/*
- * Copyright (c) 2000 Damien Miller. All rights reserved.
+ * Copyright (c) 2001 Damien Miller. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* 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. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by Markus Friedl.
- * 4. 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 ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
#include "includes.h"
-#include "ssh.h"
-#include "xmalloc.h"
-
-#include <openssl/rand.h>
-#include <openssl/sha.h>
-
-RCSID("$Id$");
+#include <sys/types.h>
+#include <sys/wait.h>
-#ifdef EGD_SOCKET
-#ifndef offsetof
-# define offsetof(type, member) ((size_t) &((type *)0)->member)
+#ifdef HAVE_SYS_STAT_H
+# include <sys/stat.h>
#endif
-/* Collect entropy from EGD */
-void get_random_bytes(unsigned char *buf, int len)
-{
- static int egd_socket = -1;
- int c;
- char egd_message[2] = { 0x02, 0x00 };
- struct sockaddr_un addr;
- int addr_len;
-
- memset(&addr, '\0', sizeof(addr));
- addr.sun_family = AF_UNIX;
-
- /* FIXME: compile time check? */
- if (sizeof(EGD_SOCKET) > sizeof(addr.sun_path))
- fatal("Random pool path is too long");
-
- strcpy(addr.sun_path, EGD_SOCKET);
-
- addr_len = offsetof(struct sockaddr_un, sun_path) + sizeof(EGD_SOCKET);
-
- if (egd_socket == -1) {
- egd_socket = socket(AF_UNIX, SOCK_STREAM, 0);
- if (egd_socket == -1)
- fatal("Couldn't create AF_UNIX socket: %s", strerror(errno));
- if (connect(egd_socket, (struct sockaddr*)&addr, addr_len) == -1)
- fatal("Couldn't connect to EGD socket \"%s\": %s", addr.sun_path, strerror(errno));
- }
-
- if (len > 255)
- fatal("Too many bytes to read from EGD");
-
- /* Send blocking read request to EGD */
- egd_message[1] = len;
- c = atomicio(write, egd_socket, egd_message, sizeof(egd_message));
- if (c == -1)
- fatal("Couldn't write to EGD socket \"%s\": %s", EGD_SOCKET, strerror(errno));
+#ifdef HAVE_FCNTL_H
+# include <fcntl.h>
+#endif
+#include <stdarg.h>
+#include <string.h>
+#include <signal.h>
+#include <unistd.h>
- c = atomicio(read, egd_socket, buf, len);
- if (c <= 0)
- fatal("Couldn't read from EGD socket \"%s\": %s", EGD_SOCKET, strerror(errno));
-
- close(EGD_SOCKET);
-}
-#else /* !EGD_SOCKET */
-#ifdef RANDOM_POOL
-/* Collect entropy from /dev/urandom or pipe */
-void get_random_bytes(unsigned char *buf, int len)
-{
- static int random_pool = -1;
- int c;
+#include <openssl/rand.h>
+#include <openssl/crypto.h>
+#include <openssl/err.h>
- if (random_pool == -1) {
- random_pool = open(RANDOM_POOL, O_RDONLY);
- if (random_pool == -1)
- fatal("Couldn't open random pool \"%s\": %s", RANDOM_POOL, strerror(errno));
- }
-
- c = atomicio(read, random_pool, buf, len);
- if (c <= 0)
- fatal("Couldn't read from random pool \"%s\": %s", RANDOM_POOL, strerror(errno));
-}
-#endif /* RANDOM_POOL */
-#endif /* EGD_SOCKET */
+#include "ssh.h"
+#include "misc.h"
+#include "xmalloc.h"
+#include "atomicio.h"
+#include "pathnames.h"
+#include "log.h"
+#include "buffer.h"
-#if !defined(EGD_SOCKET) && !defined(RANDOM_POOL)
-/*
- * FIXME: proper entropy estimations. All current values are guesses
- * FIXME: (ATL) do estimates at compile time?
- * FIXME: More entropy sources
+/*
+ * Portable OpenSSH PRNG seeding:
+ * If OpenSSL has not "internally seeded" itself (e.g. pulled data from
+ * /dev/random), then we execute a "ssh-rand-helper" program which
+ * collects entropy and writes it to stdout. The child program must
+ * write at least RANDOM_SEED_SIZE bytes. The child is run with stderr
+ * attached, so error/debugging output should be visible.
+ *
+ * XXX: we should tell the child how many bytes we need.
*/
-/* slow command timeouts (all in milliseconds) */
-/* static int entropy_timeout_default = ENTROPY_TIMEOUT_MSEC; */
-static int entropy_timeout_current = ENTROPY_TIMEOUT_MSEC;
-
-static int prng_seed_loaded = 0;
-static int prng_seed_saved = 0;
-static int prng_commands_loaded = 0;
-
-typedef struct
-{
- /* Proportion of data that is entropy */
- double rate;
- /* Counter goes positive if this command times out */
- unsigned int badness;
- /* Increases by factor of two each timeout */
- unsigned int sticky_badness;
- /* Path to executable */
- char *path;
- /* argv to pass to executable */
- char *args[5];
-} entropy_source_t;
-
-double stir_from_system(void);
-double stir_from_programs(void);
-double stir_gettimeofday(double entropy_estimate);
-double stir_clock(double entropy_estimate);
-double stir_rusage(int who, double entropy_estimate);
-double hash_output_from_command(entropy_source_t *src, char *hash);
-
-/* this is initialised from a file, by prng_read_commands() */
-entropy_source_t *entropy_sources = NULL;
-#define MIN_ENTROPY_SOURCES 16
-
-
-double
-stir_from_system(void)
-{
- double total_entropy_estimate;
- long int i;
-
- total_entropy_estimate = 0;
-
- i = getpid();
- RAND_add(&i, sizeof(i), 0.1);
- total_entropy_estimate += 0.1;
-
- i = getppid();
- RAND_add(&i, sizeof(i), 0.1);
- total_entropy_estimate += 0.1;
-
- i = getuid();
- RAND_add(&i, sizeof(i), 0.0);
- i = getgid();
- RAND_add(&i, sizeof(i), 0.0);
-
- total_entropy_estimate += stir_gettimeofday(1.0);
- total_entropy_estimate += stir_clock(0.2);
- total_entropy_estimate += stir_rusage(RUSAGE_SELF, 2.0);
-
- return(total_entropy_estimate);
-}
-
-double
-stir_from_programs(void)
-{
- int i;
- int c;
- double entropy_estimate;
- double total_entropy_estimate;
- char hash[SHA_DIGEST_LENGTH];
-
- /*
- * Run through list of programs twice to catch differences
- */
- total_entropy_estimate = 0;
- for(i = 0; i < 2; i++) {
- c = 0;
- while (entropy_sources[c].path != NULL) {
-
- if (!entropy_sources[c].badness) {
- /* Hash output from command */
- entropy_estimate = hash_output_from_command(&entropy_sources[c], hash);
-
- /* Scale back entropy estimate according to command's rate */
- entropy_estimate *= entropy_sources[c].rate;
-
- /* Upper bound of entropy estimate is SHA_DIGEST_LENGTH */
- if (entropy_estimate > SHA_DIGEST_LENGTH)
- entropy_estimate = SHA_DIGEST_LENGTH;
-
- /* * Scale back estimates for subsequent passes through list */
- entropy_estimate /= 10.0 * (i + 1.0);
-
- /* Stir it in */
- RAND_add(hash, sizeof(hash), entropy_estimate);
-
-/* FIXME: turn this off later */
-#if 1
- debug("Got %0.2f bytes of entropy from %s", entropy_estimate,
- entropy_sources[c].path);
+#ifndef OPENSSL_PRNG_ONLY
+#define RANDOM_SEED_SIZE 48
+static uid_t original_uid, original_euid;
#endif
- total_entropy_estimate += entropy_estimate;
-
- /* Execution times should be a little unpredictable */
- total_entropy_estimate += stir_gettimeofday(0.05);
- total_entropy_estimate += stir_clock(0.05);
- total_entropy_estimate += stir_rusage(RUSAGE_SELF, 0.1);
- total_entropy_estimate += stir_rusage(RUSAGE_CHILDREN, 0.1);
- } else {
-/* FIXME: turn this off later */
-#if 1
- debug("Command '%s %s %s' disabled (badness %d)",
- entropy_sources[c].path, entropy_sources[c].args[1],
- entropy_sources[c].args[2], entropy_sources[c].badness);
-#endif
-
- if (entropy_sources[c].badness > 0)
- entropy_sources[c].badness--;
- }
-
- c++;
- }
- }
-
- return(total_entropy_estimate);
-}
-
-double
-stir_gettimeofday(double entropy_estimate)
-{
- struct timeval tv;
-
- if (gettimeofday(&tv, NULL) == -1)
- fatal("Couldn't gettimeofday: %s", strerror(errno));
-
- RAND_add(&tv, sizeof(tv), entropy_estimate);
-
- return(entropy_estimate);
-}
-
-double
-stir_clock(double entropy_estimate)
-{
-#ifdef HAVE_CLOCK
- clock_t c;
-
- c = clock();
- RAND_add(&c, sizeof(c), entropy_estimate);
-
- return(entropy_estimate);
-#else /* _HAVE_CLOCK */
- return(0);
-#endif /* _HAVE_CLOCK */
-}
-
-double
-stir_rusage(int who, double entropy_estimate)
-{
-#ifdef HAVE_GETRUSAGE
- struct rusage ru;
-
- if (getrusage(who, &ru) == -1)
- fatal("Couldn't getrusage: %s", strerror(errno));
-
- RAND_add(&ru, sizeof(ru), 0.1);
-
- return(entropy_estimate);
-#else /* _HAVE_GETRUSAGE */
- return(0);
-#endif /* _HAVE_GETRUSAGE */
-}
-
-double
-hash_output_from_command(entropy_source_t *src, char *hash)
+void
+seed_rng(void)
{
- static int devnull = -1;
+#ifndef OPENSSL_PRNG_ONLY
+ int devnull;
int p[2];
- fd_set rdset;
- int cmd_eof = 0, error_abort = 0;
pid_t pid;
- int status;
- char buf[2048];
- int bytes_read;
- int total_bytes_read;
- SHA_CTX sha;
-
- if (devnull == -1) {
- devnull = open("/dev/null", O_RDWR);
- if (devnull == -1)
- fatal("Couldn't open /dev/null: %s", strerror(errno));
- }
-
- if (pipe(p) == -1)
- fatal("Couldn't open pipe: %s", strerror(errno));
-
- switch (pid = fork()) {
- case -1: /* Error */
- close(p[0]);
- close(p[1]);
- fatal("Couldn't fork: %s", strerror(errno));
- /* NOTREACHED */
- case 0: /* Child */
- dup2(devnull, STDIN_FILENO);
- dup2(p[1], STDOUT_FILENO);
- dup2(p[1], STDERR_FILENO);
- close(p[0]);
- close(p[1]);
- close(devnull);
-
- execv(src->path, (char**)(src->args));
- debug("(child) Couldn't exec '%s %s %s': %s", src->path,
- src->args[1], src->args[2], strerror(errno));
- src->badness = src->sticky_badness = 128;
- _exit(-1);
- default: /* Parent */
- break;
- }
-
- RAND_add(&pid, sizeof(&pid), 0.0);
-
- close(p[1]);
+ int ret;
+ unsigned char buf[RANDOM_SEED_SIZE];
+ mysig_t old_sigchld;
- /* Hash output from child */
- SHA1_Init(&sha);
- total_bytes_read = 0;
-
- while (!error_abort && !cmd_eof) {
- int ret;
- struct timeval tv;
-
- FD_ZERO(&rdset);
- FD_SET(p[0], &rdset);
- tv.tv_sec = entropy_timeout_current / 1000;
- tv.tv_usec = (entropy_timeout_current % 1000) * 1000;
-
- ret = select(p[0]+1, &rdset, NULL, NULL, &tv);
- switch (ret) {
- case 0:
- /* timer expired */
- error_abort = 1;
- break;
-
- case 1:
- /* command input */
- bytes_read = read(p[0], buf, sizeof(buf));
- if (bytes_read == -1) {
- error_abort = 1;
- break;
- }
- SHA1_Update(&sha, buf, bytes_read);
- total_bytes_read += bytes_read;
- RAND_add(&bytes_read, sizeof(&bytes_read), 0.0);
- cmd_eof = bytes_read ? 0 : 1;
-
- break;
-
- case -1:
- default:
- error("Command '%s %s': select() failed: %s", src->path, src->args[1],
- strerror(errno));
- error_abort = 1;
- break;
- } /* switch ret */
-
- RAND_add(&tv, sizeof(&tv), 0.0);
- } /* while !error_abort && !cmd_eof */
-
- SHA1_Final(hash, &sha);
-
- close(p[0]);
-
- if (waitpid(pid, &status, 0) == -1) {
- error("Couldn't wait for child '%s %s' completion: %s", src->path,
- src->args[1], strerror(errno));
- /* return(-1); */ /* FIXME: (ATL) this doesn't feel right */
- return(0.0);
+ if (RAND_status() == 1) {
+ debug3("RNG is ready, skipping seeding");
+ return;
}
- RAND_add(&status, sizeof(&status), 0.0);
-
- if (error_abort) {
- /* closing p[0] on timeout causes the entropy command to
- * SIGPIPE. Take whatever output we got, and mark this command
- * as slow */
- debug("Command %s %s timed out", src->path, src->args[1]);
- src->sticky_badness *= 2;
- src->badness = src->sticky_badness;
- return(total_bytes_read);
- }
+ debug3("Seeding PRNG from %s", SSH_RAND_HELPER);
- if (WIFEXITED(status)) {
- if (WEXITSTATUS(status)==0) {
- return(total_bytes_read);
- } else {
- debug("Exit status was %d", WEXITSTATUS(status));
- src->badness = src->sticky_badness = 128;
- return (0.0);
+ if ((devnull = open("/dev/null", O_RDWR)) == -1)
+ fatal("Couldn't open /dev/null: %s", strerror(errno));
+ if (pipe(p) == -1)
+ fatal("pipe: %s", strerror(errno));
+
+ old_sigchld = signal(SIGCHLD, SIG_DFL);
+ if ((pid = fork()) == -1)
+ fatal("Couldn't fork: %s", strerror(errno));
+ if (pid == 0) {
+ dup2(devnull, STDIN_FILENO);
+ dup2(p[1], STDOUT_FILENO);
+ /* Keep stderr open for errors */
+ close(p[0]);
+ close(p[1]);
+ close(devnull);
+
+ if (original_uid != original_euid &&
+ ( seteuid(getuid()) == -1 ||
+ setuid(original_uid) == -1) ) {
+ fprintf(stderr, "(rand child) setuid(%li): %s\n",
+ (long int)original_uid, strerror(errno));
+ _exit(1);
}
- } else if (WIFSIGNALED(status)) {
- debug("Returned on uncaught signal %d !", status);
- src->badness = src->sticky_badness = 128;
- return(0.0);
- } else
- return(0.0);
-}
-
-/*
- * prng seedfile functions
- */
-int
-prng_check_seedfile(char *filename) {
-
- struct stat st;
-
- /* FIXME raceable: eg replace seed between this stat and subsequent open */
- /* Not such a problem because we don't trust the seed file anyway */
- if (lstat(filename, &st) == -1) {
- /* Fail on hard errors */
- if (errno != ENOENT)
- fatal("Couldn't stat random seed file \"%s\": %s", filename,
- strerror(errno));
- return(0);
+ execl(SSH_RAND_HELPER, "ssh-rand-helper", NULL);
+ fprintf(stderr, "(rand child) Couldn't exec '%s': %s\n",
+ SSH_RAND_HELPER, strerror(errno));
+ _exit(1);
}
- /* regular file? */
- if (!S_ISREG(st.st_mode))
- fatal("PRNG seedfile %.100s is not a regular file", filename);
-
- /* mode 0600, owned by root or the current user? */
- if (((st.st_mode & 0177) != 0) || !(st.st_uid == geteuid()))
- fatal("PRNG seedfile %.100s must be mode 0600, owned by uid %d",
- filename, getuid());
-
- return(1);
-}
-
-void
-prng_write_seedfile(void) {
- int fd;
- char seed[1024];
- char filename[1024];
- struct passwd *pw;
+ close(devnull);
+ close(p[1]);
- /* Don't bother if we have already saved a seed */
- if (prng_seed_saved)
- return;
-
- prng_seed_saved = 1;
-
- pw = getpwuid(getuid());
- if (pw == NULL)
- fatal("Couldn't get password entry for current user (%i): %s",
- getuid(), strerror(errno));
-
- /* Try to ensure that the parent directory is there */
- snprintf(filename, sizeof(filename), "%.512s/%s", pw->pw_dir,
- SSH_USER_DIR);
- mkdir(filename, 0700);
+ memset(buf, '\0', sizeof(buf));
+ ret = atomicio(read, p[0], buf, sizeof(buf));
+ if (ret == -1)
+ fatal("Couldn't read from ssh-rand-helper: %s",
+ strerror(errno));
+ if (ret != sizeof(buf))
+ fatal("ssh-rand-helper child produced insufficient data");
- snprintf(filename, sizeof(filename), "%.512s/%s", pw->pw_dir,
- SSH_PRNG_SEED_FILE);
+ close(p[0]);
- debug("writing PRNG seed to file %.100s", filename);
+ if (waitpid(pid, &ret, 0) == -1)
+ fatal("Couldn't wait for ssh-rand-helper completion: %s",
+ strerror(errno));
+ signal(SIGCHLD, old_sigchld);
- RAND_bytes(seed, sizeof(seed));
+ /* We don't mind if the child exits upon a SIGPIPE */
+ if (!WIFEXITED(ret) &&
+ (!WIFSIGNALED(ret) || WTERMSIG(ret) != SIGPIPE))
+ fatal("ssh-rand-helper terminated abnormally");
+ if (WEXITSTATUS(ret) != 0)
+ fatal("ssh-rand-helper exit with exit status %d", ret);
- /* Don't care if the seed doesn't exist */
- prng_check_seedfile(filename);
-
- if ((fd = open(filename, O_WRONLY|O_TRUNC|O_CREAT, 0600)) == -1)
- fatal("couldn't access PRNG seedfile %.100s (%.100s)", filename,
- strerror(errno));
-
- if (atomicio(write, fd, &seed, sizeof(seed)) != sizeof(seed))
- fatal("problem writing PRNG seedfile %.100s (%.100s)", filename,
- strerror(errno));
+ RAND_add(buf, sizeof(buf), sizeof(buf));
+ memset(buf, '\0', sizeof(buf));
- close(fd);
+#endif /* OPENSSL_PRNG_ONLY */
+ if (RAND_status() != 1)
+ fatal("PRNG is not seeded");
}
void
-prng_read_seedfile(void) {
- int fd;
- char seed[1024];
- char filename[1024];
- struct passwd *pw;
-
- pw = getpwuid(getuid());
- if (pw == NULL)
- fatal("Couldn't get password entry for current user (%i): %s",
- getuid(), strerror(errno));
-
- snprintf(filename, sizeof(filename), "%.512s/%s", pw->pw_dir,
- SSH_PRNG_SEED_FILE);
-
- debug("loading PRNG seed from file %.100s", filename);
-
- if (!prng_check_seedfile(filename)) {
- verbose("Random seed file not found, creating new");
- prng_write_seedfile();
-
- /* Reseed immediatly */
- (void)stir_from_system();
- (void)stir_from_programs();
- return;
- }
-
- /* open the file and read in the seed */
- fd = open(filename, O_RDONLY);
- if (fd == -1)
- fatal("could not open PRNG seedfile %.100s (%.100s)", filename,
- strerror(errno));
-
- if (atomicio(read, fd, &seed, sizeof(seed)) != sizeof(seed)) {
- verbose("invalid or short read from PRNG seedfile %.100s - ignoring",
- filename);
- memset(seed, '\0', sizeof(seed));
- }
- close(fd);
-
- /* stir in the seed, with estimated entropy zero */
- RAND_add(&seed, sizeof(seed), 0.0);
-}
-
-
-/*
- * entropy command initialisation functions
- */
-#define WHITESPACE " \t\n"
-
-int
-prng_read_commands(char *cmdfilename)
+init_rng(void)
{
- FILE *f;
- char line[1024];
- char cmd[1024], path[256];
- double est;
- char *cp;
- int linenum;
- entropy_source_t *entcmd;
- int num_cmds = 64;
- int cur_cmd = 0;
-
- f = fopen(cmdfilename, "r");
- if (!f) {
- fatal("couldn't read entropy commands file %.100s: %.100s",
- cmdfilename, strerror(errno));
- }
-
- linenum = 0;
-
- entcmd = (entropy_source_t *)xmalloc(num_cmds * sizeof(entropy_source_t));
- memset(entcmd, '\0', num_cmds * sizeof(entropy_source_t));
-
- while (fgets(line, sizeof(line), f)) {
- linenum++;
-
- /* skip leading whitespace, test for blank line or comment */
- cp = line + strspn(line, WHITESPACE);
- if ((*cp == 0) || (*cp == '#'))
- continue; /* done with this line */
-
- switch (*cp) {
- int arg;
- char *argv;
-
- case '"':
- /* first token, command args (incl. argv[0]) in double quotes */
- cp = strtok(cp, "\"");
- if (cp==NULL) {
- error("missing or bad command string, %.100s line %d -- ignored",
- cmdfilename, linenum);
- continue;
- }
- strncpy(cmd, cp, sizeof(cmd));
- /* second token, full command path */
- if ((cp = strtok(NULL, WHITESPACE)) == NULL) {
- error("missing command path, %.100s line %d -- ignored",
- cmdfilename, linenum);
- continue;
- }
- if (strncmp("undef", cp, 5)==0) /* did configure mark this as dead? */
- continue;
-
- strncpy(path, cp, sizeof(path));
- /* third token, entropy rate estimate for this command */
- if ( (cp = strtok(NULL, WHITESPACE)) == NULL) {
- error("missing entropy estimate, %.100s line %d -- ignored",
- cmdfilename, linenum);
- continue;
- }
- est = strtod(cp, &argv);/* FIXME: (ATL) no error checking here */
-
- /* end of line */
- if ((cp = strtok(NULL, WHITESPACE)) != NULL) {
- error("garbage at end of line %d in %.100s -- ignored",
- linenum, cmdfilename);
- continue;
- }
-
- /* split the command args */
- cp = strtok(cmd, WHITESPACE);
- arg = 0; argv = NULL;
- do {
- char *s = (char*)xmalloc(strlen(cp)+1);
- strncpy(s, cp, strlen(cp)+1);
- entcmd[cur_cmd].args[arg] = s;
- arg++;
- } while ((arg < 5) && (cp = strtok(NULL, WHITESPACE)));
- if (strtok(NULL, WHITESPACE))
- error("ignored extra command elements (max 5), %.100s line %d",
- cmdfilename, linenum);
-
- /* copy the command path and rate estimate */
- entcmd[cur_cmd].path = (char *)xmalloc(strlen(path)+1);
- strncpy(entcmd[cur_cmd].path, path, strlen(path)+1);
- entcmd[cur_cmd].rate = est;
- /* initialise other values */
- entcmd[cur_cmd].sticky_badness = 1;
-
- cur_cmd++;
-
- /* If we've filled the array, reallocate it twice the size */
- /* Do this now because even if this we're on the last command,
- we need another slot to mark the last entry */
- if (cur_cmd == num_cmds) {
- num_cmds *= 2;
- entcmd = xrealloc(entcmd, num_cmds * sizeof(entropy_source_t));
- }
- break;
-
- default:
- error("bad entropy command, %.100s line %d", cmdfilename,
- linenum);
- continue;
- }
- }
-
- /* zero the last entry */
- memset(&entcmd[cur_cmd], '\0', sizeof(entropy_source_t));
- /* trim to size */
- entropy_sources = xrealloc(entcmd, (cur_cmd+1) * sizeof(entropy_source_t));
-
- debug("loaded %d entropy commands from %.100s", cur_cmd, cmdfilename);
-
- return (cur_cmd >= MIN_ENTROPY_SOURCES);
-}
-
-
-#endif /* defined(EGD_SOCKET) || defined(RANDOM_POOL) */
-
-#if defined(EGD_SOCKET) || defined(RANDOM_POOL)
+ /*
+ * OpenSSL version numbers: MNNFFPPS: major minor fix patch status
+ * We match major, minor, fix and status (not patch)
+ */
+ if ((SSLeay() ^ OPENSSL_VERSION_NUMBER) & ~0xff0L)
+ fatal("OpenSSL version mismatch. Built against %lx, you "
+ "have %lx", OPENSSL_VERSION_NUMBER, SSLeay());
-/*
- * Seed OpenSSL's random number pool from Kernel random number generator
- * or EGD
- */
-void
-seed_rng(void)
-{
- char buf[32];
-
- debug("Seeding random number generator");
- get_random_bytes(buf, sizeof(buf));
- RAND_add(buf, sizeof(buf), sizeof(buf));
- memset(buf, '\0', sizeof(buf));
+#ifndef OPENSSL_PRNG_ONLY
+ original_uid = getuid();
+ original_euid = geteuid();
+#endif
}
-#else /* defined(EGD_SOCKET) || defined(RANDOM_POOL) */
-
-/*
- * Write a keyfile at exit
- */
+#ifndef OPENSSL_PRNG_ONLY
void
-prng_seed_cleanup(void *junk)
+rexec_send_rng_seed(Buffer *m)
{
- prng_write_seedfile();
+ u_char buf[RANDOM_SEED_SIZE];
+
+ if (RAND_bytes(buf, sizeof(buf)) <= 0) {
+ error("Couldn't obtain random bytes (error %ld)",
+ ERR_get_error());
+ buffer_put_string(m, "", 0);
+ } else
+ buffer_put_string(m, buf, sizeof(buf));
}
-/*
- * Conditionally Seed OpenSSL's random number pool from
- * syscalls and program output
- */
void
-seed_rng(void)
+rexec_recv_rng_seed(Buffer *m)
{
- if (!prng_commands_loaded) {
- if (!prng_read_commands(SSH_PRNG_COMMAND_FILE))
- fatal("PRNG initialisation failed -- exiting.");
- prng_commands_loaded = 1;
- }
+ u_char *buf;
+ u_int len;
- debug("Seeding random number generator.");
- debug("OpenSSL random status is now %i\n", RAND_status());
- debug("%i bytes from system calls", (int)stir_from_system());
- debug("%i bytes from programs", (int)stir_from_programs());
- debug("OpenSSL random status is now %i\n", RAND_status());
-
- if (!prng_seed_loaded)
- {
- prng_seed_loaded = 1;
- prng_seed_saved = 0;
- prng_read_seedfile();
- fatal_add_cleanup(prng_seed_cleanup, NULL);
- atexit(prng_write_seedfile);
+ buf = buffer_get_string_ret(m, &len);
+ if (buf != NULL) {
+ debug3("rexec_recv_rng_seed: seeding rng with %u bytes", len);
+ RAND_add(buf, len, len);
}
}
-#endif /* defined(EGD_SOCKET) || defined(RANDOM_POOL) */
+#endif