have exactly 16 bytes */
+        if (v6stat.total != 16)
+            return 0;
+    } else {
+        /* If '::' must have less than 16 bytes */
+        if (v6stat.total == 16)
+            return 0;
+        /* More than three zeroes is an error */
+        if (v6stat.zero_cnt > 3)
+            return 0;
+        /* Can only have three zeroes if nothing else present */
+        else if (v6stat.zero_cnt == 3) {
+            if (v6stat.total > 0)
+                return 0;
+        }
+        /* Can only have two zeroes if at start or end */
+        else if (v6stat.zero_cnt == 2) {
+            if ((v6stat.zero_pos != 0)
+                && (v6stat.zero_pos != v6stat.total))
+                return 0;
+        } else
+            /* Can only have one zero if *not* start or end */
+        {
+            if ((v6stat.zero_pos == 0)
+                || (v6stat.zero_pos == v6stat.total))
+                return 0;
+        }
+    }
+
+    /* Format result */
+
+    if (v6stat.zero_pos >= 0) {
+        /* Copy initial part */
+        memcpy(v6, v6stat.tmp, v6stat.zero_pos);
+        /* Zero middle */
+        memset(v6 + v6stat.zero_pos, 0, 16 - v6stat.total);
+        /* Copy final part */
+        if (v6stat.total != v6stat.zero_pos)
+            memcpy(v6 + v6stat.zero_pos + 16 - v6stat.total,
+                   v6stat.tmp + v6stat.zero_pos,
+                   v6stat.total - v6stat.zero_pos);
+    } else
+        memcpy(v6, v6stat.tmp, 16);
+
+    return 1;
+}
+
+static int ipv6_cb(const char *elem, int len, void *usr)
+{
+    IPV6_STAT *s = usr;
+    /* Error if 16 bytes written */
+    if (s->total == 16)
+        return 0;
+    if (len == 0) {
+        /* Zero length element, corresponds to '::' */
+        if (s->zero_pos == -1)
+            s->zero_pos = s->total;
+        /* If we've already got a :: its an error */
+        else if (s->zero_pos != s->total)
+            return 0;
+        s->zero_cnt++;
+    } else {
+        /* If more than 4 characters could be final a.b.c.d form */
+        if (len > 4) {
+            /* Need at least 4 bytes left */
+            if (s->total > 12)
+                return 0;
+            /* Must be end of string */
+            if (elem[len])
+                return 0;
+            if (!ipv4_from_asc(s->tmp + s->total, elem))
+                return 0;
+            s->total += 4;
+        } else {
+            if (!ipv6_hex(s->tmp + s->total, elem, len))
+                return 0;
+            s->total += 2;
+        }
+    }
+    return 1;
+}
+
+/*
+ * Convert a string of up to 4 hex digits into the corresponding IPv6 form.
+ */
+
+static int ipv6_hex(unsigned char *out, const char *in, int inlen)
+{
+    unsigned char c;
+    unsigned int num = 0;
+    int x;
+
+    if (inlen > 4)
+        return 0;
+    while (inlen--) {
+        c = *in++;
+        num <<= 4;
+        x = OPENSSL_hexchar2int(c);
+        if (x < 0)
+            return 0;
+        num |= (char)x;
+    }
+    out[0] = num >> 8;
+    out[1] = num & 0xff;
+    return 1;
+}
+
+int X509V3_NAME_from_section(X509_NAME *nm, STACK_OF(CONF_VALUE) *dn_sk,
+                             unsigned long chtype)
+{
+    CONF_VALUE *v;
+    int i, mval, spec_char, plus_char;
+    char *p, *type;
+    if (!nm)
+        return 0;
+
+    for (i = 0; i < sk_CONF_VALUE_num(dn_sk); i++) {
+        v = sk_CONF_VALUE_value(dn_sk, i);
+        type = v->name;
+        /*
+         * Skip past any leading X. X: X, etc to allow for multiple instances
+         */
+        for (p = type; *p; p++) {
+#ifndef CHARSET_EBCDIC
+            spec_char = ((*p == ':') || (*p == ',') || (*p == '.'));
+#else
+            spec_char = ((*p == os_toascii[':']) || (*p == os_toascii[','])
+                    || (*p == os_toascii['.']));
+#endif
+            if (spec_char) {
+                p++;
+                if (*p)
+                    type = p;
+                break;
+            }
+        }
+#ifndef CHARSET_EBCDIC
+        plus_char = (*type == '+');
+#else
+        plus_char = (*type == os_toascii['+']);
+#endif
+        if (plus_char) {
+            mval = -1;
+            type++;
+        } else
+            mval = 0;
+        if (!X509_NAME_add_entry_by_txt(nm, type, chtype,
+                                        (unsigned char *)v->value, -1, -1,
+                                        mval))
+            return 0;
+
+    }
+    return 1;
+}