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