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cryb-to/lib/oath/cryb_oath_key_from_uri.c

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initial code drop
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/*-
All property names and values may be percent-encoded. If the key length is not a multiple of 40 bits, its base32 representation may be padded, and that padding will be encoded. We already decoded the label (which may contain spaces and other unsafe characters), but not the key. For the sake of simplicity and robustness, we now decode the name and value of every property. This corresponds to OpenPAM r886.
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* Copyright (c) 2013-2016 The University of Oslo
* Copyright (c) 2016-2017 Dag-Erling Smørgrav
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* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote
* products derived from this software without specific prior written
* permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include "cryb/impl.h"
#include <sys/types.h>
#include <inttypes.h>
#include <string.h>
#include <cryb/rfc3986.h>
#include <cryb/rfc4648.h>
#include <cryb/strlcmp.h>
#include <cryb/oath.h>
/*
* OATH
*
* Creates an OATH key from a Google otpauth URI
*/
struct oath_key *
oath_key_from_uri(const char *uri)
{
All property names and values may be percent-encoded. If the key length is not a multiple of 40 bits, its base32 representation may be padded, and that padding will be encoded. We already decoded the label (which may contain spaces and other unsafe characters), but not the key. For the sake of simplicity and robustness, we now decode the name and value of every property. This corresponds to OpenPAM r886.
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char name[64], value[256];
size_t namelen, valuelen;
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struct oath_key *key;
const char *p, *q, *r;
uintmax_t n;
char *e;
if ((key = oath_key_alloc()) == NULL)
return (NULL);
/* check method */
p = uri;
if (strlcmp("otpauth://", p, 10) != 0)
goto invalid;
p += 10;
/* check mode (hotp = event, totp = time-sync) */
if ((q = strchr(p, '/')) == NULL)
goto invalid;
if (strlcmp("hotp", p, q - p) == 0) {
key->mode = om_hotp;
} else if (strlcmp("totp", p, q - p) == 0) {
key->mode = om_totp;
} else {
goto invalid;
}
p = q + 1;
/* extract label */
if ((q = strchr(p, '?')) == NULL)
goto invalid;
key->labellen = sizeof key->label;
if (percent_decode(p, q - p, key->label, &key->labellen) != 0)
goto invalid;
p = q + 1;
/* extract parameters */
key->counter = UINT64_MAX;
key->lastused = UINT64_MAX;
while (*p != '\0') {
All property names and values may be percent-encoded. If the key length is not a multiple of 40 bits, its base32 representation may be padded, and that padding will be encoded. We already decoded the label (which may contain spaces and other unsafe characters), but not the key. For the sake of simplicity and robustness, we now decode the name and value of every property. This corresponds to OpenPAM r886.
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/* locate name-value separator */
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if ((q = strchr(p, '=')) == NULL)
goto invalid;
q = q + 1;
All property names and values may be percent-encoded. If the key length is not a multiple of 40 bits, its base32 representation may be padded, and that padding will be encoded. We already decoded the label (which may contain spaces and other unsafe characters), but not the key. For the sake of simplicity and robustness, we now decode the name and value of every property. This corresponds to OpenPAM r886.
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/* locate end of value */
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if ((r = strchr(p, '&')) == NULL)
r = strchr(p, '\0');
if (r < q)
/* & before = */
goto invalid;
All property names and values may be percent-encoded. If the key length is not a multiple of 40 bits, its base32 representation may be padded, and that padding will be encoded. We already decoded the label (which may contain spaces and other unsafe characters), but not the key. For the sake of simplicity and robustness, we now decode the name and value of every property. This corresponds to OpenPAM r886.
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/* decode name and value*/
namelen = sizeof name;
valuelen = sizeof value;
if (percent_decode(p, q - p - 1, name, &namelen) != 0 ||
percent_decode(q, r - q, value, &valuelen) != 0)
goto invalid;
if (strcmp("secret", name) == 0) {
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if (key->keylen != 0)
/* dupe */
goto invalid;
key->keylen = sizeof key->key;
All property names and values may be percent-encoded. If the key length is not a multiple of 40 bits, its base32 representation may be padded, and that padding will be encoded. We already decoded the label (which may contain spaces and other unsafe characters), but not the key. For the sake of simplicity and robustness, we now decode the name and value of every property. This corresponds to OpenPAM r886.
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if (base32_decode(value, valuelen, key->key, &key->keylen) != 0)
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goto invalid;
All property names and values may be percent-encoded. If the key length is not a multiple of 40 bits, its base32 representation may be padded, and that padding will be encoded. We already decoded the label (which may contain spaces and other unsafe characters), but not the key. For the sake of simplicity and robustness, we now decode the name and value of every property. This corresponds to OpenPAM r886.
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} else if (strcmp("algorithm", name) == 0) {
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if (key->hash != oh_undef)
/* dupe */
goto invalid;
All property names and values may be percent-encoded. If the key length is not a multiple of 40 bits, its base32 representation may be padded, and that padding will be encoded. We already decoded the label (which may contain spaces and other unsafe characters), but not the key. For the sake of simplicity and robustness, we now decode the name and value of every property. This corresponds to OpenPAM r886.
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if (strcmp("SHA1", value) == 0)
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key->hash = oh_sha1;
All property names and values may be percent-encoded. If the key length is not a multiple of 40 bits, its base32 representation may be padded, and that padding will be encoded. We already decoded the label (which may contain spaces and other unsafe characters), but not the key. For the sake of simplicity and robustness, we now decode the name and value of every property. This corresponds to OpenPAM r886.
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else if (strcmp("SHA256", value) == 0)
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key->hash = oh_sha256;
All property names and values may be percent-encoded. If the key length is not a multiple of 40 bits, its base32 representation may be padded, and that padding will be encoded. We already decoded the label (which may contain spaces and other unsafe characters), but not the key. For the sake of simplicity and robustness, we now decode the name and value of every property. This corresponds to OpenPAM r886.
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else if (strcmp("SHA512", value) == 0)
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key->hash = oh_sha512;
All property names and values may be percent-encoded. If the key length is not a multiple of 40 bits, its base32 representation may be padded, and that padding will be encoded. We already decoded the label (which may contain spaces and other unsafe characters), but not the key. For the sake of simplicity and robustness, we now decode the name and value of every property. This corresponds to OpenPAM r886.
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else if (strcmp("MD5", value) == 0)
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key->hash = oh_md5;
else
goto invalid;
All property names and values may be percent-encoded. If the key length is not a multiple of 40 bits, its base32 representation may be padded, and that padding will be encoded. We already decoded the label (which may contain spaces and other unsafe characters), but not the key. For the sake of simplicity and robustness, we now decode the name and value of every property. This corresponds to OpenPAM r886.
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} else if (strcmp("digits", name) == 0) {
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if (key->digits != 0)
/* dupe */
goto invalid;
/* only 6 or 8 */
All property names and values may be percent-encoded. If the key length is not a multiple of 40 bits, its base32 representation may be padded, and that padding will be encoded. We already decoded the label (which may contain spaces and other unsafe characters), but not the key. For the sake of simplicity and robustness, we now decode the name and value of every property. This corresponds to OpenPAM r886.
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if (valuelen != 1 || (*value != '6' && *value != '8'))
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goto invalid;
key->digits = *q - '0';
All property names and values may be percent-encoded. If the key length is not a multiple of 40 bits, its base32 representation may be padded, and that padding will be encoded. We already decoded the label (which may contain spaces and other unsafe characters), but not the key. For the sake of simplicity and robustness, we now decode the name and value of every property. This corresponds to OpenPAM r886.
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} else if (strcmp("counter", name) == 0) {
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if (key->counter != UINT64_MAX)
/* dupe */
goto invalid;
All property names and values may be percent-encoded. If the key length is not a multiple of 40 bits, its base32 representation may be padded, and that padding will be encoded. We already decoded the label (which may contain spaces and other unsafe characters), but not the key. For the sake of simplicity and robustness, we now decode the name and value of every property. This corresponds to OpenPAM r886.
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n = strtoumax(value, &e, 10);
if (e == value || *e != '\0' || n >= UINT64_MAX)
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goto invalid;
key->counter = (uint64_t)n;
All property names and values may be percent-encoded. If the key length is not a multiple of 40 bits, its base32 representation may be padded, and that padding will be encoded. We already decoded the label (which may contain spaces and other unsafe characters), but not the key. For the sake of simplicity and robustness, we now decode the name and value of every property. This corresponds to OpenPAM r886.
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} else if (strcmp("lastused", name) == 0) {
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if (key->lastused != UINT64_MAX)
/* dupe */
goto invalid;
All property names and values may be percent-encoded. If the key length is not a multiple of 40 bits, its base32 representation may be padded, and that padding will be encoded. We already decoded the label (which may contain spaces and other unsafe characters), but not the key. For the sake of simplicity and robustness, we now decode the name and value of every property. This corresponds to OpenPAM r886.
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n = strtoumax(value, &e, 10);
if (e == value || *e != '\0' || n >= UINT64_MAX)
initial code drop
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goto invalid;
key->lastused = (uint64_t)n;
All property names and values may be percent-encoded. If the key length is not a multiple of 40 bits, its base32 representation may be padded, and that padding will be encoded. We already decoded the label (which may contain spaces and other unsafe characters), but not the key. For the sake of simplicity and robustness, we now decode the name and value of every property. This corresponds to OpenPAM r886.
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} else if (strcmp("period", name) == 0) {
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if (key->timestep != 0)
/* dupe */
goto invalid;
All property names and values may be percent-encoded. If the key length is not a multiple of 40 bits, its base32 representation may be padded, and that padding will be encoded. We already decoded the label (which may contain spaces and other unsafe characters), but not the key. For the sake of simplicity and robustness, we now decode the name and value of every property. This corresponds to OpenPAM r886.
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n = strtoumax(value, &e, 10);
if (e == value || *e != '\0' || n > OATH_MAX_TIMESTEP)
initial code drop
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goto invalid;
key->timestep = n;
All property names and values may be percent-encoded. If the key length is not a multiple of 40 bits, its base32 representation may be padded, and that padding will be encoded. We already decoded the label (which may contain spaces and other unsafe characters), but not the key. For the sake of simplicity and robustness, we now decode the name and value of every property. This corresponds to OpenPAM r886.
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} else if (strcmp("issuer", name) == 0) {
initial code drop
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// noop for now
} else {
goto invalid;
}
/* final parameter? */
if (*r == '\0')
break;
/* skip & and continue */
p = r + 1;
}
/* sanity checks and default values */
if (key->mode == om_hotp) {
if (key->counter == UINT64_MAX)
key->counter = 0;
if (key->timestep != 0)
goto invalid;
if (key->lastused != UINT64_MAX)
goto invalid;
} else if (key->mode == om_totp) {
if (key->counter != UINT64_MAX)
goto invalid;
if (key->timestep == 0)
key->timestep = OATH_DEF_TIMESTEP;
if (key->lastused == UINT64_MAX)
key->lastused = 0;
} else {
/* unreachable */
oath_key_free(key);
return (NULL);
}
if (key->hash == oh_undef)
key->hash = oh_sha1;
if (key->digits == 0)
key->digits = 6;
if (key->keylen == 0)
goto invalid;
return (key);
invalid:
// openpam_log(PAM_LOG_NOTICE, "invalid OATH URI: %s", uri);
oath_key_free(key);
return (NULL);
}
/**
* The =oath_key_from_uri function parses a Google otpauth URI into a key
* structure.
*
* The =uri parameter points to a NUL-terminated string containing the
* URI.
*
* Keys created with =oath_key_from_uri must be freed using
* =oath_key_free.
*
* >oath_key_alloc
* >oath_key_free
* >oath_key_to_uri
*
* REFERENCES
*
* https://code.google.com/p/google-authenticator/wiki/KeyUriFormat
*
* AUTHOR UIO
*/
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