nss-3.21nss-3.21

1 files changed, 508 insertions, 0 deletions

diff --git a/nss/lib/freebl/shvfy.c b/nss/lib/freebl/shvfy.c
new file mode 100644
index 0000000..ad64a26
--- /dev/null
+++ b/nss/lib/freebl/shvfy.c
@@ -0,0 +1,508 @@
+
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifdef FREEBL_NO_DEPEND
+#include "stubs.h"
+#endif
+
+#include "shsign.h"
+#include "prlink.h"
+#include "prio.h"
+#include "blapi.h"
+#include "seccomon.h"
+#include "stdio.h"
+#include "prmem.h"
+#include "hasht.h"
+#include "pqg.h"
+
+/*
+ * Most modern version of Linux support a speed optimization scheme where an
+ * application called prelink modifies programs and shared libraries to quickly
+ * load if they fit into an already designed address space. In short, prelink
+ * scans the list of programs and libraries on your system, assigns them a
+ * predefined space in the the address space, then provides the fixups to the
+ * library.
+
+ * The modification of the shared library is correctly detected by the freebl
+ * FIPS checksum scheme where we check a signed hash of the library against the
+ * library itself.
+ * 
+ * The prelink command itself can reverse the process of modification and
+ * output the prestine shared library as it was before prelink made it's
+ * changes. If FREEBL_USE_PRELINK is set Freebl uses prelink to output the
+ * original copy of the shared library before prelink modified it.
+ */
+#ifdef FREEBL_USE_PRELINK
+#ifndef FREELB_PRELINK_COMMAND
+#define FREEBL_PRELINK_COMMAND "/usr/sbin/prelink -u -o -"
+#endif
+#include "private/pprio.h"
+
+#include <stdlib.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/wait.h>
+#include <sys/stat.h>
+
+/*
+ * This function returns an NSPR PRFileDesc * which the caller can read to
+ * obtain the prestine value of the shared library, before any OS related
+ * changes to it (usually address fixups). 
+ *
+ * If prelink is installed, this
+ * file descriptor is a pipe connecting the output of 
+ *            /usr/sbin/prelink -u -o - {Library}
+ * and *pid returns the process id of the prelink child.
+ *
+ * If prelink is not installed, it returns a normal readonly handle to the
+ * library itself and *pid is set to '0'.
+ */
+PRFileDesc *
+bl_OpenUnPrelink(const char *shName, int *pid)
+{
+    char *command= strdup(FREEBL_PRELINK_COMMAND);
+    char *argString = NULL;
+    char  **argv = NULL;
+    char *shNameArg = NULL;
+    char *cp;
+    pid_t child;
+    int argc = 0, argNext = 0;
+    struct stat statBuf;
+    int pipefd[2] = {-1,-1};
+    int ret;
+
+    *pid = 0;
+
+    /* make sure the prelink command exists first. If not, fall back to
+     * just reading the file */
+    for (cp = command; *cp ; cp++) {
+	if (*cp == ' ') {
+	    *cp++ = 0;
+	    argString = cp;
+	    break;
+        }
+    }
+    memset (&statBuf, 0, sizeof(statBuf));
+    /* stat the file, follow the link */
+    ret = stat(command, &statBuf);
+    if (ret < 0) {
+	free(command);
+	return PR_Open(shName, PR_RDONLY, 0);
+    }
+    /* file exits, make sure it's an executable */
+    if (!S_ISREG(statBuf.st_mode) || 
+			((statBuf.st_mode & (S_IXUSR|S_IXGRP|S_IXOTH)) == 0)) {
+	free(command);
+	return PR_Open(shName, PR_RDONLY, 0);
+    }
+
+    /* OK, the prelink command exists and looks correct, use it */
+    /* build the arglist while we can still malloc */
+    /* count the args if any */
+    if (argString && *argString) {
+	/* argString may have leading spaces, strip them off*/
+	for (cp = argString; *cp && *cp == ' '; cp++);
+	argString = cp;
+	if (*cp) {
+	    /* there is at least one arg.. */
+	    argc = 1;
+	}
+
+        /* count the rest: Note there is no provision for escaped
+         * spaces here */
+	for (cp = argString; *cp ; cp++) {
+	    if (*cp == ' ') {
+		while (*cp && *cp == ' ') cp++;
+		if (*cp) argc++;
+	    }
+	}
+    }
+
+    /* add the additional args: argv[0] (command), shName, NULL*/
+    argc += 3;
+    argv = PORT_NewArray(char *, argc);
+    if (argv == NULL) {
+	goto loser;
+    }
+
+    /* fill in the arglist */
+    argv[argNext++] = command;
+    if (argString && *argString) {
+	argv[argNext++] = argString;
+	for (cp = argString; *cp; cp++) {
+	    if (*cp == ' ') {
+		*cp++ = 0;
+		while (*cp && *cp == ' ') cp++;
+		if (*cp) argv[argNext++] = cp;
+	    }
+	}
+    }
+    /* exec doesn't advertise taking const char **argv, do the paranoid
+     * copy */
+    shNameArg = strdup(shName);
+    if (shNameArg == NULL) {
+	goto loser;
+    }
+    argv[argNext++] = shNameArg;
+    argv[argNext++] = 0;
+    
+    ret = pipe(pipefd);
+    if (ret < 0) {
+	goto loser;
+    }
+
+    /* use vfork() so we don't trigger the pthread_at_fork() handlers */
+    child = vfork();
+    if (child < 0) goto loser;
+    if (child == 0) {
+	/* set up the file descriptors */
+	/* if we need to support BSD, this will need to be an open of 
+	 * /dev/null and dup2(nullFD, 0)*/
+	close(0);
+	/* associate pipefd[1] with stdout */
+	if (pipefd[1] != 1) dup2(pipefd[1], 1);
+	close(2);
+	close(pipefd[0]);
+	/* should probably close the other file descriptors? */
+
+
+	execv(command, argv);
+	/* avoid at_exit() handlers */
+	_exit(1); /* shouldn't reach here except on an error */
+    }
+    close(pipefd[1]);
+    pipefd[1] = -1;
+
+    /* this is safe because either vfork() as full fork() semantics, and thus
+     * already has it's own address space, or because vfork() has paused
+     * the parent util the exec or exit */
+    free(command);
+    free(shNameArg);
+    PORT_Free(argv);
+
+    *pid = child;
+
+    return PR_ImportPipe(pipefd[0]);
+
+loser:
+    if (pipefd[0] != -1) {
+	close(pipefd[0]);
+    }
+    if (pipefd[1] != -1) {
+	close(pipefd[1]);
+    }
+    free(command);
+    free(shNameArg);
+    PORT_Free(argv);
+
+    return NULL;
+}
+
+/*
+ * bl_CloseUnPrelink -
+ *
+ * This closes the file descripter and reaps and children openned and crated by
+ * b;_OpenUnprelink. It's primary difference between it and just close is
+ * that it calls wait on the pid if one is supplied, preventing zombie children
+ * from hanging around.
+ */
+void
+bl_CloseUnPrelink( PRFileDesc *file, int pid)
+{
+    /* close the file descriptor */
+    PR_Close(file);
+    /* reap the child */
+    if (pid) {
+	waitpid(pid, NULL, 0);
+    }
+}
+#endif
+
+/* #define DEBUG_SHVERIFY 1 */
+
+static char *
+mkCheckFileName(const char *libName)
+{
+    int ln_len = PORT_Strlen(libName);
+    char *output = PORT_Alloc(ln_len+sizeof(SGN_SUFFIX));
+    int index = ln_len + 1 - sizeof("."SHLIB_SUFFIX);
+
+    if ((index > 0) &&
+        (PORT_Strncmp(&libName[index],
+                        "."SHLIB_SUFFIX,sizeof("."SHLIB_SUFFIX)) == 0)) {
+        ln_len = index;
+    }
+    PORT_Memcpy(output,libName,ln_len);
+    PORT_Memcpy(&output[ln_len],SGN_SUFFIX,sizeof(SGN_SUFFIX));
+    return output;
+}
+
+static int
+decodeInt(unsigned char *buf)
+{
+    return (buf[3]) | (buf[2] << 8) | (buf[1] << 16) | (buf[0] << 24);
+}
+
+static SECStatus
+readItem(PRFileDesc *fd, SECItem *item)
+{
+    unsigned char buf[4];
+    int bytesRead;
+
+
+    bytesRead = PR_Read(fd, buf, 4);
+    if (bytesRead != 4) {
+	return SECFailure;
+    }
+    item->len = decodeInt(buf);
+
+    item->data = PORT_Alloc(item->len);
+    if (item->data == NULL) {
+	item->len = 0;
+	return SECFailure;
+    }
+    bytesRead = PR_Read(fd, item->data, item->len);
+    if (bytesRead != item->len) {
+	PORT_Free(item->data);
+	item->data = NULL;
+	item->len = 0;
+	return SECFailure;
+    }
+    return SECSuccess;
+}
+
+PRBool
+BLAPI_SHVerify(const char *name, PRFuncPtr addr)
+{
+    PRBool result = PR_FALSE; /* if anything goes wrong,
+			       * the signature does not verify */
+    /* find our shared library name */
+    char *shName = PR_GetLibraryFilePathname(name, addr);
+    if (!shName) {
+	goto loser;
+    }
+    result = BLAPI_SHVerifyFile(shName);
+
+loser:
+    if (shName != NULL) {
+	PR_Free(shName);
+    }
+
+    return result;
+}
+
+PRBool
+BLAPI_SHVerifyFile(const char *shName)
+{
+    char *checkName = NULL;
+    PRFileDesc *checkFD = NULL;
+    PRFileDesc *shFD = NULL;
+    void  *hashcx = NULL;
+    const SECHashObject *hashObj = NULL;
+    SECItem signature = { 0, NULL, 0 };
+    SECItem hash;
+    int bytesRead, offset;
+    SECStatus rv;
+    DSAPublicKey key;
+    int count;
+#ifdef FREEBL_USE_PRELINK
+    int pid = 0;
+#endif
+
+    PRBool result = PR_FALSE; /* if anything goes wrong,
+			       * the signature does not verify */
+    unsigned char buf[4096];
+    unsigned char hashBuf[HASH_LENGTH_MAX];
+
+    PORT_Memset(&key,0,sizeof(key));
+    hash.data = hashBuf;
+    hash.len = sizeof(hashBuf);
+
+    if (!shName) {
+	goto loser;
+    }
+
+    /* figure out the name of our check file */
+    checkName = mkCheckFileName(shName);
+    if (!checkName) {
+	goto loser;
+    }
+
+    /* open the check File */
+    checkFD = PR_Open(checkName, PR_RDONLY, 0);
+    if (checkFD == NULL) {
+#ifdef DEBUG_SHVERIFY
+        fprintf(stderr, "Failed to open the check file %s: (%d, %d)\n",
+                checkName, (int)PR_GetError(), (int)PR_GetOSError());
+#endif /* DEBUG_SHVERIFY */
+	goto loser;
+    }
+
+    /* read and Verify the headerthe header */
+    bytesRead = PR_Read(checkFD, buf, 12);
+    if (bytesRead != 12) {
+	goto loser;
+    }
+    if ((buf[0] != NSS_SIGN_CHK_MAGIC1) || (buf[1] != NSS_SIGN_CHK_MAGIC2)) {
+	goto loser;
+    }
+    if ((buf[2] != NSS_SIGN_CHK_MAJOR_VERSION) || 
+				(buf[3] < NSS_SIGN_CHK_MINOR_VERSION)) {
+	goto loser;
+    }
+#ifdef notdef
+    if (decodeInt(&buf[8]) != CKK_DSA) {
+	goto loser;
+    }
+#endif
+
+    /* seek past any future header extensions */
+    offset = decodeInt(&buf[4]);
+    PR_Seek(checkFD, offset, PR_SEEK_SET);
+
+    /* read the key */
+    rv = readItem(checkFD,&key.params.prime);
+    if (rv != SECSuccess) {
+	goto loser;
+    }
+    rv = readItem(checkFD,&key.params.subPrime);
+    if (rv != SECSuccess) {
+	goto loser;
+    }
+    rv = readItem(checkFD,&key.params.base);
+    if (rv != SECSuccess) {
+	goto loser;
+    }
+    rv = readItem(checkFD,&key.publicValue);
+    if (rv != SECSuccess) {
+	goto loser;
+    }
+    /* read the siganture */
+    rv = readItem(checkFD,&signature);
+    if (rv != SECSuccess) {
+	goto loser;
+    }
+
+    /* done with the check file */
+    PR_Close(checkFD);
+    checkFD = NULL;
+
+    hashObj = HASH_GetRawHashObject(PQG_GetHashType(&key.params));
+    if (hashObj == NULL) {
+	goto loser;
+    }
+
+    /* open our library file */
+#ifdef FREEBL_USE_PRELINK
+    shFD = bl_OpenUnPrelink(shName,&pid);
+#else
+    shFD = PR_Open(shName, PR_RDONLY, 0);
+#endif
+    if (shFD == NULL) {
+#ifdef DEBUG_SHVERIFY
+        fprintf(stderr, "Failed to open the library file %s: (%d, %d)\n",
+                shName, (int)PR_GetError(), (int)PR_GetOSError());
+#endif /* DEBUG_SHVERIFY */
+	goto loser;
+    }
+
+    /* hash our library file with SHA1 */
+    hashcx = hashObj->create();
+    if (hashcx == NULL) {
+	goto loser;
+    }
+    hashObj->begin(hashcx);
+
+    count = 0;
+    while ((bytesRead = PR_Read(shFD, buf, sizeof(buf))) > 0) {
+	hashObj->update(hashcx, buf, bytesRead);
+	count += bytesRead;
+    }
+#ifdef FREEBL_USE_PRELINK
+    bl_CloseUnPrelink(shFD, pid);
+#else
+    PR_Close(shFD);
+#endif
+    shFD = NULL;
+
+    hashObj->end(hashcx, hash.data, &hash.len, hash.len);
+
+
+    /* verify the hash against the check file */
+    if (DSA_VerifyDigest(&key, &signature, &hash) == SECSuccess) {
+	result = PR_TRUE;
+    }
+#ifdef DEBUG_SHVERIFY
+  {
+        int i,j;
+        fprintf(stderr,"File %s: %d bytes\n",shName, count);
+        fprintf(stderr,"  hash: %d bytes\n", hash.len);
+#define STEP 10
+        for (i=0; i < hash.len; i += STEP) {
+           fprintf(stderr,"   ");
+           for (j=0; j < STEP && (i+j) < hash.len; j++) {
+                fprintf(stderr," %02x", hash.data[i+j]);
+           }
+           fprintf(stderr,"\n");
+        }
+        fprintf(stderr,"  signature: %d bytes\n", signature.len);
+        for (i=0; i < signature.len; i += STEP) {
+           fprintf(stderr,"   ");
+           for (j=0; j < STEP && (i+j) < signature.len; j++) {
+                fprintf(stderr," %02x", signature.data[i+j]);
+           }
+           fprintf(stderr,"\n");
+        }
+	fprintf(stderr,"Verified : %s\n",result?"TRUE": "FALSE");
+    }
+#endif /* DEBUG_SHVERIFY */
+
+
+loser:
+    if (checkName != NULL) {
+	PORT_Free(checkName);
+    }
+    if (checkFD != NULL) {
+	PR_Close(checkFD);
+    }
+    if (shFD != NULL) {
+	PR_Close(shFD);
+    }
+    if (hashcx != NULL) {
+	if (hashObj) {
+	    hashObj->destroy(hashcx,PR_TRUE);
+	}
+    }
+    if (signature.data != NULL) {
+	PORT_Free(signature.data);
+    }
+    if (key.params.prime.data != NULL) {
+	PORT_Free(key.params.prime.data);
+    }
+    if (key.params.subPrime.data != NULL) {
+	PORT_Free(key.params.subPrime.data);
+    }
+    if (key.params.base.data != NULL) {
+	PORT_Free(key.params.base.data);
+    }
+    if (key.publicValue.data != NULL) {
+	PORT_Free(key.publicValue.data);
+    }
+
+    return result;
+}
+
+PRBool
+BLAPI_VerifySelf(const char *name)
+{
+    if (name == NULL) {
+	/*
+	 * If name is NULL, freebl is statically linked into softoken.
+	 * softoken will call BLAPI_SHVerify next to verify itself.
+	 */
+	return PR_TRUE;
+    }
+    return BLAPI_SHVerify(name, (PRFuncPtr) decodeInt);
+}