| /* |
| * Copyright 1995-2021 The OpenSSL Project Authors. All Rights Reserved. |
| * |
| * Licensed under the Apache License 2.0 (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 "internal/cryptlib.h" |
| #include <openssl/buffer.h> |
| #include <openssl/objects.h> |
| #include <openssl/asn1.h> |
| |
| #ifndef ASN1_PARSE_MAXDEPTH |
| #define ASN1_PARSE_MAXDEPTH 128 |
| #endif |
| |
| static int asn1_parse2(BIO *bp, const unsigned char **pp, long length, |
| int offset, int depth, int indent, int dump); |
| static int asn1_print_info(BIO *bp, long offset, int depth, int hl, long len, |
| int tag, int xclass, int constructed, int indent) |
| { |
| char str[128]; |
| const char *p; |
| int pop_f_prefix = 0; |
| long saved_indent = -1; |
| int i = 0; |
| BIO *bio = NULL; |
| |
| if (constructed & V_ASN1_CONSTRUCTED) |
| p = "cons: "; |
| else |
| p = "prim: "; |
| if (constructed != (V_ASN1_CONSTRUCTED | 1)) { |
| if (BIO_snprintf(str, sizeof(str), "%5ld:d=%-2d hl=%ld l=%4ld %s", |
| offset, depth, (long)hl, len, p) <= 0) |
| goto err; |
| } else { |
| if (BIO_snprintf(str, sizeof(str), "%5ld:d=%-2d hl=%ld l=inf %s", |
| offset, depth, (long)hl, p) <= 0) |
| goto err; |
| } |
| if (bp != NULL) { |
| if (BIO_set_prefix(bp, str) <= 0) { |
| if ((bio = BIO_new(BIO_f_prefix())) == NULL |
| || (bp = BIO_push(bio, bp)) == NULL) |
| goto err; |
| pop_f_prefix = 1; |
| } |
| saved_indent = BIO_get_indent(bp); |
| if (BIO_set_prefix(bp, str) <= 0 || BIO_set_indent(bp, indent) < 0) |
| goto err; |
| } |
| |
| /* |
| * BIO_set_prefix made a copy of |str|, so we can safely use it for |
| * something else, ASN.1 tag printout. |
| */ |
| p = str; |
| if ((xclass & V_ASN1_PRIVATE) == V_ASN1_PRIVATE) |
| BIO_snprintf(str, sizeof(str), "priv [ %d ] ", tag); |
| else if ((xclass & V_ASN1_CONTEXT_SPECIFIC) == V_ASN1_CONTEXT_SPECIFIC) |
| BIO_snprintf(str, sizeof(str), "cont [ %d ]", tag); |
| else if ((xclass & V_ASN1_APPLICATION) == V_ASN1_APPLICATION) |
| BIO_snprintf(str, sizeof(str), "appl [ %d ]", tag); |
| else if (tag > 30) |
| BIO_snprintf(str, sizeof(str), "<ASN1 %d>", tag); |
| else |
| p = ASN1_tag2str(tag); |
| |
| i = (BIO_printf(bp, "%-18s", p) > 0); |
| err: |
| if (saved_indent >= 0) |
| BIO_set_indent(bp, saved_indent); |
| if (pop_f_prefix) |
| BIO_pop(bp); |
| BIO_free(bio); |
| return i; |
| } |
| |
| int ASN1_parse(BIO *bp, const unsigned char *pp, long len, int indent) |
| { |
| return asn1_parse2(bp, &pp, len, 0, 0, indent, 0); |
| } |
| |
| int ASN1_parse_dump(BIO *bp, const unsigned char *pp, long len, int indent, |
| int dump) |
| { |
| return asn1_parse2(bp, &pp, len, 0, 0, indent, dump); |
| } |
| |
| static int asn1_parse2(BIO *bp, const unsigned char **pp, long length, |
| int offset, int depth, int indent, int dump) |
| { |
| const unsigned char *p, *ep, *tot, *op, *opp; |
| long len; |
| int tag, xclass, ret = 0; |
| int nl, hl, j, r; |
| ASN1_OBJECT *o = NULL; |
| ASN1_OCTET_STRING *os = NULL; |
| ASN1_INTEGER *ai = NULL; |
| ASN1_ENUMERATED *ae = NULL; |
| /* ASN1_BMPSTRING *bmp=NULL; */ |
| int dump_indent, dump_cont = 0; |
| |
| if (depth > ASN1_PARSE_MAXDEPTH) { |
| BIO_puts(bp, "BAD RECURSION DEPTH\n"); |
| return 0; |
| } |
| |
| dump_indent = 6; /* Because we know BIO_dump_indent() */ |
| p = *pp; |
| tot = p + length; |
| while (length > 0) { |
| op = p; |
| j = ASN1_get_object(&p, &len, &tag, &xclass, length); |
| if (j & 0x80) { |
| BIO_puts(bp, "Error in encoding\n"); |
| goto end; |
| } |
| hl = (p - op); |
| length -= hl; |
| /* |
| * if j == 0x21 it is a constructed indefinite length object |
| */ |
| if (!asn1_print_info(bp, (long)offset + (long)(op - *pp), depth, |
| hl, len, tag, xclass, j, (indent) ? depth : 0)) |
| goto end; |
| if (j & V_ASN1_CONSTRUCTED) { |
| const unsigned char *sp = p; |
| |
| ep = p + len; |
| if (BIO_write(bp, "\n", 1) <= 0) |
| goto end; |
| if (len > length) { |
| BIO_printf(bp, "length is greater than %ld\n", length); |
| goto end; |
| } |
| if ((j == 0x21) && (len == 0)) { |
| for (;;) { |
| r = asn1_parse2(bp, &p, (long)(tot - p), |
| offset + (p - *pp), depth + 1, |
| indent, dump); |
| if (r == 0) |
| goto end; |
| if ((r == 2) || (p >= tot)) { |
| len = p - sp; |
| break; |
| } |
| } |
| } else { |
| long tmp = len; |
| |
| while (p < ep) { |
| sp = p; |
| r = asn1_parse2(bp, &p, tmp, |
| offset + (p - *pp), depth + 1, |
| indent, dump); |
| if (r == 0) |
| goto end; |
| tmp -= p - sp; |
| } |
| } |
| } else if (xclass != 0) { |
| p += len; |
| if (BIO_write(bp, "\n", 1) <= 0) |
| goto end; |
| } else { |
| nl = 0; |
| if ((tag == V_ASN1_PRINTABLESTRING) || |
| (tag == V_ASN1_T61STRING) || |
| (tag == V_ASN1_IA5STRING) || |
| (tag == V_ASN1_VISIBLESTRING) || |
| (tag == V_ASN1_NUMERICSTRING) || |
| (tag == V_ASN1_UTF8STRING) || |
| (tag == V_ASN1_UTCTIME) || (tag == V_ASN1_GENERALIZEDTIME)) { |
| if (BIO_write(bp, ":", 1) <= 0) |
| goto end; |
| if ((len > 0) && BIO_write(bp, (const char *)p, (int)len) |
| != (int)len) |
| goto end; |
| } else if (tag == V_ASN1_OBJECT) { |
| opp = op; |
| if (d2i_ASN1_OBJECT(&o, &opp, len + hl) != NULL) { |
| if (BIO_write(bp, ":", 1) <= 0) |
| goto end; |
| i2a_ASN1_OBJECT(bp, o); |
| } else { |
| if (BIO_puts(bp, ":BAD OBJECT") <= 0) |
| goto end; |
| dump_cont = 1; |
| } |
| } else if (tag == V_ASN1_BOOLEAN) { |
| if (len != 1) { |
| if (BIO_puts(bp, ":BAD BOOLEAN") <= 0) |
| goto end; |
| dump_cont = 1; |
| } |
| if (len > 0) |
| BIO_printf(bp, ":%u", p[0]); |
| } else if (tag == V_ASN1_BMPSTRING) { |
| /* do the BMP thang */ |
| } else if (tag == V_ASN1_OCTET_STRING) { |
| int i, printable = 1; |
| |
| opp = op; |
| os = d2i_ASN1_OCTET_STRING(NULL, &opp, len + hl); |
| if (os != NULL && os->length > 0) { |
| opp = os->data; |
| /* |
| * testing whether the octet string is printable |
| */ |
| for (i = 0; i < os->length; i++) { |
| if (((opp[i] < ' ') && |
| (opp[i] != '\n') && |
| (opp[i] != '\r') && |
| (opp[i] != '\t')) || (opp[i] > '~')) { |
| printable = 0; |
| break; |
| } |
| } |
| if (printable) |
| /* printable string */ |
| { |
| if (BIO_write(bp, ":", 1) <= 0) |
| goto end; |
| if (BIO_write(bp, (const char *)opp, os->length) <= 0) |
| goto end; |
| } else if (!dump) |
| /* |
| * not printable => print octet string as hex dump |
| */ |
| { |
| if (BIO_write(bp, "[HEX DUMP]:", 11) <= 0) |
| goto end; |
| for (i = 0; i < os->length; i++) { |
| if (BIO_printf(bp, "%02X", opp[i]) <= 0) |
| goto end; |
| } |
| } else |
| /* print the normal dump */ |
| { |
| if (!nl) { |
| if (BIO_write(bp, "\n", 1) <= 0) |
| goto end; |
| } |
| if (BIO_dump_indent(bp, |
| (const char *)opp, |
| ((dump == -1 || dump > |
| os-> |
| length) ? os->length : dump), |
| dump_indent) <= 0) |
| goto end; |
| nl = 1; |
| } |
| } |
| ASN1_OCTET_STRING_free(os); |
| os = NULL; |
| } else if (tag == V_ASN1_INTEGER) { |
| int i; |
| |
| opp = op; |
| ai = d2i_ASN1_INTEGER(NULL, &opp, len + hl); |
| if (ai != NULL) { |
| if (BIO_write(bp, ":", 1) <= 0) |
| goto end; |
| if (ai->type == V_ASN1_NEG_INTEGER) |
| if (BIO_write(bp, "-", 1) <= 0) |
| goto end; |
| for (i = 0; i < ai->length; i++) { |
| if (BIO_printf(bp, "%02X", ai->data[i]) <= 0) |
| goto end; |
| } |
| if (ai->length == 0) { |
| if (BIO_write(bp, "00", 2) <= 0) |
| goto end; |
| } |
| } else { |
| if (BIO_puts(bp, ":BAD INTEGER") <= 0) |
| goto end; |
| dump_cont = 1; |
| } |
| ASN1_INTEGER_free(ai); |
| ai = NULL; |
| } else if (tag == V_ASN1_ENUMERATED) { |
| int i; |
| |
| opp = op; |
| ae = d2i_ASN1_ENUMERATED(NULL, &opp, len + hl); |
| if (ae != NULL) { |
| if (BIO_write(bp, ":", 1) <= 0) |
| goto end; |
| if (ae->type == V_ASN1_NEG_ENUMERATED) |
| if (BIO_write(bp, "-", 1) <= 0) |
| goto end; |
| for (i = 0; i < ae->length; i++) { |
| if (BIO_printf(bp, "%02X", ae->data[i]) <= 0) |
| goto end; |
| } |
| if (ae->length == 0) { |
| if (BIO_write(bp, "00", 2) <= 0) |
| goto end; |
| } |
| } else { |
| if (BIO_puts(bp, ":BAD ENUMERATED") <= 0) |
| goto end; |
| dump_cont = 1; |
| } |
| ASN1_ENUMERATED_free(ae); |
| ae = NULL; |
| } else if (len > 0 && dump) { |
| if (!nl) { |
| if (BIO_write(bp, "\n", 1) <= 0) |
| goto end; |
| } |
| if (BIO_dump_indent(bp, (const char *)p, |
| ((dump == -1 || dump > len) ? len : dump), |
| dump_indent) <= 0) |
| goto end; |
| nl = 1; |
| } |
| if (dump_cont) { |
| int i; |
| const unsigned char *tmp = op + hl; |
| if (BIO_puts(bp, ":[") <= 0) |
| goto end; |
| for (i = 0; i < len; i++) { |
| if (BIO_printf(bp, "%02X", tmp[i]) <= 0) |
| goto end; |
| } |
| if (BIO_puts(bp, "]") <= 0) |
| goto end; |
| dump_cont = 0; |
| } |
| |
| if (!nl) { |
| if (BIO_write(bp, "\n", 1) <= 0) |
| goto end; |
| } |
| p += len; |
| if ((tag == V_ASN1_EOC) && (xclass == 0)) { |
| ret = 2; /* End of sequence */ |
| goto end; |
| } |
| } |
| length -= len; |
| } |
| ret = 1; |
| end: |
| ASN1_OBJECT_free(o); |
| ASN1_OCTET_STRING_free(os); |
| ASN1_INTEGER_free(ai); |
| ASN1_ENUMERATED_free(ae); |
| *pp = p; |
| return ret; |
| } |
| |
| const char *ASN1_tag2str(int tag) |
| { |
| static const char *const tag2str[] = { |
| /* 0-4 */ |
| "EOC", "BOOLEAN", "INTEGER", "BIT STRING", "OCTET STRING", |
| /* 5-9 */ |
| "NULL", "OBJECT", "OBJECT DESCRIPTOR", "EXTERNAL", "REAL", |
| /* 10-13 */ |
| "ENUMERATED", "<ASN1 11>", "UTF8STRING", "<ASN1 13>", |
| /* 15-17 */ |
| "<ASN1 14>", "<ASN1 15>", "SEQUENCE", "SET", |
| /* 18-20 */ |
| "NUMERICSTRING", "PRINTABLESTRING", "T61STRING", |
| /* 21-24 */ |
| "VIDEOTEXSTRING", "IA5STRING", "UTCTIME", "GENERALIZEDTIME", |
| /* 25-27 */ |
| "GRAPHICSTRING", "VISIBLESTRING", "GENERALSTRING", |
| /* 28-30 */ |
| "UNIVERSALSTRING", "<ASN1 29>", "BMPSTRING" |
| }; |
| |
| if ((tag == V_ASN1_NEG_INTEGER) || (tag == V_ASN1_NEG_ENUMERATED)) |
| tag &= ~0x100; |
| |
| if (tag < 0 || tag > 30) |
| return "(unknown)"; |
| return tag2str[tag]; |
| } |
