Added -strictpem parameter to enable processing of PEM files with data prior to the...
authorMatt Caswell <matt@openssl.org>
Mon, 26 May 2014 16:16:43 +0000 (17:16 +0100)
committerMatt Caswell <matt@openssl.org>
Mon, 26 May 2014 16:24:11 +0000 (17:24 +0100)
apps/asn1pars.c
doc/apps/asn1parse.pod

index 0d66070..dcdf628 100644 (file)
@@ -80,6 +80,9 @@
 #undef PROG
 #define PROG   asn1parse_main
 
+/* Minimum buffer size to be used */
+#define MIN_BUFFER     256
+
 int MAIN(int, char **);
 
 static int do_generate(BIO *bio, char *genstr, char *genconf, BUF_MEM *buf);
@@ -90,7 +93,7 @@ int MAIN(int argc, char **argv)
        unsigned int length=0;
        long num,tmplen;
        BIO *in=NULL,*out=NULL,*b64=NULL, *derout = NULL;
-       int informat,indent=0, noout = 0, dump = 0;
+       int informat,indent=0, noout = 0, dump = 0, strictpem = 0;
        char *infile=NULL,*str=NULL,*prog,*oidfile=NULL, *derfile=NULL;
        char *genstr=NULL, *genconf=NULL;
        unsigned char *tmpbuf;
@@ -181,6 +184,11 @@ int MAIN(int argc, char **argv)
                        if (--argc < 1) goto bad;
                        genconf= *(++argv);
                        }
+               else if (strcmp(*argv,"-strictpem") == 0)
+                       {
+                       strictpem = 1;
+                       informat = FORMAT_PEM;
+                       }
                else
                        {
                        BIO_printf(bio_err,"unknown option %s\n",*argv);
@@ -211,6 +219,8 @@ bad:
                BIO_printf(bio_err,"               ASN1 blob wrappings\n");
                BIO_printf(bio_err," -genstr str   string to generate ASN1 structure from\n");
                BIO_printf(bio_err," -genconf file file to generate ASN1 structure from\n");
+               BIO_printf(bio_err," -strictpem    do not attempt base64 decode outside PEM markers (-inform \n");
+               BIO_printf(bio_err,"               will be ignored)\n");
                goto end;
                }
 
@@ -262,7 +272,7 @@ bad:
        }
 
        if ((buf=BUF_MEM_new()) == NULL) goto end;
-       if (!BUF_MEM_grow(buf,BUFSIZ*8)) goto end; /* Pre-allocate :-) */
+       if (!BUF_MEM_grow(buf,(BUFSIZ*8)<MIN_BUFFER?MIN_BUFFER:(BUFSIZ*8))) goto end; /* Pre-allocate :-) */
 
        if (genstr || genconf)
                {
@@ -281,6 +291,38 @@ bad:
                        {
                        BIO *tmp;
 
+                       if(strictpem)
+                               {
+                               for (;;)
+                                       {
+                                       /* Read a line */
+                                       i=BIO_gets(in,buf->data,MIN_BUFFER-1);
+
+                                       if (i <= 0)
+                                               {
+                                               BIO_printf(bio_err, "Error: Cannot find start line\n");
+                                               goto end;
+                                               }
+
+                                       /* Strip trailing spaces etc */
+                                       do
+                                               i--;
+                                       while ((i >= 0) && (buf->data[i]  <= ' '));
+
+                                       buf->data[++i]='\0';
+
+                                       /* Check if we have a PEM BEGIN marker */
+                                       if (strncmp(buf->data,"-----BEGIN ",11) == 0)
+                                               {
+                                               if (strncmp(&(buf->data[i-5]),"-----",5) != 0)
+                                                       continue;
+                                               break;
+                                               }
+                                       }
+                               }
+
+
+
                        if ((b64=BIO_new(BIO_f_base64())) == NULL)
                                goto end;
                        BIO_push(b64,in);
index f7bb926..577d997 100644 (file)
@@ -18,6 +18,7 @@ B<openssl> B<asn1parse>
 [B<-strparse offset>]
 [B<-genstr string>]
 [B<-genconf file>]
+[B<-strictpem>]
 
 =head1 DESCRIPTION
 
@@ -78,6 +79,13 @@ B<asn1>. The encoded data is passed through the ASN1 parser and printed out as
 though it came from a file, the contents can thus be examined and written to a
 file using the B<out> option. 
 
+=item B<-strictpem>
+
+If this option is used then B<-inform> will be ignored. Without this option any
+data in a PEM format input file will be treated as base64 encoded and 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 in a PEM file.
+
 =back
 
 =head2 OUTPUT
@@ -88,7 +96,7 @@ The output will typically contain lines like this:
 
 .....
 
-  229:d=3  hl=3 l= 141 prim: BIT STRING        
+  229:d=3  hl=3 l= 141 prim: BIT STRING
   373:d=2  hl=3 l= 162 cons: cont [ 3 ]        
   376:d=3  hl=3 l= 159 cons: SEQUENCE          
   379:d=4  hl=2 l=  29 cons: SEQUENCE