rlm_smtp.c File Reference

smtp server authentication. More...

#include <freeradius-devel/curl/base.h>
#include <freeradius-devel/server/base.h>
#include <freeradius-devel/server/cf_priv.h>
#include <freeradius-devel/server/global_lib.h>
#include <freeradius-devel/server/module_rlm.h>
#include <freeradius-devel/server/tmpl_dcursor.h>
#include <freeradius-devel/util/slab.h>
#include <freeradius-devel/util/token.h>
#include <freeradius-devel/unlang/call_env.h>

Include dependency graph for rlm_smtp.c:

Go to the source code of this file.

Data Structures
struct	fr_mail_ctx_t
struct	rlm_smtp_auth_env_t
	Call environment for SMTP authentication. More...
struct	rlm_smtp_env_t
	Call environment for sending emails. More...
struct	rlm_smtp_t
struct	rlm_smtp_thread_t

Macros
#define	SMTP_COMMON_CLEANUP

Functions
static int	attachments_source (fr_mail_ctx_t *uctx, curl_mime *mime, rlm_smtp_t const *inst, rlm_smtp_env_t const *call_env)
static int	body_init (fr_mail_ctx_t *uctx, curl_mime *mime)
static size_t	body_source (char *ptr, size_t size, size_t nmemb, void *mail_ctx)
static int	da_to_slist (fr_mail_ctx_t *uctx, struct curl_slist **out, const fr_dict_attr_t *dict_attr)
static int	generate_from_header (fr_mail_ctx_t *uctx, struct curl_slist **out, rlm_smtp_t const *inst, rlm_smtp_env_t const *call_env)
	Generate the From: header. More...
static int	header_source (fr_mail_ctx_t *uctx, rlm_smtp_t const *inst, rlm_smtp_env_t const *call_env)
static unlang_action_t	mod_authenticate (rlm_rcode_t *p_result, module_ctx_t const *mctx, request_t *request)
static int	mod_instantiate (module_inst_ctx_t const *mctx)
static unlang_action_t	mod_mail (rlm_rcode_t *p_result, module_ctx_t const *mctx, request_t *request)
static int	mod_thread_detach (module_thread_inst_ctx_t const *mctx)
static int	mod_thread_instantiate (module_thread_inst_ctx_t const *mctx)
static int	recipients_source (fr_mail_ctx_t *uctx, rlm_smtp_env_t const *call_env)
static int	smtp_conn_common_init (fr_curl_io_request_t *randle, rlm_smtp_t const *inst)
static int	smtp_header_section_parse (TALLOC_CTX *ctx, call_env_parsed_head_t *out, tmpl_rules_t const *t_rules, CONF_ITEM *ci, UNUSED char const *section_name1, UNUSED char const *section_name2, UNUSED void const *data, UNUSED call_env_parser_t const *rule)
	Parse the header section into tmpls for producing email headers. More...
static unlang_action_t	smtp_io_module_resume (rlm_rcode_t *p_result, module_ctx_t const *mctx, request_t *request)
	Callback to process response of SMTP server. More...
static void	smtp_io_module_signal (module_ctx_t const *mctx, request_t *request, UNUSED fr_signal_t action)
static int	smtp_mail_ctx_free (fr_mail_ctx_t *mail_ctx)
static int	smtp_onetime_conn_alloc (fr_curl_io_request_t *randle, UNUSED void *uctx)
static int	smtp_onetime_conn_init (fr_curl_io_request_t *randle, void *uctx)
static int	smtp_onetime_request_cleanup (fr_curl_io_request_t *randle, UNUSED void *uctx)
static int	smtp_persist_conn_alloc (fr_curl_io_request_t *randle, UNUSED void *uctx)
static int	smtp_persist_conn_init (fr_curl_io_request_t *randle, void *uctx)
static int	smtp_persist_request_cleanup (fr_curl_io_request_t *randle, UNUSED void *uctx)
static int	str_to_attachments (fr_mail_ctx_t *uctx, curl_mime *mime, char const *str, size_t len, fr_sbuff_t *path_buffer, fr_sbuff_marker_t *m)
static int	value_box_list_to_header (fr_mail_ctx_t *uctx, struct curl_slist **out, fr_value_box_list_t const *lists, const char *prefix)
	Converts an array of value box lists to a curl_slist with a prefix. More...
static int	value_box_list_to_slist (struct curl_slist **out, fr_value_box_list_t const *lists)
	Transform an array of value box lists to entries in a CURL slist. More...

Variables
static fr_dict_attr_t const *	attr_smtp_body
static fr_dict_attr_t const *	attr_smtp_header
static const call_env_method_t	auth_env
static fr_dict_t const *	dict_freeradius
static const call_env_method_t	method_env
static const conf_parser_t	module_config []
module_rlm_t	rlm_smtp
fr_dict_autoload_t	rlm_smtp_dict []
fr_dict_attr_autoload_t	rlm_smtp_dict_attr []
global_lib_autoinst_t const *const	rlm_smtp_lib []

Detailed Description

smtp server authentication.

Id

179c78736f77a569029fe09a640fb4bd297eb4b4

Copyright

2020 The FreeRADIUS server project

2020 Network RADIUS SAS (legal.nosp@m.@net.nosp@m.workr.nosp@m.adiu.nosp@m.s.com)

Definition in file rlm_smtp.c.

---

Data Structure Documentation

fr_mail_ctx_t

struct fr_mail_ctx_t

Definition at line 136 of file rlm_smtp.c.

Collaboration diagram for fr_mail_ctx_t:

Data Fields
fr_dcursor_t	body_cursor
struct curl_slist *	body_header
fr_dcursor_t	cursor
struct curl_slist *	header
curl_mime *	mime
fr_curl_io_request_t *	randle
struct curl_slist *	recipients
request_t *	request
fr_time_t	time
char	time_str[60]
fr_dbuff_t	vp_in

rlm_smtp_auth_env_t

struct rlm_smtp_auth_env_t

Call environment for SMTP authentication.

Definition at line 79 of file rlm_smtp.c.

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Data Fields
fr_value_box_t	password	Value to use for password.
tmpl_t *	password_tmpl	tmpl expanded to populate password
fr_value_box_t	username	Value to use for user name.
tmpl_t *	username_tmpl	tmpl expanded to populate username

rlm_smtp_env_t

struct rlm_smtp_env_t

Call environment for sending emails.

Definition at line 64 of file rlm_smtp.c.

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Data Fields
fr_value_box_list_t *	attachments	List of files to attach.
fr_value_box_list_t *	bcc_addrs	The address(es) used for the Bcc: header.
fr_value_box_list_t *	cc_addrs	The address(es) used for the Cc: header.
fr_value_box_list_t	headers	Entries to add to email header.
fr_value_box_t	password	Password for authenticated mails.
fr_value_box_list_t *	recipient_addrs	The address(es) used as recipients. Overrides elements in to, cc and bcc.
fr_value_box_list_t *	sender_address	The address(es) used to generate the From: header.
fr_value_box_list_t *	to_addrs	The address(es) used for the To: header.
fr_value_box_t	username	User to authenticate as when sending emails.
tmpl_t *	username_tmpl	The tmpl used to produce the above.

rlm_smtp_t

struct rlm_smtp_t

Definition at line 86 of file rlm_smtp.c.

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Data Fields
fr_curl_conn_config_t	conn_config	Reusable CURL handle config.
char const *	envelope_address	The address used to send the message.
bool	set_date
char const *	template_dir	The directory that contains all email attachments.
fr_time_delta_t	timeout	Timeout for connection and server response.
fr_curl_tls_t	tls	Used for handled all tls specific curl components.
char const *	uri	URI of smtp server.

rlm_smtp_thread_t

struct rlm_smtp_thread_t

Definition at line 126 of file rlm_smtp.c.

Collaboration diagram for rlm_smtp_thread_t:

Data Fields
fr_curl_handle_t *	mhandle	Thread specific multi handle. Serves as the dispatch and coralling structure for smtp requests
smtp_slab_list_t *	slab_onetime	Slab list for onetime use connections.
smtp_slab_list_t *	slab_persist	Slab list for persistent connections.

Macro Definition Documentation

SMTP_COMMON_CLEANUP

#define SMTP_COMMON_CLEANUP

Value:

        fr_mail_ctx_t   *mail_ctx = talloc_get_type_abort(randle->uctx, fr_mail_ctx_t); \
        if (mail_ctx->mime) curl_mime_free(mail_ctx->mime); \
        if (mail_ctx->header) curl_slist_free_all(mail_ctx->header); \
        if (mail_ctx->recipients) curl_slist_free_all(mail_ctx->recipients)

Definition at line 782 of file rlm_smtp.c.

Function Documentation

attachments_source()

static int attachments_source ( fr_mail_ctx_t *  uctx, curl_mime *  mime, rlm_smtp_t const *  inst, rlm_smtp_env_t const *  call_env  )

static

Definition at line 510 of file rlm_smtp.c.

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body_init()

static int body_init ( fr_mail_ctx_t *  uctx, curl_mime *  mime  )

static

Definition at line 463 of file rlm_smtp.c.

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body_source()

static size_t body_source ( char *  ptr, size_t  size, size_t  nmemb, void *  mail_ctx  )

static

Definition at line 422 of file rlm_smtp.c.

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da_to_slist()

static int da_to_slist ( fr_mail_ctx_t *  uctx, struct curl_slist **  out, const fr_dict_attr_t *  dict_attr  )

static

Definition at line 155 of file rlm_smtp.c.

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generate_from_header()

static int generate_from_header ( fr_mail_ctx_t *  uctx, struct curl_slist **  out, rlm_smtp_t const *  inst, rlm_smtp_env_t const *  call_env  )

static

Generate the From: header.

Defaults to using sender_address values, falls back to envelope_address

Definition at line 296 of file rlm_smtp.c.

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header_source()

static int header_source ( fr_mail_ctx_t *  uctx, rlm_smtp_t const *  inst, rlm_smtp_env_t const *  call_env  )

static

Definition at line 371 of file rlm_smtp.c.

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mod_authenticate()

static unlang_action_t mod_authenticate ( rlm_rcode_t *  p_result, module_ctx_t const *  mctx, request_t *  request  )

static

Definition at line 743 of file rlm_smtp.c.

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mod_instantiate()

static int mod_instantiate ( module_inst_ctx_t const *  mctx )

static

Definition at line 772 of file rlm_smtp.c.

mod_mail()

static unlang_action_t mod_mail ( rlm_rcode_t *  p_result, module_ctx_t const *  mctx, request_t *  request  )

static

Definition at line 627 of file rlm_smtp.c.

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mod_thread_detach()

static int mod_thread_detach ( module_thread_inst_ctx_t const *  mctx )

static

Definition at line 926 of file rlm_smtp.c.

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mod_thread_instantiate()

static int mod_thread_instantiate ( module_thread_inst_ctx_t const *  mctx )

static

Definition at line 897 of file rlm_smtp.c.

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recipients_source()

static int recipients_source ( fr_mail_ctx_t *  uctx, rlm_smtp_env_t const *  call_env  )

static

Definition at line 328 of file rlm_smtp.c.

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smtp_conn_common_init()

static int smtp_conn_common_init ( fr_curl_io_request_t *  randle, rlm_smtp_t const *  inst  )

inlinestatic

Definition at line 844 of file rlm_smtp.c.

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smtp_header_section_parse()

static int smtp_header_section_parse ( TALLOC_CTX *  ctx, call_env_parsed_head_t *  out, tmpl_rules_t const *  t_rules, CONF_ITEM *  ci, UNUSED char const *  section_name1, UNUSED char const *  section_name2, UNUSED void const *  data, UNUSED call_env_parser_t const *  rule  )

static

Parse the header section into tmpls for producing email headers.

Definition at line 939 of file rlm_smtp.c.

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smtp_io_module_resume()

static unlang_action_t smtp_io_module_resume ( rlm_rcode_t *  p_result, module_ctx_t const *  mctx, request_t *  request  )

static

Callback to process response of SMTP server.

It checks if the response was CURLE_OK If it was, it tries to extract the certificate attributes If the response was not OK, we REJECT the request When responding to requests initiated by mod_authenticate this is simply a check on the username and password. When responding to requests initiated by mod_mail this indicates the mail has been queued.

Definition at line 580 of file rlm_smtp.c.

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smtp_io_module_signal()

static void smtp_io_module_signal ( module_ctx_t const *  mctx, request_t *  request, UNUSED fr_signal_t  action  )

static

Definition at line 553 of file rlm_smtp.c.

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smtp_mail_ctx_free()

static int smtp_mail_ctx_free ( fr_mail_ctx_t *  mail_ctx )

static

Definition at line 818 of file rlm_smtp.c.

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smtp_onetime_conn_alloc()

static int smtp_onetime_conn_alloc ( fr_curl_io_request_t *  randle, UNUSED void *  uctx  )

static

Definition at line 806 of file rlm_smtp.c.

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smtp_onetime_conn_init()

static int smtp_onetime_conn_init ( fr_curl_io_request_t *  randle, void *  uctx  )

static

Definition at line 867 of file rlm_smtp.c.

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smtp_onetime_request_cleanup()

static int smtp_onetime_request_cleanup ( fr_curl_io_request_t *  randle, UNUSED void *  uctx  )

static

Definition at line 788 of file rlm_smtp.c.

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smtp_persist_conn_alloc()

static int smtp_persist_conn_alloc ( fr_curl_io_request_t *  randle, UNUSED void *  uctx  )

static

Definition at line 825 of file rlm_smtp.c.

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smtp_persist_conn_init()

static int smtp_persist_conn_init ( fr_curl_io_request_t *  randle, void *  uctx  )

static

Definition at line 884 of file rlm_smtp.c.

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smtp_persist_request_cleanup()

static int smtp_persist_request_cleanup ( fr_curl_io_request_t *  randle, UNUSED void *  uctx  )

static

Definition at line 797 of file rlm_smtp.c.

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str_to_attachments()

static int str_to_attachments ( fr_mail_ctx_t *  uctx, curl_mime *  mime, char const *  str, size_t  len, fr_sbuff_t *  path_buffer, fr_sbuff_marker_t *  m  )

static

Definition at line 253 of file rlm_smtp.c.

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value_box_list_to_header()

static int value_box_list_to_header ( fr_mail_ctx_t *  uctx, struct curl_slist **  out, fr_value_box_list_t const *  lists, const char *  prefix  )

static

Converts an array of value box lists to a curl_slist with a prefix.

Parameters

uctx	Mail context.
out	CURL slist to write to.
list	of value boxes to copy.
prefix	to prepend to the output slist

Returns

• 1 on success
• 0 if no slist entry was created
• -1 on failure

Definition at line 207 of file rlm_smtp.c.

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value_box_list_to_slist()

static int value_box_list_to_slist ( struct curl_slist **  out, fr_value_box_list_t const *  lists  )

static

Transform an array of value box lists to entries in a CURL slist.

Definition at line 178 of file rlm_smtp.c.

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Variable Documentation

attr_smtp_body

fr_dict_attr_t const* attr_smtp_body

static

Definition at line 47 of file rlm_smtp.c.

attr_smtp_header

fr_dict_attr_t const* attr_smtp_header

static

Definition at line 46 of file rlm_smtp.c.

auth_env

const call_env_method_t auth_env

static

Initial value:

= {
        FR_CALL_ENV_METHOD_OUT(rlm_smtp_auth_env_t),
        .env = (call_env_parser_t[]) {
                { FR_CALL_ENV_PARSE_OFFSET("username_attribute", FR_TYPE_STRING,
                                           CALL_ENV_FLAG_ATTRIBUTE | CALL_ENV_FLAG_REQUIRED | CALL_ENV_FLAG_CONCAT | CALL_ENV_FLAG_NULLABLE,
                                           rlm_smtp_auth_env_t, username, username_tmpl), .pair.dflt = "&User-Name", .pair.dflt_quote = T_BARE_WORD },
                { FR_CALL_ENV_PARSE_OFFSET("password_attribute", FR_TYPE_STRING,
                                           CALL_ENV_FLAG_ATTRIBUTE | CALL_ENV_FLAG_REQUIRED | CALL_ENV_FLAG_CONCAT | CALL_ENV_FLAG_NULLABLE | CALL_ENV_FLAG_SECRET,
                                           rlm_smtp_auth_env_t, password, password_tmpl), .pair.dflt = "&User-Password", .pair.dflt_quote = T_BARE_WORD },
                CALL_ENV_TERMINATOR
        }
}

Definition at line 1014 of file rlm_smtp.c.

dict_freeradius

fr_dict_t const* dict_freeradius

static

Definition at line 38 of file rlm_smtp.c.

method_env

const call_env_method_t method_env

static

Initial value:

= {
        FR_CALL_ENV_METHOD_OUT(rlm_smtp_env_t),
        .env = (call_env_parser_t[]) {
                { FR_CALL_ENV_PARSE_OFFSET("username", FR_TYPE_STRING, CALL_ENV_FLAG_NULLABLE | CALL_ENV_FLAG_CONCAT, rlm_smtp_env_t, username, username_tmpl),
                                          .pair.dflt_quote = T_DOUBLE_QUOTED_STRING },
                { FR_CALL_ENV_OFFSET("password", FR_TYPE_STRING, CALL_ENV_FLAG_NULLABLE | CALL_ENV_FLAG_CONCAT, rlm_smtp_env_t, password), .pair.dflt_quote = T_DOUBLE_QUOTED_STRING },
                { FR_CALL_ENV_OFFSET("sender_address", FR_TYPE_STRING, CALL_ENV_FLAG_NONE, rlm_smtp_env_t, sender_address) },
                { FR_CALL_ENV_OFFSET("recipients", FR_TYPE_STRING, CALL_ENV_FLAG_NULLABLE, rlm_smtp_env_t, recipient_addrs),
                                     .pair.dflt = "&SMTP-Recipients[*]", .pair.dflt_quote = T_BARE_WORD },
                { FR_CALL_ENV_OFFSET("TO", FR_TYPE_STRING, CALL_ENV_FLAG_NULLABLE, rlm_smtp_env_t, to_addrs),
                                    .pair.dflt = "&SMTP-TO[*]", .pair.dflt_quote = T_BARE_WORD },
                { FR_CALL_ENV_OFFSET("CC", FR_TYPE_STRING, CALL_ENV_FLAG_NULLABLE, rlm_smtp_env_t, cc_addrs),
                                    .pair.dflt = "&SMTP-CC[*]", .pair.dflt_quote = T_BARE_WORD },
                { FR_CALL_ENV_OFFSET("BCC", FR_TYPE_STRING, CALL_ENV_FLAG_NULLABLE, rlm_smtp_env_t, bcc_addrs),
                                    .pair.dflt = "&SMTP-BCC[*]", .pair.dflt_quote = T_BARE_WORD },
                { FR_CALL_ENV_OFFSET("attachments", FR_TYPE_STRING, CALL_ENV_FLAG_NULLABLE, rlm_smtp_env_t, attachments),
                                    .pair.dflt = "&SMTP-Attachments[*]", .pair.dflt_quote = T_BARE_WORD },
                { FR_CALL_ENV_SUBSECTION_FUNC("header", CF_IDENT_ANY, CALL_ENV_FLAG_SUBSECTION, smtp_header_section_parse) },
 
                CALL_ENV_TERMINATOR
        }
}

Definition at line 991 of file rlm_smtp.c.

module_config

const conf_parser_t module_config[]

static

Initial value:

= {
        { FR_CONF_OFFSET("uri", rlm_smtp_t, uri) },
        { FR_CONF_OFFSET("template_directory", rlm_smtp_t, template_dir) },
        { FR_CONF_OFFSET("envelope_address", rlm_smtp_t, envelope_address) },
        { FR_CONF_OFFSET("timeout", rlm_smtp_t, timeout) },
        { FR_CONF_OFFSET("set_date", rlm_smtp_t, set_date), .dflt = "yes" },
        { FR_CONF_OFFSET_SUBSECTION("tls", 0, rlm_smtp_t, tls, fr_curl_tls_config) },
        { FR_CONF_OFFSET_SUBSECTION("connection", 0, rlm_smtp_t, conn_config, fr_curl_conn_config) },
        CONF_PARSER_TERMINATOR
}

Definition at line 102 of file rlm_smtp.c.

rlm_smtp

module_rlm_t rlm_smtp

Initial value:

= {
        .common = {
                .magic                  = MODULE_MAGIC_INIT,
                .name                   = "smtp",
                .flags                  = MODULE_TYPE_THREAD_SAFE,
                .inst_size              = sizeof(rlm_smtp_t),
                .thread_inst_size       = sizeof(rlm_smtp_thread_t),
                .config                 = module_config,
                .instantiate            = mod_instantiate,
                .thread_instantiate     = mod_thread_instantiate,
                .thread_detach          = mod_thread_detach,
        },
        .method_names = (module_method_name_t[]){
                { .name1 = "mail",              .name2 = CF_IDENT_ANY,          .method = mod_mail,
                  .method_env = &method_env },
                { .name1 = "authenticate",      .name2 = CF_IDENT_ANY,          .method = mod_authenticate,
                  .method_env = &auth_env },
                MODULE_NAME_TERMINATOR
        }
}

Definition at line 1037 of file rlm_smtp.c.

rlm_smtp_dict

fr_dict_autoload_t rlm_smtp_dict

Initial value:

= {
        { .out = &dict_freeradius, .proto = "freeradius"},
        { NULL }
}

Definition at line 41 of file rlm_smtp.c.

rlm_smtp_dict_attr

fr_dict_attr_autoload_t rlm_smtp_dict_attr

Initial value:

= {
        { .out = &attr_smtp_header, .name = "SMTP-Mail-Header", .type = FR_TYPE_STRING, .dict = &dict_freeradius },
        { .out = &attr_smtp_body, .name = "SMTP-Mail-Body", .type = FR_TYPE_STRING, .dict = &dict_freeradius },
        { NULL },
}

Definition at line 50 of file rlm_smtp.c.

rlm_smtp_lib

global_lib_autoinst_t const *const rlm_smtp_lib

Initial value:

= {
        &fr_curl_autoinst,
        GLOBAL_LIB_TERMINATOR
}

Definition at line 57 of file rlm_smtp.c.