rpm/lib/package.c

/** \ingroup header
 * \file lib/package.c
 */

#include "system.h"

#include <netinet/in.h>

#include <rpmio_internal.h>
#include <rpmlib.h>

#include "rpmts.h"

#include "misc.h"	/* XXX stripTrailingChar() */
#include "legacy.h"	/* XXX providePackageNVR() and compressFileList() */
#include "rpmlead.h"

#include "signature.h"
#include "debug.h"

#define	alloca_strdup(_s)	strcpy(alloca(strlen(_s)+1), (_s))

/*@access rpmTransactionSet@*/
/*@access Header @*/		/* XXX compared with NULL */
/*@access FD_t @*/		/* XXX stealing digests */

/*@unchecked@*/
static int _print_pkts = 0;

void headerMergeLegacySigs(Header h, const Header sig)
{
    HFD_t hfd = (HFD_t) headerFreeData;
    HAE_t hae = (HAE_t) headerAddEntry;
    HeaderIterator hi;
    int_32 tag, type, count;
    const void * ptr;
    int xx;

    for (hi = headerInitIterator(sig);
        headerNextIterator(hi, &tag, &type, &ptr, &count);
        ptr = hfd(ptr, type))
    {
	switch (tag) {
	/* XXX Translate legacy signature tag values. */
	case RPMSIGTAG_SIZE:
	    tag = RPMTAG_SIGSIZE;
	    /*@switchbreak@*/ break;
	case RPMSIGTAG_LEMD5_1:
	    tag = RPMTAG_SIGLEMD5_1;
	    /*@switchbreak@*/ break;
	case RPMSIGTAG_PGP:
	    tag = RPMTAG_SIGPGP;
	    /*@switchbreak@*/ break;
	case RPMSIGTAG_LEMD5_2:
	    tag = RPMTAG_SIGLEMD5_2;
	    /*@switchbreak@*/ break;
	case RPMSIGTAG_MD5:
	    tag = RPMTAG_SIGMD5;
	    /*@switchbreak@*/ break;
	case RPMSIGTAG_GPG:
	    tag = RPMTAG_SIGGPG;
	    /*@switchbreak@*/ break;
	case RPMSIGTAG_PGP5:
	    tag = RPMTAG_SIGPGP5;
	    /*@switchbreak@*/ break;
	case RPMSIGTAG_PAYLOADSIZE:
	    tag = RPMTAG_ARCHIVESIZE;
	    /*@switchbreak@*/ break;
	case RPMSIGTAG_SHA1:
	case RPMSIGTAG_DSA:
	case RPMSIGTAG_RSA:
	default:
	    if (!(tag >= HEADER_SIGBASE && tag < HEADER_TAGBASE))
		continue;
	    /*@switchbreak@*/ break;
	}
	if (ptr == NULL) continue;	/* XXX can't happen */
	if (!headerIsEntry(h, tag))
	    xx = hae(h, tag, type, ptr, count);
    }
    hi = headerFreeIterator(hi);
}

Header headerRegenSigHeader(const Header h)
{
    HFD_t hfd = (HFD_t) headerFreeData;
    Header sig = rpmNewSignature();
    HeaderIterator hi;
    int_32 tag, stag, type, count;
    const void * ptr;
    int xx;

    for (hi = headerInitIterator(h);
        headerNextIterator(hi, &tag, &type, &ptr, &count);
        ptr = hfd(ptr, type))
    {
	switch (tag) {
	/* XXX Translate legacy signature tag values. */
	case RPMTAG_SIGSIZE:
	    stag = RPMSIGTAG_SIZE;
	    /*@switchbreak@*/ break;
	case RPMTAG_SIGLEMD5_1:
	    stag = RPMSIGTAG_LEMD5_1;
	    /*@switchbreak@*/ break;
	case RPMTAG_SIGPGP:
	    stag = RPMSIGTAG_PGP;
	    /*@switchbreak@*/ break;
	case RPMTAG_SIGLEMD5_2:
	    stag = RPMSIGTAG_LEMD5_2;
	    /*@switchbreak@*/ break;
	case RPMTAG_SIGMD5:
	    stag = RPMSIGTAG_MD5;
	    /*@switchbreak@*/ break;
	case RPMTAG_SIGGPG:
	    stag = RPMSIGTAG_GPG;
	    /*@switchbreak@*/ break;
	case RPMTAG_SIGPGP5:
	    stag = RPMSIGTAG_PGP5;
	    /*@switchbreak@*/ break;
	case RPMTAG_ARCHIVESIZE:
	    stag = RPMSIGTAG_PAYLOADSIZE;
	    /*@switchbreak@*/ break;
	case RPMTAG_SHA1HEADER:
	case RPMTAG_DSAHEADER:
	case RPMTAG_RSAHEADER:
	default:
	    if (!(tag >= HEADER_SIGBASE && tag < HEADER_TAGBASE))
		continue;
	    stag = tag;
	    /*@switchbreak@*/ break;
	}
	if (ptr == NULL) continue;	/* XXX can't happen */
	if (!headerIsEntry(sig, stag))
	    xx = headerAddEntry(sig, stag, type, ptr, count);
    }
    hi = headerFreeIterator(hi);
    return sig;
}

/*@unchecked@*/
static unsigned char header_magic[8] = {
        0x8e, 0xad, 0xe8, 0x01, 0x00, 0x00, 0x00, 0x00
};

int rpmReadPackageFile(rpmTransactionSet ts, FD_t fd,
		const char * fn, Header * hdrp)
{
    byte buf[8*BUFSIZ];
    ssize_t count;
    struct rpmlead * l = alloca(sizeof(*l));
    Header sig;
    Header h = NULL;
    int hmagic;
    rpmRC rc = RPMRC_FAIL;	/* assume failure */
    int xx;
    int i;

    {	struct stat st;
	memset(&st, 0, sizeof(st));
	(void) fstat(Fileno(fd), &st);
	/* if fd points to a socket, pipe, etc, st.st_size is *always* zero */
	if (S_ISREG(st.st_mode) && st.st_size < sizeof(*l))
	    goto exit;
    }

    memset(l, 0, sizeof(*l));
    if (readLead(fd, l)) {
	rpmError(RPMERR_READLEAD, _("%s: readLead failed\n"), fn);
	goto exit;
    }

    if (l->magic[0] != RPMLEAD_MAGIC0 || l->magic[1] != RPMLEAD_MAGIC1
     || l->magic[2] != RPMLEAD_MAGIC2 || l->magic[3] != RPMLEAD_MAGIC3) {
	rpmError(RPMERR_READLEAD, _("%s: bad magic\n"), fn);
	rc = RPMRC_BADMAGIC;
	goto exit;
    }

    switch (l->major) {
    case 1:
	rpmError(RPMERR_NEWPACKAGE,
	    _("packaging version 1 is not supported by this version of RPM\n"));
	goto exit;
	/*@notreached@*/ break;
    case 2:
    case 3:
    case 4:
	break;
    default:
	rpmError(RPMERR_NEWPACKAGE, _("only packaging with major numbers <= 4 "
		"is supported by this version of RPM\n"));
	goto exit;
	/*@notreached@*/ break;
    }

    /* Read the signature header. */
    rc = rpmReadSignature(fd, &sig, l->signature_type);
    if (!(rc == RPMRC_OK || rc == RPMRC_BADSIZE)) {
	rpmError(RPMERR_SIGGEN, _("%s: rpmReadSignature failed\n"), fn);
	goto exit;
    }
    if (sig == NULL) {
	rpmError(RPMERR_SIGGEN, _("%s: No signature available\n"), fn);
	rc = RPMRC_FAIL;
	goto exit;
    }

    /* Figger the most effective available signature. */
    ts->sigtag = 0;
    if (ts->verify_legacy) {
	if (ts->sigtag == 0 && !ts->nosignatures) {
	    if (headerIsEntry(sig, RPMSIGTAG_DSA))
		ts->sigtag = RPMSIGTAG_DSA;
	    else if (headerIsEntry(sig, RPMSIGTAG_RSA))
		ts->sigtag = RPMSIGTAG_RSA;
	    else if (headerIsEntry(sig, RPMSIGTAG_GPG)) {
		ts->sigtag = RPMSIGTAG_GPG;
		fdInitDigest(fd, PGPHASHALGO_SHA1, 0);
	    } else if (headerIsEntry(sig, RPMSIGTAG_PGP)) {
		ts->sigtag = RPMSIGTAG_PGP;
		fdInitDigest(fd, PGPHASHALGO_MD5, 0);
	    }
	}
	if (ts->sigtag == 0 && !ts->nodigests) {
	    if (headerIsEntry(sig, RPMSIGTAG_SHA1))
		ts->sigtag = RPMSIGTAG_SHA1;
	    else if (headerIsEntry(sig, RPMSIGTAG_MD5)) {
		ts->sigtag = RPMSIGTAG_MD5;
		fdInitDigest(fd, PGPHASHALGO_MD5, 0);
	    }
	}
    } else {
	if (ts->sigtag == 0 && !ts->nosignatures) {
	    if (headerIsEntry(sig, RPMSIGTAG_DSA))
		ts->sigtag = RPMSIGTAG_DSA;
	    else if (headerIsEntry(sig, RPMSIGTAG_RSA))
		ts->sigtag = RPMSIGTAG_RSA;
	}
	if (ts->sigtag == 0 && !ts->nodigests) {
	    if (headerIsEntry(sig, RPMSIGTAG_SHA1))
		ts->sigtag = RPMSIGTAG_SHA1;
	}
    }

    /* Read the metadata, computing digest(s) on the fly. */
    hmagic = ((l->major >= 3) ? HEADER_MAGIC_YES : HEADER_MAGIC_NO);
    h = headerRead(fd, hmagic);
    if (h == NULL) {
	rpmError(RPMERR_FREAD, _("%s: headerRead failed\n"), fn);
	rc = RPMRC_FAIL;
	goto exit;
    }

    /* Any signatures to check? */
    if (ts->sigtag == 0) {
	rc = RPMRC_OK;
	goto exit;
    }

    ts->dig = pgpNewDig();
    if (ts->dig == NULL) {
	rc = RPMRC_OK;		/* XXX WRONG */
	goto exit;
    }
    ts->dig->nbytes = 0;

    /* Retrieve the tag parameters from the signature header. */
    ts->sig = NULL;
    xx = headerGetEntry(sig, ts->sigtag, &ts->sigtype,
		(void **) &ts->sig, &ts->siglen);
    if (ts->sig == NULL) {
	rc = RPMRC_OK;		/* XXX WRONG */
	goto exit;
    }

    switch (ts->sigtag) {
    case RPMSIGTAG_RSA:
	/* Parse the parameters from the OpenPGP packets that will be needed. */
	xx = pgpPrtPkts(ts->sig, ts->siglen, ts->dig,
			(_print_pkts & rpmIsDebug()));
	/* XXX only V3 signatures for now. */
	if (ts->dig->signature.version != 3) {
	    rpmMessage(RPMMESS_WARNING,
		_("only V3 signatures can be verified, skipping V%u signature"),
		ts->dig->signature.version);
	    rc = RPMRC_OK;
	    goto exit;
	}
    {	void * uh = NULL;
	int_32 uht;
	int_32 uhc;

	if (!headerGetEntry(h, RPMTAG_HEADERIMMUTABLE, &uht, &uh, &uhc))
	    break;
	ts->dig->md5ctx = rpmDigestInit(PGPHASHALGO_MD5, RPMDIGEST_NONE);
	(void) rpmDigestUpdate(ts->dig->md5ctx, header_magic, sizeof(header_magic));
	ts->dig->nbytes += sizeof(header_magic);
	(void) rpmDigestUpdate(ts->dig->md5ctx, uh, uhc);
	ts->dig->nbytes += uhc;
	uh = headerFreeData(uh, uht);
    }	break;
    case RPMSIGTAG_DSA:
	/* Parse the parameters from the OpenPGP packets that will be needed. */
	xx = pgpPrtPkts(ts->sig, ts->siglen, ts->dig,
			(_print_pkts & rpmIsDebug()));
	/* XXX only V3 signatures for now. */
	if (ts->dig->signature.version != 3) {
	    rpmMessage(RPMMESS_WARNING,
		_("only V3 signatures can be verified, skipping V%u signature"),
		ts->dig->signature.version);
	    rc = RPMRC_OK;
	    goto exit;
	}
	/*@fallthrough@*/
    case RPMSIGTAG_SHA1:
    {	void * uh = NULL;
	int_32 uht;
	int_32 uhc;

	if (!headerGetEntry(h, RPMTAG_HEADERIMMUTABLE, &uht, &uh, &uhc))
	    break;
	ts->dig->hdrsha1ctx = rpmDigestInit(PGPHASHALGO_SHA1, RPMDIGEST_NONE);
	(void) rpmDigestUpdate(ts->dig->hdrsha1ctx, header_magic, sizeof(header_magic));
	ts->dig->nbytes += sizeof(header_magic);
	(void) rpmDigestUpdate(ts->dig->hdrsha1ctx, uh, uhc);
	ts->dig->nbytes += uhc;
	uh = headerFreeData(uh, uht);
    }	break;
    case RPMSIGTAG_GPG:
    case RPMSIGTAG_PGP5:	/* XXX legacy */
    case RPMSIGTAG_PGP:
	/* Parse the parameters from the OpenPGP packets that will be needed. */
	xx = pgpPrtPkts(ts->sig, ts->siglen, ts->dig,
			(_print_pkts & rpmIsDebug()));

	/* XXX only V3 signatures for now. */
	if (ts->dig->signature.version != 3) {
	    rpmMessage(RPMMESS_WARNING,
		_("only V3 signatures can be verified, skipping V%u signature"),
		ts->dig->signature.version);
	    rc = RPMRC_OK;
	    goto exit;
	}
	/*@fallthrough@*/
    case RPMSIGTAG_MD5:
	/* Legacy signatures need the compressed payload in the digest too. */
	ts->dig->nbytes += headerSizeof(h, hmagic);
	while ((count = Fread(buf, sizeof(buf[0]), sizeof(buf), fd)) > 0)
	    ts->dig->nbytes += count;
	if (count < 0) {
	    rpmError(RPMERR_FREAD, _("%s: Fread failed: %s\n"),
					fn, Fstrerror(fd));
	    rc = RPMRC_FAIL;
	    goto exit;
	}
	ts->dig->nbytes += count;

	/* XXX Steal the digest-in-progress from the file handle. */
	for (i = fd->ndigests - 1; i >= 0; i--) {
	    FDDIGEST_t fddig = fd->digests + i;
	    if (fddig->hashctx == NULL)
		continue;
	    if (fddig->hashalgo == PGPHASHALGO_MD5) {
		ts->dig->md5ctx = fddig->hashctx;
		fddig->hashctx = NULL;
		continue;
	    }
	    if (fddig->hashalgo == PGPHASHALGO_SHA1) {
		ts->dig->sha1ctx = fddig->hashctx;
		fddig->hashctx = NULL;
		continue;
	    }
	}
	break;
    }

/** @todo Implement disable/enable/warn/error/anal policy. */

    buf[0] = '\0';
    switch (rpmVerifySignature(ts, buf)) {
    case RPMSIG_OK:		/* Signature is OK. */
	rpmMessage(RPMMESS_DEBUG, "%s: %s", fn, buf);
	rc = RPMRC_OK;
	break;
    case RPMSIG_UNKNOWN:	/* Signature is unknown. */
    case RPMSIG_NOKEY:		/* Key is unavailable. */
    case RPMSIG_NOTTRUSTED:	/* Signature is OK, but key is not trusted. */
	rpmMessage(RPMMESS_WARNING, "%s: %s", fn, buf);
	rc = RPMRC_OK;
	break;
    default:
    case RPMSIG_BAD:		/* Signature does not verify. */
	rpmMessage(RPMMESS_ERROR, "%s: %s", fn, buf);
	rc = RPMRC_OK;
	break;
    }

exit:
    if (rc == RPMRC_OK && hdrp != NULL) {
	/* Convert legacy headers on the fly ... */
	legacyRetrofit(h, l);
	
	/* Append (and remap) signature tags to the metadata. */
	headerMergeLegacySigs(h, sig);

	/* Bump reference count for return. */
	*hdrp = headerLink(h, "ReadPackageFile *hdrp");
    }
    h = headerFree(h, "ReadPackageFile");
    if (ts->sig != NULL)
	ts->sig = headerFreeData(ts->sig, ts->sigtype);
    if (ts->dig != NULL)
	ts->dig = pgpFreeDig(ts->dig);
    sig = rpmFreeSignature(sig);
    return rc;
}