298 lines
9.5 KiB
Groff
298 lines
9.5 KiB
Groff
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.\" ========================================================================
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.\"
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.IX Title "ASN1PARSE 1"
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.TH ASN1PARSE 1 "2014-01-06" "1.0.1f" "OpenSSL"
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.\" For nroff, turn off justification. Always turn off hyphenation; it makes
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.\" way too many mistakes in technical documents.
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.if n .ad l
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.nh
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.SH "NAME"
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asn1parse \- ASN.1 parsing tool
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.SH "SYNOPSIS"
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.IX Header "SYNOPSIS"
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\&\fBopenssl\fR \fBasn1parse\fR
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[\fB\-inform PEM|DER\fR]
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[\fB\-in filename\fR]
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[\fB\-out filename\fR]
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[\fB\-noout\fR]
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[\fB\-offset number\fR]
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[\fB\-length number\fR]
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[\fB\-i\fR]
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[\fB\-oid filename\fR]
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[\fB\-strparse offset\fR]
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[\fB\-genstr string\fR]
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[\fB\-genconf file\fR]
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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The \fBasn1parse\fR command is a diagnostic utility that can parse \s-1ASN\s0.1
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structures. It can also be used to extract data from \s-1ASN\s0.1 formatted data.
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.SH "OPTIONS"
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.IX Header "OPTIONS"
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.IP "\fB\-inform\fR \fBDER|PEM\fR" 4
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.IX Item "-inform DER|PEM"
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the input format. \fB\s-1DER\s0\fR is binary format and \fB\s-1PEM\s0\fR (the default) is base64
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encoded.
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.IP "\fB\-in filename\fR" 4
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.IX Item "-in filename"
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the input file, default is standard input
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.IP "\fB\-out filename\fR" 4
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.IX Item "-out filename"
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output file to place the \s-1DER\s0 encoded data into. If this
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option is not present then no data will be output. This is most useful when
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combined with the \fB\-strparse\fR option.
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.IP "\fB\-noout\fR" 4
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.IX Item "-noout"
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don't output the parsed version of the input file.
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.IP "\fB\-offset number\fR" 4
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.IX Item "-offset number"
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starting offset to begin parsing, default is start of file.
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.IP "\fB\-length number\fR" 4
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.IX Item "-length number"
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number of bytes to parse, default is until end of file.
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.IP "\fB\-i\fR" 4
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.IX Item "-i"
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indents the output according to the \*(L"depth\*(R" of the structures.
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.IP "\fB\-oid filename\fR" 4
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.IX Item "-oid filename"
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a file containing additional \s-1OBJECT\s0 IDENTIFIERs (OIDs). The format of this
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file is described in the \s-1NOTES\s0 section below.
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.IP "\fB\-strparse offset\fR" 4
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.IX Item "-strparse offset"
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parse the contents octets of the \s-1ASN\s0.1 object starting at \fBoffset\fR. This
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option can be used multiple times to \*(L"drill down\*(R" into a nested structure.
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.IP "\fB\-genstr string\fR, \fB\-genconf file\fR" 4
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.IX Item "-genstr string, -genconf file"
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generate encoded data based on \fBstring\fR, \fBfile\fR or both using
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\&\fIASN1_generate_nconf\fR\|(3) format. If \fBfile\fR only is
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present then the string is obtained from the default section using the name
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\&\fBasn1\fR. The encoded data is passed through the \s-1ASN1\s0 parser and printed out as
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though it came from a file, the contents can thus be examined and written to a
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file using the \fBout\fR option.
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.SS "\s-1OUTPUT\s0"
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.IX Subsection "OUTPUT"
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The output will typically contain lines like this:
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.PP
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.Vb 1
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\& 0:d=0 hl=4 l= 681 cons: SEQUENCE
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.Ve
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.PP
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\&.....
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.PP
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.Vb 10
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\& 229:d=3 hl=3 l= 141 prim: BIT STRING
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\& 373:d=2 hl=3 l= 162 cons: cont [ 3 ]
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\& 376:d=3 hl=3 l= 159 cons: SEQUENCE
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\& 379:d=4 hl=2 l= 29 cons: SEQUENCE
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\& 381:d=5 hl=2 l= 3 prim: OBJECT :X509v3 Subject Key Identifier
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\& 386:d=5 hl=2 l= 22 prim: OCTET STRING
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\& 410:d=4 hl=2 l= 112 cons: SEQUENCE
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\& 412:d=5 hl=2 l= 3 prim: OBJECT :X509v3 Authority Key Identifier
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\& 417:d=5 hl=2 l= 105 prim: OCTET STRING
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\& 524:d=4 hl=2 l= 12 cons: SEQUENCE
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.Ve
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.PP
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\&.....
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.PP
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This example is part of a self signed certificate. Each line starts with the
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offset in decimal. \fBd=XX\fR specifies the current depth. The depth is increased
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within the scope of any \s-1SET\s0 or \s-1SEQUENCE\s0. \fBhl=XX\fR gives the header length
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(tag and length octets) of the current type. \fBl=XX\fR gives the length of
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the contents octets.
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.PP
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The \fB\-i\fR option can be used to make the output more readable.
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.PP
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Some knowledge of the \s-1ASN\s0.1 structure is needed to interpret the output.
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.PP
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In this example the \s-1BIT\s0 \s-1STRING\s0 at offset 229 is the certificate public key.
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The contents octets of this will contain the public key information. This can
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be examined using the option \fB\-strparse 229\fR to yield:
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.PP
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.Vb 3
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\& 0:d=0 hl=3 l= 137 cons: SEQUENCE
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\& 3:d=1 hl=3 l= 129 prim: INTEGER :E5D21E1F5C8D208EA7A2166C7FAF9F6BDF2059669C60876DDB70840F1A5AAFA59699FE471F379F1DD6A487E7D5409AB6A88D4A9746E24B91D8CF55DB3521015460C8EDE44EE8A4189F7A7BE77D6CD3A9AF2696F486855CF58BF0EDF2B4068058C7A947F52548DDF7E15E96B385F86422BEA9064A3EE9E1158A56E4A6F47E5897
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\& 135:d=1 hl=2 l= 3 prim: INTEGER :010001
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.Ve
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.SH "NOTES"
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.IX Header "NOTES"
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If an \s-1OID\s0 is not part of OpenSSL's internal table it will be represented in
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numerical form (for example 1.2.3.4). The file passed to the \fB\-oid\fR option
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allows additional OIDs to be included. Each line consists of three columns,
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the first column is the \s-1OID\s0 in numerical format and should be followed by white
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space. The second column is the \*(L"short name\*(R" which is a single word followed
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by white space. The final column is the rest of the line and is the
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\&\*(L"long name\*(R". \fBasn1parse\fR displays the long name. Example:
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.PP
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\&\f(CW\*(C`1.2.3.4 shortName A long name\*(C'\fR
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.SH "EXAMPLES"
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.IX Header "EXAMPLES"
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Parse a file:
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.PP
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.Vb 1
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\& openssl asn1parse \-in file.pem
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.Ve
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.PP
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Parse a \s-1DER\s0 file:
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.PP
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.Vb 1
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\& openssl asn1parse \-inform DER \-in file.der
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.Ve
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.PP
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Generate a simple UTF8String:
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.PP
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.Vb 1
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\& openssl asn1parse \-genstr \*(AqUTF8:Hello World\*(Aq
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.Ve
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.PP
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Generate and write out a UTF8String, don't print parsed output:
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.PP
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.Vb 1
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\& openssl asn1parse \-genstr \*(AqUTF8:Hello World\*(Aq \-noout \-out utf8.der
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.Ve
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.PP
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Generate using a config file:
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.PP
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.Vb 1
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\& openssl asn1parse \-genconf asn1.cnf \-noout \-out asn1.der
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.Ve
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.PP
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Example config file:
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.PP
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.Vb 1
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\& asn1=SEQUENCE:seq_sect
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\&
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\& [seq_sect]
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\&
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\& field1=BOOL:TRUE
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\& field2=EXP:0, UTF8:some random string
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.Ve
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.SH "BUGS"
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.IX Header "BUGS"
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There should be options to change the format of output lines. The output of some
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\&\s-1ASN\s0.1 types is not well handled (if at all).
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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\&\fIASN1_generate_nconf\fR\|(3)
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