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Diffstat (limited to 'librpc/rpc/binding.c')
| -rw-r--r-- | librpc/rpc/binding.c | 1459 |
1 files changed, 1459 insertions, 0 deletions
diff --git a/librpc/rpc/binding.c b/librpc/rpc/binding.c new file mode 100644 index 0000000..3e2a446 --- /dev/null +++ b/librpc/rpc/binding.c @@ -0,0 +1,1459 @@ +/* + Unix SMB/CIFS implementation. + + dcerpc utility functions + + Copyright (C) Andrew Tridgell 2003 + Copyright (C) Jelmer Vernooij 2004 + Copyright (C) Andrew Bartlett <abartlet@samba.org> 2005 + Copyright (C) Rafal Szczesniak 2006 + Copyright (C) Stefan Metzmacher 2014 + + 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 <http://www.gnu.org/licenses/>. +*/ + +#include "includes.h" +#include "../../lib/util/util_net.h" +#include "librpc/gen_ndr/ndr_epmapper.h" +#include "librpc/gen_ndr/ndr_misc.h" +#include "librpc/rpc/dcerpc.h" +#include "rpc_common.h" + +#undef strcasecmp +#undef strncasecmp + +#define MAX_PROTSEQ 10 + +struct dcerpc_binding { + enum dcerpc_transport_t transport; + struct GUID object; + const char *object_string; + const char *host; + const char *target_hostname; + const char *target_principal; + const char *endpoint; + const char **options; + uint32_t flags; + uint32_t assoc_group_id; + char assoc_group_string[11]; /* 0x3456789a + '\0' */ +}; + +static const struct { + const char *name; + enum dcerpc_transport_t transport; + int num_protocols; + enum epm_protocol protseq[MAX_PROTSEQ]; +} transports[] = { + { "ncacn_np", NCACN_NP, 3, + { EPM_PROTOCOL_NCACN, EPM_PROTOCOL_SMB, EPM_PROTOCOL_NETBIOS }}, + { "ncacn_ip_tcp", NCACN_IP_TCP, 3, + { EPM_PROTOCOL_NCACN, EPM_PROTOCOL_TCP, EPM_PROTOCOL_IP } }, + { "ncacn_http", NCACN_HTTP, 3, + { EPM_PROTOCOL_NCACN, EPM_PROTOCOL_HTTP, EPM_PROTOCOL_IP } }, + { "ncadg_ip_udp", NCACN_IP_UDP, 3, + { EPM_PROTOCOL_NCADG, EPM_PROTOCOL_UDP, EPM_PROTOCOL_IP } }, + { "ncalrpc", NCALRPC, 2, + { EPM_PROTOCOL_NCALRPC, EPM_PROTOCOL_NAMED_PIPE } }, + { "ncacn_unix_stream", NCACN_UNIX_STREAM, 2, + { EPM_PROTOCOL_NCACN, EPM_PROTOCOL_UNIX_DS } }, + { "ncadg_unix_dgram", NCADG_UNIX_DGRAM, 2, + { EPM_PROTOCOL_NCADG, EPM_PROTOCOL_UNIX_DS } }, + { "ncacn_at_dsp", NCACN_AT_DSP, 3, + { EPM_PROTOCOL_NCACN, EPM_PROTOCOL_APPLETALK, EPM_PROTOCOL_DSP } }, + { "ncadg_at_ddp", NCADG_AT_DDP, 3, + { EPM_PROTOCOL_NCADG, EPM_PROTOCOL_APPLETALK, EPM_PROTOCOL_DDP } }, + { "ncacn_vns_ssp", NCACN_VNS_SPP, 3, + { EPM_PROTOCOL_NCACN, EPM_PROTOCOL_STREETTALK, EPM_PROTOCOL_VINES_SPP } }, + { "ncacn_vns_ipc", NCACN_VNS_IPC, 3, + { EPM_PROTOCOL_NCACN, EPM_PROTOCOL_STREETTALK, EPM_PROTOCOL_VINES_IPC }, }, + { "ncadg_ipx", NCADG_IPX, 2, + { EPM_PROTOCOL_NCADG, EPM_PROTOCOL_IPX }, + }, + { "ncacn_spx", NCACN_SPX, 3, + /* I guess some MS programmer confused the identifier for + * EPM_PROTOCOL_UUID (0x0D or 13) with the one for + * EPM_PROTOCOL_SPX (0x13) here. -- jelmer*/ + { EPM_PROTOCOL_NCACN, EPM_PROTOCOL_NCALRPC, EPM_PROTOCOL_UUID }, + }, +}; + +static const struct ncacn_option { + const char *name; + uint32_t flag; +} ncacn_options[] = { + {"sign", DCERPC_SIGN}, + {"seal", DCERPC_SEAL}, + {"connect", DCERPC_CONNECT}, + {"spnego", DCERPC_AUTH_SPNEGO}, + {"ntlm", DCERPC_AUTH_NTLM}, + {"krb5", DCERPC_AUTH_KRB5}, + {"schannel", DCERPC_SCHANNEL | DCERPC_SCHANNEL_AUTO}, + {"validate", DCERPC_DEBUG_VALIDATE_BOTH}, + {"print", DCERPC_DEBUG_PRINT_BOTH}, + {"padcheck", DCERPC_DEBUG_PAD_CHECK}, + {"bigendian", DCERPC_PUSH_BIGENDIAN}, + {"smb1", DCERPC_SMB1}, + {"smb2", DCERPC_SMB2}, + {"ndr64", DCERPC_NDR64}, + {"packet", DCERPC_PACKET}, +}; + +static const struct ncacn_option *ncacn_option_by_name(const char *name) +{ + size_t i; + + for (i=0; i<ARRAY_SIZE(ncacn_options); i++) { + int ret; + + ret = strcasecmp(ncacn_options[i].name, name); + if (ret != 0) { + continue; + } + + return &ncacn_options[i]; + } + + return NULL; +} + +const char *epm_floor_string(TALLOC_CTX *mem_ctx, struct epm_floor *epm_floor) +{ + struct ndr_syntax_id syntax; + NTSTATUS status; + + switch(epm_floor->lhs.protocol) { + case EPM_PROTOCOL_UUID: + status = dcerpc_floor_get_lhs_data(epm_floor, &syntax); + if (NT_STATUS_IS_OK(status)) { + /* lhs is used: UUID */ + struct GUID_txt_buf buf; + + if (GUID_equal(&syntax.uuid, &ndr_transfer_syntax_ndr.uuid)) { + return "NDR"; + } + + if (GUID_equal(&syntax.uuid, &ndr_transfer_syntax_ndr64.uuid)) { + return "NDR64"; + } + + return talloc_asprintf( + mem_ctx, + " uuid %s/0x%02x", + GUID_buf_string(&syntax.uuid, &buf), + syntax.if_version); + } else { /* IPX */ + return talloc_asprintf(mem_ctx, "IPX:%s", + data_blob_hex_string_upper(mem_ctx, &epm_floor->rhs.uuid.unknown)); + } + + case EPM_PROTOCOL_NCACN: + return "RPC-C"; + + case EPM_PROTOCOL_NCADG: + return "RPC"; + + case EPM_PROTOCOL_NCALRPC: + return "NCALRPC"; + + case EPM_PROTOCOL_DNET_NSP: + return "DNET/NSP"; + + case EPM_PROTOCOL_IP: + return talloc_asprintf(mem_ctx, "IP:%s", epm_floor->rhs.ip.ipaddr); + + case EPM_PROTOCOL_NAMED_PIPE: + return talloc_asprintf(mem_ctx, "NAMED-PIPE:%s", epm_floor->rhs.named_pipe.path); + + case EPM_PROTOCOL_SMB: + return talloc_asprintf(mem_ctx, "SMB:%s", epm_floor->rhs.smb.unc); + + case EPM_PROTOCOL_UNIX_DS: + return talloc_asprintf(mem_ctx, "Unix:%s", epm_floor->rhs.unix_ds.path); + + case EPM_PROTOCOL_NETBIOS: + return talloc_asprintf(mem_ctx, "NetBIOS:%s", epm_floor->rhs.netbios.name); + + case EPM_PROTOCOL_NETBEUI: + return "NETBeui"; + + case EPM_PROTOCOL_SPX: + return "SPX"; + + case EPM_PROTOCOL_NB_IPX: + return "NB_IPX"; + + case EPM_PROTOCOL_HTTP: + return talloc_asprintf(mem_ctx, "HTTP:%d", epm_floor->rhs.http.port); + + case EPM_PROTOCOL_TCP: + return talloc_asprintf(mem_ctx, "TCP:%d", epm_floor->rhs.tcp.port); + + case EPM_PROTOCOL_UDP: + return talloc_asprintf(mem_ctx, "UDP:%d", epm_floor->rhs.udp.port); + + default: + return talloc_asprintf(mem_ctx, "UNK(%02x):", epm_floor->lhs.protocol); + } +} + + +/* + form a binding string from a binding structure +*/ +_PUBLIC_ char *dcerpc_binding_string(TALLOC_CTX *mem_ctx, const struct dcerpc_binding *b) +{ + char *s = NULL; + size_t i; + const char *t_name = NULL; + bool option_section = false; + const char *target_hostname = NULL; + + if (b->transport != NCA_UNKNOWN) { + t_name = derpc_transport_string_by_transport(b->transport); + if (!t_name) { + return NULL; + } + } + + s = talloc_strdup(mem_ctx, ""); + + if (!GUID_all_zero(&b->object)) { + struct GUID_txt_buf buf; + talloc_asprintf_addbuf( + &s, "%s@", GUID_buf_string(&b->object, &buf)); + } + + if (t_name != NULL) { + talloc_asprintf_addbuf(&s, "%s:", t_name); + } + + if (b->host) { + talloc_asprintf_addbuf(&s, "%s", b->host); + } + + target_hostname = b->target_hostname; + if (target_hostname != NULL && b->host != NULL) { + if (strcmp(target_hostname, b->host) == 0) { + target_hostname = NULL; + } + } + + option_section = + (b->endpoint != NULL) || + (target_hostname != NULL) || + (b->target_principal != NULL) || + (b->assoc_group_id != 0) || + (b->options != NULL) || + (b->flags != 0); + + if (!option_section) { + return s; + } + + talloc_asprintf_addbuf(&s, "["); + + if (b->endpoint) { + talloc_asprintf_addbuf(&s, "%s", b->endpoint); + } + + for (i=0;i<ARRAY_SIZE(ncacn_options);i++) { + if (!(b->flags & ncacn_options[i].flag)) { + continue; + } + + talloc_asprintf_addbuf(&s, ",%s", ncacn_options[i].name); + } + + if (target_hostname) { + talloc_asprintf_addbuf( + &s, ",target_hostname=%s", b->target_hostname); + } + + if (b->target_principal) { + talloc_asprintf_addbuf( + &s, ",target_principal=%s", b->target_principal); + } + + if (b->assoc_group_id != 0) { + talloc_asprintf_addbuf( + &s, ",assoc_group_id=0x%08x", b->assoc_group_id); + } + + for (i=0;b->options && b->options[i];i++) { + talloc_asprintf_addbuf(&s, ",%s", b->options[i]); + } + + talloc_asprintf_addbuf(&s, "]"); + + return s; +} + +/* + parse a binding string into a dcerpc_binding structure +*/ +_PUBLIC_ NTSTATUS dcerpc_parse_binding(TALLOC_CTX *mem_ctx, const char *_s, struct dcerpc_binding **b_out) +{ + char *_t; + struct dcerpc_binding *b; + char *s; + char *options = NULL; + char *p; + size_t i; + NTSTATUS status; + + b = talloc_zero(mem_ctx, struct dcerpc_binding); + if (!b) { + return NT_STATUS_NO_MEMORY; + } + + _t = talloc_strdup(b, _s); + if (_t == NULL) { + talloc_free(b); + return NT_STATUS_NO_MEMORY; + } + + s = _t; + + p = strchr(s, '['); + if (p) { + char *q = p + strlen(p) - 1; + if (*q != ']') { + talloc_free(b); + return NT_STATUS_INVALID_PARAMETER_MIX; + } + *p = '\0'; + *q = '\0'; + options = p + 1; + } + + p = strchr(s, '@'); + + if (p && PTR_DIFF(p, s) == 36) { /* 36 is the length of a UUID */ + *p = '\0'; + + status = dcerpc_binding_set_string_option(b, "object", s); + if (!NT_STATUS_IS_OK(status)) { + talloc_free(b); + return status; + } + + s = p + 1; + } + + p = strchr(s, ':'); + + if (p == NULL) { + b->transport = NCA_UNKNOWN; + } else if (is_ipaddress_v6(s)) { + b->transport = NCA_UNKNOWN; + } else { + *p = '\0'; + + status = dcerpc_binding_set_string_option(b, "transport", s); + if (!NT_STATUS_IS_OK(status)) { + talloc_free(b); + return status; + } + + s = p + 1; + } + + if (strlen(s) > 0) { + status = dcerpc_binding_set_string_option(b, "host", s); + if (!NT_STATUS_IS_OK(status)) { + talloc_free(b); + return status; + } + + b->target_hostname = talloc_strdup(b, b->host); + if (b->target_hostname == NULL) { + talloc_free(b); + return NT_STATUS_NO_MEMORY; + } + } + + for (i=0; options != NULL; i++) { + const char *name = options; + const char *value = NULL; + + p = strchr(options, ','); + if (p != NULL) { + *p = '\0'; + options = p+1; + } else { + options = NULL; + } + + p = strchr(name, '='); + if (p != NULL) { + *p = '\0'; + value = p + 1; + } + + if (value == NULL) { + /* + * If it's not a key=value pair + * it might be a ncacn_option + * or if it's the first option + * it's the endpoint. + */ + const struct ncacn_option *no = NULL; + + value = name; + + no = ncacn_option_by_name(name); + if (no == NULL) { + if (i > 0) { + /* + * we don't allow unknown options + */ + return NT_STATUS_INVALID_PARAMETER_MIX; + } + + /* + * This is the endpoint + */ + name = "endpoint"; + if (strlen(value) == 0) { + value = NULL; + } + } + } + + status = dcerpc_binding_set_string_option(b, name, value); + if (!NT_STATUS_IS_OK(status)) { + talloc_free(b); + return status; + } + } + + talloc_free(_t); + *b_out = b; + return NT_STATUS_OK; +} + +_PUBLIC_ struct GUID dcerpc_binding_get_object(const struct dcerpc_binding *b) +{ + return b->object; +} + +_PUBLIC_ NTSTATUS dcerpc_binding_set_object(struct dcerpc_binding *b, + struct GUID object) +{ + char *tmp = discard_const_p(char, b->object_string); + + if (GUID_all_zero(&object)) { + talloc_free(tmp); + b->object_string = NULL; + ZERO_STRUCT(b->object); + return NT_STATUS_OK; + } + + b->object_string = GUID_string(b, &object); + if (b->object_string == NULL) { + b->object_string = tmp; + return NT_STATUS_NO_MEMORY; + } + talloc_free(tmp); + + b->object = object; + return NT_STATUS_OK; +} + +_PUBLIC_ enum dcerpc_transport_t dcerpc_binding_get_transport(const struct dcerpc_binding *b) +{ + return b->transport; +} + +_PUBLIC_ NTSTATUS dcerpc_binding_set_transport(struct dcerpc_binding *b, + enum dcerpc_transport_t transport) +{ + NTSTATUS status; + + /* + * TODO: we may want to check the transport value is + * wellknown. + */ + if (b->transport == transport) { + return NT_STATUS_OK; + } + + /* + * This implicitly resets the endpoint + * as the endpoint is transport specific. + * + * It also resets the assoc group as it's + * also endpoint specific. + * + * TODO: in future we may reset more options + * here. + */ + status = dcerpc_binding_set_string_option(b, "endpoint", NULL); + if (!NT_STATUS_IS_OK(status)) { + return status; + } + + b->assoc_group_id = 0; + + b->transport = transport; + return NT_STATUS_OK; +} + +_PUBLIC_ void dcerpc_binding_get_auth_info(const struct dcerpc_binding *b, + enum dcerpc_AuthType *_auth_type, + enum dcerpc_AuthLevel *_auth_level) +{ + enum dcerpc_AuthType auth_type; + enum dcerpc_AuthLevel auth_level; + + if (b->flags & DCERPC_AUTH_SPNEGO) { + auth_type = DCERPC_AUTH_TYPE_SPNEGO; + } else if (b->flags & DCERPC_AUTH_KRB5) { + auth_type = DCERPC_AUTH_TYPE_KRB5; + } else if (b->flags & DCERPC_SCHANNEL) { + auth_type = DCERPC_AUTH_TYPE_SCHANNEL; + } else if (b->flags & DCERPC_AUTH_NTLM) { + auth_type = DCERPC_AUTH_TYPE_NTLMSSP; + } else { + auth_type = DCERPC_AUTH_TYPE_NONE; + } + + if (b->flags & DCERPC_SEAL) { + auth_level = DCERPC_AUTH_LEVEL_PRIVACY; + } else if (b->flags & DCERPC_SIGN) { + auth_level = DCERPC_AUTH_LEVEL_INTEGRITY; + } else if (b->flags & DCERPC_CONNECT) { + auth_level = DCERPC_AUTH_LEVEL_CONNECT; + } else if (b->flags & DCERPC_PACKET) { + auth_level = DCERPC_AUTH_LEVEL_PACKET; + } else if (auth_type != DCERPC_AUTH_TYPE_NONE) { + auth_level = DCERPC_AUTH_LEVEL_INTEGRITY; + } else { + auth_level = DCERPC_AUTH_LEVEL_NONE; + } + + if (_auth_type != NULL) { + *_auth_type = auth_type; + } + + if (_auth_level != NULL) { + *_auth_level = auth_level; + } +} + +_PUBLIC_ uint32_t dcerpc_binding_get_assoc_group_id(const struct dcerpc_binding *b) +{ + return b->assoc_group_id; +} + +_PUBLIC_ NTSTATUS dcerpc_binding_set_assoc_group_id(struct dcerpc_binding *b, + uint32_t assoc_group_id) +{ + b->assoc_group_id = assoc_group_id; + return NT_STATUS_OK; +} + +_PUBLIC_ struct ndr_syntax_id dcerpc_binding_get_abstract_syntax(const struct dcerpc_binding *b) +{ + const char *s = dcerpc_binding_get_string_option(b, "abstract_syntax"); + bool ok; + struct ndr_syntax_id id; + + if (s == NULL) { + return ndr_syntax_id_null; + } + + ok = ndr_syntax_id_from_string(s, &id); + if (!ok) { + return ndr_syntax_id_null; + } + + return id; +} + +_PUBLIC_ NTSTATUS dcerpc_binding_set_abstract_syntax(struct dcerpc_binding *b, + const struct ndr_syntax_id *syntax) +{ + NTSTATUS status; + struct ndr_syntax_id_buf buf; + + if (syntax == NULL) { + status = dcerpc_binding_set_string_option(b, "abstract_syntax", NULL); + return status; + } + + if (ndr_syntax_id_equal(&ndr_syntax_id_null, syntax)) { + status = dcerpc_binding_set_string_option(b, "abstract_syntax", NULL); + return status; + } + + status = dcerpc_binding_set_string_option( + b, "abstract_syntax", ndr_syntax_id_buf_string(syntax, &buf)); + return status; +} + +_PUBLIC_ const char *dcerpc_binding_get_string_option(const struct dcerpc_binding *b, + const char *name) +{ + struct { + const char *name; + const char *value; +#define _SPECIAL(x) { .name = #x, .value = b->x, } + } specials[] = { + { .name = "object", .value = b->object_string, }, + _SPECIAL(host), + _SPECIAL(endpoint), + _SPECIAL(target_hostname), + _SPECIAL(target_principal), +#undef _SPECIAL + }; + const struct ncacn_option *no = NULL; + size_t name_len = strlen(name); + size_t i; + int ret; + + ret = strcmp(name, "transport"); + if (ret == 0) { + return derpc_transport_string_by_transport(b->transport); + } + + ret = strcmp(name, "assoc_group_id"); + if (ret == 0) { + char *tmp = discard_const_p(char, b->assoc_group_string); + + if (b->assoc_group_id == 0) { + return NULL; + } + + snprintf(tmp, sizeof(b->assoc_group_string), + "0x%08x", b->assoc_group_id); + return (const char *)b->assoc_group_string; + } + + for (i=0; i < ARRAY_SIZE(specials); i++) { + ret = strcmp(specials[i].name, name); + if (ret != 0) { + continue; + } + + return specials[i].value; + } + + no = ncacn_option_by_name(name); + if (no != NULL) { + if (b->flags & no->flag) { + return no->name; + } + + return NULL; + } + + if (b->options == NULL) { + return NULL; + } + + for (i=0; b->options[i]; i++) { + const char *o = b->options[i]; + const char *vs = NULL; + + ret = strncmp(name, o, name_len); + if (ret != 0) { + continue; + } + + if (o[name_len] != '=') { + continue; + } + + vs = &o[name_len + 1]; + + return vs; + } + + return NULL; +} + +_PUBLIC_ char *dcerpc_binding_copy_string_option(TALLOC_CTX *mem_ctx, + const struct dcerpc_binding *b, + const char *name) +{ + const char *c = dcerpc_binding_get_string_option(b, name); + char *v; + + if (c == NULL) { + errno = ENOENT; + return NULL; + } + + v = talloc_strdup(mem_ctx, c); + if (v == NULL) { + errno = ENOMEM; + return NULL; + } + + return v; +} + +_PUBLIC_ NTSTATUS dcerpc_binding_set_string_option(struct dcerpc_binding *b, + const char *name, + const char *value) +{ + struct { + const char *name; + const char **ptr; +#define _SPECIAL(x) { .name = #x, .ptr = &b->x, } + } specials[] = { + _SPECIAL(host), + _SPECIAL(endpoint), + _SPECIAL(target_hostname), + _SPECIAL(target_principal), +#undef _SPECIAL + }; + const struct ncacn_option *no = NULL; + size_t name_len = strlen(name); + const char *opt = NULL; + char *tmp; + size_t i; + int ret; + + /* + * Note: value == NULL, means delete it. + * value != NULL means add or reset. + */ + + ret = strcmp(name, "transport"); + if (ret == 0) { + enum dcerpc_transport_t t = dcerpc_transport_by_name(value); + + if (t == NCA_UNKNOWN && value != NULL) { + return NT_STATUS_INVALID_PARAMETER_MIX; + } + + return dcerpc_binding_set_transport(b, t); + } + + ret = strcmp(name, "object"); + if (ret == 0) { + NTSTATUS status; + struct GUID uuid = GUID_zero(); + + if (value != NULL) { + DATA_BLOB blob; + blob = data_blob_string_const(value); + if (blob.length != 36) { + return NT_STATUS_INVALID_PARAMETER_MIX; + } + + status = GUID_from_data_blob(&blob, &uuid); + if (!NT_STATUS_IS_OK(status)) { + return status; + } + } + + return dcerpc_binding_set_object(b, uuid); + } + + ret = strcmp(name, "assoc_group_id"); + if (ret == 0) { + uint32_t assoc_group_id = 0; + + if (value != NULL) { + char c; + + ret = sscanf(value, "0x%08x%c", &assoc_group_id, &c); + if (ret != 1) { + return NT_STATUS_INVALID_PARAMETER_MIX; + } + } + + return dcerpc_binding_set_assoc_group_id(b, assoc_group_id); + } + + for (i=0; i < ARRAY_SIZE(specials); i++) { + ret = strcmp(specials[i].name, name); + if (ret != 0) { + continue; + } + + tmp = discard_const_p(char, *specials[i].ptr); + + if (value == NULL) { + talloc_free(tmp); + *specials[i].ptr = NULL; + return NT_STATUS_OK; + } + + if (value[0] == '\0') { + return NT_STATUS_INVALID_PARAMETER_MIX; + } + + *specials[i].ptr = talloc_strdup(b, value); + if (*specials[i].ptr == NULL) { + *specials[i].ptr = tmp; + return NT_STATUS_NO_MEMORY; + } + talloc_free(tmp); + + return NT_STATUS_OK; + } + + no = ncacn_option_by_name(name); + if (no != NULL) { + if (value == NULL) { + b->flags &= ~no->flag; + return NT_STATUS_OK; + } + + ret = strcasecmp(no->name, value); + if (ret != 0) { + return NT_STATUS_INVALID_PARAMETER_MIX; + } + + b->flags |= no->flag; + return NT_STATUS_OK; + } + + for (i=0; b->options && b->options[i]; i++) { + const char *o = b->options[i]; + + ret = strncmp(name, o, name_len); + if (ret != 0) { + continue; + } + + if (o[name_len] != '=') { + continue; + } + + opt = o; + break; + } + + if (opt == NULL) { + const char **n; + + if (value == NULL) { + return NT_STATUS_OK; + } + + n = talloc_realloc(b, b->options, const char *, i + 2); + if (n == NULL) { + return NT_STATUS_NO_MEMORY; + } + n[i] = NULL; + n[i + 1] = NULL; + b->options = n; + } + + tmp = discard_const_p(char, opt); + + if (value == NULL) { + for (;b->options[i];i++) { + b->options[i] = b->options[i+1]; + } + talloc_free(tmp); + return NT_STATUS_OK; + } + + b->options[i] = talloc_asprintf(b->options, "%s=%s", + name, value); + if (b->options[i] == NULL) { + b->options[i] = tmp; + return NT_STATUS_NO_MEMORY; + } + + return NT_STATUS_OK; +} + +_PUBLIC_ uint32_t dcerpc_binding_get_flags(const struct dcerpc_binding *b) +{ + return b->flags; +} + +_PUBLIC_ NTSTATUS dcerpc_binding_set_flags(struct dcerpc_binding *b, + uint32_t additional, + uint32_t clear) +{ + /* + * TODO: in future we may want to reject invalid combinations + */ + b->flags &= ~clear; + b->flags |= additional; + + return NT_STATUS_OK; +} + +_PUBLIC_ NTSTATUS dcerpc_floor_get_lhs_data(const struct epm_floor *epm_floor, + struct ndr_syntax_id *syntax) +{ + TALLOC_CTX *mem_ctx = talloc_init("floor_get_lhs_data"); + struct ndr_pull *ndr; + enum ndr_err_code ndr_err; + uint16_t if_version=0; + + ndr = ndr_pull_init_blob(&epm_floor->lhs.lhs_data, mem_ctx); + if (ndr == NULL) { + talloc_free(mem_ctx); + return NT_STATUS_NO_MEMORY; + } + ndr->flags |= LIBNDR_FLAG_NOALIGN; + + ndr_err = ndr_pull_GUID(ndr, NDR_SCALARS | NDR_BUFFERS, &syntax->uuid); + if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) { + talloc_free(mem_ctx); + return ndr_map_error2ntstatus(ndr_err); + } + + ndr_err = ndr_pull_uint16(ndr, NDR_SCALARS, &if_version); + if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) { + talloc_free(mem_ctx); + return ndr_map_error2ntstatus(ndr_err); + } + + syntax->if_version = if_version; + + talloc_free(mem_ctx); + + return NT_STATUS_OK; +} + +static DATA_BLOB dcerpc_floor_pack_lhs_data(TALLOC_CTX *mem_ctx, const struct ndr_syntax_id *syntax) +{ + DATA_BLOB blob; + enum ndr_err_code ndr_err; + struct ndr_push *ndr; + + ndr = ndr_push_init_ctx(mem_ctx); + if (ndr == NULL) { + return data_blob_null; + } + + ndr->flags |= LIBNDR_FLAG_NOALIGN; + + ndr_err = ndr_push_GUID(ndr, NDR_SCALARS | NDR_BUFFERS, &syntax->uuid); + if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) { + return data_blob_null; + } + ndr_err = ndr_push_uint16(ndr, NDR_SCALARS, syntax->if_version); + if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) { + return data_blob_null; + } + + blob = ndr_push_blob(ndr); + talloc_steal(mem_ctx, blob.data); + talloc_free(ndr); + return blob; +} + +static bool dcerpc_floor_pack_rhs_if_version_data( + TALLOC_CTX *mem_ctx, const struct ndr_syntax_id *syntax, + DATA_BLOB *pblob) +{ + DATA_BLOB blob; + struct ndr_push *ndr = ndr_push_init_ctx(mem_ctx); + enum ndr_err_code ndr_err; + + if (ndr == NULL) { + return false; + } + + ndr->flags |= LIBNDR_FLAG_NOALIGN; + + ndr_err = ndr_push_uint16(ndr, NDR_SCALARS, syntax->if_version >> 16); + if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) { + return false; + } + + blob = ndr_push_blob(ndr); + talloc_steal(mem_ctx, blob.data); + talloc_free(ndr); + *pblob = blob; + return true; +} + +char *dcerpc_floor_get_rhs_data(TALLOC_CTX *mem_ctx, struct epm_floor *epm_floor) +{ + switch (epm_floor->lhs.protocol) { + case EPM_PROTOCOL_TCP: + if (epm_floor->rhs.tcp.port == 0) return NULL; + return talloc_asprintf(mem_ctx, "%d", epm_floor->rhs.tcp.port); + + case EPM_PROTOCOL_UDP: + if (epm_floor->rhs.udp.port == 0) return NULL; + return talloc_asprintf(mem_ctx, "%d", epm_floor->rhs.udp.port); + + case EPM_PROTOCOL_HTTP: + if (epm_floor->rhs.http.port == 0) return NULL; + return talloc_asprintf(mem_ctx, "%d", epm_floor->rhs.http.port); + + case EPM_PROTOCOL_IP: + return talloc_strdup(mem_ctx, epm_floor->rhs.ip.ipaddr); + + case EPM_PROTOCOL_NCACN: + return NULL; + + case EPM_PROTOCOL_NCADG: + return NULL; + + case EPM_PROTOCOL_SMB: + if (strlen(epm_floor->rhs.smb.unc) == 0) return NULL; + return talloc_strdup(mem_ctx, epm_floor->rhs.smb.unc); + + case EPM_PROTOCOL_NAMED_PIPE: + if (strlen(epm_floor->rhs.named_pipe.path) == 0) return NULL; + return talloc_strdup(mem_ctx, epm_floor->rhs.named_pipe.path); + + case EPM_PROTOCOL_NETBIOS: + if (strlen(epm_floor->rhs.netbios.name) == 0) return NULL; + return talloc_strdup(mem_ctx, epm_floor->rhs.netbios.name); + + case EPM_PROTOCOL_NCALRPC: + return NULL; + + case EPM_PROTOCOL_VINES_SPP: + return talloc_asprintf(mem_ctx, "%d", epm_floor->rhs.vines_spp.port); + + case EPM_PROTOCOL_VINES_IPC: + return talloc_asprintf(mem_ctx, "%d", epm_floor->rhs.vines_ipc.port); + + case EPM_PROTOCOL_STREETTALK: + return talloc_strdup(mem_ctx, epm_floor->rhs.streettalk.streettalk); + + case EPM_PROTOCOL_UNIX_DS: + if (strlen(epm_floor->rhs.unix_ds.path) == 0) return NULL; + return talloc_strdup(mem_ctx, epm_floor->rhs.unix_ds.path); + + case EPM_PROTOCOL_NULL: + return NULL; + + default: + DEBUG(0,("Unsupported lhs protocol %d\n", epm_floor->lhs.protocol)); + break; + } + + return NULL; +} + +static NTSTATUS dcerpc_floor_set_rhs_data(TALLOC_CTX *mem_ctx, + struct epm_floor *epm_floor, + const char *data) +{ + if (data == NULL) { + data = ""; + } + + switch (epm_floor->lhs.protocol) { + case EPM_PROTOCOL_TCP: + epm_floor->rhs.tcp.port = atoi(data); + return NT_STATUS_OK; + + case EPM_PROTOCOL_UDP: + epm_floor->rhs.udp.port = atoi(data); + return NT_STATUS_OK; + + case EPM_PROTOCOL_HTTP: + epm_floor->rhs.http.port = atoi(data); + return NT_STATUS_OK; + + case EPM_PROTOCOL_IP: + if (!is_ipaddress_v4(data)) { + data = "0.0.0.0"; + } + epm_floor->rhs.ip.ipaddr = talloc_strdup(mem_ctx, data); + NT_STATUS_HAVE_NO_MEMORY(epm_floor->rhs.ip.ipaddr); + return NT_STATUS_OK; + + case EPM_PROTOCOL_NCACN: + epm_floor->rhs.ncacn.minor_version = 0; + return NT_STATUS_OK; + + case EPM_PROTOCOL_NCADG: + epm_floor->rhs.ncadg.minor_version = 0; + return NT_STATUS_OK; + + case EPM_PROTOCOL_SMB: + epm_floor->rhs.smb.unc = talloc_strdup(mem_ctx, data); + NT_STATUS_HAVE_NO_MEMORY(epm_floor->rhs.smb.unc); + return NT_STATUS_OK; + + case EPM_PROTOCOL_NAMED_PIPE: + epm_floor->rhs.named_pipe.path = talloc_strdup(mem_ctx, data); + NT_STATUS_HAVE_NO_MEMORY(epm_floor->rhs.named_pipe.path); + return NT_STATUS_OK; + + case EPM_PROTOCOL_NETBIOS: + epm_floor->rhs.netbios.name = talloc_strdup(mem_ctx, data); + NT_STATUS_HAVE_NO_MEMORY(epm_floor->rhs.netbios.name); + return NT_STATUS_OK; + + case EPM_PROTOCOL_NCALRPC: + return NT_STATUS_OK; + + case EPM_PROTOCOL_VINES_SPP: + epm_floor->rhs.vines_spp.port = atoi(data); + return NT_STATUS_OK; + + case EPM_PROTOCOL_VINES_IPC: + epm_floor->rhs.vines_ipc.port = atoi(data); + return NT_STATUS_OK; + + case EPM_PROTOCOL_STREETTALK: + epm_floor->rhs.streettalk.streettalk = talloc_strdup(mem_ctx, data); + NT_STATUS_HAVE_NO_MEMORY(epm_floor->rhs.streettalk.streettalk); + return NT_STATUS_OK; + + case EPM_PROTOCOL_UNIX_DS: + epm_floor->rhs.unix_ds.path = talloc_strdup(mem_ctx, data); + NT_STATUS_HAVE_NO_MEMORY(epm_floor->rhs.unix_ds.path); + return NT_STATUS_OK; + + case EPM_PROTOCOL_NULL: + return NT_STATUS_OK; + + default: + DEBUG(0,("Unsupported lhs protocol %d\n", epm_floor->lhs.protocol)); + break; + } + + return NT_STATUS_NOT_SUPPORTED; +} + +enum dcerpc_transport_t dcerpc_transport_by_endpoint_protocol(int prot) +{ + size_t i; + + /* Find a transport that has 'prot' as 4th protocol */ + for (i=0;i<ARRAY_SIZE(transports);i++) { + if (transports[i].num_protocols >= 2 && + transports[i].protseq[1] == prot) { + return transports[i].transport; + } + } + + /* Unknown transport */ + return (unsigned int)-1; +} + +_PUBLIC_ enum dcerpc_transport_t dcerpc_transport_by_tower(const struct epm_tower *tower) +{ + size_t i; + + /* Find a transport that matches this tower */ + for (i=0;i<ARRAY_SIZE(transports);i++) { + int j; + if (transports[i].num_protocols != tower->num_floors - 2) { + continue; + } + + for (j = 0; j < transports[i].num_protocols && j < MAX_PROTSEQ; j++) { + if (transports[i].protseq[j] != tower->floors[j+2].lhs.protocol) { + break; + } + } + + if (j == transports[i].num_protocols) { + return transports[i].transport; + } + } + + /* Unknown transport */ + return (unsigned int)-1; +} + +_PUBLIC_ const char *derpc_transport_string_by_transport(enum dcerpc_transport_t t) +{ + size_t i; + + for (i=0; i<ARRAY_SIZE(transports); i++) { + if (t == transports[i].transport) { + return transports[i].name; + } + } + return NULL; +} + +_PUBLIC_ enum dcerpc_transport_t dcerpc_transport_by_name(const char *name) +{ + size_t i; + + if (name == NULL) { + return NCA_UNKNOWN; + } + + for (i=0; i<ARRAY_SIZE(transports);i++) { + if (strcasecmp(name, transports[i].name) == 0) { + return transports[i].transport; + } + } + + return NCA_UNKNOWN; +} + +_PUBLIC_ NTSTATUS dcerpc_binding_from_tower(TALLOC_CTX *mem_ctx, + struct epm_tower *tower, + struct dcerpc_binding **b_out) +{ + NTSTATUS status; + struct dcerpc_binding *b; + enum dcerpc_transport_t transport; + struct ndr_syntax_id abstract_syntax; + char *endpoint = NULL; + char *host = NULL; + + /* + * A tower needs to have at least 4 floors to carry useful + * information. Floor 3 is the transport identifier which defines + * how many floors are required at least. + */ + if (tower->num_floors < 4) { + return NT_STATUS_INVALID_PARAMETER; + } + + status = dcerpc_parse_binding(mem_ctx, "", &b); + if (!NT_STATUS_IS_OK(status)) { + return status; + } + + transport = dcerpc_transport_by_tower(tower); + if (transport == NCA_UNKNOWN) { + talloc_free(b); + return NT_STATUS_NOT_SUPPORTED; + } + + status = dcerpc_binding_set_transport(b, transport); + if (!NT_STATUS_IS_OK(status)) { + talloc_free(b); + return status; + } + + /* Set abstract syntax */ + status = dcerpc_floor_get_lhs_data(&tower->floors[0], &abstract_syntax); + if (!NT_STATUS_IS_OK(status)) { + talloc_free(b); + return status; + } + + status = dcerpc_binding_set_abstract_syntax(b, &abstract_syntax); + if (!NT_STATUS_IS_OK(status)) { + talloc_free(b); + return status; + } + + /* Ignore floor 1, it contains the NDR version info */ + + /* Set endpoint */ + errno = 0; + if (tower->num_floors >= 4) { + endpoint = dcerpc_floor_get_rhs_data(b, &tower->floors[3]); + } + if (errno != 0) { + int saved_errno = errno; + talloc_free(b); + return map_nt_error_from_unix_common(saved_errno); + } + + status = dcerpc_binding_set_string_option(b, "endpoint", endpoint); + if (!NT_STATUS_IS_OK(status)) { + talloc_free(b); + return status; + } + TALLOC_FREE(endpoint); + + /* Set network address */ + errno = 0; + if (tower->num_floors >= 5) { + host = dcerpc_floor_get_rhs_data(b, &tower->floors[4]); + } + if (errno != 0) { + int saved_errno = errno; + talloc_free(b); + return map_nt_error_from_unix_common(saved_errno); + } + + status = dcerpc_binding_set_string_option(b, "host", host); + if (!NT_STATUS_IS_OK(status)) { + talloc_free(b); + return status; + } + status = dcerpc_binding_set_string_option(b, "target_hostname", host); + if (!NT_STATUS_IS_OK(status)) { + talloc_free(b); + return status; + } + TALLOC_FREE(host); + + *b_out = b; + return NT_STATUS_OK; +} + +_PUBLIC_ struct dcerpc_binding *dcerpc_binding_dup(TALLOC_CTX *mem_ctx, + const struct dcerpc_binding *b) +{ + struct dcerpc_binding *n; + uint32_t count; + + n = talloc_zero(mem_ctx, struct dcerpc_binding); + if (n == NULL) { + return NULL; + } + + n->transport = b->transport; + n->object = b->object; + n->flags = b->flags; + n->assoc_group_id = b->assoc_group_id; + + if (b->object_string != NULL) { + n->object_string = talloc_strdup(n, b->object_string); + if (n->object_string == NULL) { + goto nomem; + } + } + if (b->host != NULL) { + n->host = talloc_strdup(n, b->host); + if (n->host == NULL) { + goto nomem; + } + } + + if (b->target_hostname != NULL) { + n->target_hostname = talloc_strdup(n, b->target_hostname); + if (n->target_hostname == NULL) { + goto nomem; + } + } + + if (b->target_principal != NULL) { + n->target_principal = talloc_strdup(n, b->target_principal); + if (n->target_principal == NULL) { + goto nomem; + } + } + + if (b->endpoint != NULL) { + n->endpoint = talloc_strdup(n, b->endpoint); + if (n->endpoint == NULL) { + goto nomem; + } + } + + for (count = 0; b->options && b->options[count]; count++); + + if (count > 0) { + uint32_t i; + + n->options = talloc_array(n, const char *, count + 1); + if (n->options == NULL) { + goto nomem; + } + + for (i = 0; i < count; i++) { + n->options[i] = talloc_strdup(n->options, b->options[i]); + if (n->options[i] == NULL) { + goto nomem; + } + } + n->options[count] = NULL; + } + + return n; +nomem: + TALLOC_FREE(n); + return NULL; +} + +_PUBLIC_ NTSTATUS dcerpc_binding_build_tower(TALLOC_CTX *mem_ctx, + const struct dcerpc_binding *binding, + struct epm_tower *tower) +{ + const enum epm_protocol *protseq = NULL; + size_t i, num_protocols = 0; + struct ndr_syntax_id abstract_syntax; + NTSTATUS status; + + /* Find transport */ + for (i=0;i<ARRAY_SIZE(transports);i++) { + if (transports[i].transport == binding->transport) { + protseq = transports[i].protseq; + num_protocols = transports[i].num_protocols; + break; + } + } + + if (i == ARRAY_SIZE(transports)) { + DEBUG(0, ("Unable to find transport with id '%d'\n", binding->transport)); + return NT_STATUS_UNSUCCESSFUL; + } + + tower->num_floors = 2 + num_protocols; + tower->floors = talloc_array(mem_ctx, struct epm_floor, tower->num_floors); + if (tower->floors == NULL) { + return NT_STATUS_NO_MEMORY; + } + + /* Floor 0 */ + tower->floors[0].lhs.protocol = EPM_PROTOCOL_UUID; + + abstract_syntax = dcerpc_binding_get_abstract_syntax(binding); + tower->floors[0].lhs.lhs_data = dcerpc_floor_pack_lhs_data(tower->floors, + &abstract_syntax); + + if (!dcerpc_floor_pack_rhs_if_version_data( + tower->floors, &abstract_syntax, + &tower->floors[0].rhs.uuid.unknown)) { + return NT_STATUS_NO_MEMORY; + } + + /* Floor 1 */ + tower->floors[1].lhs.protocol = EPM_PROTOCOL_UUID; + + tower->floors[1].lhs.lhs_data = dcerpc_floor_pack_lhs_data(tower->floors, + &ndr_transfer_syntax_ndr); + + tower->floors[1].rhs.uuid.unknown = data_blob_talloc_zero(tower->floors, 2); + + /* Floor 2 to num_protocols */ + for (i = 0; i < num_protocols; i++) { + tower->floors[2 + i].lhs.protocol = protseq[i]; + tower->floors[2 + i].lhs.lhs_data = data_blob_null; + ZERO_STRUCT(tower->floors[2 + i].rhs); + status = dcerpc_floor_set_rhs_data(tower->floors, + &tower->floors[2 + i], + NULL); + if (!NT_STATUS_IS_OK(status)) { + return status; + } + } + + /* The 4th floor contains the endpoint */ + if (num_protocols >= 2 && binding->endpoint) { + status = dcerpc_floor_set_rhs_data(tower->floors, + &tower->floors[3], + binding->endpoint); + if (!NT_STATUS_IS_OK(status)) { + return status; + } + } + + /* The 5th contains the network address */ + if (num_protocols >= 3 && binding->host) { + status = dcerpc_floor_set_rhs_data(tower->floors, + &tower->floors[4], + binding->host); + if (!NT_STATUS_IS_OK(status)) { + return status; + } + } + + return NT_STATUS_OK; +} |