diff options
Diffstat (limited to 'source3/smbd/trans2.c')
| -rw-r--r-- | source3/smbd/trans2.c | 331 |
1 files changed, 328 insertions, 3 deletions
diff --git a/source3/smbd/trans2.c b/source3/smbd/trans2.c index 2f164dafa2..b1807705a0 100644 --- a/source3/smbd/trans2.c +++ b/source3/smbd/trans2.c @@ -50,6 +50,324 @@ SMB_BIG_UINT get_allocation_size(files_struct *fsp, SMB_STRUCT_STAT *sbuf) } /**************************************************************************** + Utility functions for dealing with extended attributes. +****************************************************************************/ + +static const char *prohibited_ea_names[] = { + SAMBA_POSIX_INHERITANCE_EA_NAME, + NULL +}; + +/**************************************************************************** + Refuse to allow clients to overwrite our private xattrs. +****************************************************************************/ + +static BOOL samba_private_attr_name(const char *unix_ea_name) +{ + int i; + + for (i = 0; prohibited_ea_names[i]; i++) { + if (strequal( prohibited_ea_names[i], unix_ea_name)) + return True; + } + return False; +} + +struct ea_list { + struct ea_list *next, *prev; + struct ea_struct ea; +}; + +/**************************************************************************** + Get one EA value. Fill in a struct ea_struct. +****************************************************************************/ + +static BOOL get_ea_value(TALLOC_CTX *mem_ctx, connection_struct *conn, files_struct *fsp, + const char *fname, char *ea_name, struct ea_struct *pea) +{ + /* Get the value of this xattr. Max size is 64k. */ + size_t attr_size = 256; + char *val = NULL; + ssize_t sizeret; + + again: + + val = talloc_realloc(mem_ctx, val, attr_size); + if (!val) { + return False; + } + + if (fsp && fsp->fd != -1) { + sizeret = SMB_VFS_FGETXATTR(fsp, fsp->fd, ea_name, val, attr_size); + } else { + sizeret = SMB_VFS_GETXATTR(conn, fname, ea_name, val, attr_size); + } + + if (sizeret == -1 && errno == ERANGE && attr_size != 65536) { + attr_size = 65536; + goto again; + } + + if (sizeret == -1) { + return False; + } + + DEBUG(10,("get_ea_value: EA %s is of length %d: ", ea_name, sizeret)); + dump_data(10, val, sizeret); + + pea->flags = 0; + if (strnequal(ea_name, "user.", 5)) { + pea->name = &ea_name[5]; + } else { + pea->name = ea_name; + } + pea->value.data = val; + pea->value.length = (size_t)sizeret; + return True; +} + +/**************************************************************************** + Return a linked list of the total EA's. Plus a guess as to the total size + (NB. The is not the total size on the wire - we need to convert to DOS + codepage for that). +****************************************************************************/ + +static struct ea_list *get_ea_list(TALLOC_CTX *mem_ctx, connection_struct *conn, files_struct *fsp, const char *fname, size_t *pea_total_len) +{ + /* Get a list of all xattrs. Max namesize is 64k. */ + size_t ea_namelist_size = 1024; + char *ea_namelist; + char *p; + ssize_t sizeret; + int i; + struct ea_list *ea_list_head = NULL; + + if (pea_total_len) { + *pea_total_len = 0; + } + + if (!lp_ea_support(SNUM(conn))) { + return NULL; + } + + for (i = 0, ea_namelist = talloc(mem_ctx, ea_namelist_size); i < 6; + ea_namelist = talloc_realloc(mem_ctx, ea_namelist, ea_namelist_size), i++) { + if (fsp && fsp->fd != -1) { + sizeret = SMB_VFS_FLISTXATTR(fsp, fsp->fd, ea_namelist, ea_namelist_size); + } else { + sizeret = SMB_VFS_LISTXATTR(conn, fname, ea_namelist, ea_namelist_size); + } + + if (sizeret == -1 && errno == ERANGE) { + ea_namelist_size *= 2; + } else { + break; + } + } + + if (sizeret == -1) + return NULL; + + DEBUG(10,("get_ea_list: ea_namelist size = %d\n", sizeret )); + + if (sizeret) { + for (p = ea_namelist; p - ea_namelist < sizeret; p += strlen(p) + 1) { + struct ea_list *listp, *tmp; + + if (strnequal(p, "system.", 7) || samba_private_attr_name(p)) + continue; + + listp = talloc(mem_ctx, sizeof(struct ea_list)); + if (!listp) + return NULL; + + if (!get_ea_value(mem_ctx, conn, fsp, fname, p, &listp->ea)) { + return NULL; + } + + if (pea_total_len) { + *pea_total_len += 4 + strlen(p) + 1 + listp->ea.value.length; + } + DLIST_ADD_END(ea_list_head, listp, tmp); + } + } + + /* Add on 4 for total length. */ + if (pea_total_len) { + *pea_total_len += 4; + } + return ea_list_head; +} + +/**************************************************************************** + Fill a qfilepathinfo buffer with EA's. +****************************************************************************/ + +static unsigned int fill_ea_buffer(char *pdata, unsigned int total_data_size, + connection_struct *conn, files_struct *fsp, const char *fname) +{ + unsigned int ret_data_size = 4; + char *p = pdata; + size_t total_ea_len; + TALLOC_CTX *mem_ctx = talloc_init("fill_ea_buffer"); + struct ea_list *ea_list = get_ea_list(mem_ctx, conn, fsp, fname, &total_ea_len); + + SMB_ASSERT(total_data_size >= 4); + + SIVAL(pdata,0,0); + if (!mem_ctx) { + return 4; + } + + if (!ea_list) { + talloc_destroy(mem_ctx); + return 4; + } + + if (total_ea_len > total_data_size) { + talloc_destroy(mem_ctx); + return 4; + } + + total_data_size -= 4; + for (p = pdata + 4; ea_list; ea_list = ea_list->next) { + size_t dos_namelen; + fstring dos_ea_name; + push_ascii_fstring(dos_ea_name, ea_list->ea.name); + dos_namelen = strlen(dos_ea_name); + if (dos_namelen > 255 || dos_namelen == 0) { + break; + } + if (ea_list->ea.value.length > 65535) { + break; + } + if (4 + dos_namelen + 1 + ea_list->ea.value.length > total_data_size) { + break; + } + + /* We know we have room. */ + SCVAL(p,0,ea_list->ea.flags); + SCVAL(p,1,dos_namelen); + SSVAL(p,2,ea_list->ea.value.length); + fstrcpy(p+4, dos_ea_name); + memcpy( p + 4 + dos_namelen + 1, ea_list->ea.value.data, ea_list->ea.value.length); + + total_data_size -= 4 + dos_namelen + 1 + ea_list->ea.value.length; + p += 4 + dos_namelen + 1 + ea_list->ea.value.length; + } + + ret_data_size = PTR_DIFF(p, pdata); + talloc_destroy(mem_ctx); + SIVAL(pdata,0,ret_data_size); + return ret_data_size; +} + +static unsigned int estimate_ea_size(connection_struct *conn, files_struct *fsp, const char *fname) +{ + size_t total_ea_len = 0; + TALLOC_CTX *mem_ctx = talloc_init("estimate_ea_size"); + + (void)get_ea_list(mem_ctx, conn, fsp, fname, &total_ea_len); + talloc_destroy(mem_ctx); + return total_ea_len; +} + +/**************************************************************************** + Set or delete an extended attribute. +****************************************************************************/ + +static NTSTATUS set_ea(connection_struct *conn, files_struct *fsp, const char *fname, + char *pdata, int total_data) +{ + unsigned int namelen; + unsigned int ealen; + int ret; + fstring unix_ea_name; + + if (!lp_ea_support(SNUM(conn))) { + return NT_STATUS_EAS_NOT_SUPPORTED; + } + + if (total_data < 8) { + return NT_STATUS_INVALID_PARAMETER; + } + + if (IVAL(pdata,0) > total_data) { + DEBUG(10,("set_ea: bad total data size (%u) > %u\n", IVAL(pdata,0), (unsigned int)total_data)); + return NT_STATUS_INVALID_PARAMETER; + } + + pdata += 4; + namelen = CVAL(pdata,1); + ealen = SVAL(pdata,2); + pdata += 4; + if (total_data < 8 + namelen + 1 + ealen) { + DEBUG(10,("set_ea: bad total data size (%u) < 8 + namelen (%u) + 1 + ealen (%u)\n", + (unsigned int)total_data, namelen, ealen)); + return NT_STATUS_INVALID_PARAMETER; + } + + if (pdata[namelen] != '\0') { + DEBUG(10,("set_ea: ea name not null terminated\n")); + return NT_STATUS_INVALID_PARAMETER; + } + + fstrcpy(unix_ea_name, "user."); /* All EA's must start with user. */ + pull_ascii(&unix_ea_name[5], pdata, sizeof(fstring) - 5, -1, STR_TERMINATE); + pdata += (namelen + 1); + + DEBUG(10,("set_ea: ea_name %s ealen = %u\n", unix_ea_name, ealen)); + if (ealen) { + DEBUG(10,("set_ea: data :\n")); + dump_data(10, pdata, ealen); + } + + if (samba_private_attr_name(unix_ea_name)) { + DEBUG(10,("set_ea: ea name %s is a private Samba name.\n", unix_ea_name)); + return NT_STATUS_ACCESS_DENIED; + } + + if (ealen == 0) { + /* Remove the attribute. */ + if (fsp && (fsp->fd != -1)) { + DEBUG(10,("set_ea: deleting ea name %s on file %s by file descriptor.\n", + unix_ea_name, fsp->fsp_name)); + ret = SMB_VFS_FREMOVEXATTR(fsp, fsp->fd, unix_ea_name); + } else { + DEBUG(10,("set_ea: deleting ea name %s on file %s.\n", + unix_ea_name, fname)); + ret = SMB_VFS_REMOVEXATTR(conn, fname, unix_ea_name); + } +#ifdef ENOATTR + /* Removing a non existent attribute always succeeds. */ + DEBUG(10,("set_ea: deleting ea name %s didn't exist - succeeding by default.\n", unix_ea_name)); + if (ret == -1 && errno == ENOATTR) { + ret = 0; + } +#endif + } else { + if (fsp && (fsp->fd != -1)) { + DEBUG(10,("set_ea: setting ea name %s on file %s by file descriptor.\n", + unix_ea_name, fsp->fsp_name)); + ret = SMB_VFS_FSETXATTR(fsp, fsp->fd, unix_ea_name, pdata, ealen, 0); + } else { + DEBUG(10,("set_ea: setting ea name %s on file %s.\n", + unix_ea_name, fname)); + ret = SMB_VFS_SETXATTR(conn, fname, unix_ea_name, pdata, ealen, 0); + } + } + + if (ret == -1) { + if (errno == ENOTSUP) { + return NT_STATUS_EAS_NOT_SUPPORTED; + } + return map_nt_error_from_unix(errno); + } + + return NT_STATUS_OK; +} + +/**************************************************************************** Send the required number of replies back. We assume all fields other than the data fields are set correctly for the type of call. @@ -2048,8 +2366,8 @@ static int call_trans2qfilepathinfo(connection_struct *conn, break; case SMB_INFO_QUERY_ALL_EAS: - data_size = 4; - SIVAL(pdata,0,0); /* ea size */ + /* We have data_size bytes to put EA's into. */ + data_size = fill_ea_buffer(pdata, data_size, conn, fsp, fname); break; case SMB_FILE_BASIC_INFORMATION: @@ -2095,8 +2413,12 @@ static int call_trans2qfilepathinfo(connection_struct *conn, case SMB_FILE_EA_INFORMATION: case SMB_QUERY_FILE_EA_INFO: + { + unsigned int ea_size = estimate_ea_size(conn, fsp, fname); data_size = 4; + SIVAL(pdata,0,ea_size); break; + } /* Get the 8.3 name - used if NT SMB was negotiated. */ case SMB_QUERY_FILE_ALT_NAME_INFO: @@ -2703,7 +3025,10 @@ static int call_trans2setfilepathinfo(connection_struct *conn, } case SMB_INFO_SET_EA: - return(ERROR_DOS(ERRDOS,ERReasnotsupported)); + status = set_ea(conn, fsp, fname, pdata, total_data); + if (NT_STATUS_V(status) != NT_STATUS_V(NT_STATUS_OK)) + return ERROR_NT(status); + break; /* XXXX um, i don't think this is right. it's also not in the cifs6.txt spec. |