From 5fb1005987d3d0bc749d935e5af4a69323824b48 Mon Sep 17 00:00:00 2001
From: "Dr. Stephen Henson" <steve@openssl.org>
Date: Tue, 27 Sep 2016 22:25:08 +0100
Subject: [PATCH] Add -item option to asn1parse

Reviewed-by: Rich Salz <rsalz@openssl.org>
---
 apps/asn1pars.c        | 45 ++++++++++++++++++++++++++++++++++++------
 doc/apps/asn1parse.pod |  6 ++++++
 2 files changed, 45 insertions(+), 6 deletions(-)

diff --git a/apps/asn1pars.c b/apps/asn1pars.c
index 1ac261c762..0bc48e3f5e 100644
--- a/apps/asn1pars.c
+++ b/apps/asn1pars.c
@@ -20,12 +20,14 @@
 #include <openssl/evp.h>
 #include <openssl/x509.h>
 #include <openssl/pem.h>
+#include <openssl/asn1t.h>
 
 typedef enum OPTION_choice {
     OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
     OPT_INFORM, OPT_IN, OPT_OUT, OPT_INDENT, OPT_NOOUT,
     OPT_OID, OPT_OFFSET, OPT_LENGTH, OPT_DUMP, OPT_DLIMIT,
-    OPT_STRPARSE, OPT_GENSTR, OPT_GENCONF, OPT_STRICTPEM
+    OPT_STRPARSE, OPT_GENSTR, OPT_GENCONF, OPT_STRICTPEM,
+    OPT_ITEM
 } OPTION_CHOICE;
 
 OPTIONS asn1parse_options[] = {
@@ -49,6 +51,7 @@ OPTIONS asn1parse_options[] = {
     {OPT_MORE_STR, 0, 0, "(-inform  will be ignored)"},
     {"strictpem", OPT_STRICTPEM, 0,
      "do not attempt base64 decode outside PEM markers"},
+    {"item", OPT_ITEM, 's', "item to parse and print"},
     {NULL}
 };
 
@@ -71,6 +74,7 @@ int asn1parse_main(int argc, char **argv)
     unsigned char *tmpbuf;
     unsigned int length = 0;
     OPTION_CHOICE o;
+    const ASN1_ITEM *it = NULL;
 
     prog = opt_init(argc, argv, asn1parse_options);
 
@@ -134,6 +138,22 @@ int asn1parse_main(int argc, char **argv)
             strictpem = 1;
             informat = FORMAT_PEM;
             break;
+        case OPT_ITEM:
+            it = ASN1_ITEM_lookup(opt_arg());
+            if (it == NULL) {
+                size_t tmp;
+
+                BIO_printf(bio_err, "Unknown item name %s\n", opt_arg());
+                BIO_puts(bio_err, "Supported types:\n");
+                for (tmp = 0;; tmp++) {
+                    it = ASN1_ITEM_get(tmp);
+                    if (it == NULL)
+                        break;
+                    BIO_printf(bio_err, "    %s\n", it->sname);
+                }
+                goto end;
+            }
+            break;
         }
     }
     argc = opt_num_rest();
@@ -260,11 +280,24 @@ int asn1parse_main(int argc, char **argv)
             goto end;
         }
     }
-    if (!noout &&
-        !ASN1_parse_dump(bio_out, &(str[offset]), length,
-                         indent, dump)) {
-        ERR_print_errors(bio_err);
-        goto end;
+    if (!noout) {
+        const unsigned char *p = str + offset;
+
+        if (it != NULL) {
+            ASN1_VALUE *value = ASN1_item_d2i(NULL, &p, length, it);
+            if (value == NULL) {
+                BIO_printf(bio_err, "Error parsing item %s\n", it->sname);
+                ERR_print_errors(bio_err);
+                goto end;
+            }
+            ASN1_item_print(bio_out, value, 0, it, NULL);
+            ASN1_item_free(value, it);
+        } else {
+            if (!ASN1_parse_dump(bio_out, p, length, indent, dump)) {
+                ERR_print_errors(bio_err);
+                goto end;
+            }
+        }
     }
     ret = 0;
  end:
diff --git a/doc/apps/asn1parse.pod b/doc/apps/asn1parse.pod
index 10a5aba51d..ee09a83cf7 100644
--- a/doc/apps/asn1parse.pod
+++ b/doc/apps/asn1parse.pod
@@ -22,6 +22,7 @@ B<openssl> B<asn1parse>
 [B<-genstr string>]
 [B<-genconf file>]
 [B<-strictpem>]
+[B<-item name>]
 
 =head1 DESCRIPTION
 
@@ -102,6 +103,11 @@ processed whether it has the normal PEM BEGIN and END markers or not. This
 option will ignore any data prior to the start of the BEGIN marker, or after an
 END marker in a PEM file.
 
+=item B<-item name>
+
+attempt to decode and print the data as B<ASN1_ITEM name>. This can be used to
+print out the fields of any supported ASN.1 structure if the type is known.
+
 =back
 
 =head2 Output
-- 
2.25.1