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        !            23: .TH mk-ca-bundle 1 "24 Oct 2016" "version 1.27" "mk-ca-bundle manual"
        !            24: .SH NAME
        !            25: mk-ca-bundle \- convert mozilla's certdata.txt to PEM format
        !            26: .SH SYNOPSIS
        !            27: mk-ca-bundle [options]
        !            28: .I [outputfile]
        !            29: .SH DESCRIPTION
        !            30: The mk-ca-bundle tool downloads the certdata.txt file from Mozilla's source
        !            31: tree over HTTPS, then parses certdata.txt and extracts certificates into PEM
        !            32: format. By default, only CA root certificates trusted to issue SSL server
        !            33: authentication certificates are extracted. These are then processed with the
        !            34: OpenSSL commandline tool to produce the final ca-bundle file.
        !            35: 
        !            36: The default \fIoutputfile\fP name is \fBca-bundle.crt\fP. By setting it to '-'
        !            37: (a single dash) you will get the output sent to STDOUT instead of a file.
        !            38: 
        !            39: The PEM format this scripts uses for output makes the result readily available
        !            40: for use by just about all OpenSSL or GnuTLS powered applications, such as
        !            41: curl, wget and more.
        !            42: .SH OPTIONS
        !            43: The following options are supported:
        !            44: .IP -b
        !            45: backup an existing version of \fIoutputfilename\fP
        !            46: .IP "-d [name]"
        !            47: specify which Mozilla tree to pull certdata.txt from (or a custom URL). Valid
        !            48: names are: aurora, beta, central, mozilla, nss, release (default). They are
        !            49: shortcuts for which source tree to get the cert data from.
        !            50: .IP -f
        !            51: force rebuild even if certdata.txt is current (Added in version 1.17)
        !            52: .IP -i
        !            53: print version info about used modules
        !            54: .IP -k
        !            55: Allow insecure data transfer. By default (since 1.27) this command will fail
        !            56: if the HTTPS transfer fails. This overrides that decision (and opens for
        !            57: man-in-the-middle attacks).
        !            58: .IP -l
        !            59: print license info about certdata.txt
        !            60: .IP -m
        !            61: (Added in 1.26) Include meta data comments in the output. The meta data is
        !            62: specific information about each certificate that is stored in the original
        !            63: file as comments and using this option will make those comments get passed on
        !            64: to the output file. The meta data is not parsed in any way by mk-ca-bundle.
        !            65: .IP -n
        !            66: no download of certdata.txt (to use existing)
        !            67: .IP "-p [purposes]:[levels]"
        !            68: list of Mozilla trust purposes and levels for certificates to include in output.
        !            69: Takes the form of a comma separated list of purposes, a colon, and a comma
        !            70: separated list of levels. The default is to include all certificates trusted
        !            71: to issue SSL Server certificates (SERVER_AUTH:TRUSTED_DELEGATOR).
        !            72: 
        !            73: (Added in version 1.21, Perl only)
        !            74: 
        !            75: Valid purposes are:
        !            76: .RS
        !            77: ALL, DIGITAL_SIGNATURE, NON_REPUDIATION, KEY_ENCIPHERMENT,
        !            78: DATA_ENCIPHERMENT, KEY_AGREEMENT, KEY_CERT_SIGN, CRL_SIGN,
        !            79: SERVER_AUTH (default), CLIENT_AUTH, CODE_SIGNING, EMAIL_PROTECTION,
        !            80: IPSEC_END_SYSTEM, IPSEC_TUNNEL, IPSEC_USER, TIME_STAMPING, STEP_UP_APPROVED
        !            81: .RE
        !            82: .IP
        !            83: Valid trust levels are:
        !            84: .RS
        !            85: ALL, TRUSTED_DELEGATOR (default), NOT_TRUSTED, MUST_VERIFY_TRUST, TRUSTED
        !            86: .RE
        !            87: .IP -q
        !            88: be really quiet (no progress output at all)
        !            89: .IP -t
        !            90: include plain text listing of certificates
        !            91: .IP "-s [algorithms]"
        !            92: comma separated list of signature algorithms with which to hash/fingerprint
        !            93: each certificate and output when run in plain text mode.
        !            94: 
        !            95: (Added in version 1.21, Perl only)
        !            96: 
        !            97: Valid algorithms are:
        !            98: .RS
        !            99: ALL, NONE, MD5 (default), SHA1, SHA256, SHA384, SHA512
        !           100: .RE
        !           101: .IP -u
        !           102: unlink (remove) certdata.txt after processing
        !           103: .IP -v
        !           104: be verbose and print out processed CAs
        !           105: .SH EXIT STATUS
        !           106: Returns 0 on success. Returns 1 if it fails to download data.
        !           107: .SH CERTDATA FORMAT
        !           108: The file format used by Mozilla for this trust information seems to be documented here:
        !           109: .nf
        !           110: https://p11-glue.freedesktop.org/doc/storing-trust-policy/storing-trust-existing.html
        !           111: .fi
        !           112: .SH SEE ALSO
        !           113: .BR curl (1)
        !           114: .SH HISTORY
        !           115: \fBmk-ca-bundle\fP is a command line tool that is shipped as part of every
        !           116: curl and libcurl release (see https://curl.haxx.se/). It was originally based
        !           117: on the parse-certs script written by Roland Krikava and was later much
        !           118: improved by Guenter Knauf.  This manual page was initially written by Jan
        !           119: Schaumann \&<jschauma@netmeister.org>.