3ca8e68f58
the secrets file to be readable by other users. Added to support the Windows port under cygwin. Problem reported by Martin Krumpolec krumpo@pobox.sk
287 lines
6.7 KiB
C
287 lines
6.7 KiB
C
/*
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Copyright (C) Andrew Tridgell 1998
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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/* support rsync authentication */
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#include "rsync.h"
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/***************************************************************************
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encode a buffer using base64 - simple and slow algorithm. null terminates
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the result.
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***************************************************************************/
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static void base64_encode(char *buf, int len, char *out)
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{
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char *b64 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
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int bit_offset, byte_offset, idx, i;
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unsigned char *d = (unsigned char *)buf;
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int bytes = (len*8 + 5)/6;
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memset(out, 0, bytes+1);
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for (i=0;i<bytes;i++) {
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byte_offset = (i*6)/8;
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bit_offset = (i*6)%8;
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if (bit_offset < 3) {
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idx = (d[byte_offset] >> (2-bit_offset)) & 0x3F;
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} else {
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idx = (d[byte_offset] << (bit_offset-2)) & 0x3F;
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if (byte_offset+1 < len) {
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idx |= (d[byte_offset+1] >> (8-(bit_offset-2)));
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}
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}
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out[i] = b64[idx];
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}
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}
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/* create a 16 byte challenge buffer */
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static void gen_challenge(char *addr, char *challenge)
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{
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char input[32];
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struct timeval tv;
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memset(input, 0, sizeof(input));
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strlcpy((char *)input, addr, 17);
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gettimeofday(&tv, NULL);
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SIVAL(input, 16, tv.tv_sec);
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SIVAL(input, 20, tv.tv_usec);
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SIVAL(input, 24, getpid());
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sum_init();
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sum_update(input, sizeof(input));
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sum_end(challenge);
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}
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/* return the secret for a user from the sercret file. maximum length
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is len. null terminate it */
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static int get_secret(int module, char *user, char *secret, int len)
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{
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char *fname = lp_secrets_file(module);
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int fd, found=0;
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char line[MAXPATHLEN];
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char *p, *pass=NULL;
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STRUCT_STAT st;
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int ok = 1;
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extern int am_root;
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if (!fname || !*fname) return 0;
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fd = open(fname,O_RDONLY);
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if (fd == -1) return 0;
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if (do_stat(fname, &st) == -1) {
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rprintf(FERROR,"stat(%s) : %s\n", fname, strerror(errno));
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ok = 0;
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} else if (lp_strict_modes(module)) {
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if ((st.st_mode & 06) != 0) {
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rprintf(FERROR,"secrets file must not be other-accessible (see strict modes option)\n");
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ok = 0;
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} else if (am_root && (st.st_uid != 0)) {
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rprintf(FERROR,"secrets file must be owned by root when running as root (see strict modes)\n");
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ok = 0;
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}
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}
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if (!ok) {
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rprintf(FERROR,"continuing without secrets file\n");
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close(fd);
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return 0;
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}
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while (!found) {
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int i = 0;
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memset(line, 0, sizeof(line));
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while (i<(sizeof(line)-1)) {
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if (read(fd, &line[i], 1) != 1) {
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memset(line, 0, sizeof(line));
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close(fd);
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return 0;
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}
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if (line[i] == '\r') continue;
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if (line[i] == '\n') break;
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i++;
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}
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line[i] = 0;
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if (line[0] == '#') continue;
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p = strchr(line,':');
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if (!p) continue;
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*p = 0;
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if (strcmp(user, line)) continue;
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pass = p+1;
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found = 1;
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}
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close(fd);
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if (!found) return 0;
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strlcpy(secret, pass, len);
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return 1;
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}
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static char *getpassf(char *filename)
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{
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char buffer[100];
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int len=0;
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int fd=0;
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STRUCT_STAT st;
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int ok = 1;
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extern int am_root;
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char *envpw=getenv("RSYNC_PASSWORD");
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if (!filename) return NULL;
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if ( (fd=open(filename,O_RDONLY)) == -1) {
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rprintf(FERROR,"could not open password file \"%s\"\n",filename);
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if (envpw) rprintf(FERROR,"falling back to RSYNC_PASSWORD environment variable.\n");
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return NULL;
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}
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if (do_stat(filename, &st) == -1) {
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rprintf(FERROR,"stat(%s) : %s\n", filename, strerror(errno));
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ok = 0;
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} else if ((st.st_mode & 06) != 0) {
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rprintf(FERROR,"password file must not be other-accessible\n");
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ok = 0;
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} else if (am_root && (st.st_uid != 0)) {
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rprintf(FERROR,"password file must be owned by root when running as root\n");
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ok = 0;
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}
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if (!ok) {
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rprintf(FERROR,"continuing without password file\n");
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if (envpw) rprintf(FERROR,"using RSYNC_PASSWORD environment variable.\n");
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close(fd);
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return NULL;
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}
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if (envpw) rprintf(FERROR,"RSYNC_PASSWORD environment variable ignored\n");
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buffer[sizeof(buffer)-1]='\0';
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if ( (len=read(fd,buffer,sizeof(buffer)-1)) > 0)
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{
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char *p = strtok(buffer,"\n\r");
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close(fd);
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if (p) p = strdup(p);
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return p;
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}
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return NULL;
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}
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/* generate a 16 byte hash from a password and challenge */
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static void generate_hash(char *in, char *challenge, char *out)
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{
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char buf[16];
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sum_init();
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sum_update(in, strlen(in));
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sum_update(challenge, strlen(challenge));
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sum_end(buf);
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base64_encode(buf, 16, out);
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}
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/* possible negotiate authentication with the client. Use "leader" to
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start off the auth if necessary
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return NULL if authentication failed
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return "" if anonymous access
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otherwise return username
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*/
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char *auth_server(int fd, int module, char *addr, char *leader)
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{
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char *users = lp_auth_users(module);
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char challenge[16];
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char b64_challenge[30];
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char line[MAXPATHLEN];
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static char user[100];
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char secret[100];
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char pass[30];
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char pass2[30];
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char *tok;
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/* if no auth list then allow anyone in! */
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if (!users || !*users) return "";
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gen_challenge(addr, challenge);
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base64_encode(challenge, 16, b64_challenge);
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io_printf(fd,"%s%s\n", leader, b64_challenge);
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if (!read_line(fd, line, sizeof(line)-1)) {
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return NULL;
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}
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memset(user, 0, sizeof(user));
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memset(pass, 0, sizeof(pass));
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if (sscanf(line,"%99s %29s", user, pass) != 2) {
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return NULL;
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}
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users = strdup(users);
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if (!users) return NULL;
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for (tok=strtok(users," ,\t"); tok; tok = strtok(NULL," ,\t")) {
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if (strcmp(tok, user) == 0) break;
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}
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free(users);
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if (!tok) {
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return NULL;
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}
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memset(secret, 0, sizeof(secret));
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if (!get_secret(module, user, secret, sizeof(secret)-1)) {
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memset(secret, 0, sizeof(secret));
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return NULL;
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}
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generate_hash(secret, b64_challenge, pass2);
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memset(secret, 0, sizeof(secret));
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if (strcmp(pass, pass2) == 0)
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return user;
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return NULL;
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}
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void auth_client(int fd, char *user, char *challenge)
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{
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char *pass;
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char pass2[30];
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extern char *password_file;
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if (!user || !*user) return;
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if (!(pass=getpassf(password_file)) && !(pass=getenv("RSYNC_PASSWORD"))) {
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pass = getpass("Password: ");
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}
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if (!pass || !*pass) {
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pass = "";
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}
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generate_hash(pass, challenge, pass2);
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io_printf(fd, "%s %s\n", user, pass2);
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}
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