diff options
Diffstat (limited to 'openssl-1.1.0h/crypto/asn1/a_strex.c')
| -rw-r--r-- | openssl-1.1.0h/crypto/asn1/a_strex.c | 644 |
1 files changed, 644 insertions, 0 deletions
diff --git a/openssl-1.1.0h/crypto/asn1/a_strex.c b/openssl-1.1.0h/crypto/asn1/a_strex.c new file mode 100644 index 0000000..b91266b --- /dev/null +++ b/openssl-1.1.0h/crypto/asn1/a_strex.c @@ -0,0 +1,644 @@ +/* + * Copyright 2000-2016 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 + */ + +#include <stdio.h> +#include <string.h> +#include "internal/cryptlib.h" +#include "internal/asn1_int.h" +#include <openssl/crypto.h> +#include <openssl/x509.h> +#include <openssl/asn1.h> + +#include "charmap.h" + +/* + * ASN1_STRING_print_ex() and X509_NAME_print_ex(). Enhanced string and name + * printing routines handling multibyte characters, RFC2253 and a host of + * other options. + */ + +#define CHARTYPE_BS_ESC (ASN1_STRFLGS_ESC_2253 | CHARTYPE_FIRST_ESC_2253 | CHARTYPE_LAST_ESC_2253) + +#define ESC_FLAGS (ASN1_STRFLGS_ESC_2253 | \ + ASN1_STRFLGS_ESC_2254 | \ + ASN1_STRFLGS_ESC_QUOTE | \ + ASN1_STRFLGS_ESC_CTRL | \ + ASN1_STRFLGS_ESC_MSB) + +/* + * Three IO functions for sending data to memory, a BIO and and a FILE + * pointer. + */ +static int send_bio_chars(void *arg, const void *buf, int len) +{ + if (!arg) + return 1; + if (BIO_write(arg, buf, len) != len) + return 0; + return 1; +} + +#ifndef OPENSSL_NO_STDIO +static int send_fp_chars(void *arg, const void *buf, int len) +{ + if (!arg) + return 1; + if (fwrite(buf, 1, len, arg) != (unsigned int)len) + return 0; + return 1; +} +#endif + +typedef int char_io (void *arg, const void *buf, int len); + +/* + * This function handles display of strings, one character at a time. It is + * passed an unsigned long for each character because it could come from 2 or + * even 4 byte forms. + */ + +static int do_esc_char(unsigned long c, unsigned short flags, char *do_quotes, + char_io *io_ch, void *arg) +{ + unsigned short chflgs; + unsigned char chtmp; + char tmphex[HEX_SIZE(long) + 3]; + + if (c > 0xffffffffL) + return -1; + if (c > 0xffff) { + BIO_snprintf(tmphex, sizeof(tmphex), "\\W%08lX", c); + if (!io_ch(arg, tmphex, 10)) + return -1; + return 10; + } + if (c > 0xff) { + BIO_snprintf(tmphex, sizeof(tmphex), "\\U%04lX", c); + if (!io_ch(arg, tmphex, 6)) + return -1; + return 6; + } + chtmp = (unsigned char)c; + if (chtmp > 0x7f) + chflgs = flags & ASN1_STRFLGS_ESC_MSB; + else + chflgs = char_type[chtmp] & flags; + if (chflgs & CHARTYPE_BS_ESC) { + /* If we don't escape with quotes, signal we need quotes */ + if (chflgs & ASN1_STRFLGS_ESC_QUOTE) { + if (do_quotes) + *do_quotes = 1; + if (!io_ch(arg, &chtmp, 1)) + return -1; + return 1; + } + if (!io_ch(arg, "\\", 1)) + return -1; + if (!io_ch(arg, &chtmp, 1)) + return -1; + return 2; + } + if (chflgs & (ASN1_STRFLGS_ESC_CTRL + | ASN1_STRFLGS_ESC_MSB + | ASN1_STRFLGS_ESC_2254)) { + BIO_snprintf(tmphex, 11, "\\%02X", chtmp); + if (!io_ch(arg, tmphex, 3)) + return -1; + return 3; + } + /* + * If we get this far and do any escaping at all must escape the escape + * character itself: backslash. + */ + if (chtmp == '\\' && (flags & ESC_FLAGS)) { + if (!io_ch(arg, "\\\\", 2)) + return -1; + return 2; + } + if (!io_ch(arg, &chtmp, 1)) + return -1; + return 1; +} + +#define BUF_TYPE_WIDTH_MASK 0x7 +#define BUF_TYPE_CONVUTF8 0x8 + +/* + * This function sends each character in a buffer to do_esc_char(). It + * interprets the content formats and converts to or from UTF8 as + * appropriate. + */ + +static int do_buf(unsigned char *buf, int buflen, + int type, unsigned short flags, char *quotes, char_io *io_ch, + void *arg) +{ + int i, outlen, len; + unsigned short orflags; + unsigned char *p, *q; + unsigned long c; + + p = buf; + q = buf + buflen; + outlen = 0; + while (p != q) { + if (p == buf && flags & ASN1_STRFLGS_ESC_2253) + orflags = CHARTYPE_FIRST_ESC_2253; + else + orflags = 0; + switch (type & BUF_TYPE_WIDTH_MASK) { + case 4: + c = ((unsigned long)*p++) << 24; + c |= ((unsigned long)*p++) << 16; + c |= ((unsigned long)*p++) << 8; + c |= *p++; + break; + + case 2: + c = ((unsigned long)*p++) << 8; + c |= *p++; + break; + + case 1: + c = *p++; + break; + + case 0: + i = UTF8_getc(p, buflen, &c); + if (i < 0) + return -1; /* Invalid UTF8String */ + p += i; + break; + default: + return -1; /* invalid width */ + } + if (p == q && flags & ASN1_STRFLGS_ESC_2253) + orflags = CHARTYPE_LAST_ESC_2253; + if (type & BUF_TYPE_CONVUTF8) { + unsigned char utfbuf[6]; + int utflen; + utflen = UTF8_putc(utfbuf, sizeof(utfbuf), c); + for (i = 0; i < utflen; i++) { + /* + * We don't need to worry about setting orflags correctly + * because if utflen==1 its value will be correct anyway + * otherwise each character will be > 0x7f and so the + * character will never be escaped on first and last. + */ + len = do_esc_char(utfbuf[i], flags | orflags, quotes, + io_ch, arg); + if (len < 0) + return -1; + outlen += len; + } + } else { + len = do_esc_char(c, flags | orflags, quotes, + io_ch, arg); + if (len < 0) + return -1; + outlen += len; + } + } + return outlen; +} + +/* This function hex dumps a buffer of characters */ + +static int do_hex_dump(char_io *io_ch, void *arg, unsigned char *buf, + int buflen) +{ + static const char hexdig[] = "0123456789ABCDEF"; + unsigned char *p, *q; + char hextmp[2]; + if (arg) { + p = buf; + q = buf + buflen; + while (p != q) { + hextmp[0] = hexdig[*p >> 4]; + hextmp[1] = hexdig[*p & 0xf]; + if (!io_ch(arg, hextmp, 2)) + return -1; + p++; + } + } + return buflen << 1; +} + +/* + * "dump" a string. This is done when the type is unknown, or the flags + * request it. We can either dump the content octets or the entire DER + * encoding. This uses the RFC2253 #01234 format. + */ + +static int do_dump(unsigned long lflags, char_io *io_ch, void *arg, + const ASN1_STRING *str) +{ + /* + * Placing the ASN1_STRING in a temp ASN1_TYPE allows the DER encoding to + * readily obtained + */ + ASN1_TYPE t; + unsigned char *der_buf, *p; + int outlen, der_len; + + if (!io_ch(arg, "#", 1)) + return -1; + /* If we don't dump DER encoding just dump content octets */ + if (!(lflags & ASN1_STRFLGS_DUMP_DER)) { + outlen = do_hex_dump(io_ch, arg, str->data, str->length); + if (outlen < 0) + return -1; + return outlen + 1; + } + t.type = str->type; + t.value.ptr = (char *)str; + der_len = i2d_ASN1_TYPE(&t, NULL); + der_buf = OPENSSL_malloc(der_len); + if (der_buf == NULL) + return -1; + p = der_buf; + i2d_ASN1_TYPE(&t, &p); + outlen = do_hex_dump(io_ch, arg, der_buf, der_len); + OPENSSL_free(der_buf); + if (outlen < 0) + return -1; + return outlen + 1; +} + +/* + * Lookup table to convert tags to character widths, 0 = UTF8 encoded, -1 is + * used for non string types otherwise it is the number of bytes per + * character + */ + +static const signed char tag2nbyte[] = { + -1, -1, -1, -1, -1, /* 0-4 */ + -1, -1, -1, -1, -1, /* 5-9 */ + -1, -1, 0, -1, /* 10-13 */ + -1, -1, -1, -1, /* 15-17 */ + 1, 1, 1, /* 18-20 */ + -1, 1, 1, 1, /* 21-24 */ + -1, 1, -1, /* 25-27 */ + 4, -1, 2 /* 28-30 */ +}; + +/* + * This is the main function, print out an ASN1_STRING taking note of various + * escape and display options. Returns number of characters written or -1 if + * an error occurred. + */ + +static int do_print_ex(char_io *io_ch, void *arg, unsigned long lflags, + const ASN1_STRING *str) +{ + int outlen, len; + int type; + char quotes; + unsigned short flags; + quotes = 0; + /* Keep a copy of escape flags */ + flags = (unsigned short)(lflags & ESC_FLAGS); + + type = str->type; + + outlen = 0; + + if (lflags & ASN1_STRFLGS_SHOW_TYPE) { + const char *tagname; + tagname = ASN1_tag2str(type); + outlen += strlen(tagname); + if (!io_ch(arg, tagname, outlen) || !io_ch(arg, ":", 1)) + return -1; + outlen++; + } + + /* Decide what to do with type, either dump content or display it */ + + /* Dump everything */ + if (lflags & ASN1_STRFLGS_DUMP_ALL) + type = -1; + /* Ignore the string type */ + else if (lflags & ASN1_STRFLGS_IGNORE_TYPE) + type = 1; + else { + /* Else determine width based on type */ + if ((type > 0) && (type < 31)) + type = tag2nbyte[type]; + else + type = -1; + if ((type == -1) && !(lflags & ASN1_STRFLGS_DUMP_UNKNOWN)) + type = 1; + } + + if (type == -1) { + len = do_dump(lflags, io_ch, arg, str); + if (len < 0) + return -1; + outlen += len; + return outlen; + } + + if (lflags & ASN1_STRFLGS_UTF8_CONVERT) { + /* + * Note: if string is UTF8 and we want to convert to UTF8 then we + * just interpret it as 1 byte per character to avoid converting + * twice. + */ + if (!type) + type = 1; + else + type |= BUF_TYPE_CONVUTF8; + } + + len = do_buf(str->data, str->length, type, flags, "es, io_ch, NULL); + if (len < 0) + return -1; + outlen += len; + if (quotes) + outlen += 2; + if (!arg) + return outlen; + if (quotes && !io_ch(arg, "\"", 1)) + return -1; + if (do_buf(str->data, str->length, type, flags, NULL, io_ch, arg) < 0) + return -1; + if (quotes && !io_ch(arg, "\"", 1)) + return -1; + return outlen; +} + +/* Used for line indenting: print 'indent' spaces */ + +static int do_indent(char_io *io_ch, void *arg, int indent) +{ + int i; + for (i = 0; i < indent; i++) + if (!io_ch(arg, " ", 1)) + return 0; + return 1; +} + +#define FN_WIDTH_LN 25 +#define FN_WIDTH_SN 10 + +static int do_name_ex(char_io *io_ch, void *arg, const X509_NAME *n, + int indent, unsigned long flags) +{ + int i, prev = -1, orflags, cnt; + int fn_opt, fn_nid; + ASN1_OBJECT *fn; + const ASN1_STRING *val; + const X509_NAME_ENTRY *ent; + char objtmp[80]; + const char *objbuf; + int outlen, len; + char *sep_dn, *sep_mv, *sep_eq; + int sep_dn_len, sep_mv_len, sep_eq_len; + if (indent < 0) + indent = 0; + outlen = indent; + if (!do_indent(io_ch, arg, indent)) + return -1; + switch (flags & XN_FLAG_SEP_MASK) { + case XN_FLAG_SEP_MULTILINE: + sep_dn = "\n"; + sep_dn_len = 1; + sep_mv = " + "; + sep_mv_len = 3; + break; + + case XN_FLAG_SEP_COMMA_PLUS: + sep_dn = ","; + sep_dn_len = 1; + sep_mv = "+"; + sep_mv_len = 1; + indent = 0; + break; + + case XN_FLAG_SEP_CPLUS_SPC: + sep_dn = ", "; + sep_dn_len = 2; + sep_mv = " + "; + sep_mv_len = 3; + indent = 0; + break; + + case XN_FLAG_SEP_SPLUS_SPC: + sep_dn = "; "; + sep_dn_len = 2; + sep_mv = " + "; + sep_mv_len = 3; + indent = 0; + break; + + default: + return -1; + } + + if (flags & XN_FLAG_SPC_EQ) { + sep_eq = " = "; + sep_eq_len = 3; + } else { + sep_eq = "="; + sep_eq_len = 1; + } + + fn_opt = flags & XN_FLAG_FN_MASK; + + cnt = X509_NAME_entry_count(n); + for (i = 0; i < cnt; i++) { + if (flags & XN_FLAG_DN_REV) + ent = X509_NAME_get_entry(n, cnt - i - 1); + else + ent = X509_NAME_get_entry(n, i); + if (prev != -1) { + if (prev == X509_NAME_ENTRY_set(ent)) { + if (!io_ch(arg, sep_mv, sep_mv_len)) + return -1; + outlen += sep_mv_len; + } else { + if (!io_ch(arg, sep_dn, sep_dn_len)) + return -1; + outlen += sep_dn_len; + if (!do_indent(io_ch, arg, indent)) + return -1; + outlen += indent; + } + } + prev = X509_NAME_ENTRY_set(ent); + fn = X509_NAME_ENTRY_get_object(ent); + val = X509_NAME_ENTRY_get_data(ent); + fn_nid = OBJ_obj2nid(fn); + if (fn_opt != XN_FLAG_FN_NONE) { + int objlen, fld_len; + if ((fn_opt == XN_FLAG_FN_OID) || (fn_nid == NID_undef)) { + OBJ_obj2txt(objtmp, sizeof(objtmp), fn, 1); + fld_len = 0; /* XXX: what should this be? */ + objbuf = objtmp; + } else { + if (fn_opt == XN_FLAG_FN_SN) { + fld_len = FN_WIDTH_SN; + objbuf = OBJ_nid2sn(fn_nid); + } else if (fn_opt == XN_FLAG_FN_LN) { + fld_len = FN_WIDTH_LN; + objbuf = OBJ_nid2ln(fn_nid); + } else { + fld_len = 0; /* XXX: what should this be? */ + objbuf = ""; + } + } + objlen = strlen(objbuf); + if (!io_ch(arg, objbuf, objlen)) + return -1; + if ((objlen < fld_len) && (flags & XN_FLAG_FN_ALIGN)) { + if (!do_indent(io_ch, arg, fld_len - objlen)) + return -1; + outlen += fld_len - objlen; + } + if (!io_ch(arg, sep_eq, sep_eq_len)) + return -1; + outlen += objlen + sep_eq_len; + } + /* + * If the field name is unknown then fix up the DER dump flag. We + * might want to limit this further so it will DER dump on anything + * other than a few 'standard' fields. + */ + if ((fn_nid == NID_undef) && (flags & XN_FLAG_DUMP_UNKNOWN_FIELDS)) + orflags = ASN1_STRFLGS_DUMP_ALL; + else + orflags = 0; + + len = do_print_ex(io_ch, arg, flags | orflags, val); + if (len < 0) + return -1; + outlen += len; + } + return outlen; +} + +/* Wrappers round the main functions */ + +int X509_NAME_print_ex(BIO *out, const X509_NAME *nm, int indent, + unsigned long flags) +{ + if (flags == XN_FLAG_COMPAT) + return X509_NAME_print(out, nm, indent); + return do_name_ex(send_bio_chars, out, nm, indent, flags); +} + +#ifndef OPENSSL_NO_STDIO +int X509_NAME_print_ex_fp(FILE *fp, const X509_NAME *nm, int indent, + unsigned long flags) +{ + if (flags == XN_FLAG_COMPAT) { + BIO *btmp; + int ret; + btmp = BIO_new_fp(fp, BIO_NOCLOSE); + if (!btmp) + return -1; + ret = X509_NAME_print(btmp, nm, indent); + BIO_free(btmp); + return ret; + } + return do_name_ex(send_fp_chars, fp, nm, indent, flags); +} +#endif + +int ASN1_STRING_print_ex(BIO *out, const ASN1_STRING *str, unsigned long flags) +{ + return do_print_ex(send_bio_chars, out, flags, str); +} + +#ifndef OPENSSL_NO_STDIO +int ASN1_STRING_print_ex_fp(FILE *fp, const ASN1_STRING *str, unsigned long flags) +{ + return do_print_ex(send_fp_chars, fp, flags, str); +} +#endif + +/* + * Utility function: convert any string type to UTF8, returns number of bytes + * in output string or a negative error code + */ + +int ASN1_STRING_to_UTF8(unsigned char **out, const ASN1_STRING *in) +{ + ASN1_STRING stmp, *str = &stmp; + int mbflag, type, ret; + if (!in) + return -1; + type = in->type; + if ((type < 0) || (type > 30)) + return -1; + mbflag = tag2nbyte[type]; + if (mbflag == -1) + return -1; + mbflag |= MBSTRING_FLAG; + stmp.data = NULL; + stmp.length = 0; + stmp.flags = 0; + ret = + ASN1_mbstring_copy(&str, in->data, in->length, mbflag, + B_ASN1_UTF8STRING); + if (ret < 0) + return ret; + *out = stmp.data; + return stmp.length; +} + +/* Return 1 if host is a valid hostname and 0 otherwise */ +int asn1_valid_host(const ASN1_STRING *host) +{ + int hostlen = host->length; + const unsigned char *hostptr = host->data; + int type = host->type; + int i; + signed char width = -1; + unsigned short chflags = 0, prevchflags; + + if (type > 0 && type < 31) + width = tag2nbyte[type]; + if (width == -1 || hostlen == 0) + return 0; + /* Treat UTF8String as width 1 as any MSB set is invalid */ + if (width == 0) + width = 1; + for (i = 0 ; i < hostlen; i+= width) { + prevchflags = chflags; + /* Value must be <= 0x7F: check upper bytes are all zeroes */ + if (width == 4) { + if (*hostptr++ != 0 || *hostptr++ != 0 || *hostptr++ != 0) + return 0; + } else if (width == 2) { + if (*hostptr++ != 0) + return 0; + } + if (*hostptr > 0x7f) + return 0; + chflags = char_type[*hostptr++]; + if (!(chflags & (CHARTYPE_HOST_ANY | CHARTYPE_HOST_WILD))) { + /* Nothing else allowed at start or end of string */ + if (i == 0 || i == hostlen - 1) + return 0; + /* Otherwise invalid if not dot or hyphen */ + if (!(chflags & (CHARTYPE_HOST_DOT | CHARTYPE_HOST_HYPHEN))) + return 0; + /* + * If previous is dot or hyphen then illegal unless both + * are hyphens: as .- -. .. are all illegal + */ + if (prevchflags & (CHARTYPE_HOST_DOT | CHARTYPE_HOST_HYPHEN) + && ((prevchflags & CHARTYPE_HOST_DOT) + || (chflags & CHARTYPE_HOST_DOT))) + return 0; + } + } + return 1; +} |