From 8d033ec0d115fe2cdd9bf1fa9758cc0994f5b6f0 Mon Sep 17 00:00:00 2001 From: Jelmer Vernooij Date: Tue, 2 Jun 2009 23:07:59 +0200 Subject: Move mount.cifs/umount.cifs to the top level and remove the outdated copy in Samba 4. --- client/cifs.upcall.c | 391 +++++++++++++ client/cifs_spnego.h | 46 ++ client/mount.cifs.c | 1539 ++++++++++++++++++++++++++++++++++++++++++++++++++ client/mount.h | 38 ++ client/mtab.c | 220 ++++++++ client/umount.cifs.c | 405 +++++++++++++ 6 files changed, 2639 insertions(+) create mode 100644 client/cifs.upcall.c create mode 100644 client/cifs_spnego.h create mode 100644 client/mount.cifs.c create mode 100644 client/mount.h create mode 100644 client/mtab.c create mode 100644 client/umount.cifs.c (limited to 'client') diff --git a/client/cifs.upcall.c b/client/cifs.upcall.c new file mode 100644 index 0000000000..4110de35fd --- /dev/null +++ b/client/cifs.upcall.c @@ -0,0 +1,391 @@ +/* +* CIFS user-space helper. +* Copyright (C) Igor Mammedov (niallain@gmail.com) 2007 +* +* Used by /sbin/request-key for handling +* cifs upcall for kerberos authorization of access to share and +* cifs upcall for DFS srver name resolving (IPv4/IPv6 aware). +* You should have keyutils installed and add something like the +* following lines to /etc/request-key.conf file: + +create cifs.spnego * * /usr/local/sbin/cifs.upcall %k +create dns_resolver * * /usr/local/sbin/cifs.upcall %k + +* This program is free software; you can redistribute it and/or modify +* it under the terms of the GNU General Public License as published by +* the Free Software Foundation; either version 2 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 +* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +* GNU General Public License for more details. +* You should have received a copy of the GNU General Public License +* along with this program; if not, write to the Free Software +* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA +*/ + +#include "includes.h" +#include + +#include "cifs_spnego.h" + +const char *CIFSSPNEGO_VERSION = "1.2"; +static const char *prog = "cifs.upcall"; +typedef enum _secType { + NONE = 0, + KRB5, + MS_KRB5 +} secType_t; + +/* + * Prepares AP-REQ data for mechToken and gets session key + * Uses credentials from cache. It will not ask for password + * you should receive credentials for yuor name manually using + * kinit or whatever you wish. + * + * in: + * oid - string with OID/ Could be OID_KERBEROS5 + * or OID_KERBEROS5_OLD + * principal - Service name. + * Could be "cifs/FQDN" for KRB5 OID + * or for MS_KRB5 OID style server principal + * like "pdc$@YOUR.REALM.NAME" + * + * out: + * secblob - pointer for spnego wrapped AP-REQ data to be stored + * sess_key- pointer for SessionKey data to be stored + * + * ret: 0 - success, others - failure +*/ +static int +handle_krb5_mech(const char *oid, const char *principal, + DATA_BLOB * secblob, DATA_BLOB * sess_key) +{ + int retval; + DATA_BLOB tkt, tkt_wrapped; + + /* get a kerberos ticket for the service and extract the session key */ + retval = cli_krb5_get_ticket(principal, 0, + &tkt, sess_key, 0, NULL, NULL); + + if (retval) + return retval; + + /* wrap that up in a nice GSS-API wrapping */ + tkt_wrapped = spnego_gen_krb5_wrap(tkt, TOK_ID_KRB_AP_REQ); + + /* and wrap that in a shiny SPNEGO wrapper */ + *secblob = gen_negTokenInit(oid, tkt_wrapped); + + data_blob_free(&tkt_wrapped); + data_blob_free(&tkt); + return retval; +} + +#define DKD_HAVE_HOSTNAME 1 +#define DKD_HAVE_VERSION 2 +#define DKD_HAVE_SEC 4 +#define DKD_HAVE_IPV4 8 +#define DKD_HAVE_IPV6 16 +#define DKD_HAVE_UID 32 +#define DKD_MUSTHAVE_SET (DKD_HAVE_HOSTNAME|DKD_HAVE_VERSION|DKD_HAVE_SEC) + +static int +decode_key_description(const char *desc, int *ver, secType_t * sec, + char **hostname, uid_t * uid) +{ + int retval = 0; + char *pos; + const char *tkn = desc; + + do { + pos = index(tkn, ';'); + if (strncmp(tkn, "host=", 5) == 0) { + int len; + + if (pos == NULL) { + len = strlen(tkn); + } else { + len = pos - tkn; + } + len -= 4; + SAFE_FREE(*hostname); + *hostname = SMB_XMALLOC_ARRAY(char, len); + strlcpy(*hostname, tkn + 5, len); + retval |= DKD_HAVE_HOSTNAME; + } else if (strncmp(tkn, "ipv4=", 5) == 0) { + /* BB: do we need it if we have hostname already? */ + } else if (strncmp(tkn, "ipv6=", 5) == 0) { + /* BB: do we need it if we have hostname already? */ + } else if (strncmp(tkn, "sec=", 4) == 0) { + if (strncmp(tkn + 4, "krb5", 4) == 0) { + retval |= DKD_HAVE_SEC; + *sec = KRB5; + } else if (strncmp(tkn + 4, "mskrb5", 6) == 0) { + retval |= DKD_HAVE_SEC; + *sec = MS_KRB5; + } + } else if (strncmp(tkn, "uid=", 4) == 0) { + errno = 0; + *uid = strtol(tkn + 4, NULL, 16); + if (errno != 0) { + syslog(LOG_WARNING, "Invalid uid format: %s", + strerror(errno)); + return 1; + } else { + retval |= DKD_HAVE_UID; + } + } else if (strncmp(tkn, "ver=", 4) == 0) { /* if version */ + errno = 0; + *ver = strtol(tkn + 4, NULL, 16); + if (errno != 0) { + syslog(LOG_WARNING, + "Invalid version format: %s", + strerror(errno)); + return 1; + } else { + retval |= DKD_HAVE_VERSION; + } + } + if (pos == NULL) + break; + tkn = pos + 1; + } while (tkn); + return retval; +} + +static int +cifs_resolver(const key_serial_t key, const char *key_descr) +{ + int c; + struct addrinfo *addr; + char ip[INET6_ADDRSTRLEN]; + void *p; + const char *keyend = key_descr; + /* skip next 4 ';' delimiters to get to description */ + for (c = 1; c <= 4; c++) { + keyend = index(keyend+1, ';'); + if (!keyend) { + syslog(LOG_WARNING, "invalid key description: %s", + key_descr); + return 1; + } + } + keyend++; + + /* resolve name to ip */ + c = getaddrinfo(keyend, NULL, NULL, &addr); + if (c) { + syslog(LOG_WARNING, "unable to resolve hostname: %s [%s]", + keyend, gai_strerror(c)); + return 1; + } + + /* conver ip to string form */ + if (addr->ai_family == AF_INET) { + p = &(((struct sockaddr_in *)addr->ai_addr)->sin_addr); + } else { + p = &(((struct sockaddr_in6 *)addr->ai_addr)->sin6_addr); + } + if (!inet_ntop(addr->ai_family, p, ip, sizeof(ip))) { + syslog(LOG_WARNING, "%s: inet_ntop: %s", + __FUNCTION__, strerror(errno)); + freeaddrinfo(addr); + return 1; + } + + /* setup key */ + c = keyctl_instantiate(key, ip, strlen(ip)+1, 0); + if (c == -1) { + syslog(LOG_WARNING, "%s: keyctl_instantiate: %s", + __FUNCTION__, strerror(errno)); + freeaddrinfo(addr); + return 1; + } + + freeaddrinfo(addr); + return 0; +} + +static void +usage(void) +{ + syslog(LOG_WARNING, "Usage: %s [-c] [-v] key_serial", prog); + fprintf(stderr, "Usage: %s [-c] [-v] key_serial\n", prog); +} + +int main(const int argc, char *const argv[]) +{ + struct cifs_spnego_msg *keydata = NULL; + DATA_BLOB secblob = data_blob_null; + DATA_BLOB sess_key = data_blob_null; + secType_t sectype = NONE; + key_serial_t key = 0; + size_t datalen; + long rc = 1; + uid_t uid = 0; + int kernel_upcall_version = 0; + int c, use_cifs_service_prefix = 0; + char *buf, *hostname = NULL; + const char *oid; + + openlog(prog, 0, LOG_DAEMON); + + while ((c = getopt(argc, argv, "cv")) != -1) { + switch (c) { + case 'c':{ + use_cifs_service_prefix = 1; + break; + } + case 'v':{ + printf("version: %s\n", CIFSSPNEGO_VERSION); + goto out; + } + default:{ + syslog(LOG_WARNING, "unknown option: %c", c); + goto out; + } + } + } + + /* is there a key? */ + if (argc <= optind) { + usage(); + goto out; + } + + /* get key and keyring values */ + errno = 0; + key = strtol(argv[optind], NULL, 10); + if (errno != 0) { + key = 0; + syslog(LOG_WARNING, "Invalid key format: %s", strerror(errno)); + goto out; + } + + rc = keyctl_describe_alloc(key, &buf); + if (rc == -1) { + syslog(LOG_WARNING, "keyctl_describe_alloc failed: %s", + strerror(errno)); + rc = 1; + goto out; + } + + if ((strncmp(buf, "cifs.resolver", sizeof("cifs.resolver")-1) == 0) || + (strncmp(buf, "dns_resolver", sizeof("dns_resolver")-1) == 0)) { + rc = cifs_resolver(key, buf); + goto out; + } + + rc = decode_key_description(buf, &kernel_upcall_version, §ype, + &hostname, &uid); + if ((rc & DKD_MUSTHAVE_SET) != DKD_MUSTHAVE_SET) { + syslog(LOG_WARNING, + "unable to get from description necessary params"); + rc = 1; + SAFE_FREE(buf); + goto out; + } + SAFE_FREE(buf); + + if (kernel_upcall_version > CIFS_SPNEGO_UPCALL_VERSION) { + syslog(LOG_WARNING, + "incompatible kernel upcall version: 0x%x", + kernel_upcall_version); + rc = 1; + goto out; + } + + if (rc & DKD_HAVE_UID) { + rc = setuid(uid); + if (rc == -1) { + syslog(LOG_WARNING, "setuid: %s", strerror(errno)); + goto out; + } + } + + /* BB: someday upcall SPNEGO blob could be checked here to decide + * what mech to use */ + + // do mech specific authorization + switch (sectype) { + case MS_KRB5: + case KRB5:{ + char *princ; + size_t len; + + /* for "cifs/" service name + terminating 0 */ + len = strlen(hostname) + 5 + 1; + princ = SMB_XMALLOC_ARRAY(char, len); + if (!princ) { + rc = 1; + break; + } + if (use_cifs_service_prefix) { + strlcpy(princ, "cifs/", len); + } else { + strlcpy(princ, "host/", len); + } + strlcpy(princ + 5, hostname, len - 5); + + if (sectype == MS_KRB5) + oid = OID_KERBEROS5_OLD; + else + oid = OID_KERBEROS5; + + rc = handle_krb5_mech(oid, princ, &secblob, &sess_key); + SAFE_FREE(princ); + break; + } + default:{ + syslog(LOG_WARNING, "sectype: %d is not implemented", + sectype); + rc = 1; + break; + } + } + + if (rc) { + goto out; + } + + /* pack SecurityBLob and SessionKey into downcall packet */ + datalen = + sizeof(struct cifs_spnego_msg) + secblob.length + sess_key.length; + keydata = (struct cifs_spnego_msg*)SMB_XMALLOC_ARRAY(char, datalen); + if (!keydata) { + rc = 1; + goto out; + } + keydata->version = kernel_upcall_version; + keydata->flags = 0; + keydata->sesskey_len = sess_key.length; + keydata->secblob_len = secblob.length; + memcpy(&(keydata->data), sess_key.data, sess_key.length); + memcpy(&(keydata->data) + keydata->sesskey_len, + secblob.data, secblob.length); + + /* setup key */ + rc = keyctl_instantiate(key, keydata, datalen, 0); + if (rc == -1) { + syslog(LOG_WARNING, "keyctl_instantiate: %s", strerror(errno)); + goto out; + } + + /* BB: maybe we need use timeout for key: for example no more then + * ticket lifietime? */ + /* keyctl_set_timeout( key, 60); */ +out: + /* + * on error, negatively instantiate the key ourselves so that we can + * make sure the kernel doesn't hang it off of a searchable keyring + * and interfere with the next attempt to instantiate the key. + */ + if (rc != 0 && key == 0) + keyctl_negate(key, 1, KEY_REQKEY_DEFL_DEFAULT); + data_blob_free(&secblob); + data_blob_free(&sess_key); + SAFE_FREE(hostname); + SAFE_FREE(keydata); + return rc; +} diff --git a/client/cifs_spnego.h b/client/cifs_spnego.h new file mode 100644 index 0000000000..f8753a7d59 --- /dev/null +++ b/client/cifs_spnego.h @@ -0,0 +1,46 @@ +/* + * fs/cifs/cifs_spnego.h -- SPNEGO upcall management for CIFS + * + * Copyright (c) 2007 Red Hat, Inc. + * Author(s): Jeff Layton (jlayton@redhat.com) + * Steve French (sfrench@us.ibm.com) + * + * This library is free software; you can redistribute it and/or modify + * it under the terms of the GNU Lesser General Public License as published + * by the Free Software Foundation; either version 2.1 of the License, or + * (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See + * the GNU Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public License + * along with this library; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#ifndef _CIFS_SPNEGO_H +#define _CIFS_SPNEGO_H + +#define CIFS_SPNEGO_UPCALL_VERSION 2 + +/* + * The version field should always be set to CIFS_SPNEGO_UPCALL_VERSION. + * The flags field is for future use. The request-key callout should set + * sesskey_len and secblob_len, and then concatenate the SessKey+SecBlob + * and stuff it in the data field. + */ +struct cifs_spnego_msg { + uint32_t version; + uint32_t flags; + uint32_t sesskey_len; + uint32_t secblob_len; + uint8_t data[1]; +}; + +#ifdef __KERNEL__ +extern struct key_type cifs_spnego_key_type; +#endif /* KERNEL */ + +#endif /* _CIFS_SPNEGO_H */ diff --git a/client/mount.cifs.c b/client/mount.cifs.c new file mode 100644 index 0000000000..1b94486a1a --- /dev/null +++ b/client/mount.cifs.c @@ -0,0 +1,1539 @@ +/* + Mount helper utility for Linux CIFS VFS (virtual filesystem) client + Copyright (C) 2003,2008 Steve French (sfrench@us.ibm.com) + Copyright (C) 2008 Jeremy Allison (jra@samba.org) + + This program is free software; you can redistribute it and/or modify + 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 + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see . */ + +#ifndef _GNU_SOURCE +#define _GNU_SOURCE +#endif + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include "mount.h" + +#define MOUNT_CIFS_VERSION_MAJOR "1" +#define MOUNT_CIFS_VERSION_MINOR "12" + +#ifndef MOUNT_CIFS_VENDOR_SUFFIX + #ifdef _SAMBA_BUILD_ + #include "version.h" + #ifdef SAMBA_VERSION_VENDOR_SUFFIX + #define MOUNT_CIFS_VENDOR_SUFFIX "-"SAMBA_VERSION_OFFICIAL_STRING"-"SAMBA_VERSION_VENDOR_SUFFIX + #else + #define MOUNT_CIFS_VENDOR_SUFFIX "-"SAMBA_VERSION_OFFICIAL_STRING + #endif /* SAMBA_VERSION_OFFICIAL_STRING and SAMBA_VERSION_VENDOR_SUFFIX */ + #else + #define MOUNT_CIFS_VENDOR_SUFFIX "" + #endif /* _SAMBA_BUILD_ */ +#endif /* MOUNT_CIFS_VENDOR_SUFFIX */ + +#ifdef _SAMBA_BUILD_ +#include "include/config.h" +#endif + +#ifndef MS_MOVE +#define MS_MOVE 8192 +#endif + +#ifndef MS_BIND +#define MS_BIND 4096 +#endif + +#define MAX_UNC_LEN 1024 + +#define CONST_DISCARD(type, ptr) ((type) ((void *) (ptr))) + +#ifndef SAFE_FREE +#define SAFE_FREE(x) do { if ((x) != NULL) {free(x); x=NULL;} } while(0) +#endif + +#define MOUNT_PASSWD_SIZE 128 +#define DOMAIN_SIZE 64 + +/* currently maximum length of IPv6 address string */ +#define MAX_ADDRESS_LEN INET6_ADDRSTRLEN + +const char *thisprogram; +int verboseflag = 0; +int fakemnt = 0; +static int got_password = 0; +static int got_user = 0; +static int got_domain = 0; +static int got_ip = 0; +static int got_unc = 0; +static int got_uid = 0; +static int got_gid = 0; +static char * user_name = NULL; +static char * mountpassword = NULL; +char * domain_name = NULL; +char * prefixpath = NULL; + +/* glibc doesn't have strlcpy, strlcat. Ensure we do. JRA. We + * don't link to libreplace so need them here. */ + +/* like strncpy but does not 0 fill the buffer and always null + * terminates. bufsize is the size of the destination buffer */ + +#ifndef HAVE_STRLCPY +static size_t strlcpy(char *d, const char *s, size_t bufsize) +{ + size_t len = strlen(s); + size_t ret = len; + if (bufsize <= 0) return 0; + if (len >= bufsize) len = bufsize-1; + memcpy(d, s, len); + d[len] = 0; + return ret; +} +#endif + +/* like strncat but does not 0 fill the buffer and always null + * terminates. bufsize is the length of the buffer, which should + * be one more than the maximum resulting string length */ + +#ifndef HAVE_STRLCAT +static size_t strlcat(char *d, const char *s, size_t bufsize) +{ + size_t len1 = strlen(d); + size_t len2 = strlen(s); + size_t ret = len1 + len2; + + if (len1+len2 >= bufsize) { + if (bufsize < (len1+1)) { + return ret; + } + len2 = bufsize - (len1+1); + } + if (len2 > 0) { + memcpy(d+len1, s, len2); + d[len1+len2] = 0; + } + return ret; +} +#endif + +/* BB finish BB + + cifs_umount + open nofollow - avoid symlink exposure? + get owner of dir see if matches self or if root + call system(umount argv) etc. + +BB end finish BB */ + +static char * check_for_domain(char **); + + +static void mount_cifs_usage(void) +{ + printf("\nUsage: %s -o \n", thisprogram); + printf("\nMount the remote target, specified as a UNC name,"); + printf(" to a local directory.\n\nOptions:\n"); + printf("\tuser=\n\tpass=\n\tdom=\n"); + printf("\nLess commonly used options:"); + printf("\n\tcredentials=,guest,perm,noperm,setuids,nosetuids,rw,ro,"); + printf("\n\tsep=,iocharset=,suid,nosuid,exec,noexec,serverino,"); + printf("\n\tmapchars,nomapchars,nolock,servernetbiosname="); + printf("\n\tdirectio,nounix,cifsacl,sec=,sign"); + printf("\n\nOptions not needed for servers supporting CIFS Unix extensions"); + printf("\n\t(e.g. unneeded for mounts to most Samba versions):"); + printf("\n\tuid=,gid=,dir_mode=,file_mode=,sfu"); + printf("\n\nRarely used options:"); + printf("\n\tport=,rsize=,wsize=,unc=,ip=,"); + printf("\n\tdev,nodev,nouser_xattr,netbiosname=,hard,soft,intr,"); + printf("\n\tnointr,ignorecase,noposixpaths,noacl,prefixpath=,nobrl"); + printf("\n\tin6_addr"); + printf("\n\nOptions are described in more detail in the manual page"); + printf("\n\tman 8 mount.cifs\n"); + printf("\nTo display the version number of the mount helper:"); + printf("\n\t%s -V\n",thisprogram); + + SAFE_FREE(mountpassword); +} + +/* caller frees username if necessary */ +static char * getusername(void) { + char *username = NULL; + struct passwd *password = getpwuid(getuid()); + + if (password) { + username = password->pw_name; + } + return username; +} + +static int open_cred_file(char * file_name) +{ + char * line_buf; + char * temp_val; + FILE * fs; + int i, length; + fs = fopen(file_name,"r"); + if(fs == NULL) + return errno; + line_buf = (char *)malloc(4096); + if(line_buf == NULL) { + fclose(fs); + return ENOMEM; + } + + while(fgets(line_buf,4096,fs)) { + /* parse line from credential file */ + + /* eat leading white space */ + for(i=0;i<4086;i++) { + if((line_buf[i] != ' ') && (line_buf[i] != '\t')) + break; + /* if whitespace - skip past it */ + } + if (strncasecmp("username",line_buf+i,8) == 0) { + temp_val = strchr(line_buf + i,'='); + if(temp_val) { + /* go past equals sign */ + temp_val++; + for(length = 0;length<4087;length++) { + if ((temp_val[length] == '\n') + || (temp_val[length] == '\0')) { + temp_val[length] = '\0'; + break; + } + } + if(length > 4086) { + printf("mount.cifs failed due to malformed username in credentials file"); + memset(line_buf,0,4096); + exit(EX_USAGE); + } else { + got_user = 1; + user_name = (char *)calloc(1 + length,1); + /* BB adding free of user_name string before exit, + not really necessary but would be cleaner */ + strlcpy(user_name,temp_val, length+1); + } + } + } else if (strncasecmp("password",line_buf+i,8) == 0) { + temp_val = strchr(line_buf+i,'='); + if(temp_val) { + /* go past equals sign */ + temp_val++; + for(length = 0;length MOUNT_PASSWD_SIZE) { + printf("mount.cifs failed: password in credentials file too long\n"); + memset(line_buf,0, 4096); + exit(EX_USAGE); + } else { + if(mountpassword == NULL) { + mountpassword = (char *)calloc(MOUNT_PASSWD_SIZE+1,1); + } else + memset(mountpassword,0,MOUNT_PASSWD_SIZE); + if(mountpassword) { + strlcpy(mountpassword,temp_val,MOUNT_PASSWD_SIZE+1); + got_password = 1; + } + } + } + } else if (strncasecmp("domain",line_buf+i,6) == 0) { + temp_val = strchr(line_buf+i,'='); + if(temp_val) { + /* go past equals sign */ + temp_val++; + if(verboseflag) + printf("\nDomain %s\n",temp_val); + for(length = 0;length DOMAIN_SIZE) { + printf("mount.cifs failed: domain in credentials file too long\n"); + exit(EX_USAGE); + } else { + if(domain_name == NULL) { + domain_name = (char *)calloc(DOMAIN_SIZE+1,1); + } else + memset(domain_name,0,DOMAIN_SIZE); + if(domain_name) { + strlcpy(domain_name,temp_val,DOMAIN_SIZE+1); + got_domain = 1; + } + } + } + } + + } + fclose(fs); + SAFE_FREE(line_buf); + return 0; +} + +static int get_password_from_file(int file_descript, char * filename) +{ + int rc = 0; + int i; + char c; + + if(mountpassword == NULL) + mountpassword = (char *)calloc(MOUNT_PASSWD_SIZE+1,1); + else + memset(mountpassword, 0, MOUNT_PASSWD_SIZE); + + if (mountpassword == NULL) { + printf("malloc failed\n"); + exit(EX_SYSERR); + } + + if(filename != NULL) { + file_descript = open(filename, O_RDONLY); + if(file_descript < 0) { + printf("mount.cifs failed. %s attempting to open password file %s\n", + strerror(errno),filename); + exit(EX_SYSERR); + } + } + /* else file already open and fd provided */ + + for(i=0;ipw_uid); + } else { + strlcpy(user,value,sizeof(user)); + } + } + goto nocopy; + } else if (strncmp(data, "gid", 3) == 0) { + if (value && *value) { + got_gid = 1; + if (!isdigit(*value)) { + struct group *gr; + + if (!(gr = getgrnam(value))) { + printf("bad group name \"%s\"\n", value); + exit(EX_USAGE); + } + snprintf(group, sizeof(group), "%u", gr->gr_gid); + } else { + strlcpy(group,value,sizeof(group)); + } + } + goto nocopy; + /* fmask and dmask synonyms for people used to smbfs syntax */ + } else if (strcmp(data, "file_mode") == 0 || strcmp(data, "fmask")==0) { + if (!value || !*value) { + printf ("Option '%s' requires a numerical argument\n", data); + SAFE_FREE(out); + return 1; + } + + if (value[0] != '0') { + printf ("WARNING: '%s' not expressed in octal.\n", data); + } + + if (strcmp (data, "fmask") == 0) { + printf ("WARNING: CIFS mount option 'fmask' is deprecated. Use 'file_mode' instead.\n"); + data = "file_mode"; /* BB fix this */ + } + } else if (strcmp(data, "dir_mode") == 0 || strcmp(data, "dmask")==0) { + if (!value || !*value) { + printf ("Option '%s' requires a numerical argument\n", data); + SAFE_FREE(out); + return 1; + } + + if (value[0] != '0') { + printf ("WARNING: '%s' not expressed in octal.\n", data); + } + + if (strcmp (data, "dmask") == 0) { + printf ("WARNING: CIFS mount option 'dmask' is deprecated. Use 'dir_mode' instead.\n"); + data = "dir_mode"; + } + /* the following eight mount options should be + stripped out from what is passed into the kernel + since these eight options are best passed as the + mount flags rather than redundantly to the kernel + and could generate spurious warnings depending on the + level of the corresponding cifs vfs kernel code */ + } else if (strncmp(data, "nosuid", 6) == 0) { + *filesys_flags |= MS_NOSUID; + } else if (strncmp(data, "suid", 4) == 0) { + *filesys_flags &= ~MS_NOSUID; + } else if (strncmp(data, "nodev", 5) == 0) { + *filesys_flags |= MS_NODEV; + } else if ((strncmp(data, "nobrl", 5) == 0) || + (strncmp(data, "nolock", 6) == 0)) { + *filesys_flags &= ~MS_MANDLOCK; + } else if (strncmp(data, "dev", 3) == 0) { + *filesys_flags &= ~MS_NODEV; + } else if (strncmp(data, "noexec", 6) == 0) { + *filesys_flags |= MS_NOEXEC; + } else if (strncmp(data, "exec", 4) == 0) { + *filesys_flags &= ~MS_NOEXEC; + } else if (strncmp(data, "guest", 5) == 0) { + user_name = (char *)calloc(1, 1); + got_user = 1; + got_password = 1; + } else if (strncmp(data, "ro", 2) == 0) { + *filesys_flags |= MS_RDONLY; + } else if (strncmp(data, "rw", 2) == 0) { + *filesys_flags &= ~MS_RDONLY; + } else if (strncmp(data, "remount", 7) == 0) { + *filesys_flags |= MS_REMOUNT; + } /* else if (strnicmp(data, "port", 4) == 0) { + if (value && *value) { + vol->port = + simple_strtoul(value, &value, 0); + } + } else if (strnicmp(data, "rsize", 5) == 0) { + if (value && *value) { + vol->rsize = + simple_strtoul(value, &value, 0); + } + } else if (strnicmp(data, "wsize", 5) == 0) { + if (value && *value) { + vol->wsize = + simple_strtoul(value, &value, 0); + } + } else if (strnicmp(data, "version", 3) == 0) { + } else { + printf("CIFS: Unknown mount option %s\n",data); + } */ /* nothing to do on those four mount options above. + Just pass to kernel and ignore them here */ + + /* Copy (possibly modified) option to out */ + word_len = strlen(data); + if (value) + word_len += 1 + strlen(value); + + out = (char *)realloc(out, out_len + word_len + 2); + if (out == NULL) { + perror("malloc"); + exit(EX_SYSERR); + } + + if (out_len) { + strlcat(out, ",", out_len + word_len + 2); + out_len++; + } + + if (value) + snprintf(out + out_len, word_len + 1, "%s=%s", data, value); + else + snprintf(out + out_len, word_len + 1, "%s", data); + out_len = strlen(out); + +nocopy: + data = next_keyword; + } + + /* special-case the uid and gid */ + if (got_uid) { + word_len = strlen(user); + + out = (char *)realloc(out, out_len + word_len + 6); + if (out == NULL) { + perror("malloc"); + exit(EX_SYSERR); + } + + if (out_len) { + strlcat(out, ",", out_len + word_len + 6); + out_len++; + } + snprintf(out + out_len, word_len + 5, "uid=%s", user); + out_len = strlen(out); + } + if (got_gid) { + word_len = strlen(group); + + out = (char *)realloc(out, out_len + 1 + word_len + 6); + if (out == NULL) { + perror("malloc"); + exit(EX_SYSERR); + } + + if (out_len) { + strlcat(out, ",", out_len + word_len + 6); + out_len++; + } + snprintf(out + out_len, word_len + 5, "gid=%s", group); + out_len = strlen(out); + } + + SAFE_FREE(*optionsp); + *optionsp = out; + return 0; +} + +/* replace all (one or more) commas with double commas */ +static void check_for_comma(char ** ppasswrd) +{ + char *new_pass_buf; + char *pass; + int i,j; + int number_of_commas = 0; + int len; + + if(ppasswrd == NULL) + return; + else + (pass = *ppasswrd); + + len = strlen(pass); + + for(i=0;i MOUNT_PASSWD_SIZE) { + /* would otherwise overflow the mount options buffer */ + printf("\nInvalid password. Password contains too many commas.\n"); + return; + } + + new_pass_buf = (char *)malloc(len+number_of_commas+1); + if(new_pass_buf == NULL) + return; + + for(i=0,j=0;i= original_len) { + /* should not happen */ + return domainnm; + } + + for(i=0;i= lastchar) + return; + } + } +} + +/* Note that caller frees the returned buffer if necessary */ +static struct addrinfo * +parse_server(char ** punc_name) +{ + char * unc_name = *punc_name; + int length = strnlen(unc_name, MAX_UNC_LEN); + char * share; + struct addrinfo *addrlist; + int rc; + + if(length > (MAX_UNC_LEN - 1)) { + printf("mount error: UNC name too long"); + return NULL; + } + if ((strncasecmp("cifs://", unc_name, 7) == 0) || + (strncasecmp("smb://", unc_name, 6) == 0)) { + printf("\nMounting cifs URL not implemented yet. Attempt to mount %s\n", unc_name); + return NULL; + } + + if(length < 3) { + /* BB add code to find DFS root here */ + printf("\nMounting the DFS root for domain not implemented yet\n"); + return NULL; + } else { + if(strncmp(unc_name,"//",2) && strncmp(unc_name,"\\\\",2)) { + /* check for nfs syntax ie server:share */ + share = strchr(unc_name,':'); + if(share) { + *punc_name = (char *)malloc(length+3); + if(*punc_name == NULL) { + /* put the original string back if + no memory left */ + *punc_name = unc_name; + return NULL; + } + *share = '/'; + strlcpy((*punc_name)+2,unc_name,length+1); + SAFE_FREE(unc_name); + unc_name = *punc_name; + unc_name[length+2] = 0; + goto continue_unc_parsing; + } else { + printf("mount error: improperly formatted UNC name."); + printf(" %s does not begin with \\\\ or //\n",unc_name); + return NULL; + } + } else { +continue_unc_parsing: + unc_name[0] = '/'; + unc_name[1] = '/'; + unc_name += 2; + + /* allow for either delimiter between host and sharename */ + if ((share = strpbrk(unc_name, "/\\"))) { + *share = 0; /* temporarily terminate the string */ + share += 1; + if(got_ip == 0) { + rc = getaddrinfo(unc_name, NULL, NULL, &addrlist); + if (rc != 0) { + printf("mount error: could not resolve address for %s: %s\n", + unc_name, gai_strerror(rc)); + addrlist = NULL; + } + } + *(share - 1) = '/'; /* put delimiter back */ + + /* we don't convert the prefixpath delimiters since '\\' is a valid char in posix paths */ + if ((prefixpath = strpbrk(share, "/\\"))) { + *prefixpath = 0; /* permanently terminate the string */ + if (!strlen(++prefixpath)) + prefixpath = NULL; /* this needs to be done explicitly */ + } + if(got_ip) { + if(verboseflag) + printf("ip address specified explicitly\n"); + return NULL; + } + /* BB should we pass an alternate version of the share name as Unicode */ + + return addrlist; + } else { + /* BB add code to find DFS root (send null path on get DFS Referral to specified server here */ + printf("Mounting the DFS root for a particular server not implemented yet\n"); + return NULL; + } + } + } +} + +static struct option longopts[] = { + { "all", 0, NULL, 'a' }, + { "help",0, NULL, 'h' }, + { "move",0, NULL, 'm' }, + { "bind",0, NULL, 'b' }, + { "read-only", 0, NULL, 'r' }, + { "ro", 0, NULL, 'r' }, + { "verbose", 0, NULL, 'v' }, + { "version", 0, NULL, 'V' }, + { "read-write", 0, NULL, 'w' }, + { "rw", 0, NULL, 'w' }, + { "options", 1, NULL, 'o' }, + { "type", 1, NULL, 't' }, + { "rsize",1, NULL, 'R' }, + { "wsize",1, NULL, 'W' }, + { "uid", 1, NULL, '1'}, + { "gid", 1, NULL, '2'}, + { "user",1,NULL,'u'}, + { "username",1,NULL,'u'}, + { "dom",1,NULL,'d'}, + { "domain",1,NULL,'d'}, + { "password",1,NULL,'p'}, + { "pass",1,NULL,'p'}, + { "credentials",1,NULL,'c'}, + { "port",1,NULL,'P'}, + /* { "uuid",1,NULL,'U'}, */ /* BB unimplemented */ + { NULL, 0, NULL, 0 } +}; + +/* convert a string to uppercase. return false if the string + * wasn't ASCII. Return success on a NULL ptr */ +static int +uppercase_string(char *string) +{ + if (!string) + return 1; + + while (*string) { + /* check for unicode */ + if ((unsigned char) string[0] & 0x80) + return 0; + *string = toupper((unsigned char) *string); + string++; + } + + return 1; +} + +static void print_cifs_mount_version(void) +{ + printf("mount.cifs version: %s.%s%s\n", + MOUNT_CIFS_VERSION_MAJOR, + MOUNT_CIFS_VERSION_MINOR, + MOUNT_CIFS_VENDOR_SUFFIX); +} + +int main(int argc, char ** argv) +{ + int c; + int flags = MS_MANDLOCK; /* no need to set legacy MS_MGC_VAL */ + char * orgoptions = NULL; + char * share_name = NULL; + const char * ipaddr = NULL; + char * uuid = NULL; + char * mountpoint = NULL; + char * options = NULL; + char * optionstail; + char * resolved_path = NULL; + char * temp; + char * dev_name; + int rc = 0; + int rsize = 0; + int wsize = 0; + int nomtab = 0; + int uid = 0; + int gid = 0; + int optlen = 0; + int orgoptlen = 0; + size_t options_size = 0; + size_t current_len; + int retry = 0; /* set when we have to retry mount with uppercase */ + struct addrinfo *addrhead = NULL, *addr; + struct stat statbuf; + struct utsname sysinfo; + struct mntent mountent; + struct sockaddr_in *addr4; + struct sockaddr_in6 *addr6; + FILE * pmntfile; + + /* setlocale(LC_ALL, ""); + bindtextdomain(PACKAGE, LOCALEDIR); + textdomain(PACKAGE); */ + + if(argc && argv) { + thisprogram = argv[0]; + } else { + mount_cifs_usage(); + exit(EX_USAGE); + } + + if(thisprogram == NULL) + thisprogram = "mount.cifs"; + + uname(&sysinfo); + /* BB add workstation name and domain and pass down */ + +/* #ifdef _GNU_SOURCE + printf(" node: %s machine: %s sysname %s domain %s\n", sysinfo.nodename,sysinfo.machine,sysinfo.sysname,sysinfo.domainname); +#endif */ + if(argc > 2) { + dev_name = argv[1]; + share_name = strndup(argv[1], MAX_UNC_LEN); + if (share_name == NULL) { + fprintf(stderr, "%s: %s", argv[0], strerror(ENOMEM)); + exit(EX_SYSERR); + } + mountpoint = argv[2]; + } else if (argc == 2) { + if ((strcmp(argv[1], "-V") == 0) || + (strcmp(argv[1], "--version") == 0)) + { + print_cifs_mount_version(); + exit(0); + } + + if ((strcmp(argv[1], "-h") == 0) || + (strcmp(argv[1], "-?") == 0) || + (strcmp(argv[1], "--help") == 0)) + { + mount_cifs_usage(); + exit(0); + } + + mount_cifs_usage(); + exit(EX_USAGE); + } else { + mount_cifs_usage(); + exit(EX_USAGE); + } + + /* add sharename in opts string as unc= parm */ + + while ((c = getopt_long (argc, argv, "afFhilL:no:O:rsSU:vVwt:", + longopts, NULL)) != -1) { + switch (c) { +/* No code to do the following options yet */ +/* case 'l': + list_with_volumelabel = 1; + break; + case 'L': + volumelabel = optarg; + break; */ +/* case 'a': + ++mount_all; + break; */ + + case '?': + case 'h': /* help */ + mount_cifs_usage (); + exit(0); + case 'n': + ++nomtab; + break; + case 'b': +#ifdef MS_BIND + flags |= MS_BIND; +#else + fprintf(stderr, + "option 'b' (MS_BIND) not supported\n"); +#endif + break; + case 'm': +#ifdef MS_MOVE + flags |= MS_MOVE; +#else + fprintf(stderr, + "option 'm' (MS_MOVE) not supported\n"); +#endif + break; + case 'o': + orgoptions = strdup(optarg); + break; + case 'r': /* mount readonly */ + flags |= MS_RDONLY; + break; + case 'U': + uuid = optarg; + break; + case 'v': + ++verboseflag; + break; + case 'V': + print_cifs_mount_version(); + exit (0); + case 'w': + flags &= ~MS_RDONLY; + break; + case 'R': + rsize = atoi(optarg) ; + break; + case 'W': + wsize = atoi(optarg); + break; + case '1': + if (isdigit(*optarg)) { + char *ep; + + uid = strtoul(optarg, &ep, 10); + if (*ep) { + printf("bad uid value \"%s\"\n", optarg); + exit(EX_USAGE); + } + } else { + struct passwd *pw; + + if (!(pw = getpwnam(optarg))) { + printf("bad user name \"%s\"\n", optarg); + exit(EX_USAGE); + } + uid = pw->pw_uid; + endpwent(); + } + break; + case '2': + if (isdigit(*optarg)) { + char *ep; + + gid = strtoul(optarg, &ep, 10); + if (*ep) { + printf("bad gid value \"%s\"\n", optarg); + exit(EX_USAGE); + } + } else { + struct group *gr; + + if (!(gr = getgrnam(optarg))) { + printf("bad user name \"%s\"\n", optarg); + exit(EX_USAGE); + } + gid = gr->gr_gid; + endpwent(); + } + break; + case 'u': + got_user = 1; + user_name = optarg; + break; + case 'd': + domain_name = optarg; /* BB fix this - currently ignored */ + got_domain = 1; + break; + case 'p': + if(mountpassword == NULL) + mountpassword = (char *)calloc(MOUNT_PASSWD_SIZE+1,1); + if(mountpassword) { + got_password = 1; + strlcpy(mountpassword,optarg,MOUNT_PASSWD_SIZE+1); + } + break; + case 'S': + get_password_from_file(0 /* stdin */,NULL); + break; + case 't': + break; + case 'f': + ++fakemnt; + break; + default: + printf("unknown mount option %c\n",c); + mount_cifs_usage(); + exit(EX_USAGE); + } + } + + if((argc < 3) || (dev_name == NULL) || (mountpoint == NULL)) { + mount_cifs_usage(); + exit(EX_USAGE); + } + + if (getenv("PASSWD")) { + if(mountpassword == NULL) + mountpassword = (char *)calloc(MOUNT_PASSWD_SIZE+1,1); + if(mountpassword) { + strlcpy(mountpassword,getenv("PASSWD"),MOUNT_PASSWD_SIZE+1); + got_password = 1; + } + } else if (getenv("PASSWD_FD")) { + get_password_from_file(atoi(getenv("PASSWD_FD")),NULL); + } else if (getenv("PASSWD_FILE")) { + get_password_from_file(0, getenv("PASSWD_FILE")); + } + + if (orgoptions && parse_options(&orgoptions, &flags)) { + rc = EX_USAGE; + goto mount_exit; + } + addrhead = addr = parse_server(&share_name); + if((addrhead == NULL) && (got_ip == 0)) { + printf("No ip address specified and hostname not found\n"); + rc = EX_USAGE; + goto mount_exit; + } + + /* BB save off path and pop after mount returns? */ + resolved_path = (char *)malloc(PATH_MAX+1); + if(resolved_path) { + /* Note that if we can not canonicalize the name, we get + another chance to see if it is valid when we chdir to it */ + if (realpath(mountpoint, resolved_path)) { + mountpoint = resolved_path; + } + } + if(chdir(mountpoint)) { + printf("mount error: can not change directory into mount target %s\n",mountpoint); + rc = EX_USAGE; + goto mount_exit; + } + + if(stat (".", &statbuf)) { + printf("mount error: mount point %s does not exist\n",mountpoint); + rc = EX_USAGE; + goto mount_exit; + } + + if (S_ISDIR(statbuf.st_mode) == 0) { + printf("mount error: mount point %s is not a directory\n",mountpoint); + rc = EX_USAGE; + goto mount_exit; + } + + if((getuid() != 0) && (geteuid() == 0)) { + if((statbuf.st_uid == getuid()) && (S_IRWXU == (statbuf.st_mode & S_IRWXU))) { +#ifndef CIFS_ALLOW_USR_SUID + /* Do not allow user mounts to control suid flag + for mount unless explicitly built that way */ + flags |= MS_NOSUID | MS_NODEV; +#endif + } else { + printf("mount error: permission denied or not superuser and mount.cifs not installed SUID\n"); + exit(EX_USAGE); + } + } + + if(got_user == 0) { + /* Note that the password will not be retrieved from the + USER env variable (ie user%password form) as there is + already a PASSWD environment varaible */ + if (getenv("USER")) + user_name = strdup(getenv("USER")); + if (user_name == NULL) + user_name = getusername(); + got_user = 1; + } + + if(got_password == 0) { + char *tmp_pass = getpass("Password: "); /* BB obsolete sys call but + no good replacement yet. */ + mountpassword = (char *)calloc(MOUNT_PASSWD_SIZE+1,1); + if (!tmp_pass || !mountpassword) { + printf("Password not entered, exiting\n"); + exit(EX_USAGE); + } + strlcpy(mountpassword, tmp_pass, MOUNT_PASSWD_SIZE+1); + got_password = 1; + } + /* FIXME launch daemon (handles dfs name resolution and credential change) + remember to clear parms and overwrite password field before launching */ + if(orgoptions) { + optlen = strlen(orgoptions); + orgoptlen = optlen; + } else + optlen = 0; + if(share_name) + optlen += strlen(share_name) + 4; + else { + printf("No server share name specified\n"); + printf("\nMounting the DFS root for server not implemented yet\n"); + exit(EX_USAGE); + } + if(user_name) + optlen += strlen(user_name) + 6; + optlen += MAX_ADDRESS_LEN + 4; + if(mountpassword) + optlen += strlen(mountpassword) + 6; +mount_retry: + SAFE_FREE(options); + options_size = optlen + 10 + DOMAIN_SIZE; + options = (char *)malloc(options_size /* space for commas in password */ + 8 /* space for domain= , domain name itself was counted as part of the length username string above */); + + if(options == NULL) { + printf("Could not allocate memory for mount options\n"); + exit(EX_SYSERR); + } + + strlcpy(options, "unc=", options_size); + strlcat(options,share_name,options_size); + /* scan backwards and reverse direction of slash */ + temp = strrchr(options, '/'); + if(temp > options + 6) + *temp = '\\'; + if(user_name) { + /* check for syntax like user=domain\user */ + if(got_domain == 0) + domain_name = check_for_domain(&user_name); + strlcat(options,",user=",options_size); + strlcat(options,user_name,options_size); + } + if(retry == 0) { + if(domain_name) { + /* extra length accounted for in option string above */ + strlcat(options,",domain=",options_size); + strlcat(options,domain_name,options_size); + } + } + if(mountpassword) { + /* Commas have to be doubled, or else they will + look like the parameter separator */ +/* if(sep is not set)*/ + if(retry == 0) + check_for_comma(&mountpassword); + strlcat(options,",pass=",options_size); + strlcat(options,mountpassword,options_size); + } + + strlcat(options,",ver=",options_size); + strlcat(options,MOUNT_CIFS_VERSION_MAJOR,options_size); + + if(orgoptions) { + strlcat(options,",",options_size); + strlcat(options,orgoptions,options_size); + } + if(prefixpath) { + strlcat(options,",prefixpath=",options_size); + strlcat(options,prefixpath,options_size); /* no need to cat the / */ + } + if(verboseflag) + printf("\nmount.cifs kernel mount options %s \n",options); + + /* convert all '\\' to '/' in share portion so that /proc/mounts looks pretty */ + replace_char(dev_name, '\\', '/', strlen(share_name)); + + if (!got_ip && addr) { + strlcat(options, ",ip=", options_size); + current_len = strnlen(options, options_size); + optionstail = options + current_len; + switch (addr->ai_addr->sa_family) { + case AF_INET6: + addr6 = (struct sockaddr_in6 *) addr->ai_addr; + ipaddr = inet_ntop(AF_INET6, &addr6->sin6_addr, optionstail, + options_size - current_len); + break; + case AF_INET: + addr4 = (struct sockaddr_in *) addr->ai_addr; + ipaddr = inet_ntop(AF_INET, &addr4->sin_addr, optionstail, + options_size - current_len); + break; + } + + /* if the address looks bogus, try the next one */ + if (!ipaddr) { + addr = addr->ai_next; + if (addr) + goto mount_retry; + rc = EX_SYSERR; + goto mount_exit; + } + } + + if (!fakemnt && mount(dev_name, mountpoint, "cifs", flags, options)) { + switch (errno) { + case ECONNREFUSED: + case EHOSTUNREACH: + if (addr) { + addr = addr->ai_next; + if (addr) + goto mount_retry; + } + break; + case ENODEV: + printf("mount error: cifs filesystem not supported by the system\n"); + break; + case ENXIO: + if(retry == 0) { + retry = 1; + if (uppercase_string(dev_name) && + uppercase_string(share_name) && + uppercase_string(prefixpath)) { + printf("retrying with upper case share name\n"); + goto mount_retry; + } + } + } + printf("mount error(%d): %s\n", errno, strerror(errno)); + printf("Refer to the mount.cifs(8) manual page (e.g. man " + "mount.cifs)\n"); + rc = EX_FAIL; + goto mount_exit; + } + + if (nomtab) + goto mount_exit; + atexit(unlock_mtab); + rc = lock_mtab(); + if (rc) { + printf("cannot lock mtab"); + goto mount_exit; + } + pmntfile = setmntent(MOUNTED, "a+"); + if (!pmntfile) { + printf("could not update mount table\n"); + unlock_mtab(); + rc = EX_FILEIO; + goto mount_exit; + } + mountent.mnt_fsname = dev_name; + mountent.mnt_dir = mountpoint; + mountent.mnt_type = CONST_DISCARD(char *,"cifs"); + mountent.mnt_opts = (char *)malloc(220); + if(mountent.mnt_opts) { + char * mount_user = getusername(); + memset(mountent.mnt_opts,0,200); + if(flags & MS_RDONLY) + strlcat(mountent.mnt_opts,"ro",220); + else + strlcat(mountent.mnt_opts,"rw",220); + if(flags & MS_MANDLOCK) + strlcat(mountent.mnt_opts,",mand",220); + if(flags & MS_NOEXEC) + strlcat(mountent.mnt_opts,",noexec",220); + if(flags & MS_NOSUID) + strlcat(mountent.mnt_opts,",nosuid",220); + if(flags & MS_NODEV) + strlcat(mountent.mnt_opts,",nodev",220); + if(flags & MS_SYNCHRONOUS) + strlcat(mountent.mnt_opts,",sync",220); + if(mount_user) { + if(getuid() != 0) { + strlcat(mountent.mnt_opts, + ",user=", 220); + strlcat(mountent.mnt_opts, + mount_user, 220); + } + } + } + mountent.mnt_freq = 0; + mountent.mnt_passno = 0; + rc = addmntent(pmntfile,&mountent); + endmntent(pmntfile); + unlock_mtab(); + SAFE_FREE(mountent.mnt_opts); + if (rc) + rc = EX_FILEIO; +mount_exit: + if(mountpassword) { + int len = strlen(mountpassword); + memset(mountpassword,0,len); + SAFE_FREE(mountpassword); + } + + if (addrhead) + freeaddrinfo(addrhead); + SAFE_FREE(options); + SAFE_FREE(orgoptions); + SAFE_FREE(resolved_path); + SAFE_FREE(share_name); + exit(rc); +} diff --git a/client/mount.h b/client/mount.h new file mode 100644 index 0000000000..23ea4f0cbd --- /dev/null +++ b/client/mount.h @@ -0,0 +1,38 @@ +/* + * Copyright (C) 2008 Jeff Layton (jlayton@samba.org) + * + * This program is free software; you can redistribute it and/or modify + * 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 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see . + */ + +/* most of this info was taken from the util-linux-ng sources */ + +#ifndef _MOUNT_H_ +#define _MOUNT_H_ + +/* exit status - bits below are ORed */ +#define EX_USAGE 1 /* incorrect invocation or permission */ +#define EX_SYSERR 2 /* out of memory, cannot fork, ... */ +#define EX_SOFTWARE 4 /* internal mount bug or wrong version */ +#define EX_USER 8 /* user interrupt */ +#define EX_FILEIO 16 /* problems writing, locking, ... mtab/fstab */ +#define EX_FAIL 32 /* mount failure */ +#define EX_SOMEOK 64 /* some mount succeeded */ + +#define _PATH_MOUNTED_LOCK _PATH_MOUNTED "~" +#define _PATH_MOUNTED_TMP _PATH_MOUNTED ".tmp" + +extern int lock_mtab(void); +extern void unlock_mtab(void); + +#endif /* ! _MOUNT_H_ */ diff --git a/client/mtab.c b/client/mtab.c new file mode 100644 index 0000000000..70789bcb9d --- /dev/null +++ b/client/mtab.c @@ -0,0 +1,220 @@ +/* + * mtab locking routines for use with mount.cifs and umount.cifs + * Copyright (C) 2008 Jeff Layton (jlayton@samba.org) + * + * This program is free software; you can redistribute it and/or modify + * 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 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see . +*/ + +/* + * This code was copied from the util-linux-ng sources and modified: + * + * git://git.kernel.org/pub/scm/utils/util-linux-ng/util-linux-ng.git + * + * ...specifically from mount/fstab.c. That file has no explicit license. The + * "default" license for anything in that tree is apparently GPLv2+, so I + * believe we're OK to copy it here. + * + * Jeff Layton + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include "mount.h" + + +/* Updating mtab ----------------------------------------------*/ + +/* Flag for already existing lock file. */ +static int we_created_lockfile = 0; +static int lockfile_fd = -1; + +/* Flag to indicate that signals have been set up. */ +static int signals_have_been_setup = 0; + +static void +handler (int sig) { + exit(EX_USER); +} + +static void +setlkw_timeout (int sig) { + /* nothing, fcntl will fail anyway */ +} + +/* Remove lock file. */ +void +unlock_mtab (void) { + if (we_created_lockfile) { + close(lockfile_fd); + lockfile_fd = -1; + unlink (_PATH_MOUNTED_LOCK); + we_created_lockfile = 0; + } +} + +/* Create the lock file. + The lock file will be removed if we catch a signal or when we exit. */ +/* The old code here used flock on a lock file /etc/mtab~ and deleted + this lock file afterwards. However, as rgooch remarks, that has a + race: a second mount may be waiting on the lock and proceed as + soon as the lock file is deleted by the first mount, and immediately + afterwards a third mount comes, creates a new /etc/mtab~, applies + flock to that, and also proceeds, so that the second and third mount + now both are scribbling in /etc/mtab. + The new code uses a link() instead of a creat(), where we proceed + only if it was us that created the lock, and hence we always have + to delete the lock afterwards. Now the use of flock() is in principle + superfluous, but avoids an arbitrary sleep(). */ + +/* Where does the link point to? Obvious choices are mtab and mtab~~. + HJLu points out that the latter leads to races. Right now we use + mtab~. instead. Use 20 as upper bound for the length of %d. */ +#define MOUNTLOCK_LINKTARGET _PATH_MOUNTED_LOCK "%d" +#define MOUNTLOCK_LINKTARGET_LTH (sizeof(_PATH_MOUNTED_LOCK)+20) + +/* + * The original mount locking code has used sleep(1) between attempts and + * maximal number of attemps has been 5. + * + * There was very small number of attempts and extremely long waiting (1s) + * that is useless on machines with large number of concurret mount processes. + * + * Now we wait few thousand microseconds between attempts and we have global + * time limit (30s) rather than limit for number of attempts. The advantage + * is that this method also counts time which we spend in fcntl(F_SETLKW) and + * number of attempts is not so much restricted. + * + * -- kzak@redhat.com [2007-Mar-2007] + */ + +/* maximum seconds between first and last attempt */ +#define MOUNTLOCK_MAXTIME 30 + +/* sleep time (in microseconds, max=999999) between attempts */ +#define MOUNTLOCK_WAITTIME 5000 + +int +lock_mtab (void) { + int i; + struct timespec waittime; + struct timeval maxtime; + char linktargetfile[MOUNTLOCK_LINKTARGET_LTH]; + + if (!signals_have_been_setup) { + int sig = 0; + struct sigaction sa; + + sa.sa_handler = handler; + sa.sa_flags = 0; + sigfillset (&sa.sa_mask); + + while (sigismember (&sa.sa_mask, ++sig) != -1 + && sig != SIGCHLD) { + if (sig == SIGALRM) + sa.sa_handler = setlkw_timeout; + else + sa.sa_handler = handler; + sigaction (sig, &sa, (struct sigaction *) 0); + } + signals_have_been_setup = 1; + } + + sprintf(linktargetfile, MOUNTLOCK_LINKTARGET, getpid ()); + + i = open (linktargetfile, O_WRONLY|O_CREAT, S_IRUSR|S_IWUSR); + if (i < 0) { + /* linktargetfile does not exist (as a file) + and we cannot create it. Read-only filesystem? + Too many files open in the system? + Filesystem full? */ + return EX_FILEIO; + } + close(i); + + gettimeofday(&maxtime, NULL); + maxtime.tv_sec += MOUNTLOCK_MAXTIME; + + waittime.tv_sec = 0; + waittime.tv_nsec = (1000 * MOUNTLOCK_WAITTIME); + + /* Repeat until it was us who made the link */ + while (!we_created_lockfile) { + struct timeval now; + struct flock flock; + int errsv, j; + + j = link(linktargetfile, _PATH_MOUNTED_LOCK); + errsv = errno; + + if (j == 0) + we_created_lockfile = 1; + + if (j < 0 && errsv != EEXIST) { + (void) unlink(linktargetfile); + return EX_FILEIO; + } + + lockfile_fd = open (_PATH_MOUNTED_LOCK, O_WRONLY); + + if (lockfile_fd < 0) { + /* Strange... Maybe the file was just deleted? */ + gettimeofday(&now, NULL); + if (errno == ENOENT && now.tv_sec < maxtime.tv_sec) { + we_created_lockfile = 0; + continue; + } + (void) unlink(linktargetfile); + return EX_FILEIO; + } + + flock.l_type = F_WRLCK; + flock.l_whence = SEEK_SET; + flock.l_start = 0; + flock.l_len = 0; + + if (j == 0) { + /* We made the link. Now claim the lock. If we can't + * get it, continue anyway + */ + fcntl (lockfile_fd, F_SETLK, &flock); + (void) unlink(linktargetfile); + } else { + /* Someone else made the link. Wait. */ + gettimeofday(&now, NULL); + if (now.tv_sec < maxtime.tv_sec) { + alarm(maxtime.tv_sec - now.tv_sec); + if (fcntl (lockfile_fd, F_SETLKW, &flock) == -1) { + (void) unlink(linktargetfile); + return EX_FILEIO; + } + alarm(0); + nanosleep(&waittime, NULL); + } else { + (void) unlink(linktargetfile); + return EX_FILEIO; + } + close(lockfile_fd); + } + } + return 0; +} + diff --git a/client/umount.cifs.c b/client/umount.cifs.c new file mode 100644 index 0000000000..0005054467 --- /dev/null +++ b/client/umount.cifs.c @@ -0,0 +1,405 @@ +/* + Unmount utility program for Linux CIFS VFS (virtual filesystem) client + Copyright (C) 2005 Steve French (sfrench@us.ibm.com) + + This program is free software; you can redistribute it and/or modify + 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 + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see . */ + +#ifndef _GNU_SOURCE +#define _GNU_SOURCE +#endif + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include "mount.h" + +#define UNMOUNT_CIFS_VERSION_MAJOR "0" +#define UNMOUNT_CIFS_VERSION_MINOR "6" + +#ifndef UNMOUNT_CIFS_VENDOR_SUFFIX + #ifdef _SAMBA_BUILD_ + #include "version.h" + #ifdef SAMBA_VERSION_VENDOR_SUFFIX + #define UNMOUNT_CIFS_VENDOR_SUFFIX "-"SAMBA_VERSION_OFFICIAL_STRING"-"SAMBA_VERSION_VENDOR_SUFFIX + #else + #define UNMOUNT_CIFS_VENDOR_SUFFIX "-"SAMBA_VERSION_OFFICIAL_STRING + #endif /* SAMBA_VERSION_OFFICIAL_STRING and SAMBA_VERSION_VENDOR_SUFFIX */ + #else + #define UNMOUNT_CIFS_VENDOR_SUFFIX "" + #endif /* _SAMBA_BUILD_ */ +#endif /* UNMOUNT_CIFS_VENDOR_SUFFIX */ + +#ifndef MNT_DETACH +#define MNT_DETACH 0x02 +#endif + +#ifndef MNT_EXPIRE +#define MNT_EXPIRE 0x04 +#endif + +#ifndef MOUNTED_LOCK +#define MOUNTED_LOCK "/etc/mtab~" +#endif +#ifndef MOUNTED_TEMP +#define MOUNTED_TEMP "/etc/mtab.tmp" +#endif + +#define CIFS_IOC_CHECKUMOUNT _IO(0xCF, 2) +#define CIFS_MAGIC_NUMBER 0xFF534D42 /* the first four bytes of SMB PDU */ + +static struct option longopts[] = { + { "all", 0, NULL, 'a' }, + { "help",0, NULL, 'h' }, + { "read-only", 0, NULL, 'r' }, + { "ro", 0, NULL, 'r' }, + { "verbose", 0, NULL, 'v' }, + { "version", 0, NULL, 'V' }, + { "expire", 0, NULL, 'e' }, + { "force", 0, 0, 'f' }, + { "lazy", 0, 0, 'l' }, + { "no-mtab", 0, 0, 'n' }, + { NULL, 0, NULL, 0 } +}; + +const char * thisprogram; +int verboseflg = 0; + +static void umount_cifs_usage(void) +{ + printf("\nUsage: %s \n", thisprogram); + printf("\nUnmount the specified directory\n"); + printf("\nLess commonly used options:"); + printf("\n\t-r\tIf mount fails, retry with readonly remount."); + printf("\n\t-n\tDo not write to mtab."); + printf("\n\t-f\tAttempt a forced unmount, even if the fs is busy."); + printf("\n\t-l\tAttempt lazy unmount, Unmount now, cleanup later."); + printf("\n\t-v\tEnable verbose mode (may be useful for debugging)."); + printf("\n\t-h\tDisplay this help."); + printf("\n\nOptions are described in more detail in the manual page"); + printf("\n\tman 8 umount.cifs\n"); + printf("\nTo display the version number of the cifs umount utility:"); + printf("\n\t%s -V\n",thisprogram); + printf("\nInvoking the umount utility on cifs mounts, can execute"); + printf(" /sbin/umount.cifs (if present and umount -i is not specified.\n"); +} + +static int umount_check_perm(char * dir) +{ + int fileid; + int rc; + + /* allow root to unmount, no matter what */ + if(getuid() == 0) + return 0; + + /* presumably can not chdir into the target as we do on mount */ + fileid = open(dir, O_RDONLY | O_DIRECTORY | O_NOFOLLOW, 0); + if(fileid == -1) { + if(verboseflg) + printf("error opening mountpoint %d %s",errno,strerror(errno)); + return errno; + } + + rc = ioctl(fileid, CIFS_IOC_CHECKUMOUNT, NULL); + + if(verboseflg) + printf("ioctl returned %d with errno %d %s\n",rc,errno,strerror(errno)); + + if(rc == ENOTTY) { + printf("user unmounting via %s is an optional feature of",thisprogram); + printf(" the cifs filesystem driver (cifs.ko)"); + printf("\n\tand requires cifs.ko version 1.32 or later\n"); + } else if (rc != 0) + printf("user unmount of %s failed with %d %s\n",dir,errno,strerror(errno)); + close(fileid); + + return rc; +} + +static int remove_from_mtab(char * mountpoint) +{ + int rc; + int num_matches; + FILE * org_fd; + FILE * new_fd; + struct mntent * mount_entry; + + /* Do we need to check if it is a symlink to e.g. /proc/mounts + in which case we probably do not want to update it? */ + + /* Do we first need to check if it is writable? */ + + atexit(unlock_mtab); + if (lock_mtab()) { + printf("Mount table locked\n"); + return -EACCES; + } + + if(verboseflg) + printf("attempting to remove from mtab\n"); + + org_fd = setmntent(MOUNTED, "r"); + + if(org_fd == NULL) { + printf("Can not open %s\n",MOUNTED); + unlock_mtab(); + return -EIO; + } + + new_fd = setmntent(MOUNTED_TEMP,"w"); + if(new_fd == NULL) { + printf("Can not open temp file %s", MOUNTED_TEMP); + endmntent(org_fd); + unlock_mtab(); + return -EIO; + } + + /* BB fix so we only remove the last entry that matches BB */ + num_matches = 0; + while((mount_entry = getmntent(org_fd)) != NULL) { + if(strcmp(mount_entry->mnt_dir, mountpoint) == 0) { + num_matches++; + } + } + if(verboseflg) + printf("%d matching entries in mount table\n", num_matches); + + /* Is there a better way to seek back to the first entry in mtab? */ + endmntent(org_fd); + org_fd = setmntent(MOUNTED, "r"); + + if(org_fd == NULL) { + printf("Can not open %s\n",MOUNTED); + unlock_mtab(); + return -EIO; + } + + while((mount_entry = getmntent(org_fd)) != NULL) { + if(strcmp(mount_entry->mnt_dir, mountpoint) != 0) { + addmntent(new_fd, mount_entry); + } else { + if(num_matches != 1) { + addmntent(new_fd, mount_entry); + num_matches--; + } else if(verboseflg) + printf("entry not copied (ie entry is removed)\n"); + } + } + + if(verboseflg) + printf("done updating tmp file\n"); + rc = fchmod (fileno (new_fd), S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH); + if(rc < 0) { + printf("error %s changing mode of %s\n", strerror(errno), + MOUNTED_TEMP); + } + endmntent(new_fd); + + rc = rename(MOUNTED_TEMP, MOUNTED); + + if(rc < 0) { + printf("failure %s renaming %s to %s\n",strerror(errno), + MOUNTED_TEMP, MOUNTED); + unlock_mtab(); + return -EIO; + } + + unlock_mtab(); + + return rc; +} + +/* Make a canonical pathname from PATH. Returns a freshly malloced string. + It is up the *caller* to ensure that the PATH is sensible. i.e. + canonicalize ("/dev/fd0/.") returns "/dev/fd0" even though ``/dev/fd0/.'' + is not a legal pathname for ``/dev/fd0'' Anything we cannot parse + we return unmodified. */ +static char * +canonicalize(char *path) +{ + char *canonical; + + if (path == NULL) { + return NULL; + } + + if (strlen(path) > PATH_MAX) { + fprintf(stderr, "Mount point string too long\n"); + return NULL; + } + + canonical = (char *)malloc (PATH_MAX + 1); + + if (!canonical) { + fprintf(stderr, "Error! Not enough memory!\n"); + return NULL; + } + + if (realpath (path, canonical)) + return canonical; + + strncpy (canonical, path, PATH_MAX); + canonical[PATH_MAX] = '\0'; + return canonical; +} + +int main(int argc, char ** argv) +{ + int c; + int rc; + int flags = 0; + int nomtab = 0; + int retry_remount = 0; + struct statfs statbuf; + char * mountpoint; + + if(argc && argv) { + thisprogram = argv[0]; + } else { + umount_cifs_usage(); + return -EINVAL; + } + + if(argc < 2) { + umount_cifs_usage(); + return -EINVAL; + } + + if(thisprogram == NULL) + thisprogram = "umount.cifs"; + + /* add sharename in opts string as unc= parm */ + + while ((c = getopt_long (argc, argv, "afhilnrvV", + longopts, NULL)) != -1) { + switch (c) { +/* No code to do the following option yet */ +/* case 'a': + ++umount_all; + break; */ + case '?': + case 'h': /* help */ + umount_cifs_usage(); + exit(1); + case 'n': + ++nomtab; + break; + case 'f': + flags |= MNT_FORCE; + break; + case 'l': + flags |= MNT_DETACH; /* lazy unmount */ + break; + case 'e': + flags |= MNT_EXPIRE; /* gradually timeout */ + break; + case 'r': + ++retry_remount; + break; + case 'v': + ++verboseflg; + break; + case 'V': + printf ("umount.cifs version: %s.%s%s\n", + UNMOUNT_CIFS_VERSION_MAJOR, + UNMOUNT_CIFS_VERSION_MINOR, + UNMOUNT_CIFS_VENDOR_SUFFIX); + exit (0); + default: + printf("unknown unmount option %c\n",c); + umount_cifs_usage(); + exit(1); + } + } + + /* move past the umount options */ + argv += optind; + argc -= optind; + + mountpoint = canonicalize(argv[0]); + + if((argc < 1) || (argv[0] == NULL)) { + printf("\nMissing name of unmount directory\n"); + umount_cifs_usage(); + return -EINVAL; + } + + if(verboseflg) + printf("optind %d unmount dir %s\n",optind, mountpoint); + + /* check if running effectively root */ + if(geteuid() != 0) { + printf("Trying to unmount when %s not installed suid\n",thisprogram); + if(verboseflg) + printf("euid = %d\n",geteuid()); + return -EACCES; + } + + /* fixup path if needed */ + + /* Trim any trailing slashes */ + while ((strlen(mountpoint) > 1) && + (mountpoint[strlen(mountpoint)-1] == '/')) + { + mountpoint[strlen(mountpoint)-1] = '\0'; + } + + /* make sure that this is a cifs filesystem */ + rc = statfs(mountpoint, &statbuf); + + if(rc || (statbuf.f_type != CIFS_MAGIC_NUMBER)) { + printf("This utility only unmounts cifs filesystems.\n"); + return -EINVAL; + } + + /* check if our uid was the one who mounted */ + rc = umount_check_perm(mountpoint); + if (rc) { + printf("Not permitted to unmount\n"); + return rc; + } + + if(umount2(mountpoint, flags)) { + /* remember to kill daemon on error */ + switch (errno) { + case 0: + printf("unmount failed but no error number set\n"); + break; + default: + printf("unmount error %d = %s\n",errno,strerror(errno)); + } + printf("Refer to the umount.cifs(8) manual page (man 8 umount.cifs)\n"); + return -1; + } else { + if(verboseflg) + printf("umount2 succeeded\n"); + if(nomtab == 0) + remove_from_mtab(mountpoint); + } + + return 0; +} + -- cgit