diplodocus.org Git - nmh/blob - sbr/oauth_prof.c

   1 /* oauth_prof.c -- OAuth 2.0 implementation for XOAUTH2 in SMTP and POP3.
   2  *
   3  * This code is Copyright (c) 2014, by the authors of nmh.  See the
   4  * COPYRIGHT file in the root directory of the nmh distribution for
   5  * complete copyright information.
   6  */
   7
   8 #include <h/mh.h>
   9
  10 #ifdef OAUTH_SUPPORT
  11
  12 #include <sys/stat.h>
  13
  14 #include <stdarg.h>
  15 #include <stdio.h>
  16 #include <stdlib.h>
  17 #include <string.h>
  18 #include <strings.h>
  19 #include <unistd.h>
  20
  21 #include <h/oauth.h>
  22 #include <h/utils.h>
  23 #include "m_maildir.h"
  24
  25 static const struct mh_oauth_service_info SERVICES[] = {
  26     /* https://developers.google.com/accounts/docs/OAuth2InstalledApp */
  27     {
  28         /* name */ "gmail",
  29         /* display_name */ "Gmail",
  30
  31         /* client_id */ "91584523849-8lv9kgp1rvp8ahta6fa4b125tn2polcg.apps.googleusercontent.com",
  32         /* client_secret */ "Ua8sX34xyv7hVrKM-U70dKI6",
  33
  34         /* auth_endpoint */ "https://accounts.google.com/o/oauth2/auth",
  35         /* redirect_uri */ "urn:ietf:wg:oauth:2.0:oob",
  36         /* token_endpoint */ "https://accounts.google.com/o/oauth2/token",
  37         /* scope */ "https://mail.google.com/"
  38     }
  39 };
  40
  41 /* Copy service info so we don't have to free it only sometimes. */
  42 static void
  43 copy_svc(mh_oauth_service_info *to, const mh_oauth_service_info *from)
  44 {
  45     to->display_name = from->display_name;
  46 #define copy(_field_) to->_field_ = getcpy(from->_field_)
  47     copy(name);
  48     copy(scope);
  49     copy(client_id);
  50     copy(client_secret);
  51     copy(auth_endpoint);
  52     copy(token_endpoint);
  53     copy(redirect_uri);
  54 #undef copy
  55 }
  56
  57 /* Return profile component node name for a service parameter. */
  58 char *
  59 mh_oauth_node_name_for_svc(const char *base_name, const char *svc)
  60 {
  61     /* TODO: s/_/-/g ? */
  62     return concat("oauth-", svc, "-", base_name, NULL);
  63 }
  64
  65 /* Update one service_info field if overridden in profile. */
  66 static void
  67 update_svc_field(char **field, const char *base_name, const char *svc)
  68 {
  69     char *name = mh_oauth_node_name_for_svc(base_name, svc);
  70     const char *value = context_find(name);
  71     if (value != NULL) {
  72         free(*field);
  73         *field = mh_xstrdup(value);
  74     }
  75     free(name);
  76 }
  77
  78 /* Update all service_info fields that are overridden in profile. */
  79 static bool
  80 update_svc(mh_oauth_service_info *svc, const char *svc_name, char *errbuf,
  81            size_t errbuflen)
  82 {
  83 #define update(name)                                                    \
  84     update_svc_field(&svc->name, #name, svc_name);                       \
  85     if (svc->name == NULL) {                                             \
  86         snprintf(errbuf, errbuflen, "%s", #name " is missing");          \
  87         errbuf[errbuflen - 1] = '\0';                                    \
  88         return false;                                                    \
  89     }
  90     update(scope);
  91     update(client_id);
  92     update(client_secret);
  93     update(auth_endpoint);
  94     update(token_endpoint);
  95     update(redirect_uri);
  96 #undef update
  97
  98     if (svc->name == NULL) {
  99         svc->name = getcpy(svc_name);
 100     }
 101
 102     if (svc->display_name == NULL) {
 103         svc->display_name = svc->name;
 104     }
 105
 106     return true;
 107 }
 108
 109 bool
 110 mh_oauth_get_service_info(const char *svc_name, mh_oauth_service_info *svcinfo,
 111                           char *errbuf, size_t errbuflen)
 112 {
 113     int i;
 114
 115     svcinfo->name = svcinfo->display_name = NULL;
 116     svcinfo->scope = svcinfo->client_id = NULL;
 117     svcinfo->client_secret = svcinfo->auth_endpoint = NULL;
 118     svcinfo->token_endpoint = svcinfo->redirect_uri = NULL;
 119
 120     for (i = 0; i < (int)DIM(SERVICES); i++) {
 121         if (strcmp(SERVICES[i].name, svc_name) == 0) {
 122             copy_svc(svcinfo, &SERVICES[i]);
 123             break;
 124         }
 125     }
 126
 127     return update_svc(svcinfo, svc_name, errbuf, errbuflen);
 128 }
 129
 130 /* Return value must be free(3)'d. */
 131 char *
 132 mh_oauth_cred_fn(const char *svc)
 133 {
 134     char *key = mh_oauth_node_name_for_svc("credential-file", svc);
 135     char *value = context_find(key);
 136     free(key);
 137
 138     bool found = value;
 139     if (found) {
 140         if (*value == '/')
 141             return mh_xstrdup(value);
 142     } else
 143         value = concat("oauth-", svc, NULL);
 144
 145     const char *md = m_maildir(value);
 146     if (!found)
 147         free(value);
 148
 149     return mh_xstrdup(md);
 150 }
 151 #endif