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rpmpgp.c
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/** \ingroup rpmio signature
* \file rpmio/rpmpgp.c
* Routines to handle RFC-2440 detached signatures.
*/
#include "system.h"
#include <time.h>
#include <netinet/in.h>
#include <rpm/rpmstring.h>
#include <rpm/rpmlog.h>
#include <rpm/rpmbase64.h>
#include "rpmio/digest.h"
#include "rpmio/rpmio_internal.h" /* XXX rpmioSlurp */
#include "debug.h"
static int _print = 0;
/** \ingroup rpmio
* Values parsed from OpenPGP signature/pubkey packet(s).
*/
struct pgpDigParams_s {
char * userid;
uint8_t * hash;
uint8_t tag;
uint8_t key_flags; /*!< key usage flags */
uint8_t version; /*!< version number. */
uint32_t time; /*!< key/signature creation time. */
uint8_t pubkey_algo; /*!< public key algorithm. */
uint8_t hash_algo;
uint8_t sigtype;
uint32_t hashlen;
uint8_t signhash16[2];
pgpKeyID_t signid;
uint8_t saved; /*!< Various flags. `PGPDIG_SAVED_*` are never reset.
* `PGPDIG_SIG_HAS_*` are reset for each signature. */
#define PGPDIG_SAVED_TIME (1 << 0)
#define PGPDIG_SAVED_ID (1 << 1)
#define PGPDIG_SIG_HAS_CREATION_TIME (1 << 2)
#define PGPDIG_SIG_HAS_KEY_FLAGS (1 << 3)
pgpDigAlg alg;
};
/** \ingroup rpmio
* Container for values parsed from an OpenPGP signature and public key.
*/
struct pgpDig_s {
struct pgpDigParams_s * signature;
struct pgpDigParams_s * pubkey;
};
typedef const struct pgpValTbl_s {
int val;
char const * const str;
} * pgpValTbl;
static struct pgpValTbl_s const pgpSigTypeTbl[] = {
{ PGPSIGTYPE_BINARY, "Binary document signature" },
{ PGPSIGTYPE_TEXT, "Text document signature" },
{ PGPSIGTYPE_STANDALONE, "Standalone signature" },
{ PGPSIGTYPE_GENERIC_CERT, "Generic certification of a User ID and Public Key" },
{ PGPSIGTYPE_PERSONA_CERT, "Persona certification of a User ID and Public Key" },
{ PGPSIGTYPE_CASUAL_CERT, "Casual certification of a User ID and Public Key" },
{ PGPSIGTYPE_POSITIVE_CERT, "Positive certification of a User ID and Public Key" },
{ PGPSIGTYPE_SUBKEY_BINDING,"Subkey Binding Signature" },
{ PGPSIGTYPE_SIGNED_KEY, "Signature directly on a key" },
{ PGPSIGTYPE_KEY_REVOKE, "Key revocation signature" },
{ PGPSIGTYPE_SUBKEY_REVOKE, "Subkey revocation signature" },
{ PGPSIGTYPE_CERT_REVOKE, "Certification revocation signature" },
{ PGPSIGTYPE_TIMESTAMP, "Timestamp signature" },
{ -1, "Unknown signature type" },
};
static struct pgpValTbl_s const pgpPubkeyTbl[] = {
{ PGPPUBKEYALGO_RSA, "RSA" },
{ PGPPUBKEYALGO_RSA_ENCRYPT,"RSA(Encrypt-Only)" },
{ PGPPUBKEYALGO_RSA_SIGN, "RSA(Sign-Only)" },
{ PGPPUBKEYALGO_ELGAMAL_ENCRYPT,"Elgamal(Encrypt-Only)" },
{ PGPPUBKEYALGO_DSA, "DSA" },
{ PGPPUBKEYALGO_EC, "Elliptic Curve" },
{ PGPPUBKEYALGO_ECDSA, "ECDSA" },
{ PGPPUBKEYALGO_ELGAMAL, "Elgamal" },
{ PGPPUBKEYALGO_DH, "Diffie-Hellman (X9.42)" },
{ PGPPUBKEYALGO_EDDSA, "EdDSA" },
{ -1, "Unknown public key algorithm" },
};
static struct pgpValTbl_s const pgpSymkeyTbl[] = {
{ PGPSYMKEYALGO_PLAINTEXT, "Plaintext" },
{ PGPSYMKEYALGO_IDEA, "IDEA" },
{ PGPSYMKEYALGO_TRIPLE_DES, "3DES" },
{ PGPSYMKEYALGO_CAST5, "CAST5" },
{ PGPSYMKEYALGO_BLOWFISH, "BLOWFISH" },
{ PGPSYMKEYALGO_SAFER, "SAFER" },
{ PGPSYMKEYALGO_DES_SK, "DES/SK" },
{ PGPSYMKEYALGO_AES_128, "AES(128-bit key)" },
{ PGPSYMKEYALGO_AES_192, "AES(192-bit key)" },
{ PGPSYMKEYALGO_AES_256, "AES(256-bit key)" },
{ PGPSYMKEYALGO_TWOFISH, "TWOFISH(256-bit key)" },
{ PGPSYMKEYALGO_NOENCRYPT, "no encryption" },
{ -1, "Unknown symmetric key algorithm" },
};
static struct pgpValTbl_s const pgpCompressionTbl[] = {
{ PGPCOMPRESSALGO_NONE, "Uncompressed" },
{ PGPCOMPRESSALGO_ZIP, "ZIP" },
{ PGPCOMPRESSALGO_ZLIB, "ZLIB" },
{ PGPCOMPRESSALGO_BZIP2, "BZIP2" },
{ -1, "Unknown compression algorithm" },
};
static struct pgpValTbl_s const pgpHashTbl[] = {
{ PGPHASHALGO_MD5, "MD5" },
{ PGPHASHALGO_SHA1, "SHA1" },
{ PGPHASHALGO_RIPEMD160, "RIPEMD160" },
{ PGPHASHALGO_MD2, "MD2" },
{ PGPHASHALGO_TIGER192, "TIGER192" },
{ PGPHASHALGO_HAVAL_5_160, "HAVAL-5-160" },
{ PGPHASHALGO_SHA256, "SHA256" },
{ PGPHASHALGO_SHA384, "SHA384" },
{ PGPHASHALGO_SHA512, "SHA512" },
{ PGPHASHALGO_SHA224, "SHA224" },
{ -1, "Unknown hash algorithm" },
};
static struct pgpValTbl_s const pgpKeyServerPrefsTbl[] = {
{ 0x80, "No-modify" },
{ -1, "Unknown key server preference" },
};
static struct pgpValTbl_s const pgpSubTypeTbl[] = {
{ PGPSUBTYPE_SIG_CREATE_TIME,"signature creation time" },
{ PGPSUBTYPE_SIG_EXPIRE_TIME,"signature expiration time" },
{ PGPSUBTYPE_EXPORTABLE_CERT,"exportable certification" },
{ PGPSUBTYPE_TRUST_SIG, "trust signature" },
{ PGPSUBTYPE_REGEX, "regular expression" },
{ PGPSUBTYPE_REVOCABLE, "revocable" },
{ PGPSUBTYPE_KEY_EXPIRE_TIME,"key expiration time" },
{ PGPSUBTYPE_ARR, "additional recipient request" },
{ PGPSUBTYPE_PREFER_SYMKEY, "preferred symmetric algorithms" },
{ PGPSUBTYPE_REVOKE_KEY, "revocation key" },
{ PGPSUBTYPE_ISSUER_KEYID, "issuer key ID" },
{ PGPSUBTYPE_NOTATION, "notation data" },
{ PGPSUBTYPE_PREFER_HASH, "preferred hash algorithms" },
{ PGPSUBTYPE_PREFER_COMPRESS,"preferred compression algorithms" },
{ PGPSUBTYPE_KEYSERVER_PREFERS,"key server preferences" },
{ PGPSUBTYPE_PREFER_KEYSERVER,"preferred key server" },
{ PGPSUBTYPE_PRIMARY_USERID,"primary user id" },
{ PGPSUBTYPE_POLICY_URL, "policy URL" },
{ PGPSUBTYPE_KEY_FLAGS, "key flags" },
{ PGPSUBTYPE_SIGNER_USERID, "signer's user id" },
{ PGPSUBTYPE_REVOKE_REASON, "reason for revocation" },
{ PGPSUBTYPE_FEATURES, "features" },
{ PGPSUBTYPE_EMBEDDED_SIG, "embedded signature" },
{ PGPSUBTYPE_INTERNAL_100, "internal subpkt type 100" },
{ PGPSUBTYPE_INTERNAL_101, "internal subpkt type 101" },
{ PGPSUBTYPE_INTERNAL_102, "internal subpkt type 102" },
{ PGPSUBTYPE_INTERNAL_103, "internal subpkt type 103" },
{ PGPSUBTYPE_INTERNAL_104, "internal subpkt type 104" },
{ PGPSUBTYPE_INTERNAL_105, "internal subpkt type 105" },
{ PGPSUBTYPE_INTERNAL_106, "internal subpkt type 106" },
{ PGPSUBTYPE_INTERNAL_107, "internal subpkt type 107" },
{ PGPSUBTYPE_INTERNAL_108, "internal subpkt type 108" },
{ PGPSUBTYPE_INTERNAL_109, "internal subpkt type 109" },
{ PGPSUBTYPE_INTERNAL_110, "internal subpkt type 110" },
{ -1, "Unknown signature subkey type" },
};
static struct pgpValTbl_s const pgpTagTbl[] = {
{ PGPTAG_PUBLIC_SESSION_KEY,"Public-Key Encrypted Session Key" },
{ PGPTAG_SIGNATURE, "Signature" },
{ PGPTAG_SYMMETRIC_SESSION_KEY,"Symmetric-Key Encrypted Session Key" },
{ PGPTAG_ONEPASS_SIGNATURE, "One-Pass Signature" },
{ PGPTAG_SECRET_KEY, "Secret Key" },
{ PGPTAG_PUBLIC_KEY, "Public Key" },
{ PGPTAG_SECRET_SUBKEY, "Secret Subkey" },
{ PGPTAG_COMPRESSED_DATA, "Compressed Data" },
{ PGPTAG_SYMMETRIC_DATA, "Symmetrically Encrypted Data" },
{ PGPTAG_MARKER, "Marker" },
{ PGPTAG_LITERAL_DATA, "Literal Data" },
{ PGPTAG_TRUST, "Trust" },
{ PGPTAG_USER_ID, "User ID" },
{ PGPTAG_PUBLIC_SUBKEY, "Public Subkey" },
{ PGPTAG_COMMENT_OLD, "Comment (from OpenPGP draft)" },
{ PGPTAG_PHOTOID, "PGP's photo ID" },
{ PGPTAG_ENCRYPTED_MDC, "Integrity protected encrypted data" },
{ PGPTAG_MDC, "Manipulaion detection code packet" },
{ PGPTAG_PRIVATE_60, "Private #60" },
{ PGPTAG_COMMENT, "Comment" },
{ PGPTAG_PRIVATE_62, "Private #62" },
{ PGPTAG_CONTROL, "Control (GPG)" },
{ -1, "Unknown packet tag" },
};
static struct pgpValTbl_s const pgpArmorTbl[] = {
{ PGPARMOR_MESSAGE, "MESSAGE" },
{ PGPARMOR_PUBKEY, "PUBLIC KEY BLOCK" },
{ PGPARMOR_SIGNATURE, "SIGNATURE" },
{ PGPARMOR_SIGNED_MESSAGE, "SIGNED MESSAGE" },
{ PGPARMOR_FILE, "ARMORED FILE" },
{ PGPARMOR_PRIVKEY, "PRIVATE KEY BLOCK" },
{ PGPARMOR_SECKEY, "SECRET KEY BLOCK" },
{ -1, "Unknown armor block" }
};
static struct pgpValTbl_s const pgpArmorKeyTbl[] = {
{ PGPARMORKEY_VERSION, "Version: " },
{ PGPARMORKEY_COMMENT, "Comment: " },
{ PGPARMORKEY_MESSAGEID, "MessageID: " },
{ PGPARMORKEY_HASH, "Hash: " },
{ PGPARMORKEY_CHARSET, "Charset: " },
{ -1, "Unknown armor key" }
};
static void pgpPrtNL(void)
{
if (!_print) return;
fprintf(stderr, "\n");
}
static const char * pgpValStr(pgpValTbl vs, uint8_t val)
{
do {
if (vs->val == val)
break;
} while ((++vs)->val != -1);
return vs->str;
}
static pgpValTbl pgpValTable(pgpValType type)
{
switch (type) {
case PGPVAL_TAG: return pgpTagTbl;
case PGPVAL_ARMORBLOCK: return pgpArmorTbl;
case PGPVAL_ARMORKEY: return pgpArmorKeyTbl;
case PGPVAL_SIGTYPE: return pgpSigTypeTbl;
case PGPVAL_SUBTYPE: return pgpSubTypeTbl;
case PGPVAL_PUBKEYALGO: return pgpPubkeyTbl;
case PGPVAL_SYMKEYALGO: return pgpSymkeyTbl;
case PGPVAL_COMPRESSALGO: return pgpCompressionTbl;
case PGPVAL_HASHALGO: return pgpHashTbl;
case PGPVAL_SERVERPREFS: return pgpKeyServerPrefsTbl;
default:
break;
}
return NULL;
}
const char * pgpValString(pgpValType type, uint8_t val)
{
pgpValTbl tbl = pgpValTable(type);
return (tbl != NULL) ? pgpValStr(tbl, val) : NULL;
}
static void pgpPrtHex(const char *pre, const uint8_t *p, size_t plen)
{
char *hex = NULL;
if (!_print) return;
if (pre && *pre)
fprintf(stderr, "%s", pre);
hex = rpmhex(p, plen);
fprintf(stderr, " %s", hex);
free(hex);
}
static void pgpPrtVal(const char * pre, pgpValTbl vs, uint8_t val)
{
if (!_print) return;
if (pre && *pre)
fprintf(stderr, "%s", pre);
fprintf(stderr, "%s(%u)", pgpValStr(vs, val), (unsigned)val);
}
static void pgpPrtTime(const char * pre, const uint8_t *p, size_t plen)
{
if (!_print) return;
if (pre && *pre)
fprintf(stderr, "%s", pre);
if (plen == 4) {
char buf[1024];
time_t t = pgpGrab(p, plen);
struct tm _tm, *tms = localtime_r(&t, &_tm);
if (strftime(buf, sizeof(buf), "%c", tms) > 0)
fprintf(stderr, " %-24.24s(0x%08x)", buf, (unsigned)t);
} else {
pgpPrtHex("", p+1, plen-1);
}
}
/** \ingroup rpmpgp
* Return value of an OpenPGP string.
* @param vs table of (string,value) pairs
* @param s string token to lookup
* @param se end-of-string address
* @return byte value
*/
static inline
int pgpValTok(pgpValTbl vs, const char * s, const char * se)
{
do {
size_t vlen = strlen(vs->str);
if (vlen <= (se-s) && rstreqn(s, vs->str, vlen))
break;
} while ((++vs)->val != -1);
return vs->val;
}
/** \ingroup rpmpgp
* Decode length from 1, 2, or 5 octet body length encoding, used in
* new format packet headers and V4 signature subpackets.
* Partial body lengths are (intentionally) not supported.
* @param s pointer to length encoding buffer
* @param slen buffer size
* @param[out] *lenp decoded length
* @return no. of bytes used to encode the length, 0 on error
*/
static inline
size_t pgpLen(const uint8_t *s, size_t slen, size_t * lenp)
{
size_t dlen = 0;
size_t lenlen = 0;
/*
* Callers can only ensure we'll always have the first byte, beyond
* that the required size is not known until we decode it so we need
* to check if we have enough bytes to read the size as we go.
*/
if (*s < 192) {
lenlen = 1;
dlen = *s;
} else if (*s < 224 && slen > 2) {
lenlen = 2;
dlen = (((s[0]) - 192) << 8) + s[1] + 192;
} else if (*s == 255 && slen > 5) {
lenlen = 5;
dlen = pgpGrab(s+1, 4);
}
if (slen - lenlen < dlen)
lenlen = 0;
if (lenlen)
*lenp = dlen;
return lenlen;
}
struct pgpPkt {
uint8_t tag; /* decoded PGP tag */
const uint8_t *head; /* pointer to start of packet (header) */
const uint8_t *body; /* pointer to packet body */
size_t blen; /* length of body in bytes */
};
/** \ingroup rpmpgp
* Read a length field `nbytes` long. Checks that the buffer is big enough to
* hold `nbytes + *valp` bytes.
* @param s pointer to read from
* @param nbytes length of length field
* @param send pointer past end of buffer
* @param[out] *valp decoded length
* @return 0 if buffer can hold `nbytes + *valp` of data,
* otherwise -1.
*/
static int pgpGet(const uint8_t *s, size_t nbytes, const uint8_t *send,
size_t *valp)
{
int rc = -1;
*valp = 0;
if (nbytes <= 4 && send - s >= nbytes) {
unsigned int val = pgpGrab(s, nbytes);
if (send - s - nbytes >= val) {
rc = 0;
*valp = val;
}
}
return rc;
}
static int decodePkt(const uint8_t *p, size_t plen, struct pgpPkt *pkt)
{
int rc = -1; /* assume failure */
/* Valid PGP packet header must always have two or more bytes in it */
if (p && plen >= 2 && p[0] & 0x80) {
size_t lenlen = 0;
size_t hlen = 0;
if (p[0] & 0x40) {
/* New format packet, body length encoding in second byte */
lenlen = pgpLen(p+1, plen-1, &pkt->blen);
pkt->tag = (p[0] & 0x3f);
} else {
/* Old format packet, body length encoding in tag byte */
lenlen = (1 << (p[0] & 0x3));
/* Reject indefinite length packets and check bounds */
if (pgpGet(p + 1, lenlen, p + plen, &pkt->blen))
return rc;
pkt->tag = (p[0] >> 2) & 0xf;
}
hlen = lenlen + 1;
/* Does the packet header and its body fit in our boundaries? */
if (lenlen && (hlen + pkt->blen <= plen)) {
pkt->head = p;
pkt->body = pkt->head + hlen;
rc = 0;
}
}
return rc;
}
#define CRC24_INIT 0xb704ce
#define CRC24_POLY 0x1864cfb
/** \ingroup rpmpgp
* Return CRC of a buffer.
* @param octets bytes
* @param len no. of bytes
* @return crc of buffer
*/
static inline
unsigned int pgpCRC(const uint8_t *octets, size_t len)
{
unsigned int crc = CRC24_INIT;
size_t i;
while (len--) {
crc ^= (*octets++) << 16;
for (i = 0; i < 8; i++) {
crc <<= 1;
if (crc & 0x1000000)
crc ^= CRC24_POLY;
}
}
return crc & 0xffffff;
}
static int pgpVersion(const uint8_t *h, size_t hlen, uint8_t *version)
{
if (hlen < 1)
return -1;
*version = h[0];
return 0;
}
int pgpSignatureType(pgpDigParams _digp)
{
int rc = -1;
if (_digp && _digp->tag == PGPTAG_SIGNATURE)
rc = _digp->sigtype;
return rc;
}
static int pgpPrtSubType(const uint8_t *h, size_t hlen, pgpSigType sigtype,
pgpDigParams _digp, int hashed)
{
const uint8_t *p = h;
size_t plen = 0, i;
int rc = 0;
while (hlen > 0 && rc == 0) {
int impl = 0;
i = pgpLen(p, hlen, &plen);
if (i == 0 || plen < 1 || i + plen > hlen)
break;
p += i;
hlen -= i;
pgpPrtVal(" ", pgpSubTypeTbl, (p[0]&(~PGPSUBTYPE_CRITICAL)));
if (p[0] & PGPSUBTYPE_CRITICAL)
if (_print)
fprintf(stderr, " *CRITICAL*");
switch (*p & ~PGPSUBTYPE_CRITICAL) {
case PGPSUBTYPE_PREFER_SYMKEY: /* preferred symmetric algorithms */
for (i = 1; i < plen; i++)
pgpPrtVal(" ", pgpSymkeyTbl, p[i]);
break;
case PGPSUBTYPE_PREFER_HASH: /* preferred hash algorithms */
for (i = 1; i < plen; i++)
pgpPrtVal(" ", pgpHashTbl, p[i]);
break;
case PGPSUBTYPE_PREFER_COMPRESS:/* preferred compression algorithms */
for (i = 1; i < plen; i++)
pgpPrtVal(" ", pgpCompressionTbl, p[i]);
break;
case PGPSUBTYPE_KEYSERVER_PREFERS:/* key server preferences */
for (i = 1; i < plen; i++)
pgpPrtVal(" ", pgpKeyServerPrefsTbl, p[i]);
break;
case PGPSUBTYPE_SIG_CREATE_TIME: /* signature creation time */
if (!hashed)
break; /* RFC 4880 §5.2.3.4 creation time MUST be hashed */
if (plen-1 != sizeof(_digp->time))
break; /* other lengths not understood */
if (_digp->saved & PGPDIG_SIG_HAS_CREATION_TIME)
return 1; /* duplicate timestamps not allowed */
impl = *p;
if (!(_digp->saved & PGPDIG_SAVED_TIME))
_digp->time = pgpGrab(p+1, sizeof(_digp->time));
_digp->saved |= PGPDIG_SAVED_TIME | PGPDIG_SIG_HAS_CREATION_TIME;
break;
case PGPSUBTYPE_SIG_EXPIRE_TIME:
case PGPSUBTYPE_KEY_EXPIRE_TIME:
pgpPrtTime(" ", p+1, plen-1);
break;
case PGPSUBTYPE_ISSUER_KEYID: /* issuer key ID */
impl = *p;
if (!(_digp->saved & PGPDIG_SAVED_ID) &&
(sigtype == PGPSIGTYPE_POSITIVE_CERT || sigtype == PGPSIGTYPE_BINARY || sigtype == PGPSIGTYPE_TEXT || sigtype == PGPSIGTYPE_STANDALONE))
{
if (plen-1 != sizeof(_digp->signid))
break;
_digp->saved |= PGPDIG_SAVED_ID;
memcpy(_digp->signid, p+1, sizeof(_digp->signid));
}
case PGPSUBTYPE_KEY_FLAGS: /* Key usage flags */
/* Subpackets in the unhashed section cannot be trusted */
if (!hashed)
break;
/* Reject duplicate key usage flags */
if (_digp->saved & PGPDIG_SIG_HAS_KEY_FLAGS)
return 1;
impl = *p;
_digp->saved |= PGPDIG_SIG_HAS_KEY_FLAGS;
_digp->key_flags = plen >= 2 ? p[1] : 0;
break;
case PGPSUBTYPE_EXPORTABLE_CERT:
case PGPSUBTYPE_TRUST_SIG:
case PGPSUBTYPE_REGEX:
case PGPSUBTYPE_REVOCABLE:
case PGPSUBTYPE_ARR:
case PGPSUBTYPE_REVOKE_KEY:
case PGPSUBTYPE_NOTATION:
case PGPSUBTYPE_PREFER_KEYSERVER:
case PGPSUBTYPE_PRIMARY_USERID:
case PGPSUBTYPE_POLICY_URL:
case PGPSUBTYPE_SIGNER_USERID:
case PGPSUBTYPE_REVOKE_REASON:
case PGPSUBTYPE_FEATURES:
case PGPSUBTYPE_EMBEDDED_SIG:
case PGPSUBTYPE_INTERNAL_100:
case PGPSUBTYPE_INTERNAL_101:
case PGPSUBTYPE_INTERNAL_102:
case PGPSUBTYPE_INTERNAL_103:
case PGPSUBTYPE_INTERNAL_104:
case PGPSUBTYPE_INTERNAL_105:
case PGPSUBTYPE_INTERNAL_106:
case PGPSUBTYPE_INTERNAL_107:
case PGPSUBTYPE_INTERNAL_108:
case PGPSUBTYPE_INTERNAL_109:
case PGPSUBTYPE_INTERNAL_110:
default:
pgpPrtHex("", p+1, plen-1);
break;
}
pgpPrtNL();
if (!impl && (p[0] & PGPSUBTYPE_CRITICAL))
rc = 1;
p += plen;
hlen -= plen;
}
if (hlen != 0)
rc = 1;
return rc;
}
pgpDigAlg pgpDigAlgFree(pgpDigAlg alg)
{
if (alg) {
if (alg->free)
alg->free(alg);
free(alg);
}
return NULL;
}
static int processMpis(const int mpis, pgpDigAlg sigalg,
const uint8_t *p, const uint8_t *const pend)
{
int i = 0, rc = 1; /* assume failure */
for (; i < mpis && pend - p >= 2; i++) {
unsigned int mpil = pgpMpiLen(p);
if (pend - p < mpil)
return rc;
if (sigalg && sigalg->setmpi(sigalg, i, p))
return rc;
p += mpil;
}
/* Does the size and number of MPI's match our expectations? */
if (p == pend && i == mpis)
rc = 0;
return rc;
}
static int pgpPrtSigParams(pgpTag tag, uint8_t pubkey_algo,
const uint8_t *p, const uint8_t *h, size_t hlen,
pgpDigParams sigp)
{
const uint8_t * pend = h + hlen;
pgpDigAlg sigalg = pgpSignatureNew(pubkey_algo);
int rc = processMpis(sigalg->mpis, sigalg, p, pend);
/* We can't handle more than one sig at a time */
if (rc == 0 && sigp->alg == NULL && sigp->tag == PGPTAG_SIGNATURE)
sigp->alg = sigalg;
else
pgpDigAlgFree(sigalg);
return rc;
}
static int pgpPrtSig(pgpTag tag, const uint8_t *h, size_t hlen,
pgpDigParams _digp)
{
uint8_t version = 0;
const uint8_t * p;
size_t plen;
int rc = 1;
/* Reset the saved flags */
_digp->saved &= PGPDIG_SAVED_TIME | PGPDIG_SAVED_ID;
_digp->key_flags = 0;
if (pgpVersion(h, hlen, &version))
return rc;
switch (version) {
case 3:
{ pgpPktSigV3 v = (pgpPktSigV3)h;
if (hlen <= sizeof(*v) || v->hashlen != 5)
return 1;
pgpPrtVal("V3 ", pgpTagTbl, tag);
pgpPrtVal(" ", pgpPubkeyTbl, v->pubkey_algo);
pgpPrtVal(" ", pgpHashTbl, v->hash_algo);
pgpPrtVal(" ", pgpSigTypeTbl, v->sigtype);
pgpPrtNL();
pgpPrtTime(" ", v->time, sizeof(v->time));
pgpPrtNL();
pgpPrtHex(" signer keyid", v->signid, sizeof(v->signid));
plen = pgpGrab(v->signhash16, sizeof(v->signhash16));
pgpPrtHex(" signhash16", v->signhash16, sizeof(v->signhash16));
pgpPrtNL();
if (_digp->pubkey_algo == 0) {
_digp->version = v->version;
_digp->hashlen = v->hashlen;
_digp->sigtype = v->sigtype;
_digp->hash = memcpy(xmalloc(v->hashlen), &v->sigtype, v->hashlen);
if (!(_digp->saved & PGPDIG_SAVED_TIME))
_digp->time = pgpGrab(v->time, sizeof(v->time));
if (!(_digp->saved & PGPDIG_SAVED_ID))
memcpy(_digp->signid, v->signid, sizeof(_digp->signid));
_digp->saved = PGPDIG_SAVED_TIME | PGPDIG_SIG_HAS_CREATION_TIME | PGPDIG_SAVED_ID;
_digp->pubkey_algo = v->pubkey_algo;
_digp->hash_algo = v->hash_algo;
memcpy(_digp->signhash16, v->signhash16, sizeof(_digp->signhash16));
}
p = ((uint8_t *)v) + sizeof(*v);
rc = tag ? pgpPrtSigParams(tag, v->pubkey_algo, p, h, hlen, _digp) : 0;
} break;
case 4:
{ pgpPktSigV4 v = (pgpPktSigV4)h;
const uint8_t *const hend = h + hlen;
if (hlen <= sizeof(*v))
return 1;
pgpPrtVal("V4 ", pgpTagTbl, tag);
pgpPrtVal(" ", pgpPubkeyTbl, v->pubkey_algo);
pgpPrtVal(" ", pgpHashTbl, v->hash_algo);
pgpPrtVal(" ", pgpSigTypeTbl, v->sigtype);
pgpPrtNL();
p = &v->hashlen[0];
if (pgpGet(v->hashlen, sizeof(v->hashlen), hend, &plen))
return 1;
p += sizeof(v->hashlen);
if ((p + plen) > hend)
return 1;
if (_digp->pubkey_algo == 0) {
_digp->hashlen = sizeof(*v) + plen;
_digp->hash = memcpy(xmalloc(_digp->hashlen), v, _digp->hashlen);
}
if (pgpPrtSubType(p, plen, v->sigtype, _digp, 1))
return 1;
p += plen;
if (!(_digp->saved & PGPDIG_SIG_HAS_CREATION_TIME))
return 1; /* RFC 4880 §5.2.3.4 creation time MUST be hashed */
if (pgpGet(p, 2, hend, &plen))
return 1;
p += 2;
if ((p + plen) > hend)
return 1;
if (pgpPrtSubType(p, plen, v->sigtype, _digp, 0))
return 1;
p += plen;
if (h + hlen - p < 2)
return 1;
pgpPrtHex(" signhash16", p, 2);
pgpPrtNL();
if (_digp->pubkey_algo == 0) {
_digp->version = v->version;
_digp->sigtype = v->sigtype;
_digp->pubkey_algo = v->pubkey_algo;
_digp->hash_algo = v->hash_algo;
memcpy(_digp->signhash16, p, sizeof(_digp->signhash16));
}
p += 2;
if (p > hend)
return 1;
rc = tag ? pgpPrtSigParams(tag, v->pubkey_algo, p, h, hlen, _digp) : 0;
} break;
default:
rpmlog(RPMLOG_WARNING, _("Unsupported version of signature: V%d\n"), version);
rc = 1;
break;
}
return rc;
}
static uint8_t curve_oids[] = {
PGPCURVE_NIST_P_256, 0x08, 0x2a, 0x86, 0x48, 0xce, 0x3d, 0x03, 0x01, 0x07,
PGPCURVE_NIST_P_384, 0x05, 0x2b, 0x81, 0x04, 0x00, 0x22,
PGPCURVE_NIST_P_521, 0x05, 0x2b, 0x81, 0x04, 0x00, 0x23,
PGPCURVE_BRAINPOOL_P256R1, 0x09, 0x2b, 0x24, 0x03, 0x03, 0x02, 0x08, 0x01, 0x01, 0x07,
PGPCURVE_BRAINPOOL_P512R1, 0x09, 0x2b, 0x24, 0x03, 0x03, 0x02, 0x08, 0x01, 0x01, 0x0d,
PGPCURVE_ED25519, 0x09, 0x2b, 0x06, 0x01, 0x04, 0x01, 0xda, 0x47, 0x0f, 0x01,
PGPCURVE_CURVE25519, 0x0a, 0x2b, 0x06, 0x01, 0x04, 0x01, 0x97, 0x55, 0x01, 0x05, 0x01,
0,
};
static int pgpCurveByOid(const uint8_t *p, int l)
{
uint8_t *curve;
for (curve = curve_oids; *curve; curve += 2 + curve[1])
if (l == (int)curve[1] && !memcmp(p, curve + 2, l))
return (int)curve[0];
return 0;
}
static int pgpPrtPubkeyParams(uint8_t pubkey_algo,
const uint8_t *p, const uint8_t *h, size_t hlen,
pgpDigParams keyp)
{
int rc = 1;
const uint8_t *pend = h + hlen;
int curve = 0;
if (pubkey_algo == PGPPUBKEYALGO_EDDSA) {
int len = (hlen > 1) ? p[0] : 0;
if (len == 0 || len == 0xff || len >= hlen)
goto exit;
curve = pgpCurveByOid(p + 1, len);
p += len + 1;
}
pgpDigAlg keyalg = pgpPubkeyNew(pubkey_algo, curve);
rc = processMpis(keyalg->mpis, keyalg, p, pend);
/* We can't handle more than one key at a time */
if (rc == 0 && keyp->alg == NULL && (keyp->tag == PGPTAG_PUBLIC_KEY ||
keyp->tag == PGPTAG_PUBLIC_SUBKEY))
keyp->alg = keyalg;
else
pgpDigAlgFree(keyalg);
exit:
return rc;
}
static int pgpPrtKey(pgpTag tag, const uint8_t *h, size_t hlen,
pgpDigParams _digp)
{
uint8_t version = 0;
const uint8_t * p = NULL;
int rc = 1;
if (pgpVersion(h, hlen, &version))
return rc;
/* We only permit V4 keys, V3 keys are long long since deprecated */
switch (version) {
case 4:
{ pgpPktKeyV4 v = (pgpPktKeyV4)h;
if (hlen > sizeof(*v)) {
pgpPrtVal("V4 ", pgpTagTbl, tag);
pgpPrtVal(" ", pgpPubkeyTbl, v->pubkey_algo);
pgpPrtTime(" ", v->time, sizeof(v->time));
pgpPrtNL();
/* If _digp->hash is not NULL then signature is already loaded */
if (_digp->hash == NULL) {
_digp->version = v->version;
_digp->time = pgpGrab(v->time, sizeof(v->time));
_digp->pubkey_algo = v->pubkey_algo;
}
p = ((uint8_t *)v) + sizeof(*v);
rc = pgpPrtPubkeyParams(v->pubkey_algo, p, h, hlen, _digp);
}
} break;
default:
rpmlog(RPMLOG_WARNING, _("Unsupported version of key: V%d\n"), h[0]);
}
return rc;
}
static int pgpPrtUserID(pgpTag tag, const uint8_t *h, size_t hlen,
pgpDigParams _digp)
{
pgpPrtVal("", pgpTagTbl, tag);
if (_print)
fprintf(stderr, " \"%.*s\"", (int)hlen, (const char *)h);
pgpPrtNL();
free(_digp->userid);
_digp->userid = memcpy(xmalloc(hlen+1), h, hlen);
_digp->userid[hlen] = '\0';
return 0;
}
int pgpPubkeyFingerprint(const uint8_t *h, size_t hlen,
uint8_t **fp, size_t *fplen)
{
int rc = -1; /* assume failure */
const uint8_t *se;
const uint8_t *pend = h + hlen;
uint8_t version = 0;
if (pgpVersion(h, hlen, &version))
return rc;
/* We only permit V4 keys, V3 keys are long long since deprecated */
switch (version) {
case 4:
{ pgpPktKeyV4 v = (pgpPktKeyV4) (h);
int mpis = -1;
/* Packet must be strictly larger than v to have room for the
* required MPIs and (for EdDSA) the curve ID */
if (hlen < sizeof(*v) + sizeof(uint8_t))
return rc;
se = (uint8_t *)(v + 1);
switch (v->pubkey_algo) {
case PGPPUBKEYALGO_EDDSA:
/* EdDSA has a curve id before the MPIs */
if (se[0] == 0x00 || se[0] == 0xff || pend - se < 1 + se[0])
return rc;
se += 1 + se[0];
mpis = 1;
break;
case PGPPUBKEYALGO_RSA:
mpis = 2;
break;
case PGPPUBKEYALGO_DSA:
mpis = 4;
break;
default:
return rc;
}
/* Does the size and number of MPI's match our expectations? */
if (processMpis(mpis, NULL, se, pend) == 0) {
DIGEST_CTX ctx = rpmDigestInit(RPM_HASH_SHA1, RPMDIGEST_NONE);
uint8_t *d = NULL;
size_t dlen = 0;
uint8_t in[3] = { 0x99, (hlen >> 8), hlen };
(void) rpmDigestUpdate(ctx, in, 3);
(void) rpmDigestUpdate(ctx, h, hlen);
(void) rpmDigestFinal(ctx, (void **)&d, &dlen, 0);
if (dlen == 20) {
rc = 0;
*fp = d;
*fplen = dlen;
} else {
free(d);
}
}
} break;
default:
rpmlog(RPMLOG_WARNING, _("Unsupported version of key: V%d\n"), version);
}
return rc;
}
static int getKeyID(const uint8_t *h, size_t hlen, pgpKeyID_t keyid)
{
uint8_t *fp = NULL;
size_t fplen = 0;
int rc = pgpPubkeyFingerprint(h, hlen, &fp, &fplen);
if (fp && fplen > 8) {
memcpy(keyid, (fp + (fplen-8)), 8);
free(fp);
}
return rc;
}
int pgpPubkeyKeyID(const uint8_t * pkt, size_t pktlen, pgpKeyID_t keyid)
{
struct pgpPkt p;
if (decodePkt(pkt, pktlen, &p))
return -1;
return getKeyID(p.body, p.blen, keyid);
}
static int pgpPrtPkt(struct pgpPkt *p, pgpDigParams _digp)
{
int rc = 0;
switch (p->tag) {
case PGPTAG_SIGNATURE:
rc = pgpPrtSig(p->tag, p->body, p->blen, _digp);
break;
case PGPTAG_PUBLIC_KEY:
/* Get the public key Key ID. */
rc = getKeyID(p->body, p->blen, _digp->signid);
if (rc)
memset(_digp->signid, 0, sizeof(_digp->signid));
else {
_digp->saved |= PGPDIG_SAVED_ID;
rc = pgpPrtKey(p->tag, p->body, p->blen, _digp);
}
break;
case PGPTAG_USER_ID:
rc = pgpPrtUserID(p->tag, p->body, p->blen, _digp);
break;
case PGPTAG_RESERVED:
rc = -1;
break;
case PGPTAG_COMMENT:
case PGPTAG_COMMENT_OLD:
case PGPTAG_PUBLIC_SUBKEY:
case PGPTAG_SECRET_KEY:
case PGPTAG_SECRET_SUBKEY:
case PGPTAG_PUBLIC_SESSION_KEY:
case PGPTAG_SYMMETRIC_SESSION_KEY:
case PGPTAG_COMPRESSED_DATA:
case PGPTAG_SYMMETRIC_DATA:
case PGPTAG_MARKER:
case PGPTAG_LITERAL_DATA:
case PGPTAG_TRUST:
case PGPTAG_PHOTOID:
case PGPTAG_ENCRYPTED_MDC:
case PGPTAG_MDC:
case PGPTAG_PRIVATE_60:
case PGPTAG_PRIVATE_62:
case PGPTAG_CONTROL:
default:
pgpPrtVal("", pgpTagTbl, p->tag);
pgpPrtHex("", p->body, p->blen);
pgpPrtNL();
break;
}
return rc;
}
pgpDig pgpNewDig(void)
{
pgpDig dig = xcalloc(1, sizeof(*dig));
return dig;