* Support rsync daemon authentication.
*
* Copyright (C) 1998-2000 Andrew Tridgell
- * Copyright (C) 2002-2007 Wayne Davison
+ * Copyright (C) 2002-2014 Wayne Davison
*
* This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 3 as
- * published by the Free Software Foundation.
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
*/
#include "rsync.h"
+#include "itypes.h"
+extern int read_only;
extern char *password_file;
/***************************************************************************
base64_encode(digest, len, challenge, 0);
}
+/* Generate an MD4 hash created from the combination of the password
+ * and the challenge string and return it base64-encoded. */
+static void generate_hash(const char *in, const char *challenge, char *out)
+{
+ char buf[MAX_DIGEST_LEN];
+ int len;
+
+ sum_init(0);
+ sum_update(in, strlen(in));
+ sum_update(challenge, strlen(challenge));
+ len = sum_end(buf);
+
+ base64_encode(buf, len, out, 0);
+}
/* Return the secret for a user from the secret file, null terminated.
* Maximum length is len (not counting the null). */
-static int get_secret(int module, const char *user, char *secret, int len)
+static const char *check_secret(int module, const char *user, const char *group,
+ const char *challenge, const char *pass)
{
+ char line[1024];
+ char pass2[MAX_DIGEST_LEN*2];
const char *fname = lp_secrets_file(module);
STRUCT_STAT st;
- int fd, ok = 1;
- const char *p;
- char ch, *s;
+ int ok = 1;
+ int user_len = strlen(user);
+ int group_len = group ? strlen(group) : 0;
+ char *err;
+ FILE *fh;
- if (!fname || !*fname)
- return 0;
+ if (!fname || !*fname || (fh = fopen(fname, "r")) == NULL)
+ return "no secrets file";
- if ((fd = open(fname, O_RDONLY)) < 0)
- return 0;
-
- if (do_stat(fname, &st) == -1) {
- rsyserr(FLOG, errno, "stat(%s)", fname);
+ if (do_fstat(fileno(fh), &st) == -1) {
+ rsyserr(FLOG, errno, "fstat(%s)", fname);
ok = 0;
} else if (lp_strict_modes(module)) {
if ((st.st_mode & 06) != 0) {
}
}
if (!ok) {
- rprintf(FLOG, "continuing without secrets file\n");
- close(fd);
- return 0;
+ fclose(fh);
+ return "ignoring secrets file";
}
if (*user == '#') {
/* Reject attempt to match a comment. */
- close(fd);
- return 0;
+ fclose(fh);
+ return "invalid username";
}
- /* Try to find a line that starts with the user name and a ':'. */
- p = user;
- while (1) {
- if (read(fd, &ch, 1) != 1) {
- close(fd);
- return 0;
+ /* Try to find a line that starts with the user (or @group) name and a ':'. */
+ err = "secret not found";
+ while ((user || group) && fgets(line, sizeof line, fh) != NULL) {
+ const char **ptr, *s = strtok(line, "\n\r");
+ int len;
+ if (!s)
+ continue;
+ if (*s == '@') {
+ ptr = &group;
+ len = group_len;
+ s++;
+ } else {
+ ptr = &user;
+ len = user_len;
}
- if (ch == '\n')
- p = user;
- else if (p) {
- if (*p == ch)
- p++;
- else if (!*p && ch == ':')
- break;
- else
- p = NULL;
+ if (!*ptr || strncmp(s, *ptr, len) != 0 || s[len] != ':')
+ continue;
+ generate_hash(s+len+1, challenge, pass2);
+ if (strcmp(pass, pass2) == 0) {
+ err = NULL;
+ break;
}
+ err = "password mismatch";
+ *ptr = NULL; /* Don't look for name again. */
}
- /* Slurp the secret into the "secret" buffer. */
- s = secret;
- while (len > 0) {
- if (read(fd, s, 1) != 1 || *s == '\n')
- break;
- if (*s == '\r')
- continue;
- s++;
- len--;
- }
- *s = '\0';
- close(fd);
+ fclose(fh);
+
+ memset(line, 0, sizeof line);
+ memset(pass2, 0, sizeof pass2);
- return 1;
+ return err;
}
static const char *getpassf(const char *filename)
{
STRUCT_STAT st;
char buffer[512], *p;
- int fd, n, ok = 1;
- const char *envpw = getenv("RSYNC_PASSWORD");
+ int n;
if (!filename)
return NULL;
- if ((fd = open(filename,O_RDONLY)) < 0) {
- rsyserr(FERROR, errno, "could not open password file \"%s\"",
- filename);
- if (envpw)
- rprintf(FERROR, "falling back to RSYNC_PASSWORD environment variable.\n");
- return NULL;
- }
+ if (strcmp(filename, "-") == 0) {
+ n = fgets(buffer, sizeof buffer, stdin) == NULL ? -1 : (int)strlen(buffer);
+ } else {
+ int fd;
- if (do_stat(filename, &st) == -1) {
- rsyserr(FERROR, errno, "stat(%s)", filename);
- ok = 0;
- } else if ((st.st_mode & 06) != 0) {
- rprintf(FERROR,"password file must not be other-accessible\n");
- ok = 0;
- } else if (MY_UID() == 0 && st.st_uid != 0) {
- rprintf(FERROR,"password file must be owned by root when running as root\n");
- ok = 0;
- }
- if (!ok) {
- rprintf(FERROR,"continuing without password file\n");
- if (envpw)
- rprintf(FERROR, "using RSYNC_PASSWORD environment variable.\n");
+ if ((fd = open(filename,O_RDONLY)) < 0) {
+ rsyserr(FERROR, errno, "could not open password file %s", filename);
+ exit_cleanup(RERR_SYNTAX);
+ }
+
+ if (do_stat(filename, &st) == -1) {
+ rsyserr(FERROR, errno, "stat(%s)", filename);
+ exit_cleanup(RERR_SYNTAX);
+ }
+ if ((st.st_mode & 06) != 0) {
+ rprintf(FERROR, "ERROR: password file must not be other-accessible\n");
+ exit_cleanup(RERR_SYNTAX);
+ }
+ if (MY_UID() == 0 && st.st_uid != 0) {
+ rprintf(FERROR, "ERROR: password file must be owned by root when running as root\n");
+ exit_cleanup(RERR_SYNTAX);
+ }
+
+ n = read(fd, buffer, sizeof buffer - 1);
close(fd);
- return NULL;
}
- if (envpw)
- rprintf(FERROR, "RSYNC_PASSWORD environment variable ignored\n");
-
- n = read(fd, buffer, sizeof buffer - 1);
- close(fd);
if (n > 0) {
buffer[n] = '\0';
if ((p = strtok(buffer, "\n\r")) != NULL)
return strdup(p);
}
- return NULL;
-}
-
-/* Generate an MD4 hash created from the combination of the password
- * and the challenge string and return it base64-encoded. */
-static void generate_hash(const char *in, const char *challenge, char *out)
-{
- char buf[MAX_DIGEST_LEN];
- int len;
-
- sum_init(0);
- sum_update(in, strlen(in));
- sum_update(challenge, strlen(challenge));
- len = sum_end(buf);
-
- base64_encode(buf, len, out, 0);
+ rprintf(FERROR, "ERROR: failed to read a password from %s\n", filename);
+ exit_cleanup(RERR_SYNTAX);
}
/* Possibly negotiate authentication with the client. Use "leader" to
char *users = lp_auth_users(module);
char challenge[MAX_DIGEST_LEN*2];
char line[BIGPATHBUFLEN];
- char secret[512];
- char pass2[MAX_DIGEST_LEN*2];
+ char **auth_uid_groups = NULL;
+ int auth_uid_groups_cnt = -1;
+ const char *err = NULL;
+ int group_match = -1;
char *tok, *pass;
+ char opt_ch = '\0';
/* if no auth list then allow anyone in! */
if (!users || !*users)
io_printf(f_out, "%s%s\n", leader, challenge);
- if (!read_line(f_in, line, sizeof line - 1)
+ if (!read_line_old(f_in, line, sizeof line, 0)
|| (pass = strchr(line, ' ')) == NULL) {
rprintf(FLOG, "auth failed on module %s from %s (%s): "
"invalid challenge response\n",
out_of_memory("auth_server");
for (tok = strtok(users, " ,\t"); tok; tok = strtok(NULL, " ,\t")) {
- if (wildmatch(tok, line))
- break;
+ char *opts;
+ /* See if the user appended :deny, :ro, or :rw. */
+ if ((opts = strchr(tok, ':')) != NULL) {
+ *opts++ = '\0';
+ opt_ch = isUpper(opts) ? toLower(opts) : *opts;
+ if (opt_ch == 'r') { /* handle ro and rw */
+ opt_ch = isUpper(opts+1) ? toLower(opts+1) : opts[1];
+ if (opt_ch == 'o')
+ opt_ch = 'r';
+ else if (opt_ch != 'w')
+ opt_ch = '\0';
+ } else if (opt_ch != 'd') /* if it's not deny, ignore it */
+ opt_ch = '\0';
+ } else
+ opt_ch = '\0';
+ if (*tok != '@') {
+ /* Match the username */
+ if (wildmatch(tok, line))
+ break;
+ } else {
+#ifdef HAVE_GETGROUPLIST
+ int j;
+ /* See if authorizing user is a real user, and if so, see
+ * if it is in a group that matches tok+1 wildmat. */
+ if (auth_uid_groups_cnt < 0) {
+ gid_t gid_list[64];
+ uid_t auth_uid;
+ auth_uid_groups_cnt = sizeof gid_list / sizeof (gid_t);
+ if (!user_to_uid(line, &auth_uid, False)
+ || getallgroups(auth_uid, gid_list, &auth_uid_groups_cnt) != NULL)
+ auth_uid_groups_cnt = 0;
+ else {
+ if ((auth_uid_groups = new_array(char *, auth_uid_groups_cnt)) == NULL)
+ out_of_memory("auth_server");
+ for (j = 0; j < auth_uid_groups_cnt; j++)
+ auth_uid_groups[j] = gid_to_group(gid_list[j]);
+ }
+ }
+ for (j = 0; j < auth_uid_groups_cnt; j++) {
+ if (auth_uid_groups[j] && wildmatch(tok+1, auth_uid_groups[j])) {
+ group_match = j;
+ break;
+ }
+ }
+ if (group_match >= 0)
+ break;
+#else
+ rprintf(FLOG, "your computer doesn't support getgrouplist(), so no @group authorization is possible.\n");
+#endif
+ }
}
+
free(users);
- if (!tok) {
- rprintf(FLOG, "auth failed on module %s from %s (%s): "
- "unauthorized user\n",
- lp_name(module), host, addr);
- return NULL;
+ if (!tok)
+ err = "no matching rule";
+ else if (opt_ch == 'd')
+ err = "denied by rule";
+ else {
+ char *group = group_match >= 0 ? auth_uid_groups[group_match] : NULL;
+ err = check_secret(module, line, group, challenge, pass);
}
- memset(secret, 0, sizeof secret);
- if (!get_secret(module, line, secret, sizeof secret - 1)) {
- memset(secret, 0, sizeof secret);
- rprintf(FLOG, "auth failed on module %s from %s (%s): "
- "missing secret for user \"%s\"\n",
- lp_name(module), host, addr, line);
- return NULL;
- }
+ memset(challenge, 0, sizeof challenge);
+ memset(pass, 0, strlen(pass));
- generate_hash(secret, challenge, pass2);
- memset(secret, 0, sizeof secret);
+ if (auth_uid_groups) {
+ int j;
+ for (j = 0; j < auth_uid_groups_cnt; j++) {
+ if (auth_uid_groups[j])
+ free(auth_uid_groups[j]);
+ }
+ free(auth_uid_groups);
+ }
- if (strcmp(pass, pass2) != 0) {
- rprintf(FLOG, "auth failed on module %s from %s (%s): "
- "password mismatch\n",
- lp_name(module), host, addr);
+ if (err) {
+ rprintf(FLOG, "auth failed on module %s from %s (%s) for %s: %s\n",
+ lp_name(module), host, addr, line, err);
return NULL;
}
+ if (opt_ch == 'r')
+ read_only = 1;
+ else if (opt_ch == 'w')
+ read_only = 0;
+
return strdup(line);
}
git.samba.org / rsync.git / blobdiff